Red Flag Warning 9, NWS Salt Lake City, UT

000 
WWUS85 KSLC 141048
RFWSLC

RED FLAG WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
448 AM MDT FRI AUG 14 2009

UTZ420-141900-
/O.CON.KSLC.FW.W.0009.090814T1800Z-090815T0600Z/
GREAT SALT LAKE DESERT AND MOUNTAINS-
448 AM MDT FRI AUG 14 2009

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO MIDNIGHT
MDT TONIGHT...

A RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO MIDNIGHT
MDT TONIGHT FOR LOW HUMIDITIES AND GUSTY WINDS FOR FIRE WEATHER
ZONE 420.

THE COLD PACIFIC TROUGH OVER THE PACIFIC NORTHWEST WILL MOVE EAST
ACROSS THE NORTHERN ROCKIES AND NORTHERN GREAT BASIN TODAY THROUGH
SATURDAY. THE ASSOCIATED SURFACE COLD FRONT WILL MOVE EAST INTO
EXTREME NORTHWEST UTAH LATE FRIDAY...THEN SWEEP SOUTHEAST ACROSS
NORTHERN UTAH LATE FRIDAY AND EARLY SATURDAY. LOW HUMIDITIES AND
STRONG SOUTHWESTERLY WINDS AHEAD OF THE FRONT WILL BE FOLLOWED BY
A PERIOD OF STRONG WESTERLY WINDS. THE WINDS WILL SUBSIDE LATE
FRIDAY EVENING...WITH HUMIDITIES INCREASING BEHIND THE COLD FRONT.

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.

&&

$$

UTZ434-435-439-141900-
/O.CON.KSLC.FW.W.0009.090814T1800Z-090815T0300Z/
WEST CENTRAL DESERTS AND MOUNTAINS-
SOUTHWEST DESERTS AND MOUNTAINS-UTAHS DIXIE AND ZION CANYON-
448 AM MDT FRI AUG 14 2009

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 9 PM MDT
THIS EVENING...

A RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 9 PM MDT
THIS EVENING FOR LOW HUMIDITIES AND GUSTY WINDS FOR FIRE WEATHER
ZONE 434...435 AND 439.

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A FIRE
WEATHER WATCH...WHICH WILL BE IN EFFECT FROM NOON FRIDAY THROUGH
900 PM FRIDAY EVENING. THIS WATCH IS FOR LOW HUMIDITIES AND GUSTY
WINDS FOR FIRE WEATHER ZONES 434...435...AND 439.

A COLD PACIFIC TROUGH OVER THE PACIFIC NORTHWEST WILL MOVE EAST
ACROSS THE NORTHERN ROCKIES AND NORTHERN GREAT BASIN TONIGHT
THROUGH SATURDAY. THE ASSOCIATED SURFACE COLD FRONT WILL MOVE INTO
NORTHWEST UTAH LATE FRIDAY AFTERNOON...THEN SWEEP SOUTHEAST ACROSS
THE STATE THROUGH SATURDAY. STRONG SOUTHERLY WINDS WILL DEVELOP
BY AFTERNOON WITH LOW HUMIDITIES ALREADY IN PLACE ACROSS THE
REGION. WINDS WILL GRADUALLY SUBSIDE FRIDAY EVENING... WITH
HUMIDITIES INCREASING BEHIND THE FRONTAL PASSAGE.

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.

&&

$$

FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)

000 
WWUS85 KSLC 141838
RFWSLC

RED FLAG WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1238 PM MDT FRI AUG 14 2009

UTZ420-150600-
/O.CON.KSLC.FW.W.0009.000000T0000Z-090815T0600Z/
GREAT SALT LAKE DESERT AND MOUNTAINS-
1238 PM MDT FRI AUG 14 2009

...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT
TONIGHT FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR UTAH FIRE WEATHER
ZONE 420...

A RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT
FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR UTAH FIRE WEATHER
ZONE 420.

THE COLD PACIFIC TROUGH OVER THE PACIFIC NORTHWEST WILL MOVE EAST
ACROSS THE NORTHERN ROCKIES AND NORTHERN GREAT BASIN THIS
AFTERNOON THROUGH SATURDAY. THE ASSOCIATED SURFACE COLD FRONT
WILL MOVE EAST INTO EXTREME NORTHWEST UTAH LATE TONIGHT...THEN
SWEEP SOUTHEAST ACROSS NORTHERN UTAH LATE TONIGHT THROUGH EARLY
TOMORROW. LOW HUMIDITIES AND STRONG SOUTHWESTERLY WINDS AHEAD OF
THE FRONT WILL BE FOLLOWED BY A PERIOD OF STRONG WEST TO
NORTHWESTERLY WINDS. THE WINDS WILL SUBSIDE LATE FRIDAY
EVENING...WITH HUMIDITIES INCREASING BEHIND THE COLD FRONT.

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.

&&

$$

UTZ434-435-439-150300-
/O.CON.KSLC.FW.W.0009.000000T0000Z-090815T0300Z/
WEST CENTRAL DESERTS AND MOUNTAINS-
SOUTHWEST DESERTS AND MOUNTAINS-UTAHS DIXIE AND ZION CANYON-
1238 PM MDT FRI AUG 14 2009

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR UTAH FIRE WEATHER
ZONES 434...435...AND 439...

A RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING
FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY FOR UTAH FIRE WEATHER
ZONES 434...435...AND 439.

A COLD PACIFIC TROUGH OVER THE PACIFIC NORTHWEST WILL MOVE EAST
ACROSS THE NORTHERN ROCKIES AND NORTHERN GREAT BASIN TONIGHT
THROUGH SATURDAY. THE ASSOCIATED SURFACE COLD FRONT WILL MOVE
INTO NORTHWEST UTAH THIS EVENING...THEN SWEEP SOUTHEAST ACROSS
THE STATE THROUGH SATURDAY. STRONG SOUTHERLY WINDS WILL DEVELOP
THIS AFTERNOON WITH LOW HUMIDITIES ALREADY IN PLACE ACROSS THE
REGION. WINDS WILL GRADUALLY SUBSIDE TONIGHT... WITH HUMIDITIES
INCREASING BEHIND THE FRONTAL PASSAGE.

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.

&&

$$

FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
951 AM MDT THU AUG 13 2009

.SYNOPSIS...SOUTHWEST FLOW WILL DRAW MOISTURE NORTH INTO MAINLY
SOUTHERN AND EASTERN UTAH TODAY. A PACIFIC STORM SYSTEM WILL CROSS
THE NORTHERN ROCKIES FRIDAY AND SATURDAY SENDING A COLD FRONT
THROUGH UTAH.

&&

.DISCUSSION...THE FORECAST AREA IS SITUATED BETWEEN A RIDGE
CENTERED OVER COLORADO AND NEW MEXICO AND A TROUGH MOVING ONSHORE
ALONG THE PACIFIC NORTHWEST COAST. THIS IS ALLOWING FOR INCREASED
SOUTHWEST FLOW...WHICH HAS ALLOWED MOISTURE TO SPREAD ACROSS MUCH
OF THE STATE. PWS ARE GREATEST OVER SOUTHEASTERN UTAH...WHERE
SATELLITE DERIVED VALUES ARE OVER AN INCH...BUT 0.6 TO 0.7 INCH
VALUES ARE COMMON EVEN ACROSS NORTHERN UTAH.

AS THE PACIFIC NORTHWEST TROUGH CONTINUES INLAND TODAY...IT WILL
PUSH A DRIER AIRMASS OVER WESTERN UTAH BY THIS EVENING.
STILL...ENOUGH MOISTURE SHOULD BE IN PLACE FOR A FEW HIGH BASED
THUNDERSTORMS TO POP UP THIS AFTERNOON. CONVECTION WILL BE MORE
SCATTERED IN NATURE OVER SOUTHEASTERN UTAH AND THE HIGHER TERRAIN
OF THE EASTERN HALF OF THE STATE. ADDITIONALLY...THE SOUTHWEST
FLOW SHOULD KEEP TEMPERATURES QUITE WARM...AROUND CLIMO OVER THE
SOUTH AND OVER 5F ABOVE CLIMO OVER THE NORTH.

MODELS INDICATE THAT DRIER AIR WILL SPREAD OVER ALL BUT FAR
SOUTHEASTERN UTAH BY TOMORROW AFTERNOON...LIMITING CONVECTIVE
DEVELOPMENT OVER THE WESTERN HALF OF UTAH. THIS COMBINED WITH
INCREASING SOUTHWEST FLOW COULD RESULT IN SEVERE FIRE WEATHER
CONDITIONS. SEE THE FIRE WEATHER SECTION FOR MORE DETAILS.

THE TROUGH IS EXPECTED TO BRING AN UNSEASONABLY STRONG COLD FRONT
INTO THE NORTHERN TWO THIRDS OF THE FORECAST AREA FRIDAY NIGHT AND
SATURDAY. INITIAL FRONTAL PASSAGE SHOULD BE DRY...BUT GOOD
DYNAMICS AND A BIT OF MOISTURE SHOULD ACCOMPANY THE UPPER TROUGH
AS IT MOVES ACROSS NORTHERN UTAH DURING THE DAY SATURDAY.
MAX TEMPS...ESPECIALLY OVER NORTHERN UTAH...SHOULD RUN NOTICEABLY
BELOW CLIMO ON BOTH SATURDAY AND SUNDAY.

NO UPDATES EXPECTED TO THE FORECAST THIS MORNING.

&&

.AVIATION...LIGHT SOUTHEAST SURFACE WINDS WILL TURN MORE SOUTHERLY
AND INCREASE LATE THIS MORNING. A LATE SHIFT TO THE NORTHWEST
BETWEEN 21-23Z IS EXPECTED AT THE SLC...WITH A RETURN TO SOUTHERLY
WINDS BETWEEN 02-03Z. VFR CONDITIONS THROUGH THE DAY...WITH A 10
PERCENT CHANCE OF A THUNDERSTORM IMPACTING THE AIRPORT AFTER 20Z.

&&

.FIRE WEATHER... HIGH PRESSURE ALOFT OVER THE SRN ROCKIES WILL
CONTINUE TO PUMP MOISTURE THROUGH SRN/CNTRL UTAH TODAY. DRIER AIR
WILL GRADUALLY WORK THROUGH THE STATE LATER TODAY THROUGH FRIDAY
AHEAD OF ANOTHER COLD PACIFIC TROUGH APPROACHING FROM THE PACIFIC
NORTHWEST. THE ASSOCIATED SURFACE COLD FRONT WILL MOVE THROUGH ERN
NV FRIDAY...LEADING TO STRONG WINDS AND LOWERING RH VALUES ACROSS
THE WRN FIRE WEATHER ZONES. A FIRE WEATHER WATCH IS IN EFFECT FOR
THE LOWER SW UTAH ZONES. THE COLD FRONT WILL SWEEP SOUTH THROUGH
THE STATE FRIDAY NIGHT THROUGH SATURDAY BRINGING MUCH COOLER
TEMPERATURES FOR THE WEEKEND. ANY PRECIPITATION ASSOCIATED WITH
THE FRONT WILL LIKELY REMAIN OVER FAR NRN UTAH...WITH LITTLE OR NO
THREAT FOR PRECIPITATION BY THE TIME THE FRONT REACHES CNTRL UTAH.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...FIRE WEATHER WATCH FROM NOON FRIDAY TO 9 PM FRIDAY FOR UTAH
     FIRE WEATHER ZONES 434...435...AND 439.

WY...NONE.

&&

PUBLIC...TRAPHAGAN
AVIATION/FIRE WX...CONGER

FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
446 AM MDT THU AUG 13 2009

UTZ001>016-019>021-517-518-WYZ021-141200-
CACHE VALLEY/UTAH PORTION-NORTHERN WASATCH FRONT-
SALT LAKE AND TOOELE VALLEYS-SOUTHERN WASATCH FRONT-
GREAT SALT LAKE DESERT AND MOUNTAINS-WASATCH MOUNTAIN VALLEYS-
WASATCH MOUNTAINS I-80 NORTH-WASATCH MOUNTAINS SOUTH OF I-80-
WESTERN UINTA MOUNTAINS-WASATCH PLATEAU/BOOK CLIFFS-
WESTERN UINTA BASIN-CASTLE COUNTRY-SAN RAFAEL SWELL-
SANPETE/SEVIER VALLEYS-WEST CENTRAL UTAH-SOUTHWEST UTAH-
UTAHS DIXIE AND ZION NATIONAL PARK-SOUTH CENTRAL UTAH-
GLEN CANYON RECREATION AREA/LAKE POWELL-CENTRAL MOUNTAINS-
SOUTHERN MOUNTAINS-SOUTHWEST WYOMING-
446 AM MDT THU AUG 13 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO THIRDS OF
UTAH AND SOUTHWEST WYOMING.

.DAY ONE...TODAY AND TONIGHT

INCREASING MOISTURE WILL RESULT IN THUNDERSTORMS WITH BRIEF HEAVY
RAIN ACROSS THE SOUTHEAST TODAY. ELSEWHERE ACROSS THE
AREA...ISOLATED HIGH-BASED THUNDERSTORMS COULD RESULT IN GUSTY
WINDS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

SOUTH TO SOUTHWEST WINDS WILL INCREASE ACROSS MUCH OF THE AREA
FRIDAY AHEAD OF AN APPROACHING STORM SYSTEM. DRIER AIR SPREADING
INTO WESTERN UTAH WILL COMBINE WITH THE WINDS TO RESULT IN SEVERE
FIRE WEATHER CONDITIONS.

THE STORM SYSTEM WILL PUSH A COLD FRONT INTO NORTHERN AND CENTRAL
UTAH FRIDAY NIGHT...USHERING IN MUCH COOLER TEMPERATURES FOR THE
WEEKEND.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)