Flash Flood Warning 23, NWS Salt Lake City, UT

445 
WGUS75 KSLC 192157
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
357 PM MDT FRI JUL 19 2013

UTC053-192300-
/O.CON.KSLC.FF.W.0023.000000T0000Z-130719T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
357 PM MDT FRI JUL 19 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 PM MDT FOR 
NORTH CREEK FROM ITS HEADWATERS IN ZION NATIONAL PARK TO ITS 
TERMINUS AT THE VIRGIN RIVER...INCLUDING THE SUBWAY SLOT.

AT 333 PM MDT...NATIONAL SERVICE DOPPLER RADAR ESTIMATES INDICATE 
ALL AREAS IN THE UPPER HEADWATERS OF NORTH CREEK...INCLUDING THOSE 
THAT FEED INTO THE SUBWAY...RECEIVED .35 TO .70 INCHES OF RAIN WITH 
UP TO 1.4 OF RAINFALL IN ROUGHLY 45 MINUTES EARLIER THIS AFTERNOON. 
RAINFALL OF THIS INTENSITY AND SIGNIFICANCE IS EXPECTED TO HAVE 
CREATED FLASH FLOODING IN ZION NATIONAL PARK...SPECIFICALLY THE 
SUBWAY AND OTHER NORTH CREEK TRIBUTARIES.

THE THUNDERSTORM THAT BROUGHT THIS HEAVY RAINFALL HAS SINCE 
DISSIPATED...WITH LOWER PORTIONS OF NORTH CREEK RECEIVING MINIMAL 
RAINFALL. THIS SAID...A FLASH FLOOD REMAINS POSSIBLE OUTSIDE OF PARK 
BOUNDARIES TO THE NORTH CREEK TERMINUS AT THE VIRGIN RIVER. 

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 3735 11318 3737 11303 3729 11299 3726 11308
      3719 11318

$$

MERRILL

548 
WGUS75 KSLC 192253
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
453 PM MDT FRI JUL 19 2013

UTC053-192301-
/O.EXP.KSLC.FF.W.0023.000000T0000Z-130719T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
453 PM MDT FRI JUL 19 2013

...THE FLASH FLOOD WARNING WILL EXPIRE AT 500 PM MDT FOR EAST CENTRAL
WASHINGTON COUNTY...

RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED GREATLY BUT THE 
NORMALLY DRY SLOT CANYONS AND WASHES OF NORTH CREEK WILL LIKELY 
RETAIN FLOWING WATER...ESPECIALLY WITHIN ZION NATIONAL PARK...INTO 
THIS EVENING. REPORTS INDICATE THAT FLOODING HAS ENDED. 
THEREFORE... THE FLASH FLOOD WARNING HAS BEEN 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 3735 11318 3737 11303 3729 11299 3726 11308
      3719 11318

$$

MERRILL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
931 AM MDT FRI JUL 19 2013

.SYNOPSIS...LIGHT NORTHERLY FLOW WILL ALLOW FOR THE DRYING TREND
FROM NORTH TO SOUTH TO CONTINUE THROUGH SATURDAY...WITH MOISTURE
BECOMING INCREASINGLY CONFINED TO FAR SOUTHERN UTAH OVER THE
WEEKEND. HIGH PRESSURE WILL STRENGTHEN OVER NEVADA KEEPING
TEMPERATURES WELL ABOVE NORMAL.

&&

.DISCUSSION...MODELS AND SATELLITE SHOW THE MID LEVEL RIDGE AXIS
HAS SHIFTED WESTWARD INTO NEVADA WHERE IT WILL REMAIN FOR THE NEXT
FEW DAYS. A LIGHT NORTH TO NORTHEAST FLOW ALOFT AROUND THE HIGH
WILL REMAIN ACROSS THE FORECAST AREA. THIS FLOW IS PULLING DRIER
AIR INTO NORTHERN UTAH...WHERE GOES PRECIPITABLE WATER HAS FALLEN
BELOW 0.5 INCHES NORTH OF I-80. COPIOUS MOISTURE REMAINS ACROSS
CENTRAL AND SOUTHERN UTAH.

DRIER AIR WILL CONTINUE TO WORK ITS WAY SOUTHWARD INTO CENTRAL
UTAH TODAY...WHILE MOISTURE REMAINS IN PLACE ACROSS THE SOUTH.
AS A RESULT EXPECT ANOTHER ACTIVE DAY ACROSS THE SOUTH WITH
LOCALLY HEAVY RAINFALL POSSIBLE UNDER WIDELY SCATTERED SHOWERS
AND THUNDERSTORMS. LIKE YESTERDAY...THE NORTHERLY COMPONENT TO THE
FLOW WILL PUSH CONVECTION SOUTHWARD OFF THE HIGHER TERRAIN BY
AFTERNOON. RESULTANT DOWNBASIN PROPAGATION WILL ENHANCE THE
POTENTIAL FOR LOCALIZED FLASH FLOODING OVER SOUTHERN UTAH
ESPECIALLY OVER FLOOD PRONE BASINS. BURN SCARS OVER CENTRAL AND
SOUTHERN UTAH ALSO NEED CLOSE SCRUTINY FOR POTENTIAL HEAVY RAIN.

&&

.AVIATION...THE SLC TERMINAL WILL SEE VFR CONDITIONS THROUGHOUT THE
DAY AND INTO THIS EVENING WITH MOSTLY CLEAR SKIES. SOUTHEAST
WINDS ARE EXPECTED TO SHIFT TO THE NORTHWEST BETWEEN 17Z AND 19Z.
NORMAL RETURN TO SOUTHEAST WINDS EXPECTED BETWEEN 03-04Z.

&&

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

PUBLIC/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...CORRECTED
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
541 AM MDT FRI JUL 19 2013

UTZ001>016-019>021-517-518-WYZ021-201145-
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-
541 AM MDT FRI JUL 19 2013

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

.DAY ONE...TODAY AND TONIGHT

SHOWERS AND THUNDERSTORMS CAPABLE OF PRODUCING LOCALLY HEAVY
RAINFALL CAN BE EXPECTED ACROSS SOUTHERN UTAH THIS AFTERNOON AND
EVENING. ISOLATED FLASH FLOODING WILL BE POSSIBLE...PARTICULARLY
WITHIN SLOT CANYONS...NORMALLY DRY WASHES...AND NEAR RECENT BURN
SCARS.

DRIER AIR SPREADING INTO NORTHERN AND CENTRAL UTAH WILL KEEP THE
THREAT FOR THUNDERSTORMS ISOLATED...AND MAINLY CONFINED TO THE
HIGHER TERRAIN.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

ISOLATED THUNDERSTORMS WILL REMAIN POSSIBLE ACROSS SOUTHERN UTAH
THROUGH THE WEEKEND...HOWEVER THE THREAT FOR HEAVY RAINFALL WILL
BE DIMINISHED AS DRIER AIR SPREADS INTO THE AREA.

STRENGTHENING HIGH PRESSURE WILL KEEP TEMPERATURES ABOVE NORMAL
THROUGH THE WEEKEND AND INTO EARLY NEXT WEEK ACROSS MUCH OF THE
OUTLOOK AREA...WITH TEMPERATURES NEAR OR ABOVE 100 DEGREES IN
MOST VALLEY LOCATIONS.

.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