Flash Flood Warning 45, NWS Salt Lake City, UT

117 
WGUS75 KSLC 090211
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
811 PM MDT MON SEP 8 2014

UTC021-053-090221-
/O.CAN.KSLC.FF.W.0045.000000T0000Z-140909T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-IRON UT-
811 PM MDT MON SEP 8 2014

...THE FLASH FLOOD WARNING FOR CENTRAL WASHINGTON AND SOUTHWESTERN
IRON COUNTIES IS CANCELLED...

THE HEAVY RAIN OVER MOST OF WASHINGTON COUNTY HAS ENDED...AND 
FLOODING IS NO LONGER EXPECTED TO POSE A THREAT. PLEASE CONTINUE TO 
HEED ALL ROAD CLOSURES.

LAT...LON 3745 11327 3715 11334 3709 11377 3727 11376
      3741 11359 3753 11347 3752 11334

$$

MCINERNEY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
335 PM MDT MON SEP 8 2014

.SYNOPSIS...TROPICAL MOISTURE WILL REMAIN OVER THE AREA THROUGH
TOMORROW. A DRIER NORTHWEST FLOW WILL DEVELOP FOR MIDWEEK AS HIGH
PRESSURE REBUILDS OVER THE REGION.

&&

.DISCUSSION...DEEP TROPICAL MOISTURE HAS MOVED OVER THE FORECAST
AREA THIS AFTERNOON. SATELLITE DERIVED PWS SHOW VALUES RANGING
FROM 1.0 INCH OVER NORTHERN UTAH TO UP TO 1.5 INCHES NEAR THE
UT/AZ BORDER...WELL IN EXCESS OF THREE STANDARD DEVIATIONS ABOVE
NORMAL FOR THIS TIME OF YEAR. A PACIFIC STORM SYSTEM IS PUSHING
INTO NEVADA AND WILL MOVE ACROSS UTAH THIS EVENING AND OVERNIGHT.

AHEAD OF THE WAVE...NUMEROUS SHOWERS AND THUNDERSTORMS HAVE
DEVELOPED OVER THE WESTERN HALF OF THE STATE...WITH MORE SCATTERED
CONVECTION ELSEWHERE. HEAVY RAIN HAS BEEN REPORTED WITH THESE
CELLS...WHICH HAVE ALREADY PRODUCED WIDESPREAD FLASH FLOODING AT
ZION NATIONAL PARK. AS THE WAVE MOVES ACROSS THE
STATE...PRECIPITATION IS EXPECTED TO BECOME MORE WIDESPREAD BUT
MAY BE MORE STRATIFORM IN NATURE. STILL...THE THREAT OF HEAVY RAIN
CONTINUES OVERNIGHT AND INTO TUESDAY. GOING FLASH FLOOD WATCH OVER CENTRAL
AND SOUTHERN UTAH COVERS THE THREAT WELL.

AS THE TROUGH PASSES...THE FLOW WILL FLIP TO A W/NW DIRECTION
BEHIND IT...BRINGING IN DRIER AND MORE STABLE AIR FOR THE MIDDLE
PART OF THE WEEK. HIGH PRESSURE WILL CONTINUE TO BUILD INTO THE
UPCOMING WEEKEND. WARMING TREND WILL BE SLOW...BUT MAXES ARE
EXPECTED TO APPROACH CLIMO BY THE WEEKEND. SOME INDICATION THAT A
BIT OF MOISTURE WILL RETURN TO THE SOUTH OVER THE WEEKEND AS THE
FLOW FINALLY GOES BACK TO S/SWLY...BUT HARD TO SAY AT THIS TIME.

&&

.AVIATION...WINDS AT THE SLC TERMINAL ARE EXPECTED TO PREVAIL OUT OF
THE SOUTH THROUGH TONIGHT. HOWEVER...WINDS WILL BECOME OCCASIONALLY
ERRATIC AND GUSTY AS THUNDERSTORMS MOVE THROUGH THE SURROUNDING AREA
THROUGH THIS EVENING. THERE IS A 50 PERCENT CHANCE OF THUNDERSTORMS
AT THE TERMINAL BETWEEN 22Z AND 01Z AND BRIEF MVFR CONDITIONS MAY BE
POSSIBLE. THERE IS A GREATER CHANCE OF RAIN WITH CIGS BELOW 7KFT
AFTER 03Z TONIGHT AND CONTINUING INTO TUESDAY MORNING...BUT ONLY A
20 PERCENT CHANCE OF THUNDERSTORMS.

&&

.FIRE WEATHER...MOISTURE WILL REMAIN ACROSS THE AREA THROUGH TONIGHT
AND EARLY TUESDAY AND THEN START TO DRY FROM NORTHWEST TO SOUTHEAST
DURING THE COURSE OF THE DAY. MANY AREAS SOUTH OF I-80 WILL RECEIVE
0.50 TO 1.00 INCH OF RAIN WITH LOCALLY UP TO 3 INCHES ARE POSSIBLE.
A DRY NORTHWEST FLOW WILL THEN PREVAIL WEDNESDAY THROUGH SATURDAY.
RELATIVE HUMIDITY VALUES WILL LOWER INTO THE UPPER TEENS OVER THE
NORTHWEST DESERT BY THURSDAY AND THEN OTHER VALLEYS FRIDAY THROUGH
SATURDAY.

&&

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

WY...NONE.
&&

PUBLIC...TRAPHAGAN
FIRE WEATHER...STRUTHWOLF
AVIATION...CHENG

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
340 PM MDT MON SEP 8 2014

UTZ001>016-019>021-517-518-WYZ021-090945-
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-
340 PM MDT MON SEP 8 2014

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

ABUNDANT MOISTURE WILL BRING A THREAT FOR HEAVY RAINFALL AND
FLASH FLOODING TO CENTRAL AND SOUTHERN UTAH TONIGHT...AND
CONTINUING INTO TUESDAY. THE FLASH FLOOD RISK WILL BE GREATEST
WITHIN SLOT CANYONS AND SLICKROCK AREAS...NORMALLY DRY
WASHES...AND NEAR RECENT BURN SCARS. URBAN AREAS MAY EXPERIENCE
DRAINAGE PROBLEMS RESULTING FROM HEAVY RAINFALL...AND TRAVEL ON
BACKCOUNTRY ROADS WILL BECOME DIFFICULT. SIGNIFICANT RISES ARE
ALSO LIKELY ALONG THE LARGER RIVERS AND STREAMS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THE POTENTIAL FOR HEAVY RAINFALL AND FLASH FLOODING WILL CONTINUE
INTO THE DAY TUESDAY ACROSS CENTRAL AND SOUTHERN UTAH. DRIER AIR
WILL WORK INTO THE REGION LATE IN THE DAY TUESDAY BRINGING AN END
TO THE HEAVY RAIN THREAT BY TUESDAY NIGHT.

.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 ROAD TRAVEL IMPACTS VISIT...
HTTP://WWW.UDOTTRAFFIC.UTAH.GOV/ROADWEATHERFORECAST.ASPX

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
244 PM MDT MON SEP 08 2014

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

0243 PM     FLASH FLOOD      20 N ESCALANTE          38.05N 111.60W
09/08/2014                   GARFIELD           UT   PARK/FOREST SRVC

            HARRIS WASH FLASH FLOODED ON FRIDAY...SEPTEMBER 5TH.
            PEOPLE STRANDED WITH ROADS WASHED OUT NEAR HOLE IN THE
            ROCK ROAD.

&&

BMCINERN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
304 PM MDT MON SEP 08 2014

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

0243 PM     FLASH FLOOD      4 NW SPRINGDALE         37.22N 113.05W
09/08/2014                   WASHINGTON         UT   PARK/FOREST SRVC

            FLASH FLOODING IN ZION NATIONAL PARK. MULTIPLE DRAINAGES
            IN THE PARK FLASH FLOODING WITH WATERFALLS OVER MOST OF
            THE WESTERN END.

&&

BMCINERN

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
455 PM MDT MON SEP 8 2014

UTZ002-003-006-007-009-082330-
WASATCH MOUNTAIN VALLEYS UT-SALT LAKE AND TOOELE VALLEYS UT-
WESTERN UINTA MOUNTAINS UT-NORTHERN WASATCH FRONT UT-
WASATCH MOUNTAINS I-80 NORTH UT-
455 PM MDT MON SEP 8 2014

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN SUMMIT...NORTHEASTERN
SALT LAKE...MORGAN...CENTRAL WEBER AND EASTERN DAVIS COUNTIES UNTIL
530 PM MDT...

AT 452 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN
AREA OF STRONG THUNDERSTORMS BETWEEN WOODS CROSS AND FARR WEST
MOVING TO THE NORTHEAST AT AROUND 30 MPH.

WINDS IN EXCESS OF 40 MPH HAVE BEEN OBSERVED IN ASSOCIATION WITH
THESE STORMS. HEAVY RAIN WILL ALSO PRODUCE AREAS OF URBAN FLOODING.

LOCATIONS IMPACTED INCLUDE...
SALT LAKE CITY...OGDEN...LAYTON...BOUNTIFUL...FARMINGTON...MORGAN...
ROY...CLEARFIELD...KAYSVILLE...SYRACUSE...CLINTON...SOUTH OGDEN...
NORTH SALT LAKE...CENTERVILLE...WOODS CROSS...WASHINGTON TERRACE...
RIVERDALE...HOOPER...SOUTH WEBER AND WEST BOUNTIFUL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF THREATENING WEATHER APPROACHES...TAKE SHELTER IN A STURDY
BUILDING.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

STRONG WINDS WITH THESE STORMS MAY OCCUR WELL AHEAD OF ANY RAIN OR
LIGHTNING. DO NOT WAIT FOR THE SOUND OF THUNDER BEFORE TAKING COVER.
SEEK SHELTER IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

&&

LAT...LON 4071 11186 4115 11223 4133 11167 4099 11135
TIME...MOT...LOC 2252Z 240DEG 49KT 4093 11190

MT