This is the NAM model's output only
You're viewing raw atmospheric data from the NAM 3km Nest (North American Mesoscale - High Resolution Nest). 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 InsteadSummer Heatwave Grips Kentucky
Drink plenty of water and stay in the shade if you are outdoors. High temperatures are heading into the 90s for everyone, with the hottest air settling over Owensboro, Paducah, and Louisville.
Expect mostly sunny skies throughout the day with just a few afternoon clouds. There is no rain in the forecast, so it will be a great day for outdoor activities, provided you can stay cool.
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 NAM 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 summer subsidence profile. A strong inversion is noted near 800mb across the state, which is suppressing any vertical convective growth despite surface temperatures in the mid-90s.
The main thermal ridge is centered over the Mississippi River Valley, pushing its maximum extent into Western Kentucky.
Standard diurnal heating curve is expected with rapid temperature rises between 13Z and 17Z. Some non-diurnal behavior may occur in the Louisville Metro due to the Urban Heat Island effect.
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. The state is under the influence of a stagnant maritime tropical airmass.
The jet stream is positioned well to the north across the Great Lakes, providing no dynamic lift or divergence over Kentucky.
Broad anticyclonic flow is in place. No significant shortwave troughs or vorticity maxima are noted in the NAM guidance for this period.
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 largely dry. Large dewpoint depressions at the 700mb-500mb levels indicate a significant risk of any light precipitation evaporating before reaching the ground (Virga), though PoPs remain too low for even that to occur.
Stratiform and convective elements are absent.
The ground is becoming increasingly dry due to the lack of recent rainfall; no hydrologic concerns exist.
Extreme Heat West, Evening Rain East
Residents in Western Kentucky should prepare for a dangerously hot day, with temperatures climbing into the mid-to-upper 90s and heat indices surpassing 100 degrees. Expect plenty of sunshine and dry conditions throughout the day in areas like Paducah and Owensboro.
Further east, the weather takes a different turn. After a warm afternoon, a wave of rain and potential thunderstorms will move through the Louisville, Lexington, and Northern Kentucky areas during the evening. The heaviest rain is expected in the Lake Cumberland region, where over an inch of rainfall could fall in a short period.
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 NAM 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 pre-frontal warm sector across the west with surface temps in the 90s, while the east undergoes a transition to a moist adiabatic profile as the boundary layer saturates.
The cold front is modeled to be pushing through the I-75 corridor by 21:00, while remaining stalled north of the Purchase and Pennyrile regions.
Highly non-diurnal in the eastern half of the state, where evening rain will cause temperatures to drop sharply from afternoon highs.
Kinematics
Wind patterns and atmospheric energy. Frontal passages, jet stream positioning, and vorticity tell us where and when lift will generate precipitation.
Frontal passage is evident in the Louisville and Northern KY regions between 18:00 and 21:00 local time, marked by a 15-20 degree temperature drop.
Support is provided by a 100kt jet streak over the Great Lakes, placing Eastern KY in the right-entrance region, fostering large-scale ascent.
A compact and energetic shortwave trough is pivoting through, with vorticity values peaking at 0.0006 in Northeast KY.
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 atmosphere is dry in the west but reaches full saturation (T/Td spread < 3F) in the central and eastern regions by 21:00.
Predominantly stratiform rain with embedded convective elements where surface heating was highest.
The ground remains relatively dry from previous days, so the 1.17in of rain modeled for Lake Cumberland should be absorbed without widespread flooding.