National Weather Service National Headquarters

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

000
FXUS65 KPIH 240058
AFDPIH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
658 PM MDT THU MAY 23 2013

.UPDATE...UPDATED GRIDS FOR LIGHT PRECIPITATION AND GUSTY WINDS
FOR THIS EVENING AS A WEAK TROUGH MOVES THROUGH EASTERN MAGIC
VALLEY AND THE SNAKE RIVER PLAIN. THE LEADING EDGE OF THE TROUGH
HAS JUST PASSED THROUGH POCATELLO AND IS CREATING GUSTY WINDS OF 25
TO 35 MPH THROUGH THE EASTERN MAGIC VALLEY AND THE SNAKE RIVER
PLAIN. VISIBILITIES ARE SLIGHTLY REDUCED WITH ISOLATED POCKETS OF
BLOWING DUST. WYATT

&&

.PREV DISCUSSION... /ISSUED 124 PM MDT THU MAY 23 2013/

SHORT TERM...TONIGHT THROUGH SUNDAY. THE DEEP UPPER LOW CONTINUES
TO SPIN OVER WA THIS AFTN. A SECONDARY CIRCULATION CENTER NEAR THE
NRN CA/NV BORDER IS EXPECTED TO ROTATE INTO ID BY THIS EVE. THIS
WAVE WILL SET OFF SCT SHOWERS AND ISOLD TSTMS OVER THE NORTHERN
PART OF THE FCST AREA THIS AFTN AND EVE BEFORE ROTATING INTO MT
LATER TONIGHT. THE UPPER LOW IS EXPECTED TO LIFT OUT OF WA INTO
BC/AB ON FRIDAY. THIS WILL TAKE MOST OF THE PRECIP NORTH OUT OF
THE AREA...WITH ONLY ISOLD SHOWERS IN THE FAR NORTH THRU FRI
NIGHT. PRECIP COVERAGE WILL INCREASE SOMEWHAT OVER THE CENTRAL
MTNS SAT AFTN/EVE AS ANOTHER MINOR UPPER WAVE MOVES THRU. A MORE
VIGOROUS UPPER TROF MOVES INTO THE PAC NW ON SUNDAY. THIS WILL
INCREASE THE THREAT OF SHOWERS AND ISOLD TSTMS ACROSS THE FCST
AREA SUN AFTN...WITH THE BEST CHANCES IN THE NORTH.

THE COLD UPPER LOW TODAY...ALONG WITH CLEAR SKIES AND LIGHT WINDS
WILL ALLOW TEMPS TO FALL TO UNSEASONABLY COLD READINGS FRI
MORNING. TEMPS WILL BE VERY NEAR 32 F IN OUTLYING AREAS...SO A
FROST ADVISORY WILL BE ISSUED FOR THE SNAKE RIVER PLAIN/EASTERN
MAGIC VALLEY. TEMPS WILL WARM UP FOR FRI AFTN AND THRU THE WEEKEND.
HEDGES

LONG TERM...SUNDAY NIGHT THROUGH THURSDAY.
OVERALL MODELS DIFFER IN THIS PERIOD IN STRENGTH AND TIMING OF TROFS
MOVING THROUGH EASTERN IDAHO BUT BOTH EUROPEAN AND GFS MODELS
INDICATE CONVECTIVE ACTIVITY MONDAY THROUGH WEDNESDAY AT LEAST.
KEPT IN SLIGHT CHANCE OR CHANCE OF SHOWERS AND THUNDERSTORMS IN EACH
PERIOD.  WILL BE MANY DRY PERIODS BUT WITH THE MODEL AND TIMING
DIFFERENCES TOUGH TO DISTINGUISH.  GFS KEEPS UPPER LOW OFF COAST
WHILE EUROPEAN MORE PROGRESSIVE AND ZONAL IN FLOW ALOFT.
TEMPERATURES SHOULD BE NEAR SEASONAL NORMALS WITHIN A FEW DEGREES.
GK

AVIATION...HAS BEEN VFR TODAY WITH MAINLY A MID LEVEL CLOUD DECK.
EXPECT ISOLATED SHOWERS AND THUNDERSTORMS NEAR SUN AND HAVE THAT AS
VICINITY IN TAF.  AT 1 PM UP VALLEY WINDS HAVE NOT YET DEVELOPED AT
PIH AND IDA BUT EXPECT SOME MAINLY 10 TO 15 KNOTS AT MOST LATER THIS
AFTERNOON.   CONTINUED VFR THROUGH FRIDAY.
GK

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
FROST ADVISORY FROM 3 AM TO 8 AM MDT FRIDAY IDZ017-020-021.

&&

$$