Area Forecast Discussion
Issued by NWS Rapid City, SD

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000
FXUS63 KUNR 232145
AFDUNR

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
245 PM MST TUE DEC 23 2014

.SHORT TERM...THIS EVENING THROUGH WEDNESDAY NIGHT
ISSUED AT 240 PM MST TUE DEC 23 2014

STACKED LOW SPINS OVER IA/WI...AND UPPER RIDGE BUILDS IN OVER THE
WESTERN CONUS. PRESSURE GRADIENT REMAINS TIGHT ACROSS THE NORTHERN
PLAINS BETWEEN THE EXITING LOW AND THE INCOMING HIGH
PRESSURE...CREATING SOME STRONG NORTHWESTERLY WINDS. MUCH OF THE
SNOW HAS DIMINISHED...AND SKIES ARE GRADUALLY CLEARING FROM THE
WEST. VISIBILITIES ARE IMPROVING...AND SO ALL HEADLINES HAVE BEEN
CANCELLED. TEMPS ARE IN THE UPPER 20S TO LOWER 30S.

PRESSURE GRADIENT WILL SLACKEN TONIGHT AND WINDS WILL DECREASE.
UNDER PARTLY CLOUDY SKIES...LOWS WILL BE IN THE TEENS.

UPPER RIDGING WILL BRIEFLY MOVE OVER THE NORTHERN PLAINS ON
WEDNESDAY...WHILE A CANADIAN LOW PRESSURE SYSTEM WILL DRAG A WARM
FRONT THROUGH THE REGION. WINDS WILL BECOME SOUTHWESTERLY AND ADVECT
IN WARMER AIR. NEW SNOW COVER WILL LIMIT MOST AREAS TO THE 30S
AND LOW 40S...ALTHOUGH THE EASTERN FOOTHILLS WILL BENEFIT FROM
DOWNSLOPING AND REACH THE MID 40S.

CLOUDS WILL INCREASE WEDNESDAY NIGHT AS THE NEXT SYSTEM APPROACHES.
UPPER TROUGH WILL DIG INTO THE WESTERN STATES...AND A COLD FRONT
WILL BEGIN PUSHING INTO THE NORTHERN PLAINS. EXPECT SNOW TO MOVE
INTO THE WESTERN CWA BY CHRISTMAS MORNING.

.LONG TERM...THURSDAY THROUGH TUESDAY
ISSUED AT 240 PM MST TUE DEC 23 2014

LONG WAVE TROF DROPS INTO FOUR CORNERS AREA...THEN
SWINGS ACROSS THE SOUTHERN PLAINS AND CENTRAL US. PRECIPITATION
WILL SPREAD ACROSS THE FORECAST AREA CHRISTMAS DAY AHEAD OF UPPER
LOW OVER THE GREAT BASIN WHILE COLD FRONT WILL CROSS THE AREA EARLY
IN THE DAY...FORECAST SOUNDINGS SHOW TEMPERATURE PROFILE COOL ENOUGH
SO PRECIPITATION WILL BE ALL SNOW. SURFACE LOW WILL TRACK OVER THE
CENTRAL PLAINS...WITH A PRECIPITATION PATTERN SIMILAR TO CURRENT
STORM...UPSLOPE ENHANCED SNOWFALL OVER THE NORTHERN BLACK HILLS AND
ANOTHER BAND OVER SOUTHWESTERN INTO CENTRAL SD. EXPECT LESS SNOWFALL
AS WINDS WILL BE LIGHTER AND FROUDE BARELY REACHES 1.0...AND SNOW
ENDS FRIDAY AS FASTER NORTHERN STREAM SHORT WAVE TROF CROSSES
NORTHERN PLAINS. FORECAST AREA REMAINS UNDER CYCLONIC NORTHWEST FLOW
WITH INDICATIONS OF A DEEP UPPER LOW FORMING OVER CANADA AND ARCTIC
HIGH PUSHING INTO THE PLAINS TOWARD MIDWEEK WILL BRING MUCH COLDER
AIR AND STRONG WINDS TO THE AREA...SO EXPECT A DOWNWARD TREND IN
TEMPERATURES.

&&

.AVIATION...FOR THE 00Z TAFS THROUGH 00Z WEDNESDAY EVENING
ISSUED AT 240 PM MST TUE DEC 23 2014

SNOW SHWRS ENDING ACRS WRN SD THIS AFTN...W/ CIGS AND
VIS IMPROVING. BY SUNSET...MOST OF THE AREA SHD HAVE VFR
CONDITIONS... W/ A FEW MVFR CIGS WL LINGER OVER SCNTRL SD THRU THE
EVEN. NW WNDS WL ALSO DCRS...AND WNDS WL SHIFT TO THE SW OVR NERN WY
TONITE AHD OF SFC TROF.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...NONE.
WY...NONE.
&&

$$

SHORT TERM...POJORLIE
LONG TERM...55
AVIATION...55






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