395  
FXUS02 KWBC 190646  
PMDEPD  
 
EXTENDED FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
245 AM EDT SUN MAY 19 2019  
 
VALID 12Z WED MAY 22 2019 - 12Z SUN MAY 26 2019  
   
..OVERALL WEATHER PATTERN
 
 
THE UPPER LEVEL PATTERN ACROSS THE CONTINENTAL U.S. WILL REMAIN  
QUITE AMPLIFIED AND SLOW TO CHANGE NEXT WEEK. A HOT UPPER LEVEL  
RIDGE OVER THE SOUTHEAST U.S. BECOMES ANCHORED OVER THE REGION AND  
GRADUALLY BECOMES STRONGER FOR THE SECOND HALF OF THE UPCOMING  
WORK WEEK. ACROSS THE WESTERN U.S., A LARGE SCALE UPPER TROUGH  
WILL BE DOMINANT AS MULTIPLE SHORTWAVE PERTURBATIONS KEEP  
CONDITIONS COOL AND UNSETTLED. THIS WILL ALSO BE SLOW TO MOVE  
GIVEN THE EXPECTED DEVELOPMENT OF AN OMEGA BLOCK TYPE PATTERN  
UPSTREAM OVER THE EASTERN PACIFIC. LEAD MAIN WEATHER FEATURES  
INCLUDE A STRONG LOW PRESSURE SYSTEM FOR THE PLAINS AND UPPER  
MIDWEST TUE/WED, FOLLOWED BY WEAKER LOWS AND FRONTAL BOUNDARY  
MEANDERINGS FROM THE SOUTHWEST TO THE NORTHEAST U.S. LATER WEEK  
OVERTOP THE SOUTHEAST RIDGE. THE PATTERN OFFERS A PERIODIC LOCAL  
THREAT FOR STRONG TO SEVERE CONVECTION AND POTENTIAL FOR CELL  
TRAINING/EXCESSIVE RAINFALL.  
 
   
..WEATHER HIGHLIGHTS AND HAZARDS
 
 
THE MAIN THINGS THAT WILL MAKE WEATHER HEADLINES FOR THE SECOND  
HALF OF THE WEEK AND EXTENDING INTO NEXT WEEKEND WILL BE THE  
ANOMALOUS HEAT AND HUMIDITY BUILDING ACROSS THE SOUTHEASTERN  
QUADRANT OF THE NATION, THE UNSEASONABLY COOL WEATHER EXPECTED FOR  
THE INTERIOR WESTERN U.S. AND NORTHERN PLAINS, AND THE ONGOING  
THREAT OF HEAVY RAINFALL AND POTENTIAL SEVERE WEATHER ACROSS THE  
CENTRAL U.S. HIGH TEMPERATURES ARE FORECAST TO BE ON THE ORDER OF  
10 TO 15 DEGREES ABOVE LATE MAY AVERAGES FROM THE MIDWEST TO THE  
SOUTHEAST U.S., WITH THE HOTTEST READINGS EXPECTED FOR THE FRIDAY  
TO SUNDAY TIME PERIOD. THERE IS A GOOD CHANCE THAT THE FIRST 100  
DEGREE TEMPERATURES OF THE SEASON COULD BE REALIZED ACROSS INLAND  
PORTIONS OF SOUTHERN GEORGIA AND SOUTH CAROLINA. THE OPPOSITE  
WILL HOLD TRUE FOR THE WESTERN U.S. UNDER THE INFLUENCE OF THE  
UPPER LEVEL TROUGH, WITH DAYTIME HIGHS OF 15 TO 25 DEGREES BELOW  
NORMAL FOR MID-WEEK, AND THEN MODERATING TO 5 TO 15 DEGREES BELOW  
NORMAL BY THE END OF THE FORECAST PERIOD.  
 
D. HAMRICK  
 
ADDITIONAL 3-7 DAY HAZARDS INFORMATION CAN BE FOUND ON THE WPC  
MEDIUM RANGE HAZARDS CHART AT:  
HTTPS://WWW.WPC.NCEP.NOAA.GOV/THREATS/THREATS.PHP  
 
WPC MEDIUM RANGE 500MB HEIGHTS, SURFACE SYSTEMS, WEATHER GRIDS,  
QUANTITATIVE PRECIPITATION, WINTER WEATHER OUTLOOK PROBABILITIES  
AND HEAT INDICES ARE AT:  
 
HTTPS://WWW.WPC.NCEP.NOAA.GOV/MEDR/5DAYFCST500_WBG.GIF  
HTTPS://WWW.WPC.NCEP.NOAA.GOV/MEDR/5DAYFCST_WBG_CONUS.GIF  
HTTPS://WWW.WPC.NCEP.NOAA.GOV/5KM_GRIDS/5KM_GRIDSBODY.HTML  
HTTPS://WWW.WPC.NCEP.NOAA.GOV/QPF/DAY4-7.SHTML  
HTTPS://WWW.WPC.NCEP.NOAA.GOV/WWD/PWPF_D47/PWPF_MEDR.PHP?DAY=4  
HTTPS://WWW.WPC.NCEP.NOAA.GOV/HEAT_INDEX.SHTML  
 

 
 
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