764  
FXUS01 KWBC 050745  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
245 AM EST MON FEB 05 2018  
 
VALID 12Z MON FEB 05 2018 - 12Z WED FEB 07 2018  
 
...A NEW THREAT OF HEAVY RAIN WILL BE DEVELOPING FOR THE LOWER  
MISSISSIPPI AND TENNESSEE VALLEYS TOWARD THE MIDDLE OF THE WEEK...  
 
...MORE SNOW AND SOME ICE WILL BE SETTING UP ACROSS THE OHIO  
VALLEY AND THE NORTHEAST AS A NEW STORM IMPACTS THE EASTERN U.S IN  
THE COMING DAYS...  
 
...MILD TEMPERATURES CONTINUE OVER MOST OF THE WESTERN U.S. WHILE  
FRIGID WEATHER REMAINS EAST OF THE ROCKIES...  
 
MORE TRANQUIL WEATHER IS EXPECTED ACROSS THE SOUTHERN AND EASTERN  
U.S. TODAY AS WE START OFF THE NEW WEEK. DRIER AND NOTABLY COLDER  
CONDITIONS WILL BE NOTED ACROSS THESE AREAS AS HIGH PRESSURE OVER  
THE OHIO VALLEY SHIFTS QUICKLY TOWARD THE MID-ATLANTIC REGION BY  
TONIGHT. HOWEVER, THE DRY WEATHER WILL BE SHORT-LIVED AS ENERGY  
ADVANCING SOUTHEAST FROM THE NORTHWEST U.S. AND OUT ACROSS THE  
PLAINS BEGINS TO ORGANIZE AN AREA OF LOW PRESSURE ACROSS THE LOWER  
MISSISSIPPI VALLEY REGION BY LATE TUESDAY. THIS DEVELOPING WAVE OF  
LOW PRESSURE WILL TAP PLENTY OF MOISTURE FROM THE GULF OF MEXICO  
AND THE RESULT WILL BE THE DEVELOPMENT OF WIDESPREAD HEAVY RAIN  
AND SOME THUNDERSTORM ACTIVITY ACROSS PARTS OF THE LOWER  
MISSISSIPPI AND TENNESSEE VALLEYS LATE TUESDAY THROUGH EARLY  
WEDNESDAY. LOCALLY AS MUCH AS A FEW INCHES OF RAIN WILL BE  
POSSIBLE ACROSS THESE LOCATIONS AND AS A RESULT THERE MAY BE SOME  
RUNOFF CONCERNS AND POSSIBLE FLOODING. THIS STORM SYSTEM WILL BE  
LIFTING NORTHEAST ACROSS THE TENNESSEE VALLEY AND MID-ATLANTIC  
REGION THROUGH WEDNESDAY, AND ULTIMATELY THIS WILL BRING  
WIDESPREAD PRECIPITATION TO AREAS OF THE OHIO VALLEY, MID-ATLANTIC  
AND NORTHEAST THROUGH LATE WEDNESDAY. HEAVY SNOWFALL ALONG WITH A  
NARROW STRIPE OF ICE CAN BE EXPECTED NORTH AND WEST OF THE LOW  
TRACK AND AREAS OF THE NORTHERN MID-ATLANTIC REGION AND INTERIOR  
NORTHEAST WILL SEE THE HEAVIEST SNOWFALL WITH SOME AREAS SEEING AS  
MUCH AS 6 TO 12 INCHES. FARTHER SOUTH, THERE WILL BE PLENTY OF  
SHOWER AND SOME THUNDERSTORM ACTIVITY FOR THE SOUTHEAST AND SPREAD  
OUT ACROSS THE GULF COAST STATES.  
 
AREAS OF THE PACIFIC NORTHWEST, AND THE NORTHERN AND CENTRAL  
ROCKIES WILL CONTINUE TO SEE SOME ADDITIONAL UNSETTLED WEATHER AT  
LEAST INTO EARLY TUESDAY, BUT THE DEEPER FETCH OF PACIFIC MOISTURE  
THAT HAS BEEN IMPACTING THIS REGION OVER THE LAST SEVERAL DAYS  
SHOULD BEGIN TO THIN OUT WHICH WILL END THE THREAT OF HEAVY RAIN  
AND SNOW. REGARDLESS, THERE WILL STILL BE AS MUCH AS AN ADDITIONAL  
FOOT OF SNOW ACROSS PARTS OF THE WASHINGTON CASCADES, AND THE  
INTERIOR RANGES OF THE NORTHERN ROCKIES INCLUDING THE BITTERROOTS.  
SOME HEAVY SNOW WILL ALSO BE POSSIBLE AT LEAST FOR TODAY ACROSS  
THE WESTERN AND NORTHERN COLORADO HIGH COUNTRY. THE REMAINDER OF  
THE WESTERN U.S. WILL OTHERWISE START OFF THE WEEK VERY MILD AND  
DRY WITH TEMPERATURES ESPECIALLY OVER THE GREAT BASIN AGAIN AS  
MUCH AS 10 TO 20 DEGREES ABOVE NORMAL.  
 
MEANWHILE, THE AREA EAST OF THE SPINE OF THE CENTRAL AND NORTHERN  
ROCKIES AND ESPECIALLY ACROSS THE NORTHERN PLAINS AND UPPER  
MIDWEST WILL BE SEEING TEMPERATURES THAT ARE MUCH COLDER AS THIS  
PART OF THE COUNTRY WILL CONTINUE TO SEE INTRUSIONS OF ARCTIC AIR  
DROPPING SOUTH FROM CANADA. THIS WILL FOSTER TEMPERATURES LOCALLY  
AS MUCH AS 10 TO 20 DEGREES BELOW NORMAL WITH ACTUAL DAYTIME  
READINGS IN SOME CASES STRUGGLING TO GET OUT OF THE SINGLE DIGITS.  
OVERNIGHT LOWS WILL BE AS MUCH AS 20 DEGREES BELOW ZERO.  
 
ORRISON  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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