Prognostic Meteorological Discussion
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000 FXUS01 KWBC 200755 PMDSPD SHORT RANGE FORECAST DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 254 AM EST SAT JAN 20 2018 VALID 12Z SAT JAN 20 2018 - 12Z MON JAN 22 2018 ...PRECIPITATION TO SPREAD SOUTHWESTERN U.S. THIS WEEKEND... ...HEAVY SNOWS POSSIBLE FOR PORTIONS OF THE GREAT BASIN NORTHERN AND CENTRAL ROCKIES SATURDAY... ...STRONG WINTER STORM EXPECTED TO DEVELOP OVER THE CENTRAL U.S. BY SUNDAY... ...ABOVE NORMAL TEMPERATURES PERSISTING ACROSS THE EAST... A WELL-DEFINED COLD FRONT AND ITS ASSOCIATED AREA OF PRECIPITATION WILL CONTINUE TO PUSH SOUTHEAST INTO THE SOUTHWESTERN U.S. A VAST AREA SPANNING FROM THE SIERRA NEVADAS, NORTHERN ARIZONA AND NORTHWARD TO THE ROCKIES IN COLORADO WILL HAVE A MIX OF RAIN AND SNOW TODAY, TURNING TO MOSTLY SNOW BY THIS EVENING AND THROUGH SUNDAY. THE HEAVIEST SNOW ACCUMULATIONS WILL LIKELY OCCUR OVER THE MOUNTAINS OF SOUTHWEST WYOMING, UTAH AND EASTERN NEVADA THIS AFTERNOON. AND AS THE FRONT PROGRESSES EASTWARD, SO WILL THE HEAVIEST PRECIPITATION. LOCALLY HEAVY SNOW IS FORECAST FOR THE CENTRAL AND SOUTHERN ROCKIES. AN AREA OF LOW PRESSURE IS EXPECTED TO STRENGTHEN OVER THE SOUTHERN HIGH PLAINS TONIGHT AND THEN TRACK NORTHEAST INTO MIDWEST. IN THE COLD SECTOR, AN EXPANSIVE SHIELD OF SNOW WILL SPAN FROM THE ROCKIES INTO THE CENTRAL HIGH PLAINS BY TONIGHT, REACHING THE UPPER MIDWEST ON SUNDAY. SNOWFALL INTENSITY WILL BE MODERATE TO HEAVY AT TIMES AND ACCOMPANIED BY GUSTY WINDS. A WINTER STORM WATCH IS IN EFFECT FOR EASTERN WYOMING AND COLORADO TO NORTHERN WISCONSIN. FURTHER SOUTH AND AHEAD OF THE LOW`S TRAILING COLD FRONT, EXPECT SHOWERS AND THUNDERSTORMS TO DEVELOP, INCREASING IN COVERAGE AND INTENSITY ACROSS EASTERN OKLAHOMA AND TEXAS INTO THE MID AND LOWER MISSISSIPPI VALLEY SUNDAY AFTERNOON AND EVENING. AN ACTIVE WET PATTERN WILL PERSIST THIS WEEKEND AND INTO EARLY NEXT ACROSS THE PACIFIC NORTHWEST. A COUPLE OF FRONTS WILL PASS THROUGH THE REGION, SPREADING WIDESPREAD RAIN AND MOUNTAIN SNOW AS IT HEADS TOWARD THE INTERMOUNTAIN WEST. HEAVY SNOW WILL BE POSSIBLE FOR PORTIONS OF THE CASCADES OVER THE NEXT FEW DAYS. TEMPERATURES WILL BE NEAR OR BELOW NORMAL ACROSS THE WESTERN STATES. FOR MUCH OF THE EAST COAST, EXPECT ABOVE NORMAL TEMPERATURES TO STICK AROUND FOR A FEW DAYS. NUMEROUS LOCATIONS WILL HAVE MAXIMUM TEMPERATURES REMAINING 10-20 DEGREES ABOVE THEIR CLIMATOLOGICAL NORMS. CAMPBELL/PEREIRA GRAPHICS AVAILABLE AT WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP $$

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