Prognostic Meteorological Discussion
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FXUS01 KWBC 180738
PMDSPD

SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
237 AM EST THU JAN 18 2018

VALID 12Z THU JAN 18 2018 - 12Z SAT JAN 20 2018

...AFTER A COLD START ACROSS THE DEEP SOUTH, WARMER WEATHER WILL
SPREAD EASTWARD FROM THE PLAINS AS THE WEEKEND APPROACHES...

...COOLER AND UNSETTLED WEATHER FOR THE WESTERN U.S. THROUGH
SATURDAY MORNING...

AFTER THURSDAY MORNING LOWS IN THE TEENS FOR MANY LOCATIONS
EXTENDING FROM EASTERN TEXAS TO THE CENTRAL GULF COAST, WARMER
WEATHER IS ON THE WAY. HIGH PRESSURE CURRENTLY SITUATED OVER THE
LOWER MISSISSIPPI RIVER VALLEY WILL SLOWLY SHIFT EAST OVER THE
NEXT TWO DAYS, ALLOWING A SOUTHWESTERLY WIND TO BRING IN WARMER
AIR FROM THE PLAINS AND GULF OF MEXICO. HIGHS ACROSS THE DEEP
SOUTH WILL STILL BE 10 TO 20 DEGREES BELOW AVERAGE TODAY, BUT ARE
EXPECTED TO BE NEAR TO ABOVE AVERAGE FOR SATURDAY. FOR SATURDAY,
HIGH TEMPERATURES IN OKLAHOMA, TEXAS AND LOUISIANA SHOULD WARM UP
INTO THE 60S AND 70S, A SIGNIFICANT CHANGE FROM THE SNOW AND ICE
EXPERIENCED EARLIER IN THE WEEK.

AFTER THE DEPARTURE OF A WINTER STORM FROM THE MID-ATLANTIC COAST
THIS MORNING, MOST LOCATIONS EAST OF THE ROCKIES WILL BE DRY
THROUGH SATURDAY MORNING, EXCEPT FOR LIGHT SNOW IN THE VICINITY OF
THE GREAT LAKES AND SOME SHOWERS OVER THE EASTERN HALF OF TEXAS
INTO LOUISIANA ON FRIDAY AND SATURDAY.

OUT WEST, A CHANGE IN THE UPPER PATTERN WILL ALLOW FOR THE
INFILTRATION OF COLDER, PACIFIC AIR ALONG WITH RAIN AND HIGHER
ELEVATION SNOW DEVELOPING THROUGH THE REST OF THE WEEK. RAIN
ASSOCIATED WITH A COLD FRONT WILL CONTINUE TO MOVE INLAND TODAY,
BUT AS COLDER AIR FLOWS IN BEHIND THE COLD FRONT, A RAIN/SNOW MIX
IS EXPECTED TO DEVELOP ACROSS SOME OF THE HIGHER ELEVATIONS OF
CALIFORNIA, OREGON AND IDAHO. BY SATURDAY MORNING, MANY INLAND
LOCATIONS WILL BE SNOWING WITH RAIN LIMITED TO INLAND VALLEYS AND
COASTAL LOCATIONS ALONG THE WEST COAST. SOME MORE SIGNIFICANT
SNOWFALL ACCUMULATIONS ARE POSSIBLE FOR PORTIONS OF NEVADA INTO
UTAH BEGINNING FRIDAY AND LASTING INTO SATURDAY, WITH WINTER STORM
WATCHES ALREADY IN PLACE OVER PARTS OF NORTHEASTERN NEVADA.
NEEDLESS TO SAY, TEMPERATURES WILL BE FALLING BELOW AVERAGE WEST
OF THE ROCKIES BY SATURDAY.

OTTO


GRAPHICS AVAILABLE AT
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
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