Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 301932
AFDPIH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
132 PM MDT TUE JUN 30 2015

.DISCUSSION...SHOWERS AND THUNDERSTORMS HAVE REDEVELOPED AGAIN
TODAY MAINLY OVER THE CENTRAL MOUNTAINS AND UPPER SNAKE HIGHLANDS.
EXPECT CONVECTIVE ACTIVITY TO EXPAND INTO THE UPPER SNAKE PLAIN AS
THE AFTERNOON PROGRESSES. STORMS HAVE THE POTENTIAL TO GENERATE GUSTY
WINDS AND LOCALLY HEAVY RAIN WITH AN INVERTED V SOUNDING AND PW
VALUES EXCEEDING ONE INCH TODAY. INCREASING HUMIDITY WILL LIMIT
HIGH TEMPERATURES BELOW THE RECENT RECORD-BREAKING LEVELS IN THE
LOWER TO MID 90S IN MOST AREAS. THE STRONG HIGH PRESSURE RIDGE
OVER THE GREAT BASIN REMAINS IN PLACE...HOWEVER IT TRANSITIONS TO
A NORTHWEST TO SOUTHEAST ORIENTATION FROM NRN CALIF TO NW NEW
MEXICO. THIS SHIFT IN ORIENTATION PLACES SE IDAHO UNDER A DRIER NW
FLOW THROUGH FRIDAY NIGHT. THE UPPER RIDGE BEGINS TO WEAKEN AND
FLATTEN ON FRIDAY AND OPENS THE DOOR FOR ANOTHER ROUND OF
CONVECTIVE SHOWERS FOR THE WEEKEND AND THE UPPER FLOW SHIFTS BACK
TO THE SOUTHWEST. AT PRESENT TIME...EXPECT SHOWERS AND
THUNDERSTORMS ON JULY 4TH TO BE MAINLY FOCUSED ON THE SOUTHERN
HIGHLANDS AND SOUTHERN PORTIONS OF THE SNAKE PLAIN. AN APPROACHING
SYSTEM AND ASSOCIATED SURFACE FRONT SUNDAY WILL INCREASE WINDS FOR
SUNDAY AND ALLOW CONVECTIVE ACTIVITY TO SPREAD NORTHWARD OVER MOST
OF SE IDAHO ON SUNDAY AND CONTINUE INTO MONDAY. DSH

&&

.AVIATION...EXTENSIVE MOISTURE AND INSTABILITY REMAIN IN PLACE OVER
REGION AND COULD SEE ISOLATED THUNDERSTORMS AT ANY TAF SITE THIS
AFTERNOON.   FOR NOW JUST HAVE VICINITY AT ALL SITES THIS AFTERNOON
AND EARLY EVENING.   DRIER NORTHWEST FLOW ALOFT SETS IN WEDNESDAY
AND EXPECT WIDESPREAD DRY CONDITIONS LATER THIS EVENING THROUGH THE
DAY TOMORROW.  EXPECT 10 TO 15 KNOT WINDS TOMORROW AFTERNOON AT
BYI...PIH AND IDA.  GK

&&

.FIRE WEATHER...MAIN THREAT THROUGH FRIDAY WILL BE POTENTIAL
LIGHTNING STRIKES THIS AFTERNOON AND EVENING AS EXTENSIVE
MOISTURE AND INSTABILITY REMAIN IN PLACE.  THINK MOST OF THIS
ISOLATED ACTIVITY WILL BE IN ZONES 475...476...411 AND NORTHERN
410...CENTRAL MOUNTAINS THROUGH NORTHERN SNAKE PLAIN INTO UPPER
SNAKE RIVER HIGHLANDS.  DRIER NORTHWEST FLOW ALOFT MOVES IN
WEDNESDAY AND EXPECT WIDESPREAD DRY CONDITIONS WEDNESDAY THROUGH
FRIDAY WITH TEMPERATURES STILL WELL ABOVE NORMAL.  THE THREAT FOR
SHOWERS AND THUNDERSTORMS WILL LIKELY RETURN SATURDAY AND SUNDAY.

GK

&&

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

&&

$$


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