914  
FXUS01 KWBC 051935  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
234 PM EST FRI JAN 05 2018  
 
VALID 00Z SAT JAN 06 2018 - 00Z MON JAN 08 2018  
 
...AN ARCTIC OUTBREAK WILL KEEP TEMPERATURES 20 TO 30 DEGREES  
BELOW AVERAGE ACROSS THE NORTHEASTERN U.S...  
 
...WET CONDITIONS EXPECTED FROM NORTHERN CALIFORNIA INTO THE  
PACIFIC NORTHWEST...  
 
...A THREAT FOR ACCUMULATING ICE IS LIKELY OVER INTERIOR  
WASHINGTON/OREGON...  
 
FRIGID AIR IN PLACE OVER MUCH OF THE NORTHEAST AND MID-ATLANTIC  
WILL KEEP TEMPERATURES WELL-BELOW NORMAL THIS WEEKEND. LOCATIONS  
ACROSS THE NORTHEAST HAVE FORECAST TEMPERATURES THAT WILL AVERAGE  
20 TO 30 DEGREES THOSE NORMAL FOR EARLY JANUARY - WITH A PLETHORA  
OF LOCATIONS STRUGGLING TO GET ABOVE THE SINGLE DIGITS AND MAY  
RESULT IN DAILY RECORDS TO BE BROKEN. BRISK WINDS ACROSS THE  
REGION COMBINED WITH THIS ARCTIC AIRMASS WITH CREATE DANGEROUSLY  
COLD CONDITIONS. WIND CHILL WARNINGS AND ADVISORIES ARE IN EFFECT  
FROM MAINE TO NORTH CAROLINA. FRIGID TEMPERATURES ALSO EXTEND  
DOWN INTO THE SOUTHERN U.S. AS LOWS PLUNGE INTO THE 20S DOWN ALONG  
THE EASTERN GULF COAST AND INTO CENTRAL FLORIDA. MANY DAILY  
RECORDS MAY BE BROKEN ACROSS THIS SECTOR OF THE COUNTRY AS WELL.  
 
EXTREMELY COLD TEMPERATURES ALOFT MOVING OVER MANY UNFROZEN LAKE  
SURFACES WILL FOSTER THE DEVELOPMENT OF WIDESPREAD SNOW SHOWERS  
OVER ALL THE MAJOR GREAT LAKES. THE HEAVIEST SNOW IS EXPECTED TO  
BE SOUTHEAST OF LAKE ONTARIO WHICH WOULD AFFECT AREAS ANYWHERE  
FROM ROCHESTER TO SYRACUSE, NEW YORK.  
 
ONSHORE FLOW COMBINED WITH PACIFIC SYSTEMS APPROACHING THE  
NORTHWEST WILL KEEP MUCH OF WASHINGTON TO NORTHERN CALIFORNIA AND  
EAST TOWARD THE NORTHERN AND CENTRAL ROCKIES IN A WET PATTERN.  
COASTAL RAINS AND HIGHER ELEVATION SNOWS WILL CONTINUE THROUGH THE  
WEEKEND. A BROAD AREA OF 1 TO 2 INCHES OF PRECIPITATION IS  
FORECAST FOR THE WASHINGTON CASCADES. DURING THE NEXT COUPLE OF  
DAYS, MANY MOUNTAIN RANGES OVER THE WESTERN U.S. SHOULD SEE  
ACCUMULATING SNOWS WITH THE HIGHEST AMOUNTS LIKELY OVER THE  
COLORADO ROCKIES WITH THE POTENTIAL FOR OVER A FOOT. MEANWHILE,  
MARITIME FLOW OVERRIDING A SUB-FREEZING SURFACE LAYER SHOULD MAKE  
CONDITIONS FAVORABLE FOR FREEZING RAIN ACROSS SECTIONS OF  
CENTRAL/EASTERN WASHINGTON DOWN INTO EASTERN OREGON.  
 
A WARMING TREND IS EXPECTED FROM THE FOUR CORNERS REGION NORTHWARD  
TO THE HIGH PLAINS. DOWNSLOPING FLOW IS FORECAST TO BRING WELL  
ABOVE NORMAL TEMPERATURES FOR THESE LOCATIONS INTO THE WEEKEND. BY  
SATURDAY, EXPECT HIGHS TO REACH THE UPPER 40S UP INTO THE BLACK  
HILLS WHICH WOULD BE AROUND 15 TO 20 DEGREES ABOVE CLIMATOLOGY.  
 
MUCH OF THE CENTRAL U.S. MAY BE IMPACTED SUNDAY INTO MONDAY BY  
FREEZING RAIN AS A LOW PRESSURE SYSTEM DEVELOPS OVER THE SOUTHERN  
PLAINS AND LIFTS WARM GULF AIR INTO THE AREA WITH ARCTIC AIR. THE  
SWATH OF FREEZING RAIN IS MOST LIKELY TO SPAN FROM EASTERN KANSAS  
TO THE OHIO VALLEY, POSSIBLY SOUTH TOWARD THE ATLANTA AREA. IF  
THIS MATERIALIZES, WIDESPREAD DISRUPTION TO TRANS PORTION MAY  
OCCUR.  
 
CAMPBELL/RUBIN-OSTER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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