Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 200936
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
336 AM MDT WED AUG 20 2014

.SHORT TERM...TODAY THROUGH THURSDAY...A PATTERN CHANGE WILL
GRADUALLY COOL AND DRY CONDITIONS ACROSS THE PAC NW THROUGH
THURSDAY. FOR TODAY A WEAK IMPULSE WILL COMBINE WITH MOISTURE AND
INSTABILITY TO SUPPORT SHOWERS AND THUNDERSTORMS ACROSS SW IDAHO
ZONES. ENOUGH DRY AIR MAKES INROADS INTO SE OREGON TO LIMIT
SHOWERS AND STORMS TO THE ID/OR BORDER AREA. CONVECTIVE
PARAMETERS ARE MINIMAL SO BIGGEST THREAT AGAIN TODAY WOULD BE
GUSTY OUTFLOW WINDS TO 40 MPH. DRIER AIRMASS ADVANCES INTO SW
IDAHO ON THURSDAY LEAVING A CHANCE OF AFTERNOON SHOWERS AND
THUNDERSTORMS FROM CENTRAL IDAHO...EASTWARD. TEMPERATURES TODAY
ARE 5-8F DEGREES COOLER THAN YESTERDAY WITH ANOTHER FEW DEGREES OF
COOLING INTO THURSDAY.

.LONG TERM...THURSDAY NIGHT THROUGH TUESDAY...NO SIGNIFICANT
CHANGES TO THE FORECAST AS UPPER LEVEL TROUGH REMAINS OVER THE
REGION. A CLOSED LOW FORMS LATE THURSDAY OVER WASHINGTON AND
SHIFTS SOUTHEAST INTO OUR NORTHERN ZONES ON FRIDAY. INCREASED
SOUTHWESTERLY FLOW AND SUFFICIENT MOISTURE ACROSS IDAHO
SUGGESTIONS AT LEAST A CHANCE OF PRECIPITATION ACROSS THE HIGHER
TERRAIN OF SOUTHWEST IDAHO. THE LOW PRESSURE SYSTEM MOVES OUT OF
THE REGION ON SATURDAY BUT IS FOLLOWED BUT TWO MORE UPPER TROUGHS
EMBEDDED IN THE NORTHWESTERLY FLOW FROM SUNDAY AND MONDAY. THESE
TROUGHS WILL BE DRY AND BRING IN RE-ENFORCING SHOTS OF COLD AIR.
TEMPERATURES WILL REMAIN BELOW NORMAL THROUGH THE PERIOD...THE
COLDEST DAYS BEING SATURDAY AND SUNDAY WHICH WILL BE ABOUT 10
DEGREES BELOW NORMAL. THE TROUGH IS EXPECTED TO SHIFT EAST TUESDAY
LEAVING OUR AREA UNDER DRY NORTHWEST FLOW ALOFT AND THE BEGINNING
OF A GRADUAL WARMING TREND.

&&

.AVIATION...VFR. SCATTERED SHOWERS AND THUNDERSTORMS WILL REDEVELOP
OVER MUCH OF SOUTHWEST IDAHO AFTER 18Z. SURFACE WINDS NORTHWEST 5-10
KTS INCREASING TO 10 TO 15 KTS WITH GUSTS TO 20 KTS AFTER
18Z...WINDS GUSTS TO 35 KTS VICINITY THUNDERSTORMS AFTER 21Z. WINDS
ALOFT NORTHWEST 10 TO 15 KTS THROUGH 10K FT MSL.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...NONE.
OR...NONE.

&&

$$

WEATHER.GOV/BOISE

SHORT TERM...DG
LONG TERM....JS
AVIATION.....JS



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