Flash Flood Warning 31, NWS Salt Lake City, UT

137 
WGUS75 KSLC 252125
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
325 PM MDT THU JUL 25 2013

UTC053-252315-
/O.CON.KSLC.FF.W.0031.000000T0000Z-130725T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
325 PM MDT THU JUL 25 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM MDT FOR EAST
CENTRAL WASHINGTON COUNTY...

AT 316 PM MDT...THE THREAT OF FLASH FLOODING CONTINUES IN ZION 
NATIONAL PARK ALONG NORTH CREEK...LITTLE CREEK...AND THE SUBWAY. 
EVEN THOUGH RAINFALL HAS ENDED...INCREASED FLOWS IN THESE DRAINAGES 
STILL PRESENT A POTENTIALLY DANGEROUS SITUATION. ADDITIONAL ISOLATED 
SHOWERS AND THUNDERSTORMS WILL CONTINUE TO MOVE ACROSS SOUTHERN UTAH 
THROUGH THE AFTERNOON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 3737 11307 3737 11299 3725 11307 3727 11313

$$

SCHOENING

723 
WGUS75 KSLC 252312
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
512 PM MDT THU JUL 25 2013

UTC053-252316-
/O.EXP.KSLC.FF.W.0031.000000T0000Z-130725T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
512 PM MDT THU JUL 25 2013

...THE FLASH FLOOD WARNING WILL EXPIRE AT 515 PM MDT FOR EAST CENTRAL
WASHINGTON COUNTY...

THE POTENTIAL FOR FLOODING ACROSS NORTH CREEK...LITTLE CREEK...AND 
THE SUBWAY IN ZION NATIONAL PARK HAS DIMINISHED AS OF 510 PM...AS 
THE AREA HAS NOT EXPERIENCED HEAVY RAINFALL IN THE LAST HOUR OR TWO. 
THEREFORE... THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE. 

HOWEVER...ELEVATED FLOWS WILL STILL BE POSSIBLE OVER THE AREA INTO 
THE EVENING HOURS. MONITOR NOAA WEATHER RADIO OR LOCAL TELEVISION OR 
RADIO FOR THE LATEST WEATHER INFORMATION.

LAT...LON 3737 11307 3737 11299 3725 11307 3727 11313

$$

SCHOENING

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1018 AM MDT THU JUL 25 2013

.SYNOPSIS...DRIER AIR WILL SPREAD INTO THE REGION FROM THE NORTHWEST
TODAY. MOISTURE WILL BEGIN TO RETURN TO THE SOUTHWEST FRIDAY AND
OVERSPREAD THE ENTIRE AREA FOR THE WEEKEND.

&&

.DISCUSSION...MORNING WATER VAPOR IMAGERY AND OBJECTIVE ANALYSIS
SHOW A MID LEVEL RIDGE CENTERED NEAR THE UT/AZ/NV TRIPLE POINT. A
LIGHT NW FLOW ALOFT PREVAILS ACROSS MUCH OF THE FORECAST
AREA...WHICH IS ADVECTING DRIER AIR INTO THE REGION. DESPITE THIS
DRYING TREND...PW VALUES REMAIN IN THE 0.5 TO 0.75 INCH
RANGE PER GOES IMAGERY...WITH LOCALLY HIGHER VALUES OVER THE LOWER
ELEVATIONS OF SOUTHERN UT.

THIS RIDGE IS FORECAST TO AMPLIFY TODAY...BUT LARGELY REMAIN IN
PLACE THROUGH FRIDAY EARLY FRIDAY BEFORE DRIFTING EAST. LINGERING
MOISTURE WILL REMAIN SUFFICIENT TO BRING A THREAT FOR AFTERNOON
AND EVENING SHOWERS AND THUNDERSTORMS TODAY PRIMARILY OVER THE
HIGHER TERRAIN OVER CENTRAL AND SOUTHERN UT...BUT DRIFTING
SOUTHEAST INTO THE ADJACENT LOWER ELEVATIONS AT TIMES.

AS THIS RIDGE SLOWLY SLIDES EAST FRIDAY MOISTURE IS FORECAST TO
BEGIN SPREADING BACK INTO WESTERN UT DURING THE AFTERNOON AND
EVENING HOURS...THEN INCREASE SUBSTANTIALLY SATURDAY AS THE FLOW
ALOFT BECOMES MORE SOUTHWESTERLY...AND A WEAK WAVE LIFTS
NORTHWARD THROUGH THE REGION. THIS INCREASE IN MOISTURE WILL BE
SHORT LIVED HOWEVER...AS A TROUGH IS FORECAST TO DEVELOP ALONG THE
WEST COAST FOR MUCH OF NEXT WEEK...SHUNTING MONSOONAL MOISTURE
SOUTH AND EAST OF THE FORECAST AREA.

&&

.AVIATION...THE SLC TERMINAL WILL SEE VFR CONDITIONS THROUGHOUT THE
DAY WITH SOME SCATTED CLOUDS. SOUTHEAST WINDS ARE EXPECTED TO SHIFT
TO THE NORTHWEST BETWEEN 17Z AND 19Z.

&&

.FIRE WEATHER...HIGH PRESSURE WILL BUILD OVER THE DISTRICT
TODAY...ALLOWING DRIER NORTHWEST FLOW ALOFT TO DEVELOP. LINGERING
LOW LEVEL MOISTURE WILL ALLOW FOR ISOLATED SHOWERS AND THUNDERSTORMS
THIS AFTERNOON...PRIMARILY OVER SOUTHERN UTAH. HOWEVER...WETTING
RAIN POTENTIAL IS LESS THAN IT HAS BEEN IN PREVIOUS DAYS. MOISTURE
WILL RETURN TO SOUTHWEST UTAH TOMORROW BEFORE SPREADING ACROSS THE
ENTIRE DISTRICT OVER THE WEEKEND...INCREASING COVERAGE OF SHOWERS
AND THUNDERSTORMS. DRIER CONDITIONS ARE EXPECTED TO RETURN EARLY
NEXT WEEK.

&&

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

PUBLIC...
FIRE WEATHER...
AVIATION...

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
606 AM MDT THU JUL 25 2013

UTZ001>016-019>021-517-518-WYZ021-261215-
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-
606 AM MDT THU JUL 25 2013

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

.DAY ONE...TODAY AND TONIGHT

DRIER AIR IS SPREADING INTO THE OUTLOOK AREA FROM THE NORTHWEST
TODAY. THERE WILL STILL BE A CHANCE OF SHOWERS AND THUNDERSTORMS
AGAIN THIS AFTERNOON BUT THESE WILL BE MAINLY OVER THE EASTERN
AND SOUTHERN MOUNTAINS. SOME OF THESE WILL DRIFT OFF TOWARDS THE
SOUTHEAST ACROSS THE VALLEYS. ISOLATED HEAVY RAIN IS POSSIBLE FROM
THESE STORMS BUT FOR THE MOST PART THEY SHOULD BE WEAKER AND DRIER
THAN YESTERDAY. ANY SHOWERS THAT DO DEVELOP SHOULD END THIS
EVENING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THE DRYING TREND WILL CONTINUE ACROSS THE NORTHEASTERN OUTLOOK
AREA FRIDAY WITH ONLY A FEW WEAK STORMS POSSIBLE OVER THE
MOUNTAINS. MOISTURE WILL BEGIN TO SPREAD BACK INTO THE
SOUTHWESTERN OUTLOOK AREA FRIDAY AFTERNOON BRINGING A THREAT OF
LOCAL HEAVY RAIN BACK INTO SOUTHWEST UTAH BY LATE IN THE DAY.

MOISTURE WILL SURGE NORTH AGAIN FOR THE WEEKEND OVERSPREADING THE
ENTIRE OUTLOOK AREA BY SATURDAY. THIS WILL BRING SCATTERED
SHOWERS AND THUNDERSTORMS WITH A RENEWED THREAT OF LOCAL HEAVY
RAIN.

ANOTHER AND MORE SIGNIFICANT DRYING TREND IS EXPECTED TO BEGIN
EARLY NEXT WEEK AND CONTINUE THROUGH MID WEEK.

.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