Flash Flood Warning 22, NWS Salt Lake City, UT

000 
WGUS75 KSLC 081825
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1223 PM MDT FRI AUG 8 2008

UTC017-082200-
/O.CON.KSLC.FF.W.0022.000000T0000Z-080808T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-
1223 PM MDT FRI AUG 8 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 PM MDT FOR
NORTHEASTERN GARFIELD COUNTY...

AT 1000 AM MDT...NATIONAL WEATHER SERVICE REMOTE RIVER GAGES 
INDICATE FLASH FLOODING OVER THE WARNED AREA ALONG THE DIRTY DEVIL 
RIVER. 

HIGH WATER WILL CONTINUE TO AFFECT THE DIRTY DEVIL RIVER NEAR HITE 
MARINA THROUGH MUCH OF THE AFTERNOON.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

LAT...LON 3794 11043 3815 11045 3814 11030 3792 11032
      3789 11034 3788 11039 3786 11042 3783 11043
      3784 11046
TIME...MOT...LOC 1823Z 180DEG 0KT 3794 11039

$$

KRUSE

000 
WGUS75 KSLC 082154
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
350 PM MDT FRI AUG 8 2008

UTC017-082200-
/O.EXP.KSLC.FF.W.0022.000000T0000Z-080808T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD UT-
353 PM MDT FRI AUG 8 2008

...THE FLASH FLOOD WARNING WILL EXPIRE AT 400 PM MDT FOR NORTHEASTERN
GARFIELD COUNTY...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS 
SAFELY.

THE MAIN FLOOD OF WATER THAT PASSED DOWN THE DIRTY DEVIL RIVER TODAY 
WILL FLOW INTO LAKE POWELL WITH THE RIVER SLOWLY SUBSIDING. 
THUNDERSTORMS PRODUCING LOCAL HEAVY RAIN WILL CONTINUE ACROSS THE 
AREA THROUGH THE EVENING.

LAT...LON 3794 11043 3815 11045 3814 11030 3792 11032
      3789 11034 3788 11039 3786 11042 3783 11043
      3784 11046

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
509 AM MDT FRI AUG 8 2008

.SYNOPSIS...DEEP SUBTROPICAL MOISTURE WILL REMAIN IN PLACE THROUGH
TODAY AND THEN GRADUAL DRYING WILL OCCUR OVER THE WEEKEND.

&&

.DISCUSSION...HIGH PRESSURE REMAINS CENTERED TO OUR SOUTHEAST THIS
MORNING WITH A GENERAL LIGHT SOUTHWESTERLY FLOW ALOFT OVER THE
AREA. DEEP MOISTURE ALSO REMAINS IN PLACE AND SHOULD RESULT IN
ANOTHER ROUND OF THUNDERSTORMS AND LOCAL HEAVY RAIN. A COUPLE OF
SHORT WAVE FEATURES SHOULD AFFECT CONVECTIVE COVERAGE. ONE OF
THESE IS THE WEAK UPPER LOW OVER NERN UT LIFTING INTO WY THIS
MORNING AND THE OTHER A VORT MAX LIFTING OUT OF NV INTO SWRN ID
WITH AN ELONGATED VORT LOBE TRAILING SOUTH TO THE LOWER COLORADO
RIVER VALLEY.

ALTHO RIDGING WILL TEND TO DEVELOP OVER NRN UT TODAY IN THE WAKE
OF THE DEPARTING NERN UT LOW...THE NV VORT LOBE MOVES THROUGH THIS
RIDGE THROUGH EARLY AFTERNOON AND SHOULD ALLOW CONVECTION TO
DEVELOP...THEN GET SUPPRESSED LATE IN THE DAY.  OVER THE
SOUTH...THE NV WAVE WILL ALSO ASSIST CONVECTION THROUGH MID TO
LATE AFTERNOON. THIS WAVE WILL BE MOVING INTO THE EAST LATE IN THE
DAY AND SHOULD PRODUCE THE STRONGEST CONVECTION THERE. THIS
COMBINED WITH THE MOIST AIRMASS PROMPTED THE ISSUANCE OF A FLASH
FLOOD WATCH ONCE AGAIN FOR TODAY FOR ABOUT THE EASTERN HALF OF THE
FORECAST AREA.

THE FLOW ALOFT VEERS A BIT FOR SAT BEGINNING A DRYING TREND BUT
SOME INCREASE IN DYNAMIC SUPPORT AND ADEQUATE MOISTURE SHOULD
RESULT IN ANOTHER ROUND OF STORMS FOR MOST OF THE AREA...WITH
MAYBE NOT QUITE AS MUCH RAIN. THE DRYING TREND CONTINUES SUNDAY
BUT WITH EVEN MORE UPPER SUPPORT SO HAVE KEPT LOW POPS IN THE
FORECAST FOR NORTHWESTERN PORTIONS.

DRYING INCREASES SUN NIGHT THRU MON AS A PACIFIC SHORT WAVE TROF
RIDES THRU THE NRN ROCKIES AND SENDS A DRY WESTERLY FLOW INTO THE
FORECAST AREA. THIS SHOULD ELIMINATE MOST CONVECTION EXCEPT FOR
ISOLATED SMALL CELLS OVER THE MOUNTAIN SPINE OF UTAH.

THE 00Z GFS HAD MOISTURE RETURNING TO THE AREA BY THU BUT THE NEW
06Z RUN LIMITS IT TO THE SOUTH THROUGH THE WEEK. THE 00Z EC ALSO
BRINGS MOISTURE BACK INTO THE ENTIRE AREA BY FRI SO HAVE NOT
CHANGED THE GRIDS BEYOND DAY 4 MUCH.

&&

.AVIATION...SOUTHERLY WINDS WILL PREVAIL AT THE SLC TERMINAL THROUGH
THE MORNING HOURS BEFORE SHIFTING TO THE NORTHWEST AROUND 18-20Z.
HOWEVER...AMPLE MOISTURE COUPLED WITH A WEAK DISTURBANCE WILL RESULT
IN A 30 PERCENT CHANCE OF SHOWERS AND THUNDERSTORMS IN THE AREA BY
LATE MORNING...WHICH COULD BRING ERRATIC WINDS TO THE TERMINAL...OR
AN EARLY WIND SHIFT. OCCASIONAL THUNDERSTORMS COULD CONTINUE THROUGH
THE AFTERNOON. OTHERWISE...PREVAILING VFR CONDITIONS ARE
EXPECTED...BUT THERE IS A 10 PERCENT CHANCE OF BRIEF CIGS OF
5000-6000FT AGL IN THE HEAVIER SHOWERS.

&&

.FIRE WEATHER...DEEP MOISTURE REMAINS OVER THE FIRE DISTRICT TODAY.
THIS WILL RESULT IN SCATTERED TO NUMEROUS WET THUNDERSTORMS OVER THE
AREA. THE AIRMASS DRIES SOMEWHAT FOR THE WEEKEND...BUT NOT ENOUGH TO
KEEP WIDELY SCATTERED TO SCATTERED THUNDERSTORMS FROM DEVELOPING
ACROSS THE FIRE DISTRICT. MOST THUNDERSTORMS THIS WEEKEND SHOULD
PRODUCE WETTING RAIN AS WELL...AND HUMIDITIES WILL LIKELY REMAIN
ABOVE CRITICAL IN MOST AREAS. A MORE SIGNIFICANT DRYING TREND CAN BE
EXPECTED TO BEGIN ON MONDAY.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...FLASH FLOOD WATCH FROM NOON FRIDAY TO 10 PM FRIDAY FOR UTZ009-
     UTZ010-UTZ011-UTZ012-UTZ013-UTZ020-UTZ021-UTZ517-UTZ518.

WY...NONE.

&&

WILENSKY/CHENG

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
539 AM MDT FRI AUG 8 2008

UTZ001>016-019>021-517-518-WYZ021-091100-
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-
539 AM MDT FRI AUG 8 2008

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

.DAY ONE...TODAY AND TONIGHT

DEEP MOISTURE REMAINS IN PLACE ACROSS THE OUTLOOK AREA TODAY WITH
SHOWERS AND THUNDERSTORMS EXPECTED YET AGAIN. HEAVY RAIN WILL
LIKELY ACCOMPANY SOME OF THE THUNDERSTORMS THAT DEVELOP THIS
AFTERNOON...ESPECIALLY OVER THE MOUNTAINS AND THE EAST. HEAVY
RUNOFF FROM THE LARGER STORMS COULD RESULT IN LOCAL FLASH
FLOODING. FLASH FLOOD PRONE AREAS SUCH AS DRY WASHES AND SLOT
CANYONS SHOULD BE AVOIDED.

SHOWERS AND THUNDERSTORMS WILL GRADUALLY END THIS EVENING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THE AIRMASS ACROSS THE OUTLOOK AREA WILL START TO DRY ON SATURDAY
BUT SUFFICIENT MOISTURE WILL REMAIN FOR ANOTHER DAY OF SHOWERS AND
THUNDERSTORMS. DRYING CONTINUES SUNDAY THROUGH MONDAY WITH LESS
THUNDERSTORM ACTIVITY EACH DAY...BECOMING LIMITED TO ISOLATED
SMALL STORMS OVER THE MOUNTAINS BY MONDAY AFTERNOON. THESE
GENERALLY DRY CONDITIONS WILL CONTINUE THROUGH MID WEEK.

.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)