091  
FXUS01 KWBC 031835  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
234 PM EDT TUE JUL 03 2018  
 
VALID 00Z WED JUL 04 2018 - 00Z FRI JUL 06 2018  
 
...ABOVE AVERAGE HEAT FOR JULY SHIFTS FROM THE EAST BACK INTO THE  
PLAINS AND EVENTUALLY THE GREAT BASIN/SOUTHWEST BY FRIDAY...  
 
ANOTHER AREA OF HEAVY RAIN IS LIKELY ACROSS PARTS OF THE DAKOTAS,  
IOWA, AND MINNESOTA (NEAR WHERE FLOODING OCCURRED THIS MORNING)  
WITH ANOTHER LOW PRESSURE SYSTEM THAT WILL BE CROSSING THE  
NORTHERN PLAINS TODAY INTO WEDNESDAY, WITH THE SURFACE LOW  
STRENGTHENING WHILE MOVING NORTHEAST THROUGH CANADA. SHOWERS AND  
THUNDERSTORMS WITH THIS SYSTEM WILL SPREAD EASTWARD THROUGH THE  
GREAT LAKES WEDNESDAY AND THURSDAY BEFORE MOVING INTO THE  
NORTHEAST THURSDAY AFTERNOON INTO FRIDAY.  
 
A STALLED FRONT IN THE THE NORTHEAST/MID-ATLANTIC STATES TODAY AND  
TOMORROW ALONG WITH MOIST FLOW OFF THE NORTH ATLANTIC OCEAN WILL  
BE THE IMPETUS FOR AREAS OF SHOWERS AND THUNDERSTORMS FROM  
PENNSYLVANIA TO EASTERN NEW ENGLAND TODAY AND THROUGHOUT THE  
MID-ATLANTIC STATES AND SOUTHEAST TOMORROW. TO THE SOUTH ACROSS  
THE GULF COAST REGION, WITHIN AN EASTERLY FLOW REGIME, A  
CONVECTIVE LOW PRESSURE SYSTEM WILL ENHANCE SHOWERS AND STORMS  
FROM SOUTHERN MISSISSIPPI TO SOUTHEAST TEXAS, WITH LOCALLY HEAVY  
RAIN THAT MAY CAUSE FLOODING ISSUES ACROSS LOUISIANA AND TEXAS  
THIS AFTERNOON THROUGH JULY 4TH.  
 
DRY CONDITIONS ARE EXPECTED TO CONTINUE FOR MOST OF THE WESTERN  
U.S., WHICH WHEN COMBINED WITH THE WARM TEMPERATURES, HAS LED TO A  
NUMBER OF RED FLAG WARNINGS FOR FIRE DANGER FROM THE COLUMBIA  
BASIN THROUGH THE GREAT BASIN INTO EASTERN COLORADO.  
 
THE ONGOING HEAT WAVE ACROSS THE EASTERN U.S. IS REACHING ITS PEAK  
TODAY AND TOMORROW, WITH HEAT REBUILDING ACROSS THE CENTRAL  
PLAINS/MIDWEST. AN IMPRESSIVE UPPER LEVEL RIDGE IS IN PLACE OVER  
THE EASTERN U.S. WHICH BUILDS/EXPANDS WESTWARD OVER THE NEXT FEW  
DAYS. HEAT ADVISORIES AND HEAT WARNINGS ARE IN EFFECT FROM THE  
CENTRAL PLAINS INTO THE NORTHEAST. HIGH TEMPERATURES IN THE 90S  
TO NEAR 100F, COMBINED WITH HIGH DEWPOINTS, IS EXPECTED RESULT IN  
HEAT INDICES OF 95 TO 110 DEGREES FOR MANY AREAS. OVERNIGHT LOWS  
WILL ALSO BE QUITE SULTRY, ESPECIALLY IN URBAN AREAS WHERE  
READINGS COULD REMAIN ABOVE 75 DEGREES ALL NIGHT THROUGH WEDNESDAY  
NIGHT. AS THE RIDGE ALOFT BUILDS WESTWARD, THE EXCESSIVE HEAT  
SHIFTS INTO THE DESERT AND GREAT BASIN, WITH RECORD WARM LOW  
(70S-90S) AND SOME HIGH TEMPERATURES (90S-110S) FORECAST, MAINLY  
ACROSS THE DESERT SOUTHWEST.  
 
ROTH/HAMRICK  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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