440  
FXUS01 KWBC 241719  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
1219 PM EST SAT FEB 24 2018  
 
VALID 00Z SUN FEB 25 2018 - 00Z TUE FEB 27 2018  
 
...FLASH FLOODING IS LIKELY FROM THE SOUTHERN PLAINS INTO THE OHIO  
VALLEY TODAY AND TONIGHT...  
 
...ENHANCED RISK OF SEVERE THUNDERSTORMS/TORNADOES OVER PARTS OF  
THE LOWER MISSISSIPPI AND LOWER OHIO VALLEYS...  
   
..HEAVY SNOW OVER THE CASCADES AND NORTHERN ROCKIES
 
 
   
..HEAVY SNOW FOR UPPER MISSISSIPPI VALLEY/UPPER GREAT LAKES
 
 
COLD AIR ALOFT ASSOCIATED WITH AN UPPER LEVEL DISTURBANCES AND  
ONSHORE FLOW WILL LEAD TO A WET REGIME ACROSS THE NORTHWEST, WITH  
COASTAL RAIN AND HIGHER ELEVATION SNOW THROUGH SUNDAY NIGHT  
ASSOCIATED WITH A PAIR OF FRONTAL ZONES AT THE TROUGH'S LEADING  
EDGE. NORTHERN CALIFORNIA AND THE CENTRAL ROCKIES WILL BE GREETED  
BY LOWER ELEVATION RAIN/HIGHER ELEVATION AND INTERIOR SNOW  
INTERMITTENTLY INTO MONDAY.  
 
A WAVE OF LOW PRESSURE OVER THE SOUTHERN PLAINS WILL DEEPEN  
RAPIDLY AND OCCLUDE WHILE MOVING THROUGH THE GREAT LAKES SUNDAY  
MORNING. THE SYSTEM WILL PRODUCE SNOW -- HEAVY AT TIMES -- TO THE  
LEFT OF ITS TRACK OVER PARTS OF THE NORTHERN PLAINS, THE UPPER  
MIDWEST, AND UPPER PENINSULA OF MICHIGAN BY SATURDAY NIGHT,  
CLEARING THE GREAT LAKES BY SUNDAY EVENING. CLOSER TO ITS COLD  
AND WARM FRONTS, SHOWERS AND THUNDERSTORMS WITH A HIGH RISK OF  
FLASH FLOODING OVER PARTS OF THE LOWER/MIDDLE MISSISSIPPI VALLEY  
INTO PARTS OF THE OHIO VALLEY BY SATURDAY EVENING. PER THE STORM  
PREDICTION CENTER, SOME THUNDERSTORMS IN MAY BE SEVERE (INCLUDING  
TORNADOES) TODAY AND TONIGHT ACROSS PORTIONS OF THE MISSISSIPPI  
VALLEY, OHIO VALLEY, AND TENNESSEE. SHOWERS AND THUNDERSTORMS  
LINGER ACROSS THE WESTERN/CENTRAL GULF COAST INTO SUNDAY NIGHT AS  
THE COLD FRONT STALLS AND WEAK WAVES RIPPLE ALONG THE BOUNDARY.  
 
PRECIPITATION THEN MOVES EASTWARD INTO A MORE STABLE AIRMASS AS AN  
AREA OF RAIN INTO THE SOUTHERN MID-ATLANTIC/SOUTHEAST SUNDAY  
AFTERNOON AND EVENING AND THE NORTHEAST ON SUNDAY. SNOW IS  
EXPECTED ACROSS NORTHERN NEW ENGLAND. AREAS OF FREEZING RAIN ARE  
ALSO POSSIBLE IN NEW ENGLAND.  
 
ROTH  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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