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000
FXUS65 KPIH 172029
AFDPIH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
229 PM MDT FRI MAY 17 2013

.SHORT TERM...TODAY THROUGH SUNDAY NIGHT.
CURRENT WATER VAPOR IMAGERY SHOWS AN UPPER LEVEL TROUGH OVER
WESTERN WASHINGTON...WESTERN OREGON AND CALIFORNIA WITH A MOIST
SOUTHWEST FLOW OVER OUR AREA. CURRENT RADAR IMAGERY SHOWS A BAND
OF SHOWERS FROM HOLBROOK TO DRIGGS MAINLY IMPACTING I-15 FROM THE
UTAH BORDER TO INKOM. ADDITIONAL SHOWERS ARE IMPACTING MOST OF
I-84 FROM THE UTAH BORDER TO THE I-84/I-86 JUNCTION. LIGHT SHOWERS
ARE ALSO OCCURRING OVER THE CENTRAL MOUNTAINS. EXPECT WIDESPREAD
PRECIPITATION TO CONTINUE OVER OUR HIGHER ELEVATIONS THROUGH THE
EVENING WITH SCATTERED PRECIPITATION OVER LOWER ELEVATIONS.
ISOLATED THUNDERSTORMS WILL BE POSSIBLE ACROSS THE AREA THIS
AFTERNOON INTO EARLY EVENING.

THE UPPER LEVEL TROUGH WILL SHIFT SLIGHTLY EAST TOMORROW. EXPECT
GOOD PRECIPITATION CHANCES AND ISOLATED THUNDERSTORMS ACROSS OUR
CENTRAL AND EASTERN AREAS MAINLY ACROSS HIGHER ELEVATIONS FOR THE
LOST RIVER/PAHSIMEROI...UPPER SNAKE HIGHLANDS AND EASTERN
HIGHLANDS. EXPECT BREEZY TO MODERATE WINDS ON SATURDAY
PARTICULARLY FOR THE SNAKE RIVER PLAIN. A LAKE WIND ADVISORY MAY
BE NEEDED FOR THE AMERICAN FALLS RESERVOIR. CURRENTLY MODELS SHOW
WIND SPEEDS ON THE LOWER END OF THE ADVISORY THRESHOLD. ON SUNDAY
MODELS SHOW A WEAK UPPER LEVEL LOW DEVELOPING OVER THE CENTRAL
MOUNTAINS. EXPECT PRECIPITATION MAINLY OVER THE CENTRAL
MOUNTAINS...UPPER SNAKE HIGHLANDS AND EASTERN HIGHLANDS ON SUNDAY.

SNOW LEVELS WILL DROP TO AROUND 7000FT DURING THE EVENINGS AND
BE AROUND 8000 FT DURING THE DAY THROUGH THE PERIOD. EXPECT AROUND 3
TO 6 INCHES OF SNOW ABOVE 7000 FT THROUGH THE PERIOD. LOOK FOR
SLIGHTLY BELOW AVERAGE TEMPERATURES THROUGH THE PERIOD.

WITH GOOD PRECIPITATION CHANCES AND CURRENT SNOW MELT LOOK FOR
INCREASED FLOWS FOR STREAMS AND RIVERS ACROSS OUR AREA. SWIFT
FLOWS WILL POSE A THREAT TO THOSE VENTURING NEAR WATER EDGES OR
FALLING IN. PLEASE SEE OUR HYDROLOGIC STATEMENT FOR MORE DETAILED
INFORMATION. WYATT

.LONG TERM... MONDAY THROUGH FRIDAY...EXITING SYSTEM DURING THE DAY
MONDAY ENABLES UPPER RIDGING TO WORK INTO THE AREA FOR A FEW DAYS OF
WARMING. MOUNTAIN SHOWERS WILL BE THE ONLY SPOILER TO A MOSTLY DRY
COUPLE OF DAYS BEFORE SIGNIFICANT TROUGH WORKS INTO THE AREA
WEDNESDAY. TEMPERATURES RAMPING UP TO NEAR OR SIGHTLY ABOVE AVERAGE
TUESDAY AND WEDNESDAY BEFORE A COLD FRONT PUNCHES THROUGH EAST IDAHO
WEDNESDAY AFTERNOON.

LARGE UPPER LOW WORKS INTO WASHINGTON STATE WEDNESDAY WITH A SHARP
PRESSURE GRADIENT BRINGING GUSTY WINDS TO EAST IDAHO WEDNESDAY
AFTERNOON. COLD FRONT LOOKS TO PASS THROUGH THE CWA DURING THE
AFTERNOON AND IF THE TIMING PANS OUT IT COULD BE ACCOMPANIED BY
THUNDERSTORMS. THIS THEN SETS THE STAGE FOR A COOLER AND BLUSTERY
END OF THE WEEK WITH PERIODS OF SHOWERS. DITTMANN


&&

.AVIATION...RAIN IS DEVELOPING OVER THE SOUTHERN HIGHLANDS EARLY
THIS AFTERNOON AND SHOULD SPREAD NORTH TO IMPACT TAF SITES BY
MID TO LATE AFTERNOON. ISOLD TSTMS WILL BE POSSIBLE THRU THIS EVE AS
WELL. VFR CONDITIONS WILL PREVAIL...BUT CIGS MAY OCCASIONALLY DROP
TO IFR AS HEAVIER AREAS OF RAIN MOVE THROUGH. DITTMANN


&&

.FIRE WEATHER...SHOWERS AND A FEW AFTERNOON AND EVENING
THUNDERSTORMS WILL SPREAD ACROSS CENTRAL AND SOUTHEAST IDAHO TODAY
AS AN UPPER TROUGH MOVES THROUGH THE PAC NW. TEMPERATURES WILL BE
SEVERAL DEGREES COOLER TODAY. SHOWERY CONDITIONS AND COOL TEMPS WILL
CONTINUE THROUGH THE WEEKEND. DRY CONDITIONS AND WARMER TEMPS ARE
EXPECTED ON MON AND TUE AS UPPER RIDGING MOVES INTO THE NW. A DEEP
UPPER LOW IS EXPECTED TO MOVE INTO THE PAC NW BY WED...BRINGING RAIN
AND COOLER TEMPS TO THE REGION THROUGH THE END OF NEXT WEEK.
HEDGES

&&


.PIH WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$