753  
FXUS01 KWBC 190808  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
307 AM EST SAT JAN 19 2019  
 
VALID 12Z SAT JAN 19 2019 - 12Z MON JAN 21 2019  
 
...MAJOR WINTER STORM EXPECTED TO MOVE RAPIDLY ACROSS THE MIDWEST  
INTO THE NORTHEAST THIS WEEKEND...  
 
...SEVERE WEATHER AND FLASH FLOODING ARE POSSIBLE IN THE  
SOUTHEAST...  
 
...HEAVY RAIN LIKELY FOR THE PACIFIC NORTHWEST INTO CALIFORNIA  
THIS WEEKEND, WITH HEAVY SNOW IN HIGHER ELEVATIONS OF THE  
NORTHWEST...  
 
A SIGNIFICANT LOW PRESSURE SYSTEM IS TAKING SHAPE OVER THE CENTRAL  
PLAINS THIS SATURDAY MORNING. COMBINING WITH A SURGE OF ARCTIC  
AIR FROM CANADA, THIS STORM IS EXPECTED TO SPREAD HEAVY WINTRY  
PRECIPITATION FROM THE OHIO VALLEY NORTHEASTWARD THROUGH NEW  
ENGLAND FOR THE REST OF THE WEEKEND. THE STORM IS FORECAST TO  
MOVE AT A RAPID PACE ACROSS THE EASTERN HALF OF THE COUNTRY.  
NEVERTHELESS, THE ABUNDANCE OF MOISTURE AND THE VIGOROUS DYNAMICS  
OF THE STORM WILL BRING MORE THAN A FOOT OF SNOW FROM ACROSS  
NORTHERN PENNSYLVANIA AND MUCH OF UPSTATE NEW YORK INTO MUCH OF  
INTERIOR NEW ENGLAND. THE FORECAST STORM TRACK HAS BEEN TRENDING  
FARTHER NORTH OVER THE PAST FEW DAYS. LOCATIONS ALONG I-95 OVER  
THE MID-ATLANTIC ARE NOW EXPECTED TO SEE MOSTLY RAIN THROUGH THE  
EVENT WHILE MIXED PRECIPITATION IS EXPECTED FARTHER NORTH ACROSS  
SOUTHERN NEW ENGLAND. THE CENTRAL APPALACHIANS CAN EXPECT TO SEE  
UP TO A QUARTER OF AN INCHES OF ICE WHILE LESSER AMOUNTS ARE  
EXPECTED FARTHER WEST ACROSS THE OHIO VALLEY. AS THE LOW PRESSURE  
SYSTEM GETS MORE INTENSE EARLY ON SUNDAY, WINDS ACROSS NEW ENGLAND  
WILL BECOME STRONG AND GUSTY WITH HEAVY SNOW DURING THE HEIGHT OF  
THE STORM. MEANWHILE, RAIN COULD BECOME HEAVY ACROSS THE  
MID-ATLANTIC SPREADING TOWARDS SOUTHERN NEW ENGLAND SUNDAY MORNING  
WITH MILD TEMPERATURES BEFORE ARCTIC AIR RUSHES IN BEHIND A STRONG  
COLD FRONT. BLUSTERY NORTHWESTERLY WINDS WILL USHER IN THE  
COLDEST AIR SO FAR THIS SEASON INTO MUCH OF THE EASTERN SEABOARD  
WITH READINGS DIPPING TO NEAR ZERO OVER INTERIOR NEW ENGLAND,  
LOWER TEENS OVER THE INTERIOR MID-ATLANTIC!  
 
FARTHER SOUTH, THE STRONG DYNAMICS AHEAD OF THE STRONG COLD FRONT  
WILL BRING STRONG TO SEVERE THUNDERSTORMS TODAY ACROSS THE DEEP  
SOUTH FROM THE LOWER MISSISSIPPI EASTWARD INTO THE SOUTHEAST.  
 
IN THE WEST, ABUNDANT MOISTURE AND DYNAMICS ASSOCIATED A STRONG  
LOW PRESSURE SYSTEM IS IMPACTING THE PACIFIC NORTHWEST WITH  
MODERATE TO HEAVY RAIN AND INLAND MOUNTAIN SNOW. BY SUNDAY,  
MOISTURE FROM THE NEXT PACIFIC SYSTEM WILL IMPACT AREAS FARTHER  
SOUTH FROM OREGON DOWN INTO NORTHERN CALIFORNIA, WITH SNOW  
PENETRATING FURTHER INLAND ACROSS THE HIGHER ELEVATIONS OF THE  
NORTHERN ROCKIES. BY EARLY ON MONDAY, A LOW PRESSURE SYSTEM IS  
FORECAST TO TAKE SHAPE ACROSS THE GREAT BASIN WHERE SNOW SHOULD  
BECOME MORE WIDESPREAD INTO THE NORTHERN AND CENTRAL ROCKIES.  
 
KONG  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  
 

 
 
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