Flash Flood Warning 9, NWS Salt Lake City, UT

309 
WGUS75 KSLC 162220
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
420 PM MDT TUE JUL 16 2013

UTC007-015-170000-
/O.CON.KSLC.FF.W.0009.000000T0000Z-130717T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CARBON UT-EMERY UT-
420 PM MDT TUE JUL 16 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 600 PM MDT FOR
NORTHWESTERN EMERY AND SOUTHWESTERN CARBON COUNTIES...

ALTHOUGH RAINFALL HAS ENDED OVER THE SEELEY FIRE BURN SCAR RUNOFF 
WILL CONTINUE THROUGH 6 PM. A MUDSLIDE HAS BEEN REPORTED ON STATE 
ROUTE 31 BETWEEN MILE MARKER 24 AND 34. 

LOCATIONS IN THE WARNING INCLUDE HUNTINGTON CANYON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A DEBRIS FLOW HAS OCCURRED AND IT IS IMPORTANT REALIZE THAT THE 
RUNOUT AREA REMAINS VERY DANGEROUS. ADDITIONAL DEBRIS FLOWS MAY 
OCCUR WITHIN MINUTES OF THE ORIGINAL FLOW. PLEASE REMAIN VIGILANT 
AND BE PREPARED TO TAKE SWIFT ACTION.

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 3954 11124 3964 11124 3966 11111 3935 11096
      3930 11101 3940 11123 3947 11124

$$

793 
WGUS75 KSLC 162357
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
557 PM MDT TUE JUL 16 2013

UTC007-015-170004-
/O.EXP.KSLC.FF.W.0009.000000T0000Z-130717T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CARBON UT-EMERY UT-
557 PM MDT TUE JUL 16 2013

...THE FLASH FLOOD WARNING WILL EXPIRE AT 600 PM MDT FOR NORTHWESTERN
EMERY AND SOUTHWESTERN CARBON COUNTIES...

ADDITIONAL SHOWERS AND THUNDERSTORMS COULD STILL IMPACT THE 
HUNTINGTON CANYON AND THE SEELEY BURN SCAR THROUGH THIS EVENING.

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 3954 11124 3964 11124 3966 11111 3935 11096
      3930 11101 3940 11123 3947 11124

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1028 AM MDT TUE JUL 16 2013

.SYNOPSIS...A WARM AND MOIST AIR MASS WILL REMAIN OVER THE EASTERN
GREAT BASIN THROUGH WEDNESDAY.  AS A HIGH PRESSURE CENTER ALOFT
MOVES WESTWARD TO NEVADA...A NORTHWEST FLOW WILL ADVECT DRIER AIR
INTO SOUTHWEST WYOMING AND AT LEAST THE NORTHWEST HALF OF UTAH THE
LATTER HALF OF THE WEEK.  MOISTURE WILL LIKELY REMAIN ENTRENCHED
OVER SOUTHEAST UTAH.

&&

.DISCUSSION...VERY DEEP MOISTURE ACROSS THE MAJORITY OF THE
EASTERN GREAT BASIN THIS MORNING WITH PWAT VALUES IN EXCESS OF 1
INCH THROUGHOUT AND PUSHING 1.5 INCHES IN PLACES. EXTENSIVE CLOUD
COVER STREAMING NORTH THROUGH CENTRAL PORTIONS AN EARLY INHIBITOR
TO CONVECTION BUT FLANKS SUPPORT TERRAIN CIRCULATION DEVELOPMENT
ACROSS CENTRAL/SOUTHERN UTAH COME MIDDAY. WEAK VORT MAX FAR
SOUTHWEST ALONG THE UT/NV BORDER ATTM PROGGED TO SLOWLY DRIFT
NORTH IN RAP13 INCREASING CONVECTIVE POTENTIAL ACROSS
WESTERN/NORTHERN PORTIONS THROUGH THE AFTERNOON INTO THIS EVENING
FROM SOUTH TO NORTH. HRRR-3KM INDICATES TERRAIN BASED
THUNDERSTORMS ALONG THE SPINE FIRST WITH NORTHERN COVERAGE
INCREASING WITH AFOREMENTIONED VORT LOBE POST 00Z.

ANTICIPATING QUITE AN ACTIVE DAY AS CONVECTION
INITIATES...PRIMARILY REGARDING LOCALLY HEAVY RAIN THREAT AND
HEIGHTENED FLASH FLOOD POTENTIAL ACROSS PRONE AREAS IN THE SOUTH
AND POSSIBLY BURN SCARS FURTHER NORTH. SPC SHORT RANGE ENSEMBLES
INDICATING SIGNIFICANT INSTABILITY DEVELOPING AND EXPECT FOCUS TO
BE ALONG CLOUD COVER FLANKS AS DIFFERENTIAL HEATING ENSUES
MIDDAY/AFTERNOON. THIN BUT DEEP CAPE TO PROMOTE DEEPER UPDRAFTS
THAN THE LAST FEW DAYS. SAID INCREASE TO BOTH INSTABILITY AND
MOISTURE SHOULD PROMOTE BOTH INCREASED AREAL COVERAGE AND
SIGNIFICANCE OF STORMS. UPDATED EARLIER TO INCREASE AFTERNOON POPS
ALONG THE TERRAIN AND ADJACENT VALLEYS MANY AREAS SOUTH OF
INTERSTATE 80...AND ADJUSTED CLOUD COVER TO MATCH RECENT TRENDS.

ON THE LARGER SCALE...WATER VAPOR SHOWING MUCH OF THE
INTERMOUNTAIN REGION DOMINATED BY HIGH PRESSURE...ANOMALOUS COLD
CORE UPPER LOW RETROGRADING FROM TEXAS PAN HANDLE INTO NEW MEXICO.
SAID LOW WILL SLOWLY DRIFT WEST/SOUTHWEST DRIVING MID LEVEL
EASTERLIES ACROSS CENTRAL/EASTERN UTAH AIDING MID LEVEL MOISTURE
CONVERGENCE TODAY BEFORE A HEIGHTENED SOUTHWEST TRACK WILL PROMOTE
A MORE SOUTH/SOUTHEAST FLOW IN 24 HOURS TIME. GLOBAL MODELS
INDICATE HIGH PRESSURE TO CENTER OVER THE STATE THEN BULGE WEST
ALLOWING A DRYER NORTHWESTERLY FLOW TO PIN MOISTURE ACROSS THE FAR
SOUTH/EAST COME LATE WEEK.

&&

.AVIATION...OPERATIONAL WEATHER CONCERNS TO INCREASE THIS
AFTERNOON AND EVENING FOR THE KSLC TERMINAL. EXPECTING
THUNDERSTORMS TO BECOME MORE OF A THREAT THROUGH THAT TIME
POTENTIALLY SPIKING IN THE 23Z-05Z TIMEFRAME. A 40 PERCENT CHANCE
EXISTS FOR GUSTY OUTFLOW WINDS AND A 30 PERCENT CHANCE EXISTS FOR
DIRECT IMPACT DUE TO LIGHTNING.

SURFACE WINDS EXPECTED TO REMAIN SOUTHERLY THROUGH THE
DAY...THOUGH A 30 PERCENT CHANCE EXISTS FOR A NORTHWEST SWITCH DUE
TO THE LAKE BREEZE IN THE 19-23Z WINDOW. CLOUD COVER INHIBITING
THIS ATTM BUT WILL MONITOR.

&&

.FIRE WEATHER...A MORE MOIST AIRMASS HAS MOVED OVER THE STATE IN THE
LAST 24 HOURS...AND WILL LIKELY LEAD TO INCREASED COVERAGE OF
SHOWERS AND THUNDERSTORMS THIS AFTERNOON...AS WELL AS SOMEWHAT
HIGHER RELATIVE HUMIDITY VALUES COMPARED TO THE LAST FEW DAYS.
THUNDERSTORM DEVELOPMENT MAY BE DELAYED IN SOME AREAS WITH EXTENSIVE
CLOUD COVER THROUGH THE MORNING HOURS...BUT DEVELOPMENT SHOULD STILL
OCCUR BY MID AFTERNOON. WINDS SHOULD REMAIN LIGHT...ALTHOUGH
GUSTY AND ERRATIC WINDS ARE POSSIBLE IN AREAS OF THUNDERSTORM
DEVELOPMENT. WETTING RAIN POTENTIAL IS HIGH ENOUGH TO LIMIT
POTENTIAL IGNITION DUE TO LIGHTNING STRIKES.

THIS DEEPLY MOIST AIRMASS WILL LINGER THROUGH WEDNESDAY...BEFORE A
DRYING FROM THE NORTHWEST BEGINS ON THURSDAY. THIS WILL LEAD TO
SIGNIFICANTLY LOWER RH VALUES FOR THE END OF THE WEEK AND HEADING
INTO THE WEEKEND...WITH ANY THUNDERSTORM DEVELOPMENT LIKELY
CONSTRICTED TO THE FAR SOUTHERN AND EASTERN PORTIONS OF THE STATE.

&&

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

MERRILL/VERZELLA

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
413 AM MDT TUE JUL 16 2013

UTZ001>016-019>021-517-518-WYZ021-171015-
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-
413 AM MDT TUE JUL 16 2013

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS WILL AGAIN BE THE RULE THIS
AFTERNOON AND EVENING. A FEW MAY PRODUCE LOCALLY HEAVY RAINFALL
AND FLASH FLOODING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

SOME POTENTIAL FOR LOCALLY HEAVY RAINFALL AND FLASH FLOODING WILL
STILL EXIST ON WEDNESDAY.

HIGH TEMPERATURES WILL BE AT OR CLOSE TO TRIPLE DIGITS ACROSS
MANY VALLEY LOCATIONS THROUGHOUT THE PERIOD.

.SPOTTER INFORMATION STATEMENT...

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

BARJENBRUCH

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