Flash Flood Warning 52, NWS Salt Lake City, UT

097 
WGUS75 KSLC 212319
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
519 PM MDT WED AUG 21 2013

UTC025-220330-
/O.CON.KSLC.FF.W.0052.000000T0000Z-130822T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
519 PM MDT WED AUG 21 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM MDT FOR 
JOHNSON WASH IN CENTRAL KANE COUNTY...

AT 512 PM MDT...FLASH FLOODING WAS LIKELY CONTINUING ALONG JOHNSON 
WASH WITHIN CENTRAL KANE COUNTY...INCLUDING ALONG SKUTUMPAH ROAD. 
NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATES A WIDESPREAD ONE 
HALF TO 1 INCH OF RAIN HAS FALLEN ACROSS THE DRAINAGE...WITH LOCALLY 
OVER 2 INCHES. 

ALTHOUGH HEAVY RAINFALL WILL CONTINUE TO TAPER OFF...FLOODING IS 
EXPECTED TO CONTINUE THROUGH THE REMAINDER OF THE EVENING AS THE 
FLOOD WAVE WORK ITS WAY SOUTH ALONG JOHNSON WASH.  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3718 11245 3730 11243 3738 11241 3740 11232
      3733 11227 3700 11235 3700 11240

$$

MPS

355 
WGUS75 KSLC 220328
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
928 PM MDT WED AUG 21 2013

UTC025-220337-
/O.EXP.KSLC.FF.W.0052.000000T0000Z-130822T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
928 PM MDT WED AUG 21 2013

...THE FLASH FLOOD WARNING WILL EXPIRE AT 930 PM MDT FOR CENTRAL KANE
COUNTY...

RUNOFF FROM EARLIER PRECIPITATION HAS LIKELY DIMINISHED WITHIN 
JOHNSON WASH. THEREFORE... THE FLASH FLOOD WARNING WILL BE ALLOWED 
TO EXPIRE. MONITOR NOAA WEATHER RADIO OR LOCAL TELEVISION OR RADIO 
FOR THE LATEST WEATHER INFORMATION.

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 3718 11245 3730 11243 3738 11241 3740 11232
      3733 11227 3700 11235 3700 11240

$$

MPS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1124 AM MDT WED AUG 21 2013

.SYNOPSIS...THE AIRMASS ACROSS THE REGION WILL DRY A LITTLE
THROUGH THE END OF THE WEEK. MOISTURE WILL RETURN BY SUNDAY AND
REMAIN THROUGH THE FIRST PART OF NEXT WEEK.

&&

.DISCUSSION...UT REMAINS UNDER THE WRN PERIPHERY OF THE LARGE HIGH
OVER THE SOUTH CENTRAL AND SWRN US WITH A CLOSED LOW STILL PARKED
OFF THE CENTRAL CA COAST.

A SHEARING SHORT WAVE TROF LIFTED THRU NRN UT EARLY THIS MORNING AND
HAS NOW LIFTED NORTH OF THE CWA. EXPECT SUBSIDENCE IN THE WAKE OF
THIS FEATURE COMBINED WITH THE RIDGE EXPANDING NWWD TO LIMIT
CONVECTION OVER THE NORTH THIS AFTN.

STILL EXPECT TERRAIN BASED CELLS AREA WIDE THIS AFTN/EVE BUT THE
BETTER COVERAGE SHOULD BE ACROSS THE SOUTH. THE AIRMASS HAS DRIED
SLIGHTLY BUT REMAINS MOIST ENOUGH FOR STRONGER STORMS TO GENERATE
HEAVY RAIN AND A POTENTIAL FOR ISOLATED FLASH FLOODING.

MODELS HAVE BEEN ADVERTISING A SHORT WAVE TROF MOVING NORTH THRU THE
GREAT BASIN TOMORROW IN PHASE WITH THE CA LOW AS IT LIFTS N BUT THE
LATEST GFS HAS SORT OF GIVEN UP ON THIS FEATURE. STILL SUSPECT THERE
WILL BE A WAVE ENHANCING CONVECTION TOMORROW ACROSS THE CWA AS THERE
IS A SHORT WAVE NOTED IN WATER VAPOR IMAGERY OVER SWRN AZ AT THIS
TIME.

MODELS ALSO DO NOT SEEM TO BE PICKING UP ON AN APPARENT VORT MAX
ALSO NOTED IN WATER VAPOR IMAGERY SOUTH OF THE CA LOW. WOULD EXPECT
THIS TO LIFT UP THE EAST SIDE OF THE LOW OVER THE NEXT 24 HRS OR SO
POSSIBLY ENHANCING THE SWRN AZ WAVE. BOTTOM LINE IS THAT I EXPECT A
MORE ACTIVE DAY TOMORROW ACROSS THE CWA.

DRYING BEHIND THESE WAVE IS SUBTLE FOR FRI AND EXPECT MORE TERRAIN
BASED ACTIVITY BUT A LITTLE STRONGER FOR SAT...ALTHO THERE WILL
STILL BE A THREAT OF TERRAIN BASED CELLS. MOISTURE IS STILL FORECAST
TO RETURN SUNDAY BUT NOW IS SHIFTED WEST IN THE NEW GFS.

FOR NOW...UPDATED FORECASTS TO LOWER POPS AND REDUCE SKY COVER A BIT
THE REST OF THE MORNING. MAY NEED TO UPDATE AGAIN TO LOWER POPS EVEN
MORE FOR THE NORTH BUT WILL MONITOR DEVELOPMENT FOR A LITTLE LONGER.

&&

.AVIATION...THERE IS A 20 PERCENT CHANCE OF THUNDERSTORMS
IMPACTING THE SLC TERMINAL WITH GUSTY ERRATIC WINDS AFTER ABOUT
21Z TODAY. THERE IS LESS THAN A 10 PERCENT CHANCE OF A STORM
DIRECTLY IMPACTING THE TERMINAL WITH NEARBY CLOUD- TO- GROUND
LIGHTNING AND BRIEF HEAVY RAIN. SURFACE WINDS ARE EXPECTED TO
SWITCH TO THE NORTHWEST BETWEEN 18Z AND 20Z TODAY...WITH A SLIGHT
CHANCE THAT THE WIND SWITCH COULD OCCUR BEFORE 18Z. WINDS WILL
RETURN TO SOUTHEASTERLY AROUND 03-04Z.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...NONE.
WY...NONE.
&&

WILENSKY

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

FOR FREQUENTLY ASKED QUESTIONS ABOUT THE AREA FORECAST DISCUSSION
VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY/GENERAL/AFD_FAQS.PHP (ALL LOWER CASE)

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
328 PM MDT WED AUG 21 2013

UTZ001>016-019>021-517-518-WYZ021-221200-
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-
328 PM MDT WED AUG 21 2013

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

SHOWERS AND THUNDERSTORMS WILL PERSIST ACROSS MAINLY THE CENTRAL AND
SOUTHERN OUTLOOK AREA THROUGH THIS EVENING WITH A FEW STORMS
CONTINUING THROUGH THE NIGHT ACROSS THE SOUTHEAST. SOME OF THESE
STORMS WILL PRODUCE LOCAL HEAVY RAIN AND ISOLATED FLASH FLOODING IS
POSSIBLE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

MORE NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED ON THURSDAY
ACROSS MOST OF THE OUTLOOK AREA...MAINLY IN THE AFTERNOON AND
EVENING. A LITTLE LESS THUNDERSTORM ACTIVITY IS FORECAST FOR
FRIDAY AND SATURDAY. DEEP MOISTURE IS EXPECTED TO MOVE BACK INTO
THE AREA STARTING SUNDAY AND REMAIN THROUGH EARLY NEXT WEEK
BRINGING ANOTHER INCREASE IN THUNDERSTORM ACTIVITY AND THE
ASSOCIATED THREAT OF FLASH FLOODING.

.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)

FOR INFORMATION ON POTENTIAL TRAVEL IMPACTS VISIT...
HTTP://WWW.UDOTTRAFFIC.UTAH.GOV/ROADWEATHERFORECAST.ASPX