404  
FXUS01 KWBC 081947  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
247 PM EST MON JAN 08 2018  
 
VALID 00Z TUE JAN 09 2018 - 00Z THU JAN 11 2018  
 
...POTENTIAL FOR MUDSLIDES AND OTHER HYDROLOGIC ISSUES ALONG THE  
CALIFORNIA COAST, ESPECIALLY WHERE BURN SCARS EXIST FROM PREVIOUS  
WILDFIRES...  
 
...WIDESPREAD THREAT FOR FREEZING RAIN EXTENDS FROM THE ATLANTA  
METRO AREA UP TO THE CENTRAL APPALACHIANS AND MID-ATLANTIC...  
 
...MILDER CONDITIONS TO PREVAIL OVER MUCH OF THE COUNTRY AS ARCTIC  
AIR RETREATS...  
 
AN EXPANSIVE SWATH OF PRECIPITATION IS SPANNING FROM THE CENTRAL  
GULF COAST TO THE NORTHEAST TODAY AS A PAIR OF DISTURBANCES SWEEP  
THROUGH. THE WARM, MOIST AIR OVERRIDING THE SHALLOW COLD AIRMASS  
IS RESULTING IN WIDESPREAD FREEZING RAIN AND SLEET, ESPECIALLY  
ALONG THE CENTRAL APPALACHIANS AND THE MID-ATLANTIC REGION.  
HAZARDOUS DRIVING CONDITIONS WILL QUICKLY ARISE AS PRECIPITATION  
FREEZES AND ACCUMULATIONS ON ROADS AND BRIDGES - PARTICULARLY OVER  
UNTREATED ROADS. NUMEROUS WINTER WEATHER ADVISORIES ARE IN EFFECT  
FROM NORTH CAROLINA TO PENNSYLVANIA AND NEW JERSEY.  
 
HEAVY RAINFALL IS EXPECTED OVER THE NEXT COUPLE OF DAYS FOR  
SOUTHERN CALIFORNIA AS A STRENGTHENING PACIFIC SYSTEM PUSHES  
INLAND. HEAVY RAINFALL SHOULD SPREAD FROM NORTH TO SOUTH - WITH A  
BROAD AREA OF 2 TO 4 INCHES OF RAIN IS EXPECTED FROM COASTAL  
NORTHERN CALIFORNIA DOWN TOWARD THE LOS ANGELES BASIN. LOCAL  
OROGRAPHICS COULD EASILY AUGMENT THESE AMOUNTS WHERE FAVORABLE  
UPSLOPE FLOW WILL INCREASE RAINFALL RATES. A MAJOR ISSUE WILL BE  
THE BURN SCAR AREAS AFTER A VERY ACTIVE FIRE SEASON TO CONCLUDE  
THE YEAR 2017. THESE REGIONS IN PARTICULAR WILL BE SUSCEPTIBLE TO  
MUDSLIDES, DEBRIS FLOWS, OR OTHER HYDRO LOGIC ISSUES GIVEN THE  
HEAVY RAINFALL EXPECTED. FARTHER INLAND, THE PACIFIC STORM SHOULD  
BE MORE WINTRY IN NATURE AS 12 TO 18 INCHES OF SNOW IS LIKELY OVER  
THE SOUTHERN/CENTRAL SIERRA NEVADA RANGES.  
 
RAIN AND SNOW WILL SPREAD FROM THE PACIFIC NORTHWEST ACROSS THE  
NORTHERN AND CENTRAL ROCKIES AND INTO THE ADJACENT HIGH PLAINS AS  
PACIFIC SYSTEM TRACKS INLAND. HEAVY SNOW WILL BE POSSIBLE FOR THE  
HIGHER TERRAIN OF IDAHO, MONTANA AND WYOMING. TEMPERATURES ACROSS  
MUCH OF THE CONUS WILL WARM UP TO NEAR, OR ABOVE, SEASONAL AVERAGE  
TEMPERATURES AS THE ARCTIC AIRMASS MODERATES. BY TUESDAY, HIGH  
TEMPERATURES MAY EXCEED 20 DEGREES ABOVE CLIMATOLOGY ACROSS THE  
CENTRAL/SOUTHERN HIGH PLAINS AS READINGS MOVE INTO THE UPPER 60S  
TO LOW/MID 70S.  
 
CAMPBELL/RUBIN-OSTER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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