FXUS63 KOAX 250859
AFDOAX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
259 AM CST THU NOV 25 2010
.DISCUSSION...
THANKSGIVING IS BEING ACCOMPANIED BY QUIETER BUT MUCH COLDER
WEATHER. SUBJECTIVE 00Z UPPER AIR ANALYSIS INDICATES DUAL UPPER
LOWS CENTERED IN ERN MT AND IN NRN CANADA...WITH 160M HEIGHT FALLS
AT 500MB CENTERED IN WRN SD. VERY COLD AIRMASS WAS PUSHING INTO THE
CNTRL US...WITH 850MB TEMPS AS LOW AS -24C IN NERN MT...AND WITH 20C
TEMP GRADIENT BETWEEN KOUN AND KDDC...WITH -10 TO -15C TEMPS PUSHING
INTO ERN NEB/WRN IA BEHIND THE ARCTIC FRONT. SURFACE RIDGING WAS
BUILDING INTO WRN NEB AT 08Z...WITH SLACKENING PRESSURE GRADIENT AS
SFC FRONT PULLS AWAY TO THE EAST. SKIES ARE ON A CLEARING
TREND...THOUGH A BAND OF MID-LEVEL CLOUDS IS WORKING ACROSS ERN NEB.
WITH QUIET WEATHER THROUGH THE WEEKEND...FORECAST CONCERN IS MAINLY
TEMPERATURES. CONTINUED TO HOLD MAX TEMPS TODAY COOLER THAN
GUIDANCE GIVEN COLD START AND CONTINUED MID-LEVEL COLD AIR
ADVECTION. KEPT TEMPS ON THE COOL SIDE TONIGHT AS WELL...WITH
WEAKER WINDS THAN TONIGHT AND CONTINUED COOL AIRMASS. TEMPERATURE
MODERATION WILL BEGIN ON FRIDAY...WITH STRONGER LOW-LEVEL WARM AIR
ADVECTION DEVELOPING SATURDAY AND SUNDAY UNDER UPPER-LEVEL RIDGING.
HAVE BUMPED TEMPS UP OVER THE WEEKEND AS RETURN FLOW LOOKS FAIRLY
STRONG. OTHERWISE...SKIES WILL REMAIN GENERALLY CLEAR TO PARTLY
CLOUDY AS UPPER LOW CONTINUES TO PULL AWAY TO THE NORTHEAST...AND
AREA WILL REMAIN PRECIP-FREE THROUGH SUNDAY NIGHT.
MADE NO CHANGES FOR MONDAY AND BEYOND.
&&
.AVIATION...
TAF SITES KOFK/KOMA/KLNK
06Z TAFS
VFR CONDITIONS ARE EXPECTED THROUGH TAF VALID PERIOD AS SFC HIGH
PRESSURE BUILDS FM ROCKIES ACROSS SRN PLAINS. AN UPPER LVL SYSTEM
OVR ND WL SPREAD OF BAND OF MID/UPR LVL CLOUDS...GENERALLY AT OR
ABOVE 9K FT AGL...ACROSS ERN NEBRASKA EARLY TODAY. WNW SFC WINDS
SHOULD INCREASE WITH HEATING TODAY BUT WILL BACK OFF AGAIN BY
EVENING.
&&
.OAX WATCHES/WARNINGS/ADVISORIES...
NE...NONE.
IA...NONE.
&&
$$
MAYES/CHERMOK