650  
FXUS01 KWBC 110752  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
351 AM EDT FRI MAY 11 2018  
 
VALID 12Z FRI MAY 11 2018 - 12Z 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....  
 
OVER THE NEXT FEW DAYS THE CENTRAL U.S. WILL HAVE A FRONTAL  
BOUNDARY IN PLACE FROM THE CENTRAL HIGH PLAINS TO THE  
MID-ATLANTIC. WARM GULF MOISTURE WILL TRANSPORT NORTHWARD OVER  
THIS BOUNDARY AND AID IN THE DEVELOPMENT OF SHOWERS AND  
THUNDERSTORMS FROM THE CENTRAL ROCKIES, MIDWEST, LOWER GREAT  
LAKES/OHIO VALLEY- SOME THE STORMS WILL LIKELY BECOME STRONG TO  
SEVERE, WITH EMBEDDED HEAVY RAIN ALSO POSSIBLE. THE STORM  
PREDICTION CENTER HAS ISSUED A SLIGHT RISK FOR SEVERE WEATHER  
TODAY ACROSS SOUTHEAST WYOMING/NORTHEAST COLORADO, SHIFTING ON  
SATURDAY FROM NORTHERN ILLINOIS TO WESTERN NEW JERSEY. WPC HAS  
MARGINAL RISKS FOR EXCESSIVE RAINFALL WITHIN THESE COMMON AREAS,  
AS WELL.  
 
MUCH OF THE NORTHERN TIER STATES WILL BE COOLER THROUGH THE  
WEEKEND, WHILE THE CENTRAL AND SOUTHERN STATES WILL HAVE  
TEMPERATURES NEAR OR ABOVE SEASONAL NORMAL. HEAVY RAIN EXPECTED  
ACROSS SOUTH FLORIDA WILL KEEP THE HOT TEMPERATURES AT BAY. SOME  
LOCATIONS IS IN THE SOUTH/SOUTHWEST MAY REACH, OR EXCEED DAILY  
RECORDS. HOT, DRY AND WINDY CONDITIONS WILL PREVAIL ACROSS MUCH OF  
THE SOUTHWEST/SOUTHERN ROCKIES REGION WHICH WILL MAINTAIN CRITICAL  
FIRE WEATHER CONDITIONS. RED FLAG WARNINGS ARE IN EFFECT ACROSS  
MOST OF SOUTHEAST CALIFORNIA, ARIZONA, NEW MEXICO AND SOUTHERN  
COLORADO.  
 
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.  
 
CAMPBELL  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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