000
FXUS63 KUNR 101002
AFDUNR

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
302 AM MST WED FEB 10 2010

.DISCUSSION...09Z SURFACE ANALYSIS HAS ARCTIC HIGH PRESSURE OVER
SOUTH CENTRAL CANADA INTO THE EASTERN DAKOTAS. ARCTIC BOUNDARY
STRETCHES ACROSS CENTRAL MT...CENTRAL WY...AND INTO CO. UPPER
LEVEL ANALYSIS HAS CUT OFF LOW OVER THE MIDWEST...WITH ANOTHER
ALONG THE SOUTHERN CALIFORNIA COAST. SKIES ARE MAINLY CLEAR
ACROSS THE AREA. TEMPS RANGE FROM THE TEENS...TO 10 BELOW ZERO.
WINDS ARE GENERALLY LIGHT.

MILDER WEATHER CAN BE EXPECTED FOR THE LAST HALF OF THE WEEK AS 
ARCTIC AIR IS GRADUALLY SCOURED OUT OF THE AREA FROM SOUTHWEST TO 
NORTHEAST. TEMPS WILL GET BACK CLOSER TO AVERAGE LEVELS BY 
THURSDAY...BUT WITH SNOWCOVER IN PLACE ACROSS MOST OF THE AREA... 
THEY SHOULD GENERALLY REMAIN BELOW AVERAGE. 

FOR TODAY...ARCTIC BOUNDARY WILL SHIFT SLIGHTLY EAST...LIKELY
STALLING OUT OVER THE HILLS AREA. HIGHS TODAY SHOULD GENERALLY
BE IN THE LOW TO MID 30S ACROSS NORTHEASTERN WY AND FAR
SOUTHWESTERN SD...UPPER TEENS AND 20S TO THE NORTH AND EAST OF THE
HILLS.

THURSDAY WILL BE EVEN MILDER...WITH MOST LOCATIONS EXPECTED TO GET 
INTO THE 30S. FAR NORTHERN AND EASTERN AREAS WILL LIKELY STAY IN 
THE 20S. WEAK UPPER LEVEL ENERGY IN NORTHWEST FLOW IS PROGGED TO 
CROSS THE AREA...BRINGING CLOUDINESS AND POSSIBLY A FEW SNOW SHOWERS 
NEAR THE FRONTAL BOUNDARY THURSDAY INTO THURSDAY NIGHT.

FRIDAY WILL REMAIN MILD WITH HIGHS GENERALLY IN THE MID 20S TO
UPPER 30S. ANOTHER IMPULSE WILL SLIDE OUT OF MONTANA AND BRING A
SLIGHT CHANCE OF SNOW TO NORTHEAST WYOMING AND NORTHWEST SOUTH
DAKOTA.  

EXTENDED...MODELS CONTINUE TO SHOW A VIGOROUS UPPER LOW DROPPING OUT 
OF CANADA AND THRU THE NRN PLAINS LATE FRIDAY AND SATURDAY. THIS 
WILL BRING ANOTHER SHOT OF ARCTIC AIR BACK INTO THE FORECAST AREA 
ALONG WITH A CHANCE FOR LIGHT SNOW. HAVE CONTINUED TO TREND 
TEMPERATURES DOWNWARD...BUT THIS MAY STILL NOT BE COLD ENOUGH. COOL 
BUT DRIER CONDITIONS WILL PREVAIL FOR THE END OF THE WEEKEND AND 
EARLY NEXT WEEK...WITH A SLOW MODERATING TREND INTO THE MIDDLE OF 
NEXT WEEK AS AN UPPER RIDGE BUILDS THRU THE NRN ROCKIES.

&&

.AVIATION...VFR CONDITIONS EXPECTED TODAY AND TONIGHT.

&&

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

$$