773
FXUS01 KWBC 190737
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
336 AM EDT SAT APR 19 2025
VALID 12Z SAT APR 19 2025 - 12Z MON APR 21 2025
...MODERATE TO HEAVY SNOW OVER PARTS OF THE CENTRAL/SOUTHERN
ROCKIES ON SATURDAY...
...THERE IS A MODERATE RISK OF EXCESSIVE RAINFALL OVER PARTS OF
THE MIDDLE MISSISSIPPI VALLEY TO THE SOUTHERN PLAINS ON SATURDAY...
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PARTS OF
THE MIDDLE/LOWER MISSISSIPPI VALLEY AND THE SOUTHERN PLAINS ON
SATURDAY AND AN ENHANCED RISK OF SEVERE THUNDERSTORMS OVER PARTS
OF THE MIDDLE/LOWER MISSISSIPPI VALLEY ON SUNDAY...
A FRONT EXTENDING FROM THE GREAT LAKES/OHIO VALLEY AND THEN ACROSS
THE MIDDLE/LOWER MISSISSIPPI VALLEY INTO THE SOUTHERN PLAINS WILL
MOVE EASTWARD OFF THE NORTHEAST COAST AND FROM THE MID-ATLANTIC TO
THE SOUTHERN PLAINS BY SUNDAY MORNING. ON SATURDAY, THE SYSTEM
WILL PRODUCE SHOWERS AND THUNDERSTORMS FROM PARTS OF THE NORTHEAST
TO THE SOUTHERN PLAINS AND SEVERE THUNDERSTORMS FROM THE
MIDDLE/LOWER MISSISSIPPI VALLEY TO THE SOUTHERN PLAINS. THEREFORE,
THE SPC HAS ISSUED A SLIGHT RISK (LEVEL 2/5) OF SEVERE
THUNDERSTORMS OVER PARTS OF THE MIDDLE/LOWER MISSISSIPPI VALLEY TO
THE SOUTHERN PLAINS THROUGH SUNDAY MORNING. THE HAZARDS
ASSOCIATED WITH THESE THUNDERSTORMS ARE FREQUENT LIGHTNING, SEVERE
THUNDERSTORM WIND GUSTS, HAIL, AND A FEW TORNADOES. FURTHERMORE,
THERE IS AN ADDED THREAT OF HAIL, TWO INCHES OR GREATER, OVER THE
SOUTHERN PLAINS.
IN ADDITION, THE SHOWERS AND THUNDERSTORMS WILL PRODUCE HEAVY RAIN
OVER PARTS OF THE MIDDLE MISSISSIPPI VALLEY AND THE SOUTHERN
PLAINS ON SATURDAY. THEREFORE, THE WPC HAS ISSUED A MODERATE RISK
(LEVEL 3/4) OF EXCESSIVE RAINFALL OVER PARTS OF THE MIDDLE
MISSISSIPPI VALLEY INTO THE SOUTHERN PLAINS THROUGH SUNDAY
MORNING. NUMEROUS FLASH FLOODING EVENTS ARE POSSIBLE AND MANY
STREAMS MAY FLOOD, POTENTIALLY AFFECTING LARGER RIVERS.
FURTHER, AN UPPER-LEVEL LOW ASSOCIATED WITH THE WESTERN END OF THE
FRONT WILL PRODUCE MODERATE TO HEAVY SNOW OVER PARTS OF THE
CENTRAL/SOUTHERN ROCKIES. RAIN WILL ALSO DEVELOP OVER THE LOWER
ELEVATIONS OF THE SOUTHWEST AND CENTRAL HIGH PLAINS. THE SNOW WILL
END OVER THE REGION BY SUNDAY MORNING.
ON SUNDAY, A WAVE OF LOW PRESSURE ALONG THE BOUNDARY MOVES
NORTHWARD FROM THE SOUTHERN PLAINS TO THE UPPER MISSISSIPPI VALLEY
BY MONDAY MORNING. THE FRONT WILL PRODUCE SHOWERS AND SEVERE
THUNDERSTORMS OVER PARTS OF THE MIDDLE/LOWER MISSISSIPPI VALLEY.
THEREFORE, THE SPC HAS ISSUED AN ENHANCED RISK (LEVEL 3/5) OF
SEVERE THUNDERSTORMS OVER THE MIDDLE/LOWER MISSISSIPPI VALLEY FROM
SUNDAY INTO MONDAY MORNING. THE HAZARDS ASSOCIATED WITH THESE
THUNDERSTORMS ARE FREQUENT LIGHTNING, SEVERE THUNDERSTORM WIND
GUSTS, HAIL, AND A FEW TORNADOES.
IN ADDITION, THE THREAT OF EXCESSIVE RAINFALL WILL DECREASE ON
SUNDAY OVER PARTS OF THE MIDDLE/LOWER MISSISSIPPI VALLEY TO A
MARGINAL RISK. MOREOVER, SHOWERS AND THUNDERSTORMS WILL EXPAND
INTO THE GREAT LAKES/ OHIO VALLEY. FURTHERMORE, AN AREA OF WET
SNOW WILL DEVELOP NEAR LAKE SUPERIOR ON MONDAY MORNING.
MEANWHILE, ON SATURDAY, A FRONT OVER THE PACIFIC NORTHWEST WILL
MOVE EASTWARD TO THE NORTHERN HIGH PLAINS TO THE NORTHERN
INTERMOUNTAIN REGION/GREAT BASIN AND DISSIPATE BY SUNDAY MORNING.
THE SYSTEM WILL PRODUCE LIGHT RAIN OVER PARTS OF THE NORTHWEST,
MOVING INTO THE NORTHERN INTERMOUNTAIN REGION BY SATURDAY EVENING.
BY SUNDAY MORNING, ADDITIONAL LIGHT RAIN WILL MOVE INTO THE
PACIFIC NORTHWEST. AS THE ASSOCIATED ENERGY MOVES EASTWARD, RAIN
AND HIGHEST ELEVATION SNOW WILL DEVELOP OVER PARTS OF THE NORTHERN
INTERMOUNTAIN REGION AND NORTHERN ROCKIES OVERNIGHT SUNDAY.
ZIEGENFELDER
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
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