Flash Flood Warning 25, NWS Salt Lake City, UT

985 
WGUS75 KSLC 210018
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
618 PM MDT SAT JUL 20 2013

UTC053-210100-
/O.CON.KSLC.FF.W.0025.000000T0000Z-130721T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
618 PM MDT SAT JUL 20 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM MDT FOR
CENTRAL WASHINGTON COUNTY...

AT 609 PM MDT...THE THUNDERSTORM PRODUCING FLASH FLOODING OVER THE 
WARNED AREA WAS WEAKENING AND THE HEAVIEST RAINFALL HAS SHIFTED 
SOUTH OF WASHINGTON CITY. 

THIS THUNDERSTORM WILL CONTINUE TO WEAKEN OVER THE NEXT HALF HOUR. 
THE HEAVIEST RAINFALL IS EXPECTED TO STAY TO THE EAST OF ST GEORGE 
CITY. LOCAL MINOR STREET FLOODING IS POSSIBLE NEAR THE ST GEORGE 
AIRPORT AND IN DRY WASHES OVER RURAL AREAS TO THE SOUTH. 

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 3718 11333 3708 11342 3715 11362 3731 11354
      3746 11339 3734 11327

$$

PW

186 
WGUS75 KSLC 210057
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
657 PM MDT SAT JUL 20 2013

UTC053-210101-
/O.EXP.KSLC.FF.W.0025.000000T0000Z-130721T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
657 PM MDT SAT JUL 20 2013

...THE FLASH FLOOD WARNING WILL EXPIRE AT 700 PM MDT FOR CENTRAL
WASHINGTON COUNTY...

PRECIPITATION HAS TAPERED OFF IN THIS AREA AND THE FLASH FLOOD 
WARNING HAS BEEN ALLOWED TO EXPIRE. SOME NORMALLY DRY WASHES COULD 
STILL RUN FOR A WHILE LONGER BUT WATER LEVELS WILL BE LOWERING. 

LOCAL LAW ENFORCEMENT REPORTED WIDESPREAD STREET AND INTERSECTION 
FLOODING IN WASHINGTON CITY AND HURRICANE. WATER AND MUD ACROSS  
I-15 NORTH OF WASHINGTON IMPACTED TRAFFIC FOR A TIME. TREE DAMAGE 
AND DOWNED POWER LINES WERE ALSO REPORTED DUE TO STRONG WINDS WITH 
THE RAIN. 

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 3718 11333 3708 11342 3715 11362 3731 11354
      3746 11339 3734 11327

$$

PW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
353 PM MDT SAT JUL 20 2013

.SYNOPSIS...DRY AIR WILL REMAIN OVER THE NORTHERN TWO-THIRDS OF
THE FORECAST AREA THROUGH MONDAY AS SOUTHERN UTAH REMAINS MOIST.
MOISTURE WILL MOVE BACK NORTHWARD BEGINNING TUESDAY.

&&

.DISCUSSION...THE FORECAST AREA IS STILL UNDER NORTHERLY FLOW
ALOFT ON THE EAST SIDE OF AN UPPER RIDGE. THE DRY AIRMASS OVER
NORTHERN UTAH CONTINUES TO TRICKLE SOUTHWARD...BUT DEEP MOISTURE
REMAINS OVER THE SOUTHERN THIRD OR SO OF THE STATE. WHERE THERE IS
MOISTURE CONVECTION IS DEVELOPING ONCE AGAIN...PRIMARILY OVER THE
HIGHER TERRAIN. STORMS DO NOT APPEAR EXCEPTIONALLY STRONG SO FAR
BUT WILL LIKELY INCREASE IN COVERAGE THROUGH THE EARLY EVENING.
STORM MOTION REMAINS MORE FAVORABLE THAN USUAL FOR DOWNSTREAM
PROPAGATION...RESULTING IN AN ELEVATED THREAT OF FLASH FLOODING
WITH STORMS THAT DO DEVELOP.

IN THE DRIER AIRMASS...TEMPERATURES ARE QUITE WARM ONCE AGAIN.
PARTS OF THE WASATCH FRONT ARE SEEING TEMPERATURES IN EXCESS OF
100F...UP TO 10F ABOVE SEASONAL NORMS. THE VERY WARM TEMPERATURES
WILL CONTINUE INTO EARLY NEXT WEEK...WITH TEMPERATURES PERHAPS
GETTING A FEW DEGREES WARMER AS THE RIDGE CONTINUES TO BUILD. AS
THE RIDGE BUILDS...IT WILL SHIFT EAST EARLY NEXT WEEK. BY
TUESDAY...THE AXIS WILL BE EAST OF THE FORECAST AREA...ALLOWING
SOUTHERLY FLOW TO REDEVELOP. MODELS INDICATE THIS WILL ALLOW THE
DEEP MOISTURE OVER SOUTHERN UTAH TO SPREAD BACK NORTHWARD...FIRST
OVER THE SOUTHWEST ON TUESDAY...AND THEN THROUGH MUCH OF THE REST
OF THE FORECAST AREA WEDNESDAY AND THURSDAY. THE INCREASED
MOISTURE WILL CAUSE SOME SLIGHT COOLING OF MAX TEMPS...PRIMARILY
FOR NORTHERN UTAH. SOME INDICATION THAT CONVECTION WEDNESDAY AND
THURSDAY OVER NORTHERN UTAH COULD BE ENHANCED BY SHORTWAVES MOVING
THROUGH THE RIDGE...BUT IT SEEMS TOO EARLY AT THIS TIME TO PREDICT
THIS WITH MUCH ACCURACY.

EC/GFS INDICATE THAT BY FRIDAY...THE RIDGE WILL FLATTEN...ALLOWING
A MORE WESTERLY FLOW TO DEVELOP ALOFT. THE LATEST EC SOLUTION HAS
MORE OF A NORTHERLY COMPONENT TO THE FLOW THAT BRINGS RAPID DRYING
BY THE WEEKEND. IN THE GFS...THE MOISTENING TREND STOPS...BUT MOST
OF THE MOISTURE STICKS AROUND. HAVE INDICATED A BIT OF A DRYING
TREND IN POPS BY DAY SEVEN...BUT HAVE KEPT AT LEAST ISOLATED
CONVECTION IN FOR THE END OF THE FORECAST PERIOD.

&&

.AVIATION...THE SLC TERMINAL WILL SEE VFR CONDITIONS THROUGHOUT THE
TAF PERIOD WITH MOSTLY CLEAR SKIES. NORTHWEST WINDS ARE EXPECTED TO
SHIFT TO THE SOUTHEAST BETWEEN 03Z AND 04Z.

&&

.FIRE WEATHER...A STRONG RIDGE AXIS FROM NORTHERN CALIFORNIA TO
CENTRAL UTAH WILL REMAIN IN PLACE THROUGH MONDAY BEFORE WEAKENING
AND SHIFTING TOWARDS THE FOUR CORNERS BY TUESDAY. THIS MOVEMENT
WILL ALLOW MOISTURE TO PUSH NORTHWARD DURING THE MID WEEK PERIOD.
IN THE MEANTIME...LITTLE CHANGE IS EXPECTED FROM DAY TO DAY WITH
HOT AND DRY CONDITIONS ACROSS THE NORTH AND SOMEWHAT MOIST
CONDITIONS OVER THE SOUTH. WIDELY SEPARATED SHOWERS AND
THUNDERSTORMS WILL CONTINUE EACH AFTERNOON AND EVENING ACROSS THE
SOUTH WITH BRIEF HEAVY RAINS. MINIMUM HUMIDITY VALUES OF 15-25
PERCENT WILL PREVAIL IN THE SOUTH WHILE SINGLE DIGITS AND TEENS
WILL BE COMMON IN THE NORTH. ALONG WITH WITH THESE LOW RH VALUES
EXPECT MAXIMUM TEMPERATURES TO RUN A GOOD 10 DEGREES ABOVE NORMAL.

&&

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

PUBLIC...TRAPHAGAN
FIRE WEATHER...STRUTHWOLF
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
338 AM MDT SAT JUL 20 2013

UTZ001>016-019>021-517-518-WYZ021-211000-
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-
338 AM MDT SAT JUL 20 2013

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS WILL BRING LOCALIZED HEAVY RAINFALL TO
SOUTHERN UTAH AGAIN THIS AFTERNOON AND EVENING. ISOLATED FLASH
FLOODING IS POSSIBLE...PRIMARILY WITHIN SLOT CANYONS AND NORMALLY
DRY WASHES.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

AFTERNOON AND EVENING THUNDERSTORMS CAN BE EXPECTED ACROSS
SOUTHERN UTAH INTO EARLY NEXT WEEK. LOCALLY HEAVY RAINFALL AND
ISOLATED FLASH FLOODING WILL REMAIN POSSIBLE.

STRENGTHENING HIGH PRESSURE WILL KEEP TEMPERATURES ABOVE NORMAL
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

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
117 PM MDT SAT JUL 20 2013

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

0440 PM     FLASH FLOOD      HILDALE                 37.01N 112.97W
07/19/2013                   WASHINGTON         UT   TRAINED SPOTTER

            TRAINED SPOTTER REPORTED FLOODING UP TO A FOOT DEEP IN
            THE TOWN OF HILDALE.

&&

HOSENFELD