622  
FXUS01 KWBC 211951  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
350 PM EDT THU JUN 21 2018  
 
VALID 00Z FRI JUN 22 2018 - 00Z SUN JUN 24 2018  
 
...WET WEATHER WITH CONTINUED THREATS FOR FLASH FLOODING FROM THE  
OHIO VALLEY TO THE NORTHERN MID-ATLANTIC REGION...  
 
...THREATS FOR SEVERE STORMS FROM PORTIONS OF THE MID-ATLANTIC  
INTO THE LOWER/MID-MISSISSIPPI VALLEY INTO THE HIGH PLAINS...  
   
..HOT WEATHER IN STORE FOR CALIFORNIA INTO THE DESERT SOUTHWEST
 
 
INCREASED CHANCES FOR THUNDERSTORMS WILL BE IN PLACE NEAR A SLOW  
MOVING COLD FRONT WHICH WILL BE EDGING EAST FROM THE  
MID-MISSISSIPPI VALLEY THIS EVENING INTO THE OHIO VALLEY ON  
FRIDAY. THERE IS A SLIGHT RISK OF SEVERE STORMS NEAR THE FRONT  
ACROSS PORTIONS OF THE LOWER TO MIDDLE MISSISSIPPI VALLEY TODAY  
VIA THE STORM PREDICTION CENTER WITH MARGINAL RISKS SCATTERED FROM  
THE MID-ATLANTIC REGION INTO THE SOUTHERN HIGH PLAINS AND PORTIONS  
OF MONTANA AND WYOMING THROUGH FRIDAY MORNING. SLIGHT RISKS ARE  
PROGGED ON FRIDAY FROM THE SOUTHERN TO CENTRAL HIGH PLAINS AS WELL  
AS THE LOWER MISSISSIPPI VALLEY INTO THE SOUTHEAST IN THE VICINITY  
OF THE SOUTHERN EXTENSION OF THE SLOW MOVING FRONT. SCATTERED  
STORMS WILL BE FOUND NEAR AND SOUTH OF A QUASI-STATIONARY FRONT  
EXTENDING ACROSS THE MID-ATLANTIC STATES, POSITIONED EAST OF THE  
MAIN LOW PRESSURE CENTER MOVING EASTWARD FROM THE OHIO VALLEY.  
HIGH MOISTURE CONTENT SOUTH OF THIS BOUNDARY WILL CONTINUE TO  
SUPPORT A HUMID AIRMASS ACROSS THE SOUTH AND EAST WITH AT LEAST  
SOME THUNDERSTORM POTENTIAL, THOUGH NOT EVERYBODY WILL SEE THE  
TEMPORARY RELIEF FROM THE HEAT AND HUMIDITY FROM RAINFALL.  
 
HIGH TEMPERATURES WILL BE NEAR AVERAGE ACROSS THE NORTHEAST ON  
FRIDAY BUT CLOUDS AND RAIN WILL KEEP LOCATIONS FROM THE MISSOURI  
VALLEY INTO THE NORTHERN MID-ATLANTIC MUCH COOLER THAN MID-LATE  
JUNE AVERAGES WITH HIGHS FORECAST TO RANGE FROM THE UPPER 60S TO  
NEAR 80. FARTHER SOUTH...SOUTH OF THE AFOREMENTIONED FRONTAL  
BOUNDARY...HIGH TEMPERATURES WILL BE SEASONABLY HOT, BUT WITH  
GREATER DEPARTURES FROM AVERAGE ACROSS TEXAS (5-10 DEGREE  
DEPARTURES) WHERE 100+ DEGREE READINGS ARE EXPECTED FRIDAY AND  
SATURDAY. CALIFORNIA WILL ALSO BE HEATING UP WITH HIGHS EXPECTED  
TO ECLIPSE 100 FOR MUCH OF THE SACRAMENTO/SAN JOAQUIN VALLEY ON  
FRIDAY WITH 90S TO NEAR 100 EXPECTED INTO PORTIONS OF THE  
CALIFORNIA COASTAL RANGES FOR SATURDAY. GIVEN THE ONGOING AND  
EXPECTED HOT WEATHER, HEAT ADVISORIES AND EXCESSIVE HEAT WARNINGS  
ARE IN EFFECT FOR PORTIONS OF CALIFORNIA AND THE DESERT SOUTHWEST.  
 
ACROSS THE INTERIOR NORTHWEST U.S., FLOODING WILL CONTINUE TO BE A  
THREAT FROM SCATTERED THUNDERSTORMS FROM PORTIONS OF NORTHERN  
IDAHO INTO CENTRAL MONTANA INTO THE WEEKEND. THIS REGION HAS SEEN  
ABOVE AVERAGE RAINFALL IN RECENT WEEKS ALONG WITH SEVERAL RIVERS  
AND STREAMS IN FLOOD STAGE.  
 
OTTO  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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