542  
FXUS01 KWBC 200729  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
329 AM EDT WED MAR 20 2019  
 
VALID 12Z WED MAR 20 2019 - 12Z FRI MAR 22 2019  
 
...MAJOR TO HISTORIC RIVER FLOODING WILL CONTINUE ACROSS PARTS OF  
THE MISSISSIPPI AND MISSOURI RIVER BASINS WITH AREAL FLOODING A  
THREAT ACROSS PARTS OF THE NORTHWEST AND NORTHERN ROCKIES AS  
WELL...  
 
...A DEVELOPING COASTAL STORM IS LIKELY BRING UNSETTLED WEATHER TO  
THE MID-ATLANTIC AND NORTHEAST BY THURSDAY...  
 
DESPITE DRY WEATHER, MAJOR TO HISTORIC AND CATASTROPHIC FLOODING  
WILL CONTINUE ACROSS PARTS OF THE MISSOURI AND MISSISSIPPI RIVER  
BASINS DUE TO RAPID SNOWMELT AS A RESULT OF HEAVY RAINFALL LAST  
WEEK. FLOOD WARNINGS AND ADVISORIES REMAIN IN EFFECT FOR PARTS OF  
THE REGION. AREAL FLOODING IS ALSO A CONCERN ACROSS PARTS OF THE  
NORTHWEST AND NORTHERN ROCKIES/HIGH PLAINS AS WARM TEMPERATURES  
THIS WEEK ARE LEADING TO ACCELERATED SNOWMELT AND THE POTENTIAL  
FOR ICE JAMS.  
 
A COLD FRONT MOVING INTO CALIFORNIA THIS MORNING AND THROUGH THE  
SOUTHWEST STATES BY THURSDAY WILL BRING INCREASED CHANCES FOR RAIN  
AND MOUNTAIN SNOWS TO CALIFORNIA, THE CENTRAL GREAT BASIN, AND  
INTO THE SOUTHWEST/FOUR CORNERS REGION. MEANWHILE, A COUPLE OF  
WEAK FRONTS MOVING THROUGH THE MIDWEST WILL ALLOW FOR MAINLY LIGHT  
RAIN FROM THE MID-MISSISSIPPI VALLEY TO THE OHIO VALLEY, WITH SOME  
LIGHT SNOWS ALSO POSSIBLE ACROSS THE UPPER GREAT LAKES. THE MAIN  
SENSIBLE WEATHER THREAT IN THE SHORT RANGE HOWEVER WILL BE WITH A  
DEVELOPING COASTAL LOW PRESSURE SYSTEM OFF THE CAROLINA COASTS ON  
WEDNESDAY, TRACKING UP THE EAST COAST THE END OF THIS WEEK.  
MODERATE TO LOCALLY HEAVY RAINFALL IS LIKELY ACROSS THE  
MID-ATLANTIC STATES ON THURSDAY SHIFTING NORTHWARD INTO THE  
NORTHWEST BY FRIDAY, WITH THE POTENTIAL FOR ACCUMULATING SNOWFALL  
ACROSS PORTIONS OF THE INTERIOR NORTHEAST AS WELL.  
 
SANTORELLI  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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