381  
FXUS01 KWBC 251841  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
140 PM EST THU JAN 25 2018  
 
VALID 00Z FRI JAN 26 2018 - 00Z SUN JAN 28 2018  
 
...A SERIES OF STORMS SYSTEM ARRIVING IN OFF THE PACIFIC OCEAN  
WILL KEEP MUCH OF THE WEST UNSETTLED WITH MORE RAIN AND SNOW...  
 
...SHOWERS AND THUNDERSTORMS TO ARRIVE ACROSS THE GULF COAST  
STATES AND SOUTHEAST THIS WEEKEND...  
 
...MILDER TEMPERATURES ARRIVING ACROSS THE EAST AS COLDER AIR  
DIVES DOWN ACROSS THE UPPER MIDWEST...  
 
HIGH PRESSURE INITIALLY FOCUSED ALONG THE EASTERN SEABOARD WILL  
GRADUALLY ADVANCE EAST AND OFFSHORE BY THIS WEEKEND WHICH WILL  
ALLOW FOR WARMER SOUTHERLY WINDS TO RETURN ACROSS THE EASTERN U.S.  
OUT AHEAD OF A COLD FRONT DROPPING SOUTHEAST ACROSS THE MIDWEST.  
AFTERNOON HIGH TEMPERATURES WILL LARGELY BE ABOVE AVERAGE FOR LATE  
JANUARY WITH TEMPERATURES RANGING FROM THE 40S ACROSS SOUTHERN  
PORTIONS OF THE NORTHEAST, 50S TO LOW 60S OVER THE MID-ATLANTIC,  
AND INTO THE 60S OVER THE SOUTHEAST. FLORIDA WILL BE THE WARMEST  
WITH TEMPERATURES WELL INTO THE 70S. MUCH OF THE CENTRAL AND  
EASTERN U.S. WILL BE DRY THROUGH THE END OF WEEK, HOWEVER BY  
SATURDAY AND SUNDAY, THE AFOREMENTIONED COLD FRONT WILL GRADUALLY  
BE CROSSING THE GULF COAST STATES AND AIMING FOR THE SOUTHEAST  
WHICH WILL BRING A SUBSTANTIAL INCREASE IN CLOUDS AND A GOOD  
THREAT OF SHOWERS AND THUNDERSTORMS WHICH WILL BE CAPABLE OF  
PRODUCING LOCALLY HEAVY RAINFALL.  
 
IN BEHIND THE COLD FRONT SETTLING SOUTHEAST ACROSS THE MIDWEST AND  
PLAINS, TEMPERATURES WILL TURN MUCH COLDER AND TRENDING TO NEAR OR  
BELOW NORMAL. THE COLDEST TEMPERATURES WILL BE ACROSS THE UPPER  
MIDWEST WHERE HIGH TEMPERATURES BY SUNDAY WILL BE IN THE TEENS TO  
NEAR 20 DEGREES. PRECIPITATION CHANCES WILL MAINLY BE CONFINED TO  
AREAS OF THE LOWER AND MIDDLE MISSISSIPPI VALLEY AND THROUGH THE  
OHIO VALLEY AND GREAT LAKES IN ASSOCIATION WITH THE PASSAGE OF THE  
COLD FRONT WHERE A BROKEN AXIS OF RAIN SHOWERS ARE EXPECTED.  
 
A MAJORITY OF THE WEST COAST, GREAT BASIN AND INTERMOUNTAIN REGION  
WILL REMAIN IN A WET PATTERN AS THE CURRENT STORM SYSTEM THAT IS  
MOVING INLAND AND BRINGING WIDESPREAD RAIN AND SNOW IS EXPECTED TO  
BE REPLACED BY ANOTHER STORM SYSTEM BY LATER FRIDAY NIGHT AND  
SATURDAY WITH A FOCUSED IMPACT ON THE PACIFIC NORTHWEST AND  
NORTHERN ROCKIES. THIS WILL BRING COLDER TEMPERATURES AND A  
RENEWED SURGE OF PACIFIC MOISTURE FOR HEAVY RAINS OVER THE COASTAL  
RANGES AND SIGNIFICANT SNOWFALL FOR THE HIGHER ELEVATIONS,  
INCLUDING THE CASCADES AND FAVORED TERRAIN OF THE NORTHERN ROCKIES  
INCLUDING THE SAWTOOTH, BITTERROOTS AND TETONS. ADDITIONAL  
SNOWFALL ACCUMULATIONS GOING THROUGH THE WEEKEND WILL BE ON THE  
ORDER OF 1 TO 3 FEET LOCALLY, WITH THE HEAVIEST AMOUNTS EXPECTED  
OVER THE WASHINGTON CASCADES.  
 
ORRISON  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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