628  
FXUS01 KWBC 112035  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
334 PM EST MON FEB 11 2019  
 
VALID 00Z TUE FEB 12 2019 - 00Z THU FEB 14 2019  
   
..MORE WIDESPREAD SNOWFALL MOVING INTO THE NORTHWESTERN U.S
 
 
...A WINTER STORM EXPECTED TO IMPACT MUCH OF THE NORTHERN TO  
NORTHEASTERN U.S...  
 
...HEAVY RAIN EXPECTED FOR THE MID-MISSISSIPPI, TENNESSEE, AND  
OHIO VALLEYS WHERE FLASH FLOODING IS POSSIBLE...  
 
A VERY ACTIVE WEATHER PATTERN IS EXPECTED TO IMPACT MANY AREAS  
ACROSS THE COUNTRY FOR THE NEXT FEW DAYS WITH TWO WINTER STORMS  
BREWING CONCURRENTLY. A LOW PRESSURE SYSTEM THAT DEVELOPED  
YESTERDAY ALONG AN ARCTIC FRONT OFF VANCOUVER ISLAND IS ALREADY  
BRINGING A NEW ROUND OF SNOW INTO THE PACIFIC NORTHWEST. WITH COLD  
AIR ALREADY IN PLACE OVER A FRESH SNOW COVER FROM THE PREVIOUS  
SNOWSTORM, CONDITIONS FAVOR ADDITIONAL SNOW TO ACCUMULATE EVEN  
DOWN INTO THE LOWER ELEVATIONS AS THE MOISTURE ASSOCIATED WITH THE  
LOW IS FORECAST TO LINGER THROUGH MUCH OF WEDNESDAY. THE HIGHER  
ELEVATIONS WILL SEE COPIOUS AMOUNTS OF SNOW, LIKELY MEASURED IN  
FEET, ALL ALONG THE CASCADES, AND ONCE AGAIN DOWN ALONG THE SIERRA  
NEVADA! THE INTERMOUNTAIN REGION INTO THE NORTHERN ROCKIES WILL  
LIKELY SEE 2 FEET OF SNOW AT THE HIGHEST ELEVATIONS THROUGH  
WEDNESDAY.  
 
BY WEDNESDAY, MOISTURE ASSOCIATED WITH THE LOW PRESSURE/FRONTAL  
SYSTEM CURRENTLY IMPACTING HAWAII WITH HIGH WINDS AND SIGNIFICANT  
WAVES IS FORECAST TO REACH NORTHERN CALIFORNIA. THIS SYSTEM WILL  
LIKELY BRING THE NEXT ROUND OF MODERATE TO HEAVY RAIN INTO  
CALIFORNIA ALONG WITH HEAVY SNOW ONCE AGAIN UP ACROSS THE HIGHER  
TERRAIN ON WEDNESDAY.  
 
MEANWHILE, A LOW PRESSURE SYSTEM DEVELOPING OVER THE CENTRAL  
PLAINS IS FORECAST TO BRING WIDESPREAD WINTRY WEATHER MOVING  
RAPIDLY ACROSS THE NORTHERN AND NORTHEASTERN U.S. DURING THE NEXT  
COUPLE OF DAYS. MORE THAN A FOOT OF SNOW IS FORECAST FOR UPPER  
MIDWEST WITH LESSER AMOUNTS OVER THE NORTHERN PLAINS AND INTO THE  
GREAT LAKES. THE STORM IS FORECAST TO BECOME MORE INTENSE ON  
TUESDAY AS IT HEADS TOWARDS NEW ENGLAND TUESDAY NIGHT. MORE THAN  
A FOOT OF SNOW IS FORECAST FOR NORTHERN NEW YORK AND NORTHERN NEW  
ENGLAND THROUGH WEDNESDAY AS THE STORM CENTER MOVES ACROSS THESE  
AREAS. IN ADDITION, SIGNIFICANT AMOUNTS OF SLEET AND FREEZING  
RAIN ARE ALSO EXPECTED FARTHER TO THE SOUTH FROM THE MIDWEST  
THROUGH THE LOWER GREAT LAKES, DOWN INTO THE CENTRAL APPALACHIANS  
AND INTO CENTRAL NEW ENGLAND.  
 
FARTHER TO THE SOUTH IN THE WARM SECTOR OF THE STORM SYSTEM, AN  
ENHANCED SOUTHERLY FLOW OF DEEP MOISTURE FROM THE GULF OF MEXICO  
WILL RESULT IN A SWATH OF HEAVY RAIN AND SOME THUNDERSTORMS FROM  
THE MID-MISSISSIPPI VALLEY ACROSS THE TENNESSEE AND OHIO VALLEYS  
THROUGH TUESDAY. FLASH FLOODING WILL BE POSSIBLE ACROSS SOME OF  
THESE AREAS AS ROUNDS OF HEAVY RAIN MOVE OVER THE SAME AREAS  
REPEATEDLY, AND WPC CURRENTLY HAS A SLIGHT TO MODERATE RISK OF  
EXCESSIVE RAINFALL FROM ARKANSAS TO SOUTHERN OHIO. SEVERAL INCHES  
OF RAINFALL WILL BE POSSIBLE FOR SOME AREAS BEFORE THE EVENT IS  
OVER BY TUESDAY EVENING. THE SOUTHERN APPALACHIANS COULD ALSO SEE  
SOME FLOODING ISSUES ON TUESDAY BEFORE THE STORM PULLS AWAY  
TUESDAY NIGHT.  
 
KONG/HAMRICK  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  
 

 
 
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