Flash Flood Warning 37, NWS Salt Lake City, UT

091 
WGUS75 KSLC 280215
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
815 PM MDT SAT JUL 27 2013

UTC021-053-280430-
/O.CON.KSLC.FF.W.0037.000000T0000Z-130728T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-IRON UT-
815 PM MDT SAT JUL 27 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM MDT FOR
SOUTH CENTRAL IRON AND EAST CENTRAL WASHINGTON COUNTIES...

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 0.50 TO 0.75 INCHES 
OF RAIN FELL ACROSS CENTRAL PORTIONS OF ZION NATIONAL PARK OVER A 
20 MINUTE PERIOD. THE THUNDERSTORMS WHICH PRODUCED THIS RAINFALL 
WERE MOVING OUT OF THE PARK AS OF 810 PM...HOWEVER FLASH FLOODING 
WILL LIKELY CONTINUE THROUGH SLOT CANYONS WITHIN THE 
PARK...PARTICULARLY SPRY CANYON...PINE CREEK...CLEAR CREEK...AND 
KEYHOLE. HIGH FLOWS CAN ALSO BE EXPECTED THROUGH THE NARROWS. 

THIS THUNDERSTORM WITH EXCESSIVE RAIN WILL OTHERWISE REMAIN OVER
MAINLY RURAL AREAS OF THE INDICATED COUNTIES.

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 3750 11321 3750 11314 3738 11304 3737 11290
      3714 11291 3715 11309 3736 11322

$$

MPS

131 
WGUS75 KSLC 280311
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
911 PM MDT SAT JUL 27 2013

UTC021-053-280430-
/O.CON.KSLC.FF.W.0037.000000T0000Z-130728T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-IRON UT-
911 PM MDT SAT JUL 27 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM MDT FOR 
SOUTH CENTRAL IRON AND EAST CENTRAL WASHINGTON COUNTIES INCLUDING 
ZION NATIONAL PARK...

THUNDERSTORMS EARLIER THIS EVENING PRODUCED VERY HEAVY RAIN IN A 
SHORT PERIOD OF TIME. THIS EXCESSIVE RAIN FALL CAUSED FLASH FLOODING 
ON SEVERAL CREEKS AND DRY WASHES WITHIN ZION NATIONAL PARK INCLUDING 
HEATH CANYON...PINE CREEK...SPRY CREEK...KEY HOLE AND THE EMERALD 
POOLS AREA. FLASH FLOODING CONTINUES TO OCCUR IN HEATH CANYON. THE 
SCENIC DRIVE HAD AT LEAST THREE AREAS WHERE SAND COVERED THE ROAD 
AND REQUIRED PLOWS TO REMOVE THE SAND. 

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 3750 11321 3750 11314 3738 11304 3737 11290
      3714 11291 3715 11309 3736 11322

$$

MS

514 
WGUS75 KSLC 280421
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1021 PM MDT SAT JUL 27 2013

UTC021-053-280431-
/O.EXP.KSLC.FF.W.0037.000000T0000Z-130728T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-IRON UT-
1021 PM MDT SAT JUL 27 2013

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1030 PM MDT FOR SOUTH
CENTRAL IRON AND EAST CENTRAL WASHINGTON COUNTIES...

RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED GREATLY ACROSS ZION 
NATIONAL PARK. 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 3750 11321 3750 11314 3738 11304 3737 11290
      3714 11291 3715 11309 3736 11322

$$

MPS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
317 PM MDT SAT JUL 27 2013

.SYNOPSIS...MOISTURE HAS SPREAD ACROSS THE REGION AND WILL REMAIN
THROUGH THE WEEKEND. A DRYING TREND WILL FOLLOW FOR THE FIRST HALF
OF THE UPCOMING WEEK.

&&

.DISCUSSION...MOIST W/SW FLOW REMAINS IN PLACE OVER THE REGION
THIS AFTERNOON...AND THIS HAS BROUGHT DEEP MONSOONAL MOISTURE OVER
THE FORECAST AREA. SATELLITE DERIVED PW VALUES ARE RUNNING IN THE
1.2 TO 1.4 INCH RANGE ACROSS THE ENTIRE STATE...NEAR THE 99TH
PERCENTILE FOR MOISTURE THIS TIME OF YEAR. EMBEDDED SHORTWAVE HAS
MOVE INTO NORTHEAST UTAH...WHERE SOME MORE STRATIFORM TYPE PRECIP
IS MOVING THROUGH IN THICK CLOUD COVER. CLOUDS ARE SCATTERING OUT
OVER SOUTHERN UTAH...ALLOWING SHOWERS AND THUNDERSTORMS TO
DEVELOP. COVERAGE IS MUCH GREAT OVER NORTHERN ARIZONA WHICH DID
NOT HAVE MUCH CLOUD COVER THIS MORNING. WITH MORE THAN AMPLE
MOISTURE AND INSTABILITY...SHOWER AND THUNDERSTORM COVERAGE WILL
ONLY INCREASE THROUGH THIS EVENING AND HAS THE POTENTIAL TO LINGER
INTO THE OVERNIGHT HOURS. WITH SUCH ABUNDANT MOISTURE...THESE
STORMS WILL BE EXTREMELY EFFICIENT RAIN PRODUCERS WITH A HIGH
PROBABILITY OF LOCALLY HEAVY RAIN. WITH THIS IN MIND...HAVE GONE
WITH A FLASH FLOOD WATCH FOR SOUTHERN UTAH THAT GOES INTO THE
OVERNIGHT HOURS.

FLOW ALOFT WILL CONTINUE TO BECOME MORE WESTERLY AND EVEN A BIT
WNWLY AS THE RIDGE FLATTENS OUT AHEAD OF A TROUGH THAT WILL IMPACT
IDAHO TOMORROW EVENING. THIS WILL CAUSE SOME SLIGHT DRYING OVER
NORTHERN UTAH WHILE DEEP MOISTURE REMAINS IN PLACE OVER THE REST
OF THE FORECAST AREA. NOT EXPECTING ANY SIGNIFICANT SHORTWAVE
FORCING LIKE TODAY...WHICH WILL LIKELY LIMIT MORNING CLOUD COVER.
SO THOUGH INSTABILITY WILL BE MORE TERRAIN INDUCED...COULD SEE
BETTER COVERAGE DUE TO THE LACK OF CLOUD COVER. HEAVY RAIN WILL
REMAIN A THREAT WITH STORMS TOMORROW.

MODELS INDICATE A DRYING TREND WILL COMMENCE MONDAY. DRIER AIR
WILL MOVE IN FROM THE SOUTH...LIMITING CONVECTIVE ACTIVITY THERE.
HOWEVER...SCATTERED CONVECTION WILL REMAIN A THREAT OVER CENTRAL
AND SOUTHERN UTAH. GFS INDICATES 0.4 TO 0.6 INCH PW VALUES WILL
SPREAD ACROSS THE ENTIRE FORECAST AREA BY TUESDAY AFTERNOON.

HIGH PRESSURE IS EXPECTED TO BUILD THROUGH MIDWEEK BEFORE IT
STARTS TO SHIFT EAST AHEAD OF A PACIFIC NORTHWEST STORM SYSTEM
MOVING ONSHORE. LATEST ECMWF IS MORE PROGRESSIVE WITH THIS
SYSTEM...SHOWING IT GRAZING NORTHERN UTAH THURSDAY NIGHT/FRIDAY
MORNING...PUSHING A DRY FRONTAL BOUNDARY THROUGH. GFS KEEPS THIS
SYSTEM MOSTLY STATIONARY THROUGH THE LATTER HALF OF THE WEEKEND
BEFORE IT MOVES OVER THE RIDGE INTO MONTANA. BOTH SCENARIOS ALLOW
SOME MOISTURE TO RETURN TO SOUTHEAST UTAH...BUT TEND TO KEEP DRIER
AIR OVER THE REST OF THE STATE. STILL...CHANCE OF PRECIP LOOKS
LIMITED FROM EARLY NEXT WEEK THROUGH DAY 7.

&&

.AVIATION...NORTHERLY WINDS ARE EXPECTED THROUGH AROUND 03-04Z.
SOUTHEAST WINDS EXPECTED THEREAFTER. OCCASIONAL ENHANCEMENT THROUGH
THIS EVENING AS OUTFLOW FROM SHOWERS AND THUNDERSTORMS IS EXPECTED.
CEILINGS ARE EXPECTED TO REMAIN MOSTLY ABOVE BKN080 BUT COULD
TEMPORARILY DIP TO BKN060 IN RAIN SHOWERS THROUGH AT LEAST 02Z AND
POSSIBLY LONGER.

&&

.FIRE WEATHER...A VERY MOIST AIRMASS ACROSS THE REGION WILL SUPPORT
NUMEROUS SHOWERS WITH EMBEDDED THUNDERSTORMS THIS WEEKEND. THIS
ACTIVITY WILL TEND TO LAST THROUGHOUT THE NIGHTTIME PERIOD AS WELL.
THERE IS A GOOD CHANCE OF A WETTING RAINFALL WITH LOCALLY HEAVY
RAINFALL BEING A THREAT. LIGHTNING WILL ALSO BE A THREAT WITH
STRONGER ACTIVITY. HUMIDITY LEVELS WILL BE QUITE HIGH ESPECIALLY
SOUTH...WHILE CLOUD COVER TAKES THE EDGE OFF THE HEAT ACROSS THE
AREA.

A SIGNIFICANT PATTERN SHIFT IS FORECAST NEXT WEEK. THE WEATHER WILL
TREND DRIER AND WARMER DURING THE EARLY PORTION OF THE WEEK WITH
THUNDERSTORMS BECOMING ISOLATED AND MORE ALIGNED ALONG THE HIGHER
TERRAIN. BY MID WEEK...CRITICAL FIRE WEATHER CONDITIONS WILL BECOME
A THREAT AS SOUTHWEST WINDS INCREASE AHEAD OF A LARGE TROUGH
DEVELOPING ACROSS THE WESTERN CONUS. WITH THE INCREASE OF SOUTHWEST
WINDS...HUMIDITY VALUES OF 10-15 PERCENT AND HOT TEMPERATURES WILL
BE COMMON IN THE VALLEYS MID TO LATE WEEK.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR
     UTZ013-016-019>021-518.

WY...NONE.
&&

PUBLIC...TRAPHAGAN
FIRE WEATHER...ROGOWSKI
AVIATION...YOUNG

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
612 AM MDT SAT JUL 27 2013

UTZ001>016-019>021-517-518-WYZ021-281215-
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-
612 AM MDT SAT JUL 27 2013

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

.DAY ONE...TODAY AND TONIGHT

SHOWERS WILL BECOME FAIRLY WIDESPREAD ACROSS THE OUTLOOK AREA
TODAY ALONG WITH SCATTERED THUNDERSTORMS. THESE WILL CONTINUE INTO
TONIGHT MAINLY ACROSS THE SOUTH.

HEAVY RAIN IS POSSIBLE WITH SOME STORMS...ALONG WITH A THREAT OF
FLASH FLOODING. THE BEST CHANCE FOR HEAVY RAIN WOULD BE LATE
TODAY INTO TONIGHT ACROSS THE EASTERN AND SOUTHERN PORTIONS OF THE
AREA.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

SCATTERED SHOWERS AND THUNDERSTORMS WILL PERSIST ON SUNDAY WITH A
CONTINUED THREAT OF LOCAL HEAVY RAIN. THIS WOULD BE MAINLY OVER
CENTRAL AND SOUTHERN PORTIONS DURING THE DAY SPREADING INTO THE
NORTH LATE SUNDAY INTO SUNDAY NIGHT.

DRIER AIR WILL START TO SPREAD IN FROM THE SOUTHWEST ON MONDAY BUT
SHOWERS AND THUNDERSTORMS WILL ONCE AGAIN DEVELOP OVER THE NORTH.
THIS DRYING TREND WILL CONTINUE THROUGH MID WEEK BRINGING MOST OF
THE THUNDERSTORM ACTIVITY TO AN END.

.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

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
622 PM MDT SAT JUL 27 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0610 PM     FLASH FLOOD      CEDAR CITY              37.69N 113.07W
07/27/2013                   IRON               UT   911 CALL CENTER

            NUMEROUS REPORTS OF FLOODED ROADS ACROSS CEDAR CITY.

&&

BARJENBRUCH