068  
FXUS01 KWBC 281938  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
237 PM EST SUN JAN 28 2018  
 
VALID 00Z MON JAN 29 2018 - 00Z WED JAN 31 2018  
 
...UNSETTLED WEATHER TO CONTINUE FOR THE PACIFIC NORTHWEST AS  
ANOTHER STORM SYSTEM ARRIVES...  
 
...SOME SNOW IS EXPECTED OVER THE CENTRAL APPALACHIANS AND ALSO  
PORTIONS OF THE MID-ATLANTIC AND SOUTHERN NEW ENGLAND...  
 
...VERY WARM AND DRY WEATHER WILL CONTINUE OVER THE SOUTHWEST U.S.  
WITH AN ELEVATED THREAT OF WILDFIRES...  
 
A COLD FRONT WILL CONTINUE TO ADVANCE GRADUALLY EAST AND OFFSHORE  
THE EASTERN SEABOARD BY EARLY MONDAY WHICH WILL ALLOW FOR MUCH  
COLDER TEMPERATURES TO FILTER SOUTHEAST FROM THE GREAT LAKES AND  
MIDWEST WHERE A MODIFYING AREA OF ARCTIC HIGH PRESSURE WILL BE  
FOCUSED. SOME ADDITIONAL RAIN IS EXPECTED IN THE MEANTIME THIS  
EVENING AND OVERNIGHT ACROSS AREAS OF THE MID-ATLANTIC AND  
SOUTHEAST UNTIL THE COLD FRONT CROSSES THE REGION. BY LATER  
MONDAY, A WEAK CLIPPER TYPE DISTURBANCE DROPPING SOUTHEAST FROM  
THE GREAT LAKES REGION WILL FOSTER AN AREA OF GENERALLY LIGHT SNOW  
ACROSS THE LOWER GREAT LAKES, UPPER OHIO VALLEY AND INTO THE  
CENTRAL APPALACHIANS. THIS SHOULD OVERSPREAD PARTS OF THE NORTHERN  
MID-ATLANTIC REGION THROUGH MONDAY NIGHT AND EARLY TUESDAY. SOME  
SNOWFALL IS ALSO POSSIBLE ON TUESDAY ACROSS COASTAL AREAS OF  
SOUTHERN NEW ENGLAND AS THIS SAME SYSTEM COUPLED WITH A  
STRENGTHENING AREA OF LOW PRESSURE OFFSHORE THE EAST COAST WILL  
WORK IN TANDEM TO BRING AT LEAST SOME POTENTIAL FOR ACCUMULATING  
SNOW. WHILE THIS SYSTEM WILL BE CLOSELY MONITORED, THE BULK OF THE  
ENERGY WITH THIS DEEPENING LOW CENTER IS EXPECTED TO REMAIN WELL  
OFFSHORE THE MID-ATLANTIC AND NORTHEAST.  
 
MUCH OF THE CENTRAL U.S. WILL BE CHILLY TO START OFF THE WEEK, BUT  
MUCH MILDER TEMPERATURES WILL BE ARRIVING ACROSS THE PLAINS BY  
TUESDAY AND WEDNESDAY WITH HIGH TEMPERATURES ON TUESDAY REACHING  
AS MUCH AS 20 TO 25 DEGREES ABOVE NORMAL. SOME AREAS ARE LIKELY TO  
SEE HIGH TEMPERATURES REACHING THE 60S AND EVEN THE LOW 70S. THIS  
ARRIVAL OF WARMER WEATHER WILL LARGELY BE DRIVEN BY THE ARRIVAL OF  
A STRONG PACIFIC STORM SYSTEM ACROSS THE PACIFIC NORTHWEST AND THE  
EASTWARD ADVANCE OF A STRONG AREA OF LOW PRESSURE ACROSS SOUTHERN  
CANADA THROUGH THE MIDDLE OF THE WEEK. THIS WILL BRING MILDER  
PACIFIC AIR WELL INLAND ACROSS THE CENTRAL AND WESTERN U.S. WITH  
MUCH OF THE ARCTIC AIR DISPLACED MUCH FARTHER NORTH UP ACROSS  
CANADA.  
 
THE ARRIVAL OF THE STORM SYSTEM ACROSS THE PACIFIC NORTHWEST WILL  
BE RESPONSIBLE FOR HEAVY RAIN ACROSS THE COASTAL RANGES OF  
WASHINGTON AND OREGON, AND AREAS OF THE OLYMPIC PENINSULA ARE  
EXPECTED TO SEE SEVERAL INCHES OF RAINFALL THAT MAY BE ENOUGH TO  
CAUSE SOME FLOODING CONCERNS. MEANWHILE, THIS STRONG INFLUX OF  
PACIFIC MOISTURE WILL RESULT IN SOME VERY HEAVY SNOWFALL FOR THE  
HIGHER TERRAIN OF THE WASHINGTON CASCADES WHERE AS MUCH AS 2 TO 4  
FEET OF NEW SNOWFALL IS EXPECTED. THE NORTHERN ROCKIES WILL SEE  
HEAVY SNOW AS WELL WITH AREAS OF THE BITTERROOTS LIKELY TO SEE AS  
MUCH AS 1 TO 2 FEET OF SNOW WITH THIS SYSTEM.  
 
FARTHER SOUTH ACROSS THE SOUTHWEST U.S., DRY WEATHER AND ABOVE  
AVERAGE TEMPERATURES WILL CONTINUE AS THE STORM TRACK ACROSS THE  
COUNTRY REMAINS WELL TO THE NORTH. HIGH PRESSURE WILL BE GENERALLY  
IN PLACE THROUGH THE MIDDLE OF THE WEEK ACROSS MOST OF THE GREAT  
BASIN AND THIS WILL ENCOURAGE DRY, WARM AND WINDY CONDITIONS  
ACROSS SOUTHERN CALIFORNIA AND ADJACENT AREAS OF ARIZONA. THESE  
CONDITIONS WILL ELEVATE THE FIRE DANGER, AND THUS THE THREAT OF  
WILDFIRES WILL NEED TO BE CLOSELY MONITORED.  
 
ORRISON  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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