174
FXUS63 KUNR 071038
AFDUNR
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
340 AM MST SAT NOV 7 2009
DISCUSSION
10Z SFC ANALYSIS SHOWS A WEAK TROUGH EXTENDING FROM
LATE SUPERIOR INTO SOUTHWESTERN KANSAS WITH WEAK HIGH PRESSURE OVER
THE NORTHERN PLAINS. UPPER AIR ANALYSIS SHOWS A FEW WEAK SHORTWAVE
EMBEDDED IN ZONAL FLOW OVER THE AREA.
HIGH TEMPERATURES TODAY WILL RANGE FROM 10 TO 15 DEGREES COOLER THAN
YESTERDAY DUE TO HIGH PRESSURE THAT MOVED IN BEHIND A WEAK COLD
FRONT OVERNIGHT. LIGHT WINDS WILL BE FOUND ACROSS MUCH OF THE AREA
THIS MORNING DUE TO THE HIGH PRESSURE. AS THE HIGH MOVES EAST
TODAY...SOUTHEASTERLY WINDS WILL INCREASE ACROSS NORTHEASTERN
WYOMING AND WESTERN SOUTH DAKOTA. A SHORTWAVE WILL CROSS THE
NORTHERN PLAINS TONIGHT WHICH WILL INTERACT WITH A WEAK SURFACE
BOUNDARY OVER FAR NORTHEASTERN WYOMING AND FAR NORTHWESTERN SOUTH
DAKOTA. THERE MAY BE ENOUGH FORCING FOR SOME LIGHT PRECIPITATION TO
DEVELOP OVER THOSE AREAS SO HAVE INCLUDED A SLIGHT CHANCE OF
PRECIPITATION TONIGHT.
TEMPERATURES WILL REMAIN SLIGHTLY WARMER THAN NORMAL ON SUNDAY AND
MONDAY. A COUPLE MORE SHORTWAVES WILL CROSS THE AREA...BUT
MODELS CONTINUE TO INDICATE JUST AN INCREASE IN MID AND HIGH CLOUD
COVER WITH DRY AIR IN THE LOWER LEVELS.
EXTENDED...MAINLY DRY AND MILD WEATHER IS EXPECTED INTO THE MIDDLE
PART OF NEXT WEEK AS AN UPPER LEVEL RIDGE PASSES OVER THE AREA.
TEMPS WILL GENERALLY BE ABOVE SEASONAL AVERAGES. NEXT CHANCE FOR
PRECIPITATION LOOKS TO BE WEDNESDAY NIGHT INTO THURSDAY AS NEXT
SHORTWAVE APPROACHES. TEMPERATURES WILL COOL TO NEAR AVERAGE LATE IN
THE WEEK.
AVIATION
VFR CONDITIONS CAN BE EXPECTED THROUGH THE FORECAST
PERIOD.
UNR WATCHES/WARNINGS/ADVISORIES
SD...NONE.
WY...NONE.
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