361  
FXUS01 KWBC 301950  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
249 PM EST WED JAN 30 2019  
 
VALID 00Z THU JAN 31 2019 - 00Z SAT FEB 02 2019  
 
...DANGEROUS WIND CHILLS ACROSS THE UPPER MIDWEST AND INTO THE  
OHIO VALLEY EXPECTED TO LAST THROUGH THURSDAY...  
   
..HEAVY SNOW DOWNWIND OF THE GREAT LAKES
 
 
...HEAVY RAIN AND HIGH ELEVATION SNOW WILL RAMP UP ACROSS  
CALIFORNIA IN THE NEXT FEW DAYS...  
 
AN UPPER LEVEL LOW CENTERED OVER THE GREAT LAKES DRIVING THE BLAST  
OF ARCTIC AIR FROM THE UPPER MIDWEST EASTWARD INTO THE OHIO  
VALLEY, MID-ATLANTIC AND NORTHEAST WILL STAY PUT THROUGH TOMORROW.  
WIND CHILL VALUES OVER THE UPPER MIDWEST WILL CONTINUE TO BE IN  
THE -40S THROUGH THURSDAY MORNING, WITH ACTUAL TEMPERATURES IN THE  
-20S TO -30S. IN THE NORTHEAST, TEMPERATURES WILL PLUMMET TO JUST  
BELOW ZERO, AND THE MID-ATLANTIC WILL SEE SINGLE DIGIT  
TEMPERATURES. THESE APPARENT TEMPERATURES ARE CREATING LIFE  
THREATENING CONDITIONS, AS FROSTBITE CAN OCCUR QUICKLY AND EVEN  
HYPOTHERMIA OR DEATH IF PRECAUTIONS ARE NOT TAKEN. WIND CHILL  
WARNINGS AND ADVISORIES ARE IN EFFECT THROUGH THURSDAY AFTERNOON  
ACROSS ALL THESE REGIONS--TAKE EXTRA PRECAUTIONS AND VISIT YOUR  
LOCAL NWS WEBSITE FOR MORE INFORMATION (WWW.WEATHER.GOV). BY  
THURSDAY AFTERNOON, THE UPPER LOW WILL SHIFT NORTH--RELAXING THE  
COLD, ARCTIC GRIP AND A GRADUAL WARM-UP WILL BE EXPECTED.  
 
ANOTHER CONSEQUENCE OF THE UPPER LOW OVER THE GREAT LAKES IS  
CYCLONIC FLOW OVER THE GREAT LAKES. THIS WILL GIVE WAY TO HEAVY  
LAKE EFFECT SNOW DOWNWIND OF THE LAKES. DOWNWIND OF LAKE ONTARIO,  
SNOWFALL TOTALS OF 3 TO 4 FEET IN THE MOST PERSISTENT SNOWS IS  
POSSIBLE. COMBINING THIS WITH STRONG WINDS, BLIZZARD CONDITIONS  
ARE EXPECTED WHERE THERE ARE CURRENTLY BLIZZARD WARNINGS IN  
EFFECT. ELSEWHERE, SNOWFALL AMOUNTS RANGING FROM 2 TO 10 INCHES  
DOWNWIND OF THE OTHER GREAT LAKES WILL OCCUR THROUGH THURSDAY.  
HOWEVER, KEEP IN MIND THESE AREAS ARE ALSO EXPERIENCING DANGEROUS  
WIND CHILLS. TAKE EXTRA PRECAUTIONS IF TRAVELING.  
 
A CLOSED MID-LEVEL LOW APPROACHING THE WEST COAST WILL BEGIN TO  
SKIRT THE CENTRAL CALIFORNIA COAST BY THURSDAY MORNING. THIS WILL  
BRING HEAVY RAINFALL PARTICULARLY TO THE SOUTHERN CALIFORNIA AREA  
ALONG WITH LIGHT SNOWFALL IN THE TRANSVERSE MOUNTAINS. THERE IS  
SOME INSTABILITY EXPECTED WITH THIS SYSTEM, SO EMBEDDED  
THUNDERSTORMS WILL BE POSSIBLE AND COULD LEAD TO ENHANCED RAINFALL  
TOTALS. THIS AREA HAS BURN SCARS FROM THE RECENT FIRES--THUS THERE  
IS A SLIGHT RISK OF EXCESSIVE RAINFALL POSSIBLE ON THURSDAY.  
ANOTHER PACIFIC SYSTEM WILL BEGIN TO APPROACH THE WEST COAST ON  
FRIDAY NIGHT AND INTO SATURDAY--WHICH WILL BRING HEAVIER RAINFALL  
AND HEAVY SNOW ALONG THE SIERRA NEVADA BEYOND THE SHORT TERM  
PERIOD.  
 
REINHART  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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