Cold in Idaho, December 6 to 7, 2005

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
300 PM MST TUE DEC 6 2005

.SHORT TERM...VERY COLD FOR THE NEXT 48 HOURS. MADE SOME
CALCULATIONS WITH FORECASTED TEMPERATURES (ZERO TO -20) AND ASSUMED
AN AVERAGE WIND SPEED OF 10 MPH AND GOT -15 TO -30 WIND CHILLS.
STRONGEST WINDS WILL LIKELY BE IN THE UPPER SNAKE VALLEY BUT WITH A
25KT 7H JET FROM THE NORTH...MANY LOCAL N-S CANYONS COULD FUNNEL
WINDS AND GIVE SOME VERY LOW WIND CHILLS. WILL ISSUE A WIND CHILL
WARNING FOR MOST OF OUR NE ZONES. OTHERWISE 3H JET RACING SE ACROSS
WESTERN ZONES AND IT APPEARS ONE LAST S/WV DROPPING SOUTH ACROSS
AREA THIS EVENING SO LEFT SLIGHT CHC POPS IN ZNS 17/22 FOR LOCAL
UPSLOPE. EXPECT CLEARING AFTER MIDNIGHT. DRY AND COLD FOR WED WITH
TEMPS STRUGGLING TO GET INTO THE LOWER TEENS IN THE VALLEYS.
NORTHERLY FLOW ALOFT WILL CONTINUE ACROSS AREA INTO THURSDAY. A
SYSTEM APPROACHES AREA BUT IS FORCED TO SLIDE SOUTH INTO CA LATE
THU. THIS WILL FORCE A S/WV RIDGE TO FORM OVER AREA FOR CONTINUED
COLD AND DRY WX.

WINTHER

.LONG TERM...FRIDAY THROUGH TUESDAY. ALL MODEL SOLUTIONS SHOWING SE
IDAHO UNDER UPPER LEVEL RIDGE AND ASSOCIATED SURFACE HIGH SO WILL
REMAIN DRY AND COLD WITH TEMPERATURES REMAINING BELOW CLIMATE NORMS
THROUGH SUNDAY.  RIDGE AXIS MAY RETROGRADE SLIGHTLY LATE IN THE
PERIOD AND PLACE NORTHEAST PORTION OF FORECAST AREA UNDER NORTHWEST
FLOW WHICH WOULD CONTINUE TO CAP TEMPERATURES.  OTHERWISE...A WARMUP
FOR EARLY NEXT WEEK AS A SYSTEM BEGINS TO APPROACH THE PAC NW COAST
ON MONDAY AND GENERATE A SOUTHERLY PUSH AND WARMING FOR MONDAY NIGHT
AND TUESDAY. DSH

&&

.AVIATION...MOSTLY VFR TO MVFR CONDITIONS...HOWEVER A PERSISTENT
BAND OF SNOW AND SNOW SHOWERS FROM NEAR BOI TO PIH WITH MVFR TO IFR
VIS AND CIGS.  SNOW WILL GRADUALLY DIMINISH THIS EVENING WITH
WIDESPREAD VFR OVER NIGHT.  POSSIBLE EXCEPTION IS IFR CONDITIONS IN
WESTERN WY DUE TO FOG AND STRATUS ON TWEB ROUTE 343 AND LINGERING
SNOW SHOWERS ALONG TWEB ROUTE 344.  DSH

&&

.PIH WATCHES/WARNINGS/ADVISORIES...WIND CHILL WARNING FOR ZONES
18/19/20/21/23/31/32. SEE BOIWSWPIH STATEMENT FOR FURTHER DETAILS.
&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE POCATELLO ID
400 AM MST TUE DEC 6 2005

IDZ017>025-031-032-071215-
EASTERN MAGIC VALLEY-SAWTOOTH MOUNTAINS-UPPER SNAKE HIGHLANDS-
UPPER SNAKE RIVER PLAIN-LOWER SNAKE RIVER PLAIN-
SOUTH CENTRAL HIGHLANDS-CARIBOU HIGHLANDS-
CACHE VALLEY/IDAHO PORTION-WASATCH MOUNTAINS/IDAHO PORTION-
BIG AND LITTLE WOOD RIVER REGION-LOST RIVER/PAHSIMEROI-
400 AM MST TUE DEC 6 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN IDAHO.

.DAY ONE...
TODAY AND TONIGHT...AN ARCTIC AIRMASS WILL SLIDE SOUTHEAST ALONG THE
CONTINENTAL DIVIDE TODAY INTO TONIGHT BRINGING FRIGID TEMPERATURES
FOR WEDNESDAY MORNING. MINIMUM TEMPERATURES WEDNESDAY MORNING IN THE
UPPER SNAKE HIGHLANDS ARE EXPECTED TO BE 10 TO 14 DEGREES BELOW
ZERO. NORTHEAST WINDS MAY BE UP TO 5 MPH PRODUCING WIND CHILL
TEMPERATURES TO NEAR 20 BELOW ZERO.

.DAYS TWO THROUGH SEVEN...
THURSDAY THROUGH MONDAY...FRIGID TEMPERATURES WILL CONTINUE THURSDAY
AND FRIDAY WITH SUBZERO LOWS AND HIGHS ONLY IN THE SINGLE DIGITS TO
MID TEENS.  TEMPERATURES WILL MODERATE OVER THE WEEKEND.

.SPOTTER INFORMATION STATEMENT...

WE ASK ALL TRAINED SPOTTERS TO REPORT SIGNIFICANT WEATHER
CONDITIONS. THIS WOULD INCLUDE ALL HAIL...WIND...HEAVY RAIN AND
FLOODING REPORTS. THIS INFORMATION SHOULD BE CALLED INTO THE
LOCAL NATIONAL WEATHER SERVICE OFFICE IN POCATELLO USING THE
1-800 SEVERE WEATHER HOTLINE...OR OTHER STANDARD OPERATING
PROCEDURES.