513  
FXUS01 KWBC 301922  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
321 PM EDT SAT MAY 30 2020  
 
VALID 00Z SUN MAY 31 2020 - 00Z TUE JUN 02 2020  
 
...AN ENHANCED RISK OF SEVERE THUNDERSTORMS, SLIGHT RISK OF  
EXCESSIVE RAINFALL OVER PARTS OF THE PACIFIC NORTHWEST, CRITICAL  
FIRE WEATHER CONDITIONS IN THE GREAT BASIN...  
 
...THE NORTHERN ROCKIES AND PLAINS TO BASK IN HOT TEMPERATURES  
INTO THE START OF THE UPCOMING WEEK...  
 
...SEVERE THREAT IN THE NORTH CENTRAL REGION, HEAVY SHOWERS AND  
STRONG STORMS POSSIBLE IN TEXAS ON MONDAY...  
 
A POTENT UPPER-LEVEL LOW SLAMMING INTO CALIFORNIA THIS AFTERNOON  
WILL HEAD NORTH THIS EVENING WITH HEAVY SHOWERS AND THUNDERSTORMS  
DEVELOPING OUT AHEAD OF IT. THIS STORM SYSTEM IS RESPONSIBLE FOR  
SEVERAL WEATHER HAZARDS, MOST NOTABLY THE THREATS FOR SEVERE  
WEATHER AND EXCESSIVE RAINFALL. CENTRAL OREGON AND CENTRAL  
WASHINGTON ARE NOW UNDER BOTH SEVERE THUNDERSTORM AND FLASH FLOOD  
WATCHES THROUGH THIS EVENING. PARTS OF NORTHERN CALIFORNIA AND THE  
NORTHERN ROCKIES COULD ALSO CONTEND WITH HEAVY RAIN AND STRONG  
THUNDERSTORMS. IN ADDITION TO PRECIPITATION, STRONG WINDS ARE  
LIKELY ACROSS THE GREAT BASIN WHERE HIGH WIND WARNINGS AND WIND  
ADVISORIES ARE IN PLACE. THE COMBINATION OF BRISK WINDS AND LOW  
HUMIDITY LEVELS ARE A RECIPE FOR CRITICAL FIRE WEATHER CONDITIONS  
THROUGHOUT THE WEEKEND IN THE GREAT BASIN AND COLORADO RIVER  
VALLEY. THE STORM SYSTEM QUICKLY RACES NORTHWARD TONIGHT AND BY  
SUNDAY SCATTERED SHOWERS AND THUNDERSTORMS SHOULD BE CONFINED TO  
NORTHERN WASHINGTON, NORTHERN IDAHO, AND NORTHWEST MONTANA.  
 
ONE MORE DAY OF RECORD BREAKING HEAT IN THE SNAKE RIVER VALLEY  
THIS AFTERNOON BEFORE COOLER TEMPERATURES ARRIVE THROUGHOUT THE  
NORTHWEST ON SUNDAY. SIZZLING TEMPERATURES SET UP SHOP OVER THE  
NORTHERN AND CENTRAL ROCKIES AND HIGH PLAINS WHERE SOME DAILY  
RECORD HIGH TEMPS ARE POSSIBLE. A COUPLE DAILY RECORD HIGH TEMPS  
COULD ALSO BE SET IN THE ARIZONA DESERT AS EXCESSIVE HEAT WARNINGS  
CONTINUE INTO SUNDAY. THE REGIME OF MUCH ABOVE NORMAL TEMPERATURES  
HEADS EAST ON MONDAY WITH HEAT INDICES APPROACHING THE CENTURY  
MARK IN THE NORTHERN PLAINS AND UPPER MIDWEST. WHILE THE NORTH  
CENTRAL REGION BAKES THE GREAT LAKES, NORTHEAST, AND ON SOUTH INTO  
THE CAROLINAS WILL WITNESS SUBSTANTIALLY COOLER TEMPERATURES.  
DAILY TEMPERATURE DEPARTURES ARE FORECAST TO RANGE BETWEEN 5 TO 15  
DEGREES BELOW NORMAL BOTH SUNDAY AND MONDAY. SEASONALLY COOL  
CONDITIONS VERSUS NORMAL ARE ALSO BE POSSIBLE IN THE RIO GRANDE  
VALLEY AND ALONG THE WEST COAST.  
 
THE THREAT FOR SEVERE WEATHER AND HEAVY RAINFALL RETURNS TO THE  
NORTH CENTRAL U.S. ON MONDAY AS AN AREA OF LOW PRESSURE PASSES  
OVERHEAD. TO THE SOUTH, AREAS OF SHOWERS AND THUNDERSTORMS WILL  
DOT THE CENTRAL ROCKIES AND TEXAS WHERE HEAVY DOWNPOURS ARE  
POSSIBLE, ALONG WITH THE POTENTIAL FOR SOME SEVERE WEATHER. A  
SWATH OF HEAVY SHOWERS AND STRONG THUNDERSTORMS TRACK THROUGH THE  
GREAT LAKES LATE MONDAY.  
 
MULLINAX  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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