Area Forecast Discussion
Issued by NWS Boise, ID

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000
FXUS65 KBOI 301451
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
851 AM MDT SAT MAY 30 2015

.DISCUSSION...
WEAK UPPER LOW OVER BRITISH COLUMBIA THIS MORNING IS HELPING TO
DRAG A WEAK COOL FRONT INTO WASHINGTON/ORE. THIS COMBINED WITH A
WARM FRONT ASSOCIATED WITH ANOTHER LOW APPROACHING THE WEST COAST
SHOULD HELP KEEP EXTENSIVE CLOUD COVER ACROSS THE REGION. WEAK
UPPER S/W AND JET MAX RIDING ALONG THE BOUNDARY/ ALG THE COLUMBIA
RIVER/ IS BRINGING A FEW SHOWERS TO BAKER COUNTY ALONG WITH AREAS
GENERALLY NORTH OF MCCALL. MADE A FEW CHANGES TO THE MORNING
FORECAST BASED ON CURRENT CONDITIONS AND LOWERED MAX TEMPS A FEW
DEGREES BUT WOULDN`T BE SURPRISED IF WE STAYED SLIGHTLY
COOLER...BUT WE ARE STARTING OUT MUCH WARMER THAN YESTERDAY
MORNING. THIS AFTERNOONS FORECAST STILL LOOKS GOOD.

&&

.AVIATION...
VFR. ISOLATED TO SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS
THROUGH THIS EVENING MAINLY NORTH OF A KBNO-KMYL-KSNT LINE.
THUNDERSTORMS ENDING AND SHOWERS BECOMING ISOLATED BY 06Z.
OTHERWISE AREAS OF MID LEVEL AND HIGH CEILINGS. SURFACE WINDS...
VARIABLE 10 KTS OR LESS. WINDS ALOFT...SOUTHWEST 10-15 KTS UP
THROUGH 10K FT MSL

&&

.PREV DISCUSSION...
SHORT TERM...TODAY THROUGH SUNDAY...AN AREA OF LIGHT SHOWERS WAS
MOVING NE THROUGH THE NORTHERN HALF OF THE CWA AS OF 3 AM MDT.
MOST OF THESE SHOWERS ARE REMAINING ALOFT...MEANING THEY ARE
VIRGA...HOWEVER A FEW ARE LIKELY REACHING THE GROUND. THESE ARE
ASSOCIATED WITH A WEAK SHORTWAVE MOVING THROUGH A WEAK RIDGE.
THIS AREA IS FORECAST TO MOVE RAPIDLY NORTHEAST AND LEAVE THE AREA
BY 6 AM MDT. OTHERWISE...HEIGHTS ALOFT WILL CONTINUE TO RISE
THROUGH SUNDAY AS AN UPPER LEVEL LOW PULLS EAST FROM BRITISH
COLUMBIA WHILE ANOTHER LARGER LOW BECOMES ESTABLISHED OFF THE PAC
NW COAST. WE WILL SEE WARMER TEMPS EACH DAY THIS WEEKEND WITH
ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS...MAINLY IN THE
HIGHER ELEVATIONS AND MAINLY IN THE NORTH. TEMPS WILL BE AROUND 15
DEGREES ABOVE NORMAL SUNDAY...WITH UPPER 80S IN THE WESTERN MAGIC
VALLEY AND LOWER 90S IN THE TREASURE VALLEY. WINDS WILL BE LIGHT
APART FROM SHOWERS AND STORMS.

LONG TERM...SUNDAY NIGHT THROUGH FRIDAY...AN UPPER LEVEL TROUGH
WILL BEGIN TO SHIFT INLAND ON MONDAY FOR SHOWERS AND THUNDERSTORMS.
EXPECT SHOWERS EARLY MONDAY MORNING ACROSS MAINLY SOUTHWEST IDAHO
AHEAD OF A WEAK EMBEDDED SHORTWAVE. THE SHORTWAVE EXITS FOLLOWED BY
DRY AIR ALOFT. THUNDERSTORMS FAVOR HIGHER TERRAIN AND WILL BE LIMITED
BY CLOUD COVER AND MARGINAL DYNAMIC SUPPORT. A COLD FRONT PASSAGE
EARLY MONDAY AFTERNOON...WILL BRING TEMPERATURES AROUND 8 DEGREES
COOLER THAN SUNDAY. ON TUESDAY...EXPECT TEMPERATURES AROUND 10
DEGREES COOLER THAN MONDAY AS THE UPPER LEVEL TROUGH REMAIN OVER
THE PACIFIC NORTHWEST. THE TROUGH SHIFTS INTO THE INTERMOUNTAIN
REGION BY THURSDAY AND LINGERS OVER THE REGION THROUGH
SATURDAY...WITH TEMPERATURES AVERAGING A FEW DEGREES BELOW
NORMAL...AND A CHANCE OF SHOWERS AND THUNDERSTORMS EACH DAY.

&&

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

&&

$$

WEATHER.GOV/BOISE

DISCUSSION...CR
AVIATION.....JT
PREV SHORT TERM...SP
PREV LONG TERM....JS


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