636  
FXUS01 KWBC 102003  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
402 PM EDT THU MAY 10 2018  
 
VALID 00Z FRI MAY 11 2018 - 00Z SUN MAY 13 2018  
 
...RAIN AND LATE SEASON MOUNTAIN SNOW EXPECTED ACROSS THE  
INTERMOUNTAIN WEST AND NORTHERN TO CENTRAL ROCKIES...  
 
...WIDESPREAD RED FLAG WARNINGS REMAIN IN PLACE FROM THE DESERT  
SOUTHWEST TO THE SOUTHERN HIGH PLAINS...  
 
...HEAVY RAIN AND THUNDERSTORMS WILL BE POSSIBLE ALONG AND NORTH  
OF A FRONTAL BOUNDARY STRETCHED FROM THE CENTRAL PLAINS TO THE  
NORTHERN MID-ATLANTIC STATES...  
 
...ABOVE NORMAL WARMTH WILL CONTINUE ACROSS THE SOUTHERN TIER  
WHILE COOLER CONDITIONS WILL PREVAIL OVER MUCH OF THE NORTHERN  
U.S....  
 
RAIN AND LATE SEASON MOUNTAIN SNOW IS EXPECTED WITH A LARGE SCALE  
UPPER TROUGH AMPLIFYING AND CLOSING OFF OVER THE WESTERN U.S. LATE  
THIS WEEK. THE HIGHEST RAIN AND SNOWFALL TOTALS SHOULD BE ALONG  
THE NORTHERN AND CENTRAL ROCKIES, WHERE MOIST EASTERLY FLOW INTO  
THE TERRAIN WILL ENHANCE PRECIPITATION IN THE FAVORED UPSLOPE  
REGIONS. FARTHER SOUTH, THE COMBINATION OF GUSTY WINDS AND LOW  
HUMIDITY WILL HEIGHTEN THE RISK FOR FIRE WEATHER, AND RED FLAG  
WARNINGS REMAIN IN PLACE ACROSS A LARGE PORTION OF THE DESERT  
SOUTHWEST, SOUTHERN ROCKIES, AND SOUTHERN PLAINS.  
 
BROAD WARM ADVECTION AHEAD OF THE AMPLIFYING WESTERN U.S. TROUGH  
WILL BRING AN ABUNDANCE OF MOISTURE NORTHWARD INTO A STRONG  
FRONTAL BOUNDARY STRETCHED FROM THE CENTRAL PLAINS TO THE NORTHERN  
MID-ATLANTIC STATES, FUELING HEAVY RAIN AND THUNDERSTORMS ALONG  
AND NORTH OF THE BOUNDARY FRIDAY AND SATURDAY. ALSO NORTH OF THE  
BOUNDARY, COOLER CONDITIONS WILL PREVAIL FROM THE NORTHERN PLAINS  
TO THE NORTHEAST WHILE ABOVE NORMAL WARMTH WILL CONTINUE ACROSS  
MUCH OF THE SOUTHERN TIER, WITH DAYTIME TEMPERATURES POSSIBLY  
APPROACHING OR EXCEEDING RECORD HIGHS. AN EXCEPTION TO THE ABOVE  
NORMAL TEMPERATURES WILL BE OVER THE SOUTHERN TIP OF FLORIDA,  
WHERE HEAVY RAINS AND THUNDERSTORMS ARE EXPECTED TO LIFT THROUGH  
THE REGION.  
 
GERHARDT  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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