This is the GFS model's output only
You're viewing raw atmospheric data from the GFS (Global Forecast System). 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 InsteadIntense Heat Grips Kentucky with Isolated Showers East
Drink plenty of water and stay in the shade. Today will be one of the hottest days of the year, with temperatures hitting the 100-degree mark in many western and central Kentucky towns. Even the cooler mountain regions will see mid-90s.
While most of the state stays dry and sunny, folks in the Lexington and Ashland areas might see a few light rain showers, especially in the evening. These won't provide much relief from the heat, but they could briefly cloud the sky. High humidity will make it feel even hotter than the thermometer shows.
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 GFS 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 profile across Kentucky is characterized by an expansive warm-core ridge. Surface temperatures of 35-38C are supported by 850mb temperatures of 24-26C. No significant inversions are present except for localized nocturnal radiational cooling in the eastern valleys.
The 0C isotherm (freezing line) is located well north of the Canadian border, with the local freezing level exceeding 14,500 feet MSL.
Highly diurnal. Rapid insolation following sunrise will lead to 3-5 degree hourly temperature jumps between 14z and 18z. Overnight lows will be tempered by high dewpoints in the low 70s.
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 expected. The region is under a stagnant, high-pressure regime. Surface winds are light and variable.
The polar jet is retreated into central Canada. A weak subtropical jet streak is noted across the Gulf Coast, providing no dynamical lift for Kentucky.
A weak shortwave trough is rotating around the eastern periphery of the ridge. While it carries moderate vorticity (max 0.00012 in the NE), the lack of instability (0 J/kg CAPE) and deep-layer moisture will limit output to light stratiform rain.
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 largely undersaturated. Significant dewpoint depressions (25-35F) exist in the boundary layer across western KY. In the east, mid-level saturation (700-500mb) will lead to virga and light rain.
Precipitation will be purely stratiform and light. Rain drop size is expected to be small due to entrainment of dry air.
Soil moisture is declining due to the heatwave. No hydrologic threats are present.
Severe & Instability
Storm organization potential. This examines atmospheric instability (CAPE) and wind shear to determine if conditions favor severe thunderstorms, and what hazards to expect.
Deep-layer shear is less than 10 knots. No storm organization is possible.
Despite the high heat, the GFS models 0 CAPE due to a significant mid-level cap and lack of low-level moisture convergence.
Heat exhaustion is the primary physical threat today.
Triple-Digit Heat Grips Kentucky as Record Temperatures Loom
Prepare for a day of dangerous heat across Kentucky. Most areas will see temperatures soar into the upper 90s, with Louisville and Western Kentucky likely hitting or exceeding the 100-degree mark. Skies will stay mostly clear and sunny for the western half of the state.
In the eastern and northern parts of Kentucky, there is a small chance for a few passing showers. However, these will be very light and won't do much to cool things down. Make sure to stay hydrated and take frequent breaks if you are outdoors, as the combination of heat and humidity will make it feel even hotter than the actual temperature.
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 GFS 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 dominated by a strong subsidence inversion between 800mb and 700mb, which is typical for a robust heat ridge. Standard adiabatic lapse rates below the inversion allow for maximum surface heating.
The primary thermal ridge axis is centered along the Mississippi and Ohio River valleys, with the 594dm contour pushing into Western Kentucky.
Typical diurnal curves are expected with rapid heating after sunrise. However, Louisville Metro will show a non-diurnal lag in cooling due to urban heat retention.
Kinematics
Wind patterns and atmospheric energy. Frontal passages, jet stream positioning, and vorticity tell us where and when lift will generate precipitation.
No significant frontal passage is noted. The surface flow is weakly southwesterly, driven by the pressure gradient on the back side of a high-pressure cell over the Atlantic coast.
The jet stream is located far to the north across the Great Lakes, providing no dynamic lift to the region. This results in a 'capped' atmosphere.
Vorticity levels are generally low, though a series of weak, decaying shortwave impulses will track through Northern and Eastern Kentucky, providing just enough lift for high-based rain showers.
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 largely unsaturated. Dewpoint depressions of 25F-35F at the surface and a dry mid-layer (700-500mb) create a high risk of Virga where precipitation is forecast.
Precipitation will be light and stratiform in nature. Any convective potential is suppressed by the mid-level inversion.
Hydrologic conditions are stable with zero flood risk due to the minimal accumulation and high evaporation rates.
Extreme Heat Precedes Evening Rainfall
Prepare for a day of intense heat as temperatures soar into the upper 90s and low 100s across much of the state. The western regions will see the highest temperatures, with Paducah and Owensboro likely exceeding 100 degrees by the afternoon.
As we head into the evening, relief from the heat arrives in the form of rain. Most regions will see showers and potential thunderstorms move in from the northwest. The heaviest rain is expected in Southeast Kentucky, where over an inch of rainfall could fall in a short period.
Winds will remain generally light but may become gusty near any developing showers this evening. Overnight temperatures will stay mild, providing little cooling until the rain moves through.
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 GFS 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 profile across Kentucky is characterized by a strongly mixed boundary layer with temperatures near the surface reaching 35-40°C in the west. This is a classic heat dome signature with a warm nose at 850mb.
The thermal boundary (freezing line) is located far to the north across central Canada and does not play a role in this event.
Diurnal heating is aggressive through 21z, after which convective cooling and the loss of solar radiation will lead to a standard cooling curve, though humidity remains high.
Kinematics
Wind patterns and atmospheric energy. Frontal passages, jet stream positioning, and vorticity tell us where and when lift will generate precipitation.
No true cold frontal passage is noted; however, a surface trough and a compact shortwave will provide the necessary lift for evening showers.
Kentucky sits in the right entrance region of a 110kt 250mb jet max located over the Great Lakes, providing broad upper-level divergence.
A series of vorticity lobes will pivot through the mid-levels, with the strongest energy arriving in the east between 21z and 03z.
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 initially dry at the surface but saturates rapidly from the top down as the shortwave approaches. No virga risk is expected by evening.
The precipitation will be primarily convective in the west and central regions, becoming more stratiform with heavy embedded convective cores in the east.
Soil moisture is currently at or below normal. While Southeast Kentucky will see >1.00" of rain, flooding risk is low due to high infiltration rates and the lack of antecedent rainfall.
Overnight Showers Followed by Intense Afternoon Heat
Residents should expect a few passing rain showers during the overnight hours as a weak weather system moves through. These will be brief and should not cause any travel issues, though some areas in the southeast may see slightly more persistent rain.
Once the sun comes up, the story shifts entirely to the heat. We are looking at a very hot afternoon with temperatures climbing into the 90s for most of the state. In the far west near Paducah, temperatures could even hit 101 degrees. Be sure to stay hydrated if you are outdoors.
Clouds will clear out quickly in the morning, leaving us with mostly sunny skies for the remainder of the day. A few breezy gusts are possible in the evening as the atmosphere cools slightly.
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 GFS 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.
Strong thermal ridge (850mb > 22C) advecting into the west. Afternoon profiles are deeply mixed with dry adiabatic lapse rates near the surface.
A weak surface trough moves across the Ohio River around 06z, stalling and washing out over Southeast Kentucky.
Strongly diurnal. A non-diurnal warming trend is noted in the Purchase region as high-theta-e air arrives after the morning cloud debris clears.
Kinematics
Wind patterns and atmospheric energy. Frontal passages, jet stream positioning, and vorticity tell us where and when lift will generate precipitation.
Weak cold frontal passage between 06z-10z, evidenced by a wind shift from 190 to 280 degrees and a 2mb pressure rise.
The state is located in the right-entrance region of a 90kt H300 jet streak, which provides enough synoptic lift for the overnight light rain.
A compact shortwave trough is pivoting through the broad cyclonic flow, with a vorticity maximum of 0.00013 over Northern KY at 03z.
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).
Atmospheric column is saturated between 800mb and 500mb, but a deep dry layer exists below 850mb across Central/Western KY (Virga risk).
Predominantly stratiform light rain and sprinkles, with some terrain-enhanced showers in the Southeast.
None. Antecedent conditions are dry and storm totals are well below FFG (Flash Flood Guidance).
Late Summer Heat and Full Sunshine
Expect a picture-perfect late summer day across the Commonwealth. From the Purchase area to the mountains of the East, skies will remain clear and blue with no chance of rain.
High temperatures will range from the low 80s in Northern Kentucky to the low 90s in the far West. Light winds will provide only minimal relief from the afternoon sun, so stay hydrated if spending time outdoors.
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 GFS 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 classic subsidence profile. A low-level dry adiabatic lapse rate exists below 800mb, capped by a notable inversion between 750mb and 700mb, which is suppressing all convective development.
The 0C isotherm is located far to the north near the Canadian border; the entire Commonwealth is firmly within a warm, sub-tropical airmass.
The diurnal curve is highly predictable with rapid insolation-driven heating starting at 12Z, peaking at 21Z, followed by efficient radiational cooling under clear skies.
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 observations show light and variable winds indicative of a high-pressure center directly overhead.
The polar jet stream is positioned over the Great Lakes, leaving Kentucky in a region of weak zonal flow and no synoptic-scale lift.
The region is under broad cyclonic flow aloft, but with zero vorticity packets of significance moving through the ridge.
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 extremely dry. Large dewpoint depressions (T-Td > 20F) are present at the surface, eliminating any risk of precipitation.
None; conditions are strictly stratiform-stable.
No hydrologic risk exists as there is no forecasted precipitation and soil moisture remains at seasonal levels.