Sunday, May 17
Summer Heat Arrives Early with Passing Morning Showers North
A potent ridge of high pressure building from the southwest will bring unseasonably warm, summer-like conditions to Kentucky. While the vast majority of the state will remain dry and sunny, a weak, decaying shortwave trough will clip northern and eastern sections of the Commonwealth early Sunday, bringing a few light rain showers before clearing by midday.
Confidence Assessment
High agreement exists on the overall warm-up and the lack of severe weather. The only uncertainty remains the exact southern extent and timing of the dissipating rain showers in the north.
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Purchase Area
A beautiful and very warm day is ahead for the Purchase area. Expect full sunshine from morning until sunset, with afternoon temperatures reaching the upper 80s.
Northwest Pennyrile
It will feel like summer in Owensboro and Henderson, with plenty of sunshine and highs in the upper 80s. A breezy afternoon will keep the air moving.
Southwest Pennyrile
Expect clear blue skies and temperatures nearing 90 degrees. It will be a perfect day for outdoor activities, though it will feel quite warm.
Barren River
Bowling Green will see plenty of sun and highs in the upper 80s. Any early morning clouds will vanish quickly.
Louisville Metro
A brief, light sprinkle is possible before sunrise in the metro area. Otherwise, expect clearing skies and a warm afternoon with highs in the mid-80s.
Lincoln Trail
Expect a beautiful day across Elizabethtown and the surrounding plateau. Sunshine will be the main story with highs in the upper 80s.
Lake Cumberland
A perfect Sunday for the water with lots of sun and warm temperatures in the mid-80s. Winds will remain fairly light.
Northern Kentucky
Light rain showers are likely before 8:00 AM, but the clouds will quickly break to reveal a sunny and warm afternoon with highs in the mid-80s.
Inner Bluegrass
Lexington might see a stray shower early in the morning, but the rest of the day will be sunny and warm with highs near 85.
Bluegrass Foothills
A warm and dry day is expected for Richmond and Berea. While an afternoon sprinkle is possible in the hills, most areas will stay dry.
Northeast Kentucky
Clouds will linger through the morning in Ashland and Morehead, perhaps with a quick sprinkle. The sun will break through by lunch, pushing highs into the mid-80s.
Southeast Kentucky
A beautiful mountain Sunday with plenty of sunshine. Temperatures will turn very warm by afternoon after a comfortable morning in the valleys.
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 'Boom' scenario involves the ridge building even faster than modeled, pushing temperatures to the 90-degree mark in the Purchase and Barren River regions while suppressing all precipitation to just trace sprinkles in the far north.
The 'Bust' Scenario
The 'Bust' scenario would see cloud cover from the morning shortwave linger through the afternoon in Northern and Eastern Kentucky, holding high temperatures in the upper 70s and allowing for a few more persistent light showers than currently forecast.
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 vs. Rain Conflict
Models agree on the presence of a shortwave, but disagree on whether moisture can overcome the dry sub-cloud layer. The GFS/Euro are more aggressive with measurable light rain, while the NAM suggests significant evaporation (virga).
Why NAM Wins
The NAM typically handles the dry boundary layer and shallow warm-sector moisture profiles better in these high-pressure regimes; therefore, precipitation totals were nudged downward.
The Heat Peak Discrepancy
The GFS and NAM are roughly 3-5 degrees cooler for afternoon highs compared to the GEM and Euro, which push several regions into the upper 80s.
Why EURO Wins
In mid-May, building ridges of this magnitude often over-perform on temperature. The ECMWF's handling of 850mb thermal advection is preferred here.
Celestial Almanac
New Moon
Purchase Area
Northwest Pennyrile
Southwest Pennyrile
Barren River
Louisville Metro
Lincoln Trail
Lake Cumberland
Northern Kentucky
Inner Bluegrass
Bluegrass Foothills
Northeast Kentucky
Southeast Kentucky
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.