FXUS65 KPIH 221106
AFDPIH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
406 AM MST TUE DEC 22 2009

.SHORT TERM...TODAY THROUGH WEDNESDAY NIGHT...A PACIFIC LOW IS
CURRENTLY OVER CENTRAL WASHINGTON AND OREGON WITH AN ASSOCIATED
COLD FRONT LOCATED JUST OVER OREGON INTO WESTERN IDAHO. LOOKING AT
WEB CAMS...MODERATE SNOW SHOWERS HAVE JUST STARTED IN THE CENTRAL
MOUNTAINS. EXPECT THIS LOW TO TRACK OVER MAGIC VALLEY ESE ACROSS
THE SOUTHERN HIGHLANDS AND WASATCH MOUNTAINS. THUS...OUR WESTERN
AND SOUTHERN BORDERS WILL RECEIVE THE MOST SNOW FROM THIS SYSTEM.
ADDITIONALLY...THE MAGIC VALLEY AND THE SOUTH CENTRAL HIGHLANDS
WILL SEE WIND GUSTS OF 20 TO 25 MPH WITH LOCALLY HIGHER GUSTS
ADDING THE HAZARD OF BLOWING SNOW. SEVERAL WINTER WARNINGS AND
ADVISORIES HAVE BEEN ISSUED TO HIGHLIGHT AREAS OF CONCERN. PLEASE
SEE BELOW FOR A COMPLETE LIST OF THESE ADVISORIES AND WARNINGS.
WEDNESDAY A SECONDARY LOW WILL DROP DOWN FROM MONTANA OUT OF
CANADA IMPACTING OUR EASTERN BORDER FOR THE POTENTIAL FOR
ADDITIONAL SNOW. UPPER LEVEL RIDGING WILL BUILD INTO THE AREA. VERY
COLD AND DRY NORTHERLY FLOW WILL DROP IN FROM CANADA LATER
WEDNESDAY. THIS WILL BRING SOUTHEAST IDAHO MUCH COOLER THAN NORMAL
TEMPERATURES THROUGH THE REMAINDER OF THE WEEK AND WEEKEND. WYATT

.LONG TERM...THURSDAY THROUGH TUESDAY...LITTLE CHANGES MADE TO
PRECIPITATION CHANCES IN THE EXTENDED. RIDGE OF HIGH PRESSURE IS
STILL EXPECTED TO PRODUCE DRY WEATHER THROUGH THE FIRST HALF OF
THE WEEKEND. MODELS ARE HAVING A TOUGH TIME BREAKING DOWN THE
RIDGE AFTERWARDS. ANY SYSTEMS THAT COME THROUGH ARE EXPECTED TO BE
FAIRLY WEAK SO CONTINUE LOW CHANCES FOR LATE WEEKEND INTO EARLY
NEXT WEEK. BIG STORY WILL BE THE COLD OUTBREAK. MODELS HAVE TURNED
SHARPLY COLDER AND NOW THIS OUTBREAK IS COMPARABLE TO THE LAST ONE
THAT THE ARE EXPERIENCED.

&&

.AVIATION...AT 3 AM SUN VALLEY IS REPORTING SNOW ALONG WITH IFR 
CEILINGS...LOW CLOUDS AND SNOW SHOWERS WILL SPREAD ACROSS THE AREA 
FROM SOUTHWEST TO NORTHEAST EARLY THIS MORNING AND SPREAD INTO IDA 
AND PIH AROUND 15Z...SNOW SHOWERS WILL PERSIST INTO THE AFTERNOON 
BEFORE TAPERING OFF AND ENDING FROM WEST TO EAST DURING THE THE 
EVENING...MARGINAL VFR CONDITIONS MAY PERSIST MUCH OF TUESDAY NIGHT 
AS LOWER CLOUDS ARE EXPECTED ALTHOUGH CEILINGS MAY LIFT IN SUN 
VALLEY.

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
WINTER WEATHER ADVISORY UNTIL 5 AM MST WEDNESDAY FOR IDZ017-021-
023>025.

WINTER WEATHER ADVISORY UNTIL 5 PM MST THIS AFTERNOON FOR IDZ032.

WINTER STORM WARNING UNTIL 5 AM MST WEDNESDAY FOR IDZ022.

WINTER STORM WARNING UNTIL 5 PM MST THIS AFTERNOON FOR IDZ018-
031.

&&

$$