Forecast For

Friday, May 15

Updated May 15, 6:57 AM EDT

Confidence

85%

Summary Regions Outcomes Battles Analysis Almanac Charts

Confidence

85%

Pleasant Spring Warmth with Increasing Evening Clouds

A dominant high-pressure system will provide a stellar spring day across Kentucky, with temperatures ranging from the upper 60s in the northeast to the low 80s in the west. While a moisture-starved boundary will approach the Ohio River this evening, bringing increased cloud cover to the western half of the state, significant dry air in the lower atmosphere will likely evaporate any precipitation before it reaches the ground.

Why is this happening?

Technical explanation of the atmospheric setup

Confidence Assessment

High confidence in the temperature gradient and dry conditions for 90% of the state; moderate confidence in the total absence of sprinkles in the far west due to the weak frontal signal.

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Purchase Area

Paducah, Murray, Mayfield

Warm and Increasingly Cloudy

Cloudy

81°/ 53°

Expect a warm day with plenty of sunshine through the mid-afternoon. Clouds will thicken by the evening as a weak front approaches, but no rain is expected to reach the ground.

Precipitation20%

Wind11 mph / 25 mph

Wind Chill53°

The "Why"

Highs will reach 81F under strong insolation. While the Euro suggests a 0.02" QPF, the **850-700mb dry slot** favors a dry forecast with only high-based clouds.

Northwest Pennyrile

Owensboro, Henderson, Morganfield

Pleasant with Late Day Clouds

Cloudy

78°/ 50°

A beautiful spring day with temperatures in the upper 70s. Clouds will increase after sunset, but dry air will prevent any rain from reaching the surface.

Precipitation20%

Wind10 mph / 20 mph

Wind Chill50°

The "Why"

Vertical mixing will allow for occasional 20 mph gusts. Forecasted virga is likely between 22Z-02Z as the moisture-starved boundary passes.

Southwest Pennyrile

Hopkinsville, Madisonville, Princeton

Sunny and Mild

Sunny

80°/ 49°

Sunshine will dominate the day with highs in the lower 80s. A few clouds will drift in late tonight, but conditions will remain dry for all outdoor plans.

Precipitation< 10%

Wind10 mph / 18 mph

Wind Chill49°

The "Why"

Deep subsidence under the ridge axis keeps the column dry. PWAT values are below 0.75 inches, precluding any shower development.

Barren River

Bowling Green, Glasgow, Franklin

Ideal Spring Weather

Sunny

77°/ 45°

A perfect day for the Bowling Green area with clear skies and comfortable temperatures in the upper 70s. Light winds will make for a calm afternoon.

Precipitation< 10%

Wind9 mph / 18 mph

Wind Chill45°

The "Why"

Radiational cooling in the morning will be scoured by high solar angles. No cloud development expected until after midnight.

Louisville Metro

Louisville, La Grange, Shepherdsville

Sunny and Pleasant in the City

Sunny

75°/ 48°

The Louisville area will enjoy a dry, sunny day with temperatures hitting the mid-70s. Clouds will move in very late tonight, but no rain is expected.

Precipitation< 10%

Wind7 mph / 18 mph

Wind Chill48°

The "Why"

Urban heat island will keep lows slightly higher than rural neighbors. Boundary layer remains too dry for any precip realization from the weak front to the north.

Lincoln Trail

Elizabethtown, Bardstown, Leitchfield

Bright and Comfortable

Sunny

74°/ 45°

Expect abundant sunshine across the region today with temperatures in the mid-70s. It will be a bit cooler than the far west but very comfortable.

Precipitation< 10%

Wind8 mph / 20 mph

Wind Chill45°

The "Why"

The Muldraugh Escarpment will not provide enough lift for the moisture-starved front to produce rain. High pressure remains the dominant feature.

Lake Cumberland

Somerset, Columbia, Monticello

Spectacular Lake Day

Sunny

74°/ 43°

Expect calm winds and sunny skies, making for excellent conditions on the water. Highs will reach the mid-70s after a cool morning.

Precipitation< 10%

Wind5 mph / 12 mph

Wind Chill43°

The "Why"

Strong subsidence from the high-pressure ridge will maintain clear skies and inhibit any vertical cloud growth near lake surfaces.

Northern Kentucky

Covington, Florence, Independence

Partly Cloudy and Mild

Cloudy

70°/ 45°

Northern Kentucky will see more clouds than the southern half of the state, especially this afternoon. Temperatures will be comfortable in the low 70s.

Precipitation< 10%

Wind6 mph / 16 mph

Wind Chill45°

The "Why"

Proximity to the northern stream shortwave will result in a 70-80% cloud deck, but low-level dry air maintains a dry forecast.

Inner Bluegrass

Lexington, Georgetown, Winchester

Pleasant Afternoon

Cloudy

71°/ 45°

Lexington will enjoy a mix of sun and clouds with highs in the low 70s. It will be a dry and pleasant day for outdoor activities.

Precipitation< 10%

Wind7 mph / 14 mph

Wind Chill45°

The "Why"

Mid-level moisture advection brings in a broken cloud deck by 18Z, but the surface remains entrenched in a dry air mass.

Bluegrass Foothills

Richmond, Danville, Berea

Quiet Spring Day

Cloudy

71°/ 43°

A very nice day is expected with highs near 70 degrees. Afternoon clouds will pass through, but no rain is in the forecast.

Precipitation< 10%

Wind5 mph / 10 mph

Wind Chill43°

The "Why"

Terrain-induced mixing will be limited. High pressure remains centered to the southeast, maintaining light southwesterly flow.

Northeast Kentucky

Ashland, Morehead, Grayson

Cool Start, Warm Finish

Cloudy

70°/ 41°

After a chilly start near 40 degrees, the sun will warm the northeast to a comfortable 70 by the afternoon. Expect some clouds later in the day.

Precipitation< 10%

Wind4 mph / 7 mph

Wind Chill41°

The "Why"

Cold air drainage in the deep valleys will create a 30-degree diurnal swing. Column remains moisture-starved.

Southeast Kentucky

Hazard, Pikeville, Harlan

Sunny Mountain Skies

Sunny

72°/ 40°

A spectacular day for the mountains. After a crisp morning, temperatures will rise into the low 70s under plenty of sunshine.

Precipitation< 10%

Wind3 mph / 8 mph

Wind Chill40°

The "Why"

Maximum radiational cooling is expected in the deep valleys. The dry air mass allows for highly efficient solar heating through 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

If the boundary layer saturates faster than modeled, a few areas in the Purchase and Northwest Pennyrile could see a trace to 0.02 inches of light rain after sunset.

💨

The 'Bust' Scenario

If the high-pressure ridge remains stronger and slower to depart, the entire state remains under clear skies through the night with no evening cloud deck in the west.

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 Vendetta

A significant disagreement exists between the global models (GFS/Euro) and the mesoscale/regional models (NAM/GEM) regarding precipitation reaching the ground. The GFS and Euro show a 'smear' of light QPF (0.01-0.02") across Western KY, while the NAM and GEM remain dry.

NAM

GFS

EURO

Why NAM Wins

The NAM and GEM better resolve the significant dry air in the sub-cloud layer (below 700mb). Given the forecasted 20F+ dewpoint depressions, any light reflectivity is highly likely to manifest as virga rather than measurable rainfall.

Affected Regions

PURCHASENORTHWEST PENNYRILELINCOLN TRAIL

Technical Analysis

This section provides a deep, physics-based explanation of the weather. Our AI system analyzed multiple atmospheric layers and variables from all available models to synthesize this technical overview.

Below you'll find detailed breakdowns of the atmospheric dynamics that are driving today's forecast, including thermodynamics, kinematics, and hydrology.

Thermodynamics

Stability & Temperatures

How temperature changes with altitude. This determines whether precipitation falls as rain, snow, sleet, or freezing rain based on the vertical temperature profile.

Thermal Profile Overview

A classic dry spring profile is in place with a standard adiabatic lapse rate. Shallow nocturnal inversions in the eastern valleys will erode quickly after sunrise.

Thermal Boundary

The primary thermal boundary is a weak, moisture-starved cold front stalling along the Ohio River this evening.

Diurnal Trend

A standard diurnal curve is expected, though the western third of the state will see a leveling of temperatures after 6:00 PM due to cloud cover arrival.

Kinematics

Wind & Energy

Wind patterns and atmospheric energy. Frontal passages, jet stream positioning, and vorticity tell us where and when lift will generate precipitation.

Frontal Passage

A weak cold front enters Northwest Kentucky around 21Z, marked by a subtle wind shift to the northwest, but with negligible thermal advection.

Jet Stream Support

Kentucky resides in a neutral zone between the polar jet to the north and the subtropical jet to the south, providing minimal synoptic lift.

Energy Status

Weak positive vorticity advection is noted as the southern tail of a Great Lakes shortwave brushes the state.

Hydrology

Moisture & Precipitation

Moisture content and precipitation character. This reveals whether the atmosphere is saturated enough to produce precipitation, and what type to expect (steady vs. bursts).

Saturation Status

The atmospheric column is largely unsaturated. Significant virga risk exists in the west as mid-level moisture fails to overcome surface dryness.

Precipitation Character

Expect high-based stratiform clouds in the west; otherwise, clear skies will prevail.

Flooding Context

No hydrologic risk; ground conditions are receptive to any potential moisture.

Celestial Almanac

View NAM Analysis View GFS Analysis View ECMWF Analysis View GEM Analysis