Flash Flood Warning 100, NWS Salt Lake City, UT

426 
WGUS75 KSLC 111905
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
105 PM MDT WED SEP 11 2013

UTC021-025-053-112030-
/O.CON.KSLC.FF.W.0100.000000T0000Z-130911T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-IRON UT-KANE UT-
105 PM MDT WED SEP 11 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM MDT FOR WEST
CENTRAL KANE...SOUTH CENTRAL IRON AND EAST CENTRAL WASHINGTON
COUNTIES...

AT 100 PM MDT...ZION NATIONAL PARK HAS RECORDED 1.19 INCHES OF 
PRECIPITATION SINCE 10AM.  HEAVY RAINFALL CONTINUES TO FALL OVER THE 
ENTIRE PARK AS OF 1PM. 

DUE TO THE WIDESPREAD RAINFALL...ZION HAS BEEN HIT WITH MULTIPLE 
FLASH FLOODS OVER THE PAST 24 HOURS WITH ROCKS AND DEBRIS COVERING 
THE MAIN ROAD AT TIMES.

ALL SLOTS AND SMALL STREAMS FLOWING THROUGH THE PARK ARE IN FLOOD 
AND FORECAST TO REMAIN ABOVE DANGEROUS LEVELS THROUGH THE DAY.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO KOLOB CANYON.

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 11325 3751 11306 3744 11300 3740 11289
      3712 11283 3715 11310 3734 11320

$$

MCINERNEY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
552 AM MDT WED SEP 11 2013

.SYNOPSIS...AN UPPER LOW CENTERED OVER SOUTHERN NEVADA WILL MOVE
LITTLE THROUGH TONIGHT THEN LIFT SLOWLY NORTH THURSDAY THROUGH
FRIDAY. THE VERY MOIST AIRMASS THAT ACCOMPANIES THE LOW WILL REMAIN
OVER THE REGION THROUGH FRIDAY THEN SLOWLY DRY FROM THE SOUTHWEST
OVER THE WEEKEND.

&&

.DISCUSSION...THE WEAK BUT EXCEPTIONALLY MOIST CLOSED LOW REMAINS
OVER SRN NV EARLY THIS MORNING JUST SOUTHWEST OF ST GEORGE. BANDS OF
SHOWERS CONTINUE TO SPIN AROUND THE LOW AS SUCCESSIVE VORT LOBES
ROTATE AROUND IT. EACH OF THESE HAS GENERATED HEAVY RAINS AS THEY
HAVE LIFTED THRU SRN AND ERN UT WITH SOME SIGNIFICANT RISES ON AREA
RIVERS AND STREAMS.

THE LOW IS FORECAST TO REMAIN MORE OR LESS STATIONARY TODAY WITH
ADDITIONAL VORT LOBES LIFTING NORTH THRU UT AND EXPECT MORE HEAVY
RAIN OVER AND EAST OF THE MOUNTAIN SPINE. A BAND OF SHOWERS HAS
LIFTED INTO NRN UT AND THESE HAVE SPREAD INTO THE SRN WASATCH FRONT.

RADAR WAS BADLY UNDERESTIMATING THE RAINFALL OVER AND EAST OF THE
MTNS BUT IT SEEMS TO HAVE REVERSED ONCE THE PRECIP MOVED WEST OF THE
MTNS AND APPEARS TO BE OVERESTIMATING THE PRECIP AMOUNTS ACROSS UTAH
COUNTY...LIKELY DUE TO THE EASTERLY FLOW DRYING THE LOWER LEVELS
SOMEWHAT WEST OF THE MTNS. LEFT THE EXISTING FLASH FLOOD WATCH IN
PLACE BUT OPTED TO HOLD OFF ON EXPANDING IT NORTHWARD TO COVER THE
UTAH COUNTY BURN SCARS AS THIS MODEST LOW LEVEL DRYING SHOULD
CONTINUE TODAY AND TONIGHT REDUCING THE POTENTIAL FOR HEAVY RAIN.

THE LOW STARTS TO LIFT N ON THU AND THE EASTERLY FLOW OVER NRN UT
STARTS TO VEER TO MORE SOUTHERLY. THIS SHOULD ALLOW ANY PRECIP TO
BECOME HEAVIER OVER THE NORTHWEST. THE FLOW CONTINUES TO VEER AROUND
THRU FRI AND EXPECT PRECIP TO INCREASE ALONG THE WASATCH FRONT.
MOISTURE SHOULD REMAIN IN PLACE THRU EARLY SAT THEN SLOWLY DRY FROM
THE SOUTHWEST OVER THE WKND.

&&

.AVIATION...A BAND OF LIGHT TO MODERATE RAIN SHOWERS WILL PASS
THROUGH THE KSLC TERMINAL THROUGH 14Z. AT THIS TIME THE PRIMARY
IMPACTS LOOK TO BE BRIEF CIGS AT OR BELOW 6000FT AGL...BUT 30
PERCENT CHANCE EXISTS FOR SOUTHEAST WINDS BECOMING MORE EASTERLY
THROUGH THAT TIME. SIMILAR CONCERNS ARE EXPECTED TO REDEVELOP
AFTER 18Z WITH A 10 PERCENT CHANCE OF THUNDERSTORMS IMPACTING THE
TERMINAL.

SOUTHEASTERLY SURFACE WINDS ARE EXPECTED TO SWITCH TO THE NORTHWEST
PER NORM BETWEEN 18-20Z. THIS SAID...A 40 PERCENT EXISTS THAT
ERRATIC OUTFLOW FROM PASSING SHOWERS WILL PERIODICALLY SWITCH THAT
DIRECTION THROUGH 04Z TONIGHT.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...FLASH FLOOD WATCH THROUGH THIS EVENING FOR
     UTZ010-012>014-016-019>021-517-518.

WY...NONE.
&&

WILENSKY/MERRILL

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
635 AM MDT WED SEP 11 2013

UTZ001>016-019>021-517-518-WYZ021-121200-
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-
635 AM MDT WED SEP 11 2013

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

.DAY ONE...TODAY AND TONIGHT

SHOWERS AND THUNDERSTORMS WILL CONTINUE AT TIMES ACROSS MUCH OF
THE OUTLOOK AREA TODAY THROUGH TONIGHT.

HEAVY RAIN IS LIKELY WITH SOME OF THE STORMS OVER ABOUT THE
SOUTHEASTERN TWO THIRDS OF THE AREA AND THIS WILL CONTINUE TO
GENERATE LOCAL FLASH FLOODING THROUGH THIS EVENING.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS MOST OF THE
OUTLOOK AREA THROUGH THURSDAY ALONG WITH A THREAT OF HEAVY RAIN
AND LOCAL FLASH FLOODING. SHOWERS WILL GRADUALLY TAPER OFF FROM
THE SOUTHWEST FRIDAY THROUGH 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)

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
702 AM MDT WED SEP 11 2013

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

0200 AM     DEBRIS FLOW      7 W HIAWATHA            39.50N 111.16W
09/11/2013                   EMERY              UT   UTILITY COMPANY

            DEBRIS FLOW OUT OF POLE CANYON CROSSED SR 31 IN
            HUNTINGTON CANYON AND CLOSED THE ROAD.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
825 AM MDT WED SEP 11 2013

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

0821 AM     FLOOD            CAPITOL REEF NP         38.28N 111.20W
09/11/2013                   WAYNE              UT   PARK/FOREST SRVC

            HIGHWAY 24 CLOSED DUE TO EROSION FROM FREMONT RIVER JUST
            EAST OF VISITORS CENTER, AND ALSO BETWEEN CAINEVILLE AND
            HANKSVILLE, ALSO HIGHWAY 95 CLOSED DUE TO FLOODING.
            SCENIC DRIVE IN THE PARK HAS BEEN CLOSED FOR DAYS DUE TO
            HIGH WATER. ALL STREAMS/SLOTS RUNNING. ANOTHER 1.86 IN
            PAST 24H ENDING 8AM 9/11

&&

LD