Red Flag Warning 27, NWS Boise, ID

086 
WWUS85 KBOI 241443
RFWBOI

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE BOISE ID
843 AM MDT FRI AUG 24 2012

...RED FLAG WARNING IN EFFECT FROM NOON TO 7 PM MDT FOR GUSTY
WINDS AND LOW RELATIVE HUMIDITIES FOR TREASURE VALLEY AND WESTERN
TWIN FALLS BLM...WHICH ARE FIRE WEATHER ZONES 408 AND 418...

.A DRY COLD FRONT HAS PUSHED INTO CENTRAL IDAHO EARLY THIS
MORNING. STRONG AND GUSTY POST FRONTAL WEST TO NORTHWEST CAN BE
EXPECTED ACROSS THE WARNING AREA THROUGH THE EARLY EVENING HOURS.

IDZ408-418-250100-
/O.CON.KBOI.FW.W.0027.120824T1800Z-120825T0100Z/
TREASURE VALLEY-WESTERN TWIN FALLS BLM-
843 AM MDT FRI AUG 24 2012

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 7 PM MDT
THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITIES FOR
TREASURE VALLEY AND WESTERN TWIN FALLS BLM...WHICH ARE FIRE
WEATHER ZONES 408 AND 418...

A RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 7 PM MDT
THIS EVENING. 

* WINDS...NORTHWEST 15 TO 25 MPH WITH GUSTS UP TO 35 MPH.

* RELATIVE HUMIDITY...AS LOW AS 8 PERCENT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF
STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL
CREATE EXPLOSIVE FIRE GROWTH POTENTIAL.

&&

$$


W

612 
WWUS85 KBOI 250054
RFWBOI

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE BOISE ID
654 PM MDT FRI AUG 24 2012

...RED FLAG WARNING EXPIRING AT 7PM FOR THE TREASURE VALLEY AND
WESTERN TWIN FALLS BLM WHICH ARE FIRE ZONES 408 AND 418...

.WINDS ARE EXPECTED TO DROP OFF QUICKLY AFTER SUNSET AND RELATIVE
HUMIDITY VALUES WILL RISE AS NIGHTFALL APPROACHES. 

IDZ408-418-250200-
/O.EXP.KBOI.FW.W.0027.000000T0000Z-120825T0100Z/
TREASURE VALLEY-WESTERN TWIN FALLS BLM-
654 PM MDT FRI AUG 24 2012

...RED FLAG WARNING WILL EXPIRE AT 7 PM MDT THIS EVENING FOR
GUSTY WINDS AND LOW RELATIVE HUMIDITIES FOR TREASURE VALLEY AND
WESTERN TWIN FALLS BLM...WHICH ARE FIRE WEATHER ZONES 408 AND
418...

THE RED FLAG WARNING WILL EXPIRE AT 7 PM MDT THIS EVENING. 


$$

W

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1000 AM MDT THU AUG 23 2012

.DISCUSSION...VISIBILITY IN THE LOWER VALLEYS OF SOUTHWEST IDAHO
IS DOWN BELOW 5 STATUTE MILES AGAIN THIS MORNING AFTER SMOKE FROM
NUMEROUS CENTRAL IDAHO FIRES FILTERED IN WITH THE OVERNIGHT SURFACE
DRAINAGE FLOW. MORE ON SMOKE/VISIBILITY IN THE AIR STAGNATION SECTION
BELOW. CLEAR SKIES TODAY WITH AN UPPER LEVEL LOW PRESSURE SYSTEM MAKING
ITS WAY INTO THE PACIFIC NORTHWEST FROM WESTERN CANADA. WINDS WILL
INCREASE THIS AFTERNOON FROM THE WEST AS THE SURFACE PRESSURE GRADIENT
TIGHTENS UP AHEAD OF THE TROUGH AXIS. THE STRONGEST WINDS WILL BE OVER
EASTERN OREGON AT 15-20 KTS. THE TROUGH WILL BRING A DRY COLD FRONT
ACROSS THE AREA EARLY FRIDAY MORNING AND SWITCH WINDS TO NORTHWEST WITH
STRONGER WINDS IN THE UPPER TREASURE AND MAGIC VALLEYS. THESE WINDS WILL
HELP TO CLEAR SMOKE OUT OF THE VALLEYS BEFORE BUILDING BACK IN OVER THE
WEEKEND. A SIGNIFICANT COOL DOWN IS ALSO IN STORE FOR FRIDAY...MAX TEMPS
FORECAST TO BE 5-10 DEGREES BELOW NORMAL ACROSS THE AREA. FORECAST IS ON
TRACK AND NO UPDATES ARE NEEDED THIS MORNING.

&&

.AVIATION...IFR CONDITIONS IN THE BOISE MTN VALLEYS WITH LOCAL MVFR
IN THE SNAKE RIVER PLAIN THIS MORNING...INCLUDING THE KBOI
TERMINAL...WILL CONTINUE THROUGH THE AFTERNOON.
ALSO...WEST-SOUTHWEST WINDS ALOFT TO 20 KTS WILL BRING SMOKE LAYERS
BACK TO SE OREGON AND SW IDAHO TODAY.  CONDITIONS IMPROVE ON FRIDAY
IN GUSTY WEST WINDS BEHIND A DRY COLD FRONTAL PASSAGE...BUT REDUCED
VISIBILITY IN SMOKE WILL RETURN OVER THE WEEKEND. W-NW WINDS TO 20
KTS SURFACE AND ALOFT TODAY.

&&

.AIR STAGNATION...WILL CONTINUE TO HAVE TWO MAIN SOURCE REGIONS OF
SMOKE LAYERS ACROSS SOUTHEAST OREGON AND SOUTHWEST IDAHO. THIS
INCLUDES SURFACE SMOKE MAINLY FROM CENTRAL IDAHO /FEATHERVILLE
STANLEY AND NORTH FORK/ DUE TO NIGHTTIME DRAINAGE WINDS AS WELL AS
LAYERS MAINLY ALOFT FROM NORTH CALIFORNIA...NW NV AND OREGON DUE
TO MAINLY SOUTHWEST WINDS ALOFT. INCREASING WEST FLOW TONIGHT AND
FRIDAY WILL LIMIT SMOKE TO CENTRAL IDAHO AND NEAR THE NEVADA
BORDER. STILL ANTICIPATE THAT BY THE WEEKEND...WEAKENING WINDS
WILL ALLOW FOR OVERNIGHT SURFACE DRAINAGE FLOW TO BRING SMOKE BACK
INTO THE LOWER VALLEYS FROM CENTRAL IDAHO FIRES...AND A SWITCH TO
SOUTHWEST FLOW ALOFT WILL BRING MORE SMOKE TO THE AREA FROM
CALIFORNIA/NEVADA/OREGON.

&&

.PREV DISCUSSION...
SHORT TERM...TODAY THROUGH FRIDAY...AN APPROACHING DRY UPPER
TROUGH WILL INCREASE WINDS OUT OF THE SW TODAY ESPECIALLY OVER
OREGON WHERE GUSTS UP TO 30 MPH ARE EXPECTED IN THE MID AFTERNOON.
THE DRY TROUGH WILL CROSS THE AREA TONIGHT INTO EARLY FRIDAY WITH
A SHIFT TO WEST WINDS. A DRY SLOT WILL DESCEND OVER THE REGION
FRIDAY AFTERNOON WITH OREGON GETTING DECREASING WINDS BUT IDAHO
STILL GETTING GUSTS TO AROUND 30 MPH.

LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY...UPPER RIDGE REBUILDS
OVER THE WESTERN U.S OVER THE WEEKEND INTO EARLY NEXT WEEK. WARM SW
FLOW WILL HAVE TEMPERATURES 5-8 DEGREES ABOVE NORMAL FOR SUNDAY AND
MONDAY. SOME MILD-LEVEL MOISTURE MAKES IT INTO SW IDAHO ON SUNDAY...
BUT ATMOSPHERE IS TOO STABLE TO SUPPORT ANY AFTERNOON CONVECTION SO
DON/T SEE ANY CHANCE FOR PRECIPITATION INTO EARLY NEXT WEEK. MODELS
AGREE ON THE UPPER RIDGE BREAKING DOWN NEXT WEEK BUT DON/T AGREE ON
THE TIMING. WITH FAVORABLE FIRE CONDITIONS /DRY AND HOT/...RETURN OF
SW FLOW ALOFT AND A WEAK SURFACE GRADIENT...SMOKE WILL RETURN TO THE
VALLEYS OF SW IDAHO OVER THE WEEKEND.

&&

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

WEATHER.GOV/BOISE

DISCUSSION...CB
AVIATION.....JDS
AIR STAGNATION...VM
PREV SHORT TERM...VM
PREV LONG TERM....DG

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BOISE ID
528 AM MDT THU AUG 23 2012

IDZ011>016-028>030-033-ORZ061>064-241130-
WEST CENTRAL MOUNTAINS-LOWER TREASURE VALLEY ID-BOISE MOUNTAINS-
UPPER TREASURE VALLEY-SOUTHWEST HIGHLANDS-WESTERN MAGIC VALLEY-
CAMAS PRAIRIE-OWYHEE MOUNTAINS-SOUTHERN TWIN FALLS COUNTY-
UPPER WEISER RIVER-HARNEY COUNTY-BAKER COUNTY-MALHEUR COUNTY-
LOWER TREASURE VALLEY OR-
528 AM MDT THU AUG 23 2012 /428 AM PDT THU AUG 23 2012/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
IDAHO...SOUTHWEST IDAHO...WEST CENTRAL IDAHO...NORTHEAST OREGON
AND SOUTHEAST OREGON.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.