116
FXUS01 KWBC 170756
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
356 AM EDT MON APR 17 2023
VALID 12Z MON APR 17 2023 - 12Z WED APR 19 2023
..HEAVY SNOW OVER THE UPPER GREAT LAKES BEGINS TO WIND DOWN
...TEMPERATURES WILL BE 10 TO 20 DEGREES BELOW AVERAGE OVER PARTS
OF THE UPPER/MIDDLE MISSISSIPPI VALLEY, UPPER GREAT LAKES, AND
OHIO VALLEY...
...THERE IS A MARGINAL RISK OF EXCESSIVE RAINFALL OVER PARTS OF
THE NORTHEAST...
ON SUNDAY, AN AREA OF LOW PRESSURE OVER THE UPPER GREAT LAKES WILL
SLOWLY MOVE NORTHEASTWARD INTO CANADA BY MONDAY EVENING. THE
ASSOCIATED FRONT WILL MOVE OFF THE EAST COAST BY MONDAY EVENING.
THE SYSTEM WILL PRODUCE RAIN OVER THE NORTHEAST AND PARTS OF THE
OHIO VALLEY. MODERATE TO HEAVY RAIN WILL ACCOMPANY THE RAIN OVER
PARTS OF THE NORTHEAST. THEREFORE, THE WPC HAS ISSUED A MARGINAL
RISK OF EXCESSIVE RAINFALL OVER PARTS OF THE NORTHEAST THROUGH
TUESDAY MORNING. THE ASSOCIATED HEAVY RAIN WILL CREATE LOCALIZED
AREAS OF FLASH FLOODING, AFFECTING AREAS THAT EXPERIENCE RAPID
RUNOFF WITH HEAVY RAIN. MOREOVER, SHOWERS AND THUNDERSTORMS WILL
DEVELOP OVER PARTS OF FLORIDA THROUGH MONDAY EVENING.
ON THE NORTHWEST SIDE OF THE STORM, HEAVY SNOW WILL DEVELOP OVER
PARTS OF THE UPPER GREAT, PRODUCING ADDITIONAL AMOUNTS NEAR 12
INCHES NEAR LAKE SUPERIOR. BY MONDAY EVENING, THE SNOW WILL BEGIN
TO TAPER OFF. HOWEVER, SNOW WILL LINGER OVER PARTS OF THE GREAT
LAKES THROUGH TUESDAY EVENING. FURTHERMORE, ON MONDAY,
TEMPERATURES WILL BE 10 TO 20 DEGREES BELOW AVERAGE OVER PARTS OF
THE UPPER/MIDDLE MISSISSIPPI VALLEY, UPPER GREAT LAKES, AND OHIO
VALLEY. RAIN AND SNOW WILL LINGER OVER PARTS OF THE NORTHEAST
THROUGH WEDNESDAY MORNING.
MEANWHILE, A FRONT OVER THE NORTHERN ROCKIES TO THE GREAT BASIN
WILL MOVE EASTWARD TO THE UPPER MIDWEST AND CENTRAL PLAINS BY
WEDNESDAY. WEAK ONSHORE FLOW AND UPPER-LEVEL ENERGY WILL CREATE
COASTAL RAIN AND HIGHER ELEVATION SNOW OVER THE PACIFIC NORTHWEST
AND NORTHERN CALIFORNIA, WITH SNOW EXTENDING INTO PARTS OF THE
SIERRA NEVADA MOUNTAINS THAT WILL BEGIN TO TAPER OFF ON TUESDAY
INTO TUESDAY EVENING. ON TUESDAY, RAIN AND SNOW WILL DEVELOP OVER
PARTS OF THE NORTHERN ROCKIES AND NORTHERN HIGH PLAINS.
AS THE SYSTEM BEGINS TO MOVE OUT OF THE ROCKIES, MOISTURE WILL
FLOW NORTHWARD OVER THE SOUTHERN PLAINS OVERNIGHT MONDAY. AS A
RESULT, EARLY ON TUESDAY, SHOWERS AND THUNDERSTORMS WILL START TO
DEVELOP OVER THE CENTRAL/SOUTHERN PLAINS. IN ADDITION, OVERNIGHT
TUESDAY, SHOWERS AND THUNDERSTORMS WILL DEVELOP OVER PARTS OF THE
NORTHERN/CENTRAL PLAINS INTO PARTS OF THE MIDDLE MISSISSIPPI
VALLEY.
ZIEGENFELDER
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
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