Wednesday, September 2
Late Summer Heat Peaks with Record Temperatures and Virga
A powerful upper-level ridge will dominate Kentucky's weather, bringing record-breaking heat with temperatures reaching the upper 90s to near 100 degrees. While a weak disturbance may introduce mid-level clouds and a few sprinkles in central and eastern regions, dry low-level air will likely evaporate most precipitation before it reaches the ground.
Confidence Assessment
High agreement on the thermal magnitude of the ridge, but moderate uncertainty regarding how much mid-level cloud debris will dampen the peak heating in eastern Kentucky.
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Purchase Area
Expect a dangerously hot day with temperatures approaching 100 degrees. Skies will remain clear with no chance of rain.
Northwest Pennyrile
Temperatures will likely hit the 100-degree mark in the afternoon. A few high clouds may appear but will provide no relief.
Southwest Pennyrile
A very hot and sunny day is on tap with temperatures reaching the upper 90s by early afternoon.
Barren River
Expect temperatures in the mid-90s under sunny skies. Afternoon humidity may make it feel even hotter.
Louisville Metro
The urban core will likely reach 100 degrees this afternoon. Expect constant sunshine and minimal cooling in the evening.
Lincoln Trail
Temperatures will reach the mid-90s by the afternoon with no significant cloud cover or rain expected.
Lake Cumberland
Highs will reach the mid-90s. Some clouds will move in during the afternoon, and a stray sprinkle is possible but unlikely to wet the ground.
Northern Kentucky
Temperatures will soar to near 100 degrees. Expect gusty winds and mostly sunny skies throughout the day.
Inner Bluegrass
Expect mid-to-upper 90s. Cloud cover will increase in the afternoon, potentially bringing a few light sprinkles that will mostly evaporate.
Bluegrass Foothills
A hot day with highs in the mid-90s. Clouds will arrive late, but no significant rain is expected.
Northeast Kentucky
Expect upper 90s in the valleys. Some light rain may fall from high clouds, but it will likely evaporate before reaching the ground.
Southeast Kentucky
Even the mountains will feel the heat with highs in the mid-90s. A few clouds and light sprinkles are possible in the afternoon.
Possible Outcomes
Weather forecasting involves uncertainty. Below are two scenarios representing the range of possible outcomes: the "Boom" scenario shows the worst-case/highest-impact result if conditions align unfavorably, while the "Bust" scenario shows the best-case/lowest-impact result if the forecast doesn't materialize as expected.
The 'Boom' Scenario
The ridge maximizes its potential with full solar insolation, pushing temperatures to 101-102 degrees in urban corridors like Louisville and the Purchase region, while mid-level moisture remains too thin to provide even temporary shade.
The 'Bust' Scenario
The weak mid-level disturbance produces widespread cloud cover by midday, capping temperatures in the low 90s and allowing for scattered light showers to actually overcome the dry air and wet the pavement.
Model Disagreements
When models disagree, a call must be made to determine the most likely outcome. This decision is based on a combination of factors including model performance, historical data, and the models general accounting of each climatic region of Kentucky.
The Virga Paradox
A sharp disagreement exists regarding precipitation coverage. The ECMWF suggests 80% PoPs for trace rainfall, while the GFS remains bone dry.
Why GFS Wins
With surface temperatures in the upper 90s and a 594dm ridge overhead, the capping inversion and low-level dry air are too formidable. The GFS logic of a dry boundary layer is more physically consistent for this setup.
Celestial Almanac
Waning Gibbous
Purchase Area
Northwest Pennyrile
Southwest Pennyrile
Barren River
Louisville Metro
Lincoln Trail
Lake Cumberland
Northern Kentucky
Inner Bluegrass
Bluegrass Foothills
Northeast Kentucky
Southeast Kentucky
Forecast Charts
These maps are generated by the weather agencies based on the raw data that the weather models predict. The final forecast is generated using the same raw data shown on the map. Keep in mind that the models (and therefore the maps) will generally disagree on specific parts of the forecast. Use these as guidance - not as a final prediction.
Dive Deeper Into the Models
This forecast is a synthesis of raw data from the NAM, GFS, ECMWF, and GEM models. These models provide detailed atmospheric analyses including 500mb vorticity, precipitation rates, and more. You can take a look at the raw model data by clicking the links below.