This is the ECMWF model's output only
You're viewing raw atmospheric data from the ECMWF (European Centre for Medium-Range Weather Forecasts (IFS)). This is just one model's interpretation and it may disagree with the other models.
Our AI uses this data (along with other models) to create the final forecast. Don't treat this as the definitive answer.
View the Synthesized Forecast InsteadSizzling Heat with Scattered Eastern Showers
Kentucky is in for a very hot day on September 3rd. Most of the state will see sunshine and temperatures climbing into the mid-to-upper 90s. With the humidity, it will feel even hotter, so please take precautions if you are working or spending time outdoors.
In the afternoon, folks in Northern Kentucky and the Bluegrass regions might see a few clouds build up and a passing rain shower. However, these will be hit-or-miss and won't offer much relief from the heat for most people. Western Kentucky will remain dry and sunny throughout the day.
Regional Conditions
PURCHASE
NORTHWEST PENNYRILE
SOUTHWEST PENNYRILE
BARREN RIVER
LOUISVILLE METRO
LINCOLN TRAIL
LAKE CUMBERLAND
NORTHERN KY
BLUEGRASS CORE
BLUEGRASS FOOTHILLS
NORTHEAST KY
SOUTHEAST COALFIELDS
Technical Analyses
To generate the forecast, our AI system analyzed multiple atmospheric layers and variables from the ECMWF model. Each chart below represents a different aspect of the atmosphere—from the jet stream at 30,000 feet down to surface conditions—providing crucial pieces of the weather puzzle.
The AI model extracted key meteorological features from each analysis, identified patterns and conflicts between different atmospheric levels, and synthesized this information into a coherent forecast. For example, surface temperatures might suggest snow, but upper-level warmth could mean rain instead. The model weighs these factors to determine the most likely outcome based on historical precedent.
Below you'll find detailed breakdowns of each atmospheric analysis that contributed to the forecast, including what the model shows and how it influences Kentucky's weather.
Thermodynamics
How temperature changes with altitude. This determines whether precipitation falls as rain, snow, sleet, or freezing rain based on the vertical temperature profile.
A robust deep-layer ridge (594dm) is producing significant subsidence across the state. Inverted-V soundings characterize the lower levels (900-700mb) in central and eastern regions, indicating steep lapse rates but high LCLs.
Freezing line is well north in Canada; thermal boundary is non-existent as the state is bathed in a uniform air mass.
Purely diurnal solar heating driving T-max values into the 90s across all 12 regions.
Kinematics
Wind patterns and atmospheric energy. Frontal passages, jet stream positioning, and vorticity tell us where and when lift will generate precipitation.
No frontal passage. Surface winds are light and variable reflecting the broad high-pressure center.
Jet stream is retired north of 50N, leaving KY in a region of weak anticyclonic flow and little to no kinematic support for storm organization.
Small vorticity lobes are detectable on the periphery of the ridge, specifically affecting Northern and Northeastern KY in the late afternoon.
Hydrology
Moisture content and precipitation character. This reveals whether the atmosphere is saturated enough to produce precipitation, and what type to expect (steady vs. bursts).
Column is largely dry. Saturated layers exist only in the 700-600mb layer in the east, posing a significant Virga risk as precipitation falls into a 30F+ dewpoint depression at the surface.
Primarily convective/showery where it occurs, but with very low liquid efficiency (Stratiform appearance on radar but convective in origin).
Hydrologic conditions are stable; no flooding risk due to negligible liquid totals.
Sultry Conditions with Scattered Light Showers
Kentucky is in for a very warm and humid day. Most of the state will see temperatures climbing into the 90s, with the Purchase area nearing 100 degrees before some light rain arrives in the afternoon.
Expect scattered rain showers to develop throughout the morning and afternoon. These showers will be light and won't provide much relief from the heat, making for a muggy second half of the day. No severe weather or significant accumulation is expected.
Regional Conditions
PURCHASE
NORTHWEST PENNYRILE
SOUTHWEST PENNYRILE
BARREN RIVER
LOUISVILLE METRO
LINCOLN TRAIL
LAKE CUMBERLAND
NORTHERN KY
BLUEGRASS CORE
BLUEGRASS FOOTHILLS
NORTHEAST KY
SOUTHEAST COALFIELDS
Technical Analyses
To generate the forecast, our AI system analyzed multiple atmospheric layers and variables from the ECMWF model. Each chart below represents a different aspect of the atmosphere—from the jet stream at 30,000 feet down to surface conditions—providing crucial pieces of the weather puzzle.
The AI model extracted key meteorological features from each analysis, identified patterns and conflicts between different atmospheric levels, and synthesized this information into a coherent forecast. For example, surface temperatures might suggest snow, but upper-level warmth could mean rain instead. The model weighs these factors to determine the most likely outcome based on historical precedent.
Below you'll find detailed breakdowns of each atmospheric analysis that contributed to the forecast, including what the model shows and how it influences Kentucky's weather.
Thermodynamics
How temperature changes with altitude. This determines whether precipitation falls as rain, snow, sleet, or freezing rain based on the vertical temperature profile.
A warm-core regime with nearly adiabatic lapse rates in the lower levels. No significant inversions are expected despite high humidity.
A weak, diffuse surface trough is stalled across the Ohio River valley, serving as the focus for moisture convergence.
Standard diurnal heating curve, though somewhat flattened in the east (Northern/Northeast/Southeast KY) due to high cloud cover and 80% PoP.
Kinematics
Wind patterns and atmospheric energy. Frontal passages, jet stream positioning, and vorticity tell us where and when lift will generate precipitation.
No distinct frontal passage occurred; wind shifts are negligible and reflect local convective influences rather than synoptic changes.
Moderate westerly flow aloft (approx 60-70kts) provides general synoptic support, but lacks the divergence required for significant organized convection.
Broad cyclonic flow aloft with no discrete shortwaves or vorticity maxima to organize precipitation.
Hydrology
Moisture content and precipitation character. This reveals whether the atmosphere is saturated enough to produce precipitation, and what type to expect (steady vs. bursts).
The atmospheric column is saturated in the 850-700mb layer across the state. In Western KY, surface dewpoint depressions of 15-20F suggest some initial virga risk.
Precipitation is primarily stratiform in nature, characterized by drizzle and very light rain showers, with little convective vigor given the CAPE value of 0.
Hydrologic threat is nonexistent; QPF totals are under 0.10" and the antecedent ground conditions are within normal limits.
Humid and Damp Saturday with Widespread Showers
Keep the umbrellas handy this Saturday as a wave of moisture moves across Kentucky. We are looking at a very high chance of rain for everyone, though it won't be a washout the entire time. Instead, expect periods of light to moderate rain showers throughout the morning and afternoon.
Temperatures will remain quite warm and muggy, with highs reaching the 80s for most, and even the low 90s in the far western parts of the state near Paducah. Despite the rain, it will feel very humid, so outdoor activities may feel uncomfortable even when it isn't raining.
Regional Conditions
PURCHASE
NORTHWEST PENNYRILE
SOUTHWEST PENNYRILE
BARREN RIVER
LOUISVILLE METRO
LINCOLN TRAIL
LAKE CUMBERLAND
NORTHERN KY
BLUEGRASS CORE
BLUEGRASS FOOTHILLS
NORTHEAST KY
SOUTHEAST COALFIELDS
Technical Analyses
To generate the forecast, our AI system analyzed multiple atmospheric layers and variables from the ECMWF model. Each chart below represents a different aspect of the atmosphere—from the jet stream at 30,000 feet down to surface conditions—providing crucial pieces of the weather puzzle.
The AI model extracted key meteorological features from each analysis, identified patterns and conflicts between different atmospheric levels, and synthesized this information into a coherent forecast. For example, surface temperatures might suggest snow, but upper-level warmth could mean rain instead. The model weighs these factors to determine the most likely outcome based on historical precedent.
Below you'll find detailed breakdowns of each atmospheric analysis that contributed to the forecast, including what the model shows and how it influences Kentucky's weather.
Thermodynamics
How temperature changes with altitude. This determines whether precipitation falls as rain, snow, sleet, or freezing rain based on the vertical temperature profile.
The vertical temperature stack is characterized by a deep, nearly saturated moist adiabatic lapse rate from the surface through 500mb. No inversions are present.
The freezing line is located well above the flight level (14,000ft+), ensuring 100% liquid precipitation.
The diurnal curve is heavily dampened by persistent cloud cover (70-90% in most regions), leading to narrow temperature spreads between highs and lows.
Kinematics
Wind patterns and atmospheric energy. Frontal passages, jet stream positioning, and vorticity tell us where and when lift will generate precipitation.
No distinct frontal passage is observed; the system is driven by a series of weak mid-level shortwaves and broad cyclonic flow.
Moderate upper-level jet support (70-90kts) is providing broad synoptic lift, though it lacks the focused divergence needed for severe weather.
A broad cyclonic flow is in place, with very low vorticity values indicating a lack of organized lifting centers.
Hydrology
Moisture content and precipitation character. This reveals whether the atmosphere is saturated enough to produce precipitation, and what type to expect (steady vs. bursts).
The atmospheric column is highly saturated with low dewpoint depressions (<5F), meaning the risk of virga is negligible.
Precipitation will be primarily stratiform (steady/wide) in nature, with minor convective enhancement possible in the warmer western regions.
Hydrologic risk is minimal; while ground moisture is high, rainfall rates will not exceed 0.10"/hour, precluding flash flood concerns.
Isolated Morning Drizzle Followed by Afternoon Sun
Residents can expect a warm and relatively quiet day across Kentucky. While some areas in the central and eastern parts of the state may see a few light rain showers or drizzle during the morning commute, these will be very brief and won't require much more than a light jacket or a quick use of the windshield wipers.
By the afternoon, any lingering clouds will break apart, allowing for plenty of sunshine. Temperatures will remain quite warm for early September, with afternoon highs climbing into the 80s for most, and even the low 90s in the far west. It will be a great day for outdoor activities once the morning dampness clears out.
Regional Conditions
PURCHASE
NORTHWEST PENNYRILE
SOUTHWEST PENNYRILE
BARREN RIVER
LOUISVILLE METRO
LINCOLN TRAIL
LAKE CUMBERLAND
NORTHERN KY
BLUEGRASS CORE
BLUEGRASS FOOTHILLS
NORTHEAST KY
SOUTHEAST COALFIELDS
Technical Analyses
To generate the forecast, our AI system analyzed multiple atmospheric layers and variables from the ECMWF model. Each chart below represents a different aspect of the atmosphere—from the jet stream at 30,000 feet down to surface conditions—providing crucial pieces of the weather puzzle.
The AI model extracted key meteorological features from each analysis, identified patterns and conflicts between different atmospheric levels, and synthesized this information into a coherent forecast. For example, surface temperatures might suggest snow, but upper-level warmth could mean rain instead. The model weighs these factors to determine the most likely outcome based on historical precedent.
Below you'll find detailed breakdowns of each atmospheric analysis that contributed to the forecast, including what the model shows and how it influences Kentucky's weather.
Thermodynamics
How temperature changes with altitude. This determines whether precipitation falls as rain, snow, sleet, or freezing rain based on the vertical temperature profile.
The vertical temperature stack shows a well-mixed boundary layer up to 800mb across the west, with a shallow moist isothermal layer in the central and eastern regions. There is no evidence of a 'Warm Nose' or freezing layers as temperatures remain well above 60F through the entire column below 10,000 feet.
A diffuse and decaying thermal boundary is currently stalled over the Inner Bluegrass, extending southwest towards the Barren River area.
Standard diurnal curves are expected. No non-diurnal temperature drops are forecast as the boundary lacks the cold air mass required for such a trend.
Kinematics
Wind patterns and atmospheric energy. Frontal passages, jet stream positioning, and vorticity tell us where and when lift will generate precipitation.
A weak surface wind shift from south-southwest to west is expected between 12z and 18z, marking the passage of the diffuse boundary. Magnitude is low (<5mph shift).
The jet stream is located well to the north over the Great Lakes region, providing no significant divergence or lift for the Commonwealth.
Vorticity fields are largely neutral. A very compact, weak shortwave may pivot through the Ohio Valley but will lack the moisture to produce more than clouds.
Hydrology
Moisture content and precipitation character. This reveals whether the atmosphere is saturated enough to produce precipitation, and what type to expect (steady vs. bursts).
The atmospheric column is 'bottom-heavy' with moisture. Surface to 850mb is near saturation in the east, while the 700-500mb layer is very dry (RH < 20%). Large dew point depressions aloft suggest a 'Virga' risk where raindrops evaporate before hitting the ground.
Precipitation will be strictly stratiform, primarily in the form of light drizzle or intermittent light rain. No convective elements are expected given CAPE values of 0 J/kg.
The ground is currently at normal saturation levels for September. With rainfall totals capped at 0.03 inches, there is zero risk of hydrologic issues or training storms.
Sun and Summer Warmth; Light Showers East
Kentucky will experience a beautiful, warm day on September 7th. Most of the state can expect wall-to-wall sunshine with temperatures climbing into the mid-to-upper 80s by the afternoon. It will feel like a classic late-summer day, perfect for outdoor activities, though you will want to keep the sunscreen handy.
If you are in the Southeast Coalfields near Hazard or Pikeville, your day will be a bit cloudier. While we are expecting some light rain and sprinkles, it won't be a washout. Most of the rain will be very light and intermittent, occurring mainly during the morning and early afternoon hours before clearing out for a pleasant evening.
Regional Conditions
PURCHASE
NORTHWEST PENNYRILE
SOUTHWEST PENNYRILE
BARREN RIVER
LOUISVILLE METRO
LINCOLN TRAIL
LAKE CUMBERLAND
NORTHERN KY
BLUEGRASS CORE
BLUEGRASS FOOTHILLS
NORTHEAST KY
SOUTHEAST COALFIELDS
Technical Analyses
To generate the forecast, our AI system analyzed multiple atmospheric layers and variables from the ECMWF model. Each chart below represents a different aspect of the atmosphere—from the jet stream at 30,000 feet down to surface conditions—providing crucial pieces of the weather puzzle.
The AI model extracted key meteorological features from each analysis, identified patterns and conflicts between different atmospheric levels, and synthesized this information into a coherent forecast. For example, surface temperatures might suggest snow, but upper-level warmth could mean rain instead. The model weighs these factors to determine the most likely outcome based on historical precedent.
Below you'll find detailed breakdowns of each atmospheric analysis that contributed to the forecast, including what the model shows and how it influences Kentucky's weather.
Thermodynamics
How temperature changes with altitude. This determines whether precipitation falls as rain, snow, sleet, or freezing rain based on the vertical temperature profile.
The vertical temperature stack is characterized by a warm, stable boundary layer with standard adiabatic lapse rates above. No significant capping inversions are noted except for a shallow moisture trap in the Southeast Coalfields.
A weak moisture boundary is stalled along the eastern foothills of the Appalachians.
Diurnal curves will be standard across the state, with high temperatures reached late in the afternoon.
Kinematics
Wind patterns and atmospheric energy. Frontal passages, jet stream positioning, and vorticity tell us where and when lift will generate precipitation.
No frontal passage detected. High pressure is in control.
The jet stream is zonal and centered to the north, providing no dynamic lift for the region.
Broad cyclonic flow remains well to the north; Kentucky sits in a region of neutral to negative vorticity.
Hydrology
Moisture content and precipitation character. This reveals whether the atmosphere is saturated enough to produce precipitation, and what type to expect (steady vs. bursts).
The column is predominantly dry (PWAT < 1.0 inch) across the central and west. The SE Coalfields show saturation only in the 1000-850mb layer. Virga is expected in areas where radar returns appear over the Bluegrass.
Stratiform drizzle in the SE Coalfields; otherwise non-precipitating.
Hydrologic conditions are stable with high evapotranspiration rates and no heavy rainfall forecast.
Humid and Warm with Southern Showers
Kentucky will experience a split weather pattern for the upcoming Tuesday. Those in the northern and western parts of the state can expect a mix of sun and clouds with high temperatures climbing into the upper 80s and low 90s. No rain is expected for cities like Paducah, Owensboro, and Louisville.
Further south and east, including the Lake Cumberland and Southeast Coalfields regions, humidity will be higher and lead to scattered light rain and drizzle. These showers will not be heavy or stormy, but may be enough to necessitate intermittent windshield wiper use throughout the morning and early afternoon. Skies will begin to clear across the entire state by late evening.
Regional Conditions
PURCHASE
NORTHWEST PENNYRILE
SOUTHWEST PENNYRILE
BARREN RIVER
LOUISVILLE METRO
LINCOLN TRAIL
LAKE CUMBERLAND
NORTHERN KY
BLUEGRASS CORE
BLUEGRASS FOOTHILLS
NORTHEAST KY
SOUTHEAST COALFIELDS
Technical Analyses
To generate the forecast, our AI system analyzed multiple atmospheric layers and variables from the ECMWF model. Each chart below represents a different aspect of the atmosphere—from the jet stream at 30,000 feet down to surface conditions—providing crucial pieces of the weather puzzle.
The AI model extracted key meteorological features from each analysis, identified patterns and conflicts between different atmospheric levels, and synthesized this information into a coherent forecast. For example, surface temperatures might suggest snow, but upper-level warmth could mean rain instead. The model weighs these factors to determine the most likely outcome based on historical precedent.
Below you'll find detailed breakdowns of each atmospheric analysis that contributed to the forecast, including what the model shows and how it influences Kentucky's weather.
Thermodynamics
How temperature changes with altitude. This determines whether precipitation falls as rain, snow, sleet, or freezing rain based on the vertical temperature profile.
The vertical temperature stack reveals a classic late-summer profile with warm surface temperatures in the 80s and 90s. No low-level inversions are present except for minor overnight radiation cooling in eastern valleys.
Freezing level remains exceptionally high (near 14,000 ft), with the only meaningful moisture boundary located along the TN/KY border where dew points exceed 70°F.
Standard diurnal curve with temperatures peaking between 3:00 PM and 5:00 PM local time.
Kinematics
Wind patterns and atmospheric energy. Frontal passages, jet stream positioning, and vorticity tell us where and when lift will generate precipitation.
None; Kentucky remains in a broad, poorly defined warm sector with no frontal features within 300 miles.
Moderate 250mb zonal flow (approx 60-80kts) provides minimal synoptic lift as Kentucky sits in a region of neutral divergence.
Broad cyclonic flow persists, but no compact shortwave troughs or vorticity maxima are noted in the guidance.
Hydrology
Moisture content and precipitation character. This reveals whether the atmosphere is saturated enough to produce precipitation, and what type to expect (steady vs. bursts).
The lower 2,000 feet of the atmosphere are near saturation (90%+) in the south and east, while the northern half of the state remains drier with surface dew point depressions of 15°F or greater.
Exclusively stratiform light rain or drizzle. The lack of CAPE (0 J/kg) prevents any convective bursts or lightning.
No hydrologic concerns given the extremely low liquid totals (all regions < 0.05 inches).
Late Summer Heat West, Nuisance Sprinkles East
It will be a hot and dry day for most of Western Kentucky, with temperatures climbing into the mid-90s. If you are in Paducah or Owensboro, expect plenty of sunshine and high humidity.
For those in Lexington, Ashland, and the mountain regions, the day will feel much cooler due to cloud cover and frequent light rain. While it will rain for much of the morning, the actual amount of water will be very low—mostly just enough to dampen the pavement and require windshield wipers.
Regional Conditions
PURCHASE
NORTHWEST PENNYRILE
SOUTHWEST PENNYRILE
BARREN RIVER
LOUISVILLE METRO
LINCOLN TRAIL
LAKE CUMBERLAND
NORTHERN KY
BLUEGRASS CORE
BLUEGRASS FOOTHILLS
NORTHEAST KY
SOUTHEAST COALFIELDS
Technical Analyses
To generate the forecast, our AI system analyzed multiple atmospheric layers and variables from the ECMWF model. Each chart below represents a different aspect of the atmosphere—from the jet stream at 30,000 feet down to surface conditions—providing crucial pieces of the weather puzzle.
The AI model extracted key meteorological features from each analysis, identified patterns and conflicts between different atmospheric levels, and synthesized this information into a coherent forecast. For example, surface temperatures might suggest snow, but upper-level warmth could mean rain instead. The model weighs these factors to determine the most likely outcome based on historical precedent.
Below you'll find detailed breakdowns of each atmospheric analysis that contributed to the forecast, including what the model shows and how it influences Kentucky's weather.
Thermodynamics
How temperature changes with altitude. This determines whether precipitation falls as rain, snow, sleet, or freezing rain based on the vertical temperature profile.
The atmosphere across Kentucky features a standard adiabatic lapse rate with no significant inversions. A large temperature spread exists in the west, while the east is nearly saturated in the lower levels.
The thermal boundary (freezing line) is located well above 15,000 ft, far above the weather-producing layer.
Diurnal heating will be the primary driver of temperature, with peaks occurring around 16:00 local time. Cloud cover in the east will suppress these peaks slightly compared to the west.
Kinematics
Wind patterns and atmospheric energy. Frontal passages, jet stream positioning, and vorticity tell us where and when lift will generate precipitation.
No frontal passage is observed. The state is under the influence of stagnant airmass boundaries.
Moderate zonal flow is present in the upper atmosphere, but significant lift is lacking due to a lack of jet-streak divergence.
A very weak, compact shortwave trough is pivoting through the Ohio Valley, primarily impacting the Northeast region.
Hydrology
Moisture content and precipitation character. This reveals whether the atmosphere is saturated enough to produce precipitation, and what type to expect (steady vs. bursts).
A sharp contrast exists: the western half of the state is very dry (virga risk high), while the eastern half is saturated from the surface to 700mb.
Precipitation will be purely stratiform in nature, characterized by light rain and drizzle without convective elements.
Hydrologic conditions are stable. No flooding is anticipated given the extremely low liquid totals.