Flash Flood Warning 23, NWS Salt Lake City, UT

466 
WGUS75 KSLC 022235
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
435 PM MDT MON AUG 2 2010

UTC013-022244-
/O.CAN.KSLC.FF.W.0023.000000T0000Z-100802T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DUCHESNE UT-
435 PM MDT MON AUG 2 2010

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WEST CENTRAL
DUCHESNE COUNTY...

RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED GREATLY AND RIVER 
AND STREAM LEVELS HAVE DECREASED. THEREFORE...THE FLASH FLOOD 
WARNING HAS BEEN CANCELLED. 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 4013 11079 4014 11068 4000 11075 4001 11084

$$

HOSENFELD

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1030 AM MDT MON AUG 2 2010

.SYNOPSIS...THE UPPER RIDGE CENTERED ACROSS THE SOUTHERN PLAINS
WILL MAINTAIN A VERY MOIST AIRMASS ACROSS SOUTHERN AND EASTERN
UTAH EARLY THIS WEEK. DRIER AIR WILL FILTER INTO NORTHERN AND
WESTERN UTAH THROUGH TUESDAY. THE UPPER RIDGE WILL MOVE WEST TO
THE SOUTHERN ROCKIES MIDWEEK...BRINGING DEEP LAYER MOISTURE BACK
NORTH THROUGH THE ENTIRE FORECAST AREA LATE IN THE WEEK.

&&

.DISCUSSION...PRIMARY FORECAST CONCERN TODAY IS AGAIN THE POTENTIAL
FOR FLASH FLOODING.

WATER VAPOR LOOP SHOWS A WEAK UPPER LEVEL DISTURBANCE NEAR THE FOUR
CORNERS.  A TROUGH OF LOW PRESSURE WAS OVER THE PACIFIC NORTHWEST.
A VERY MOIST AIRMASS REMAINS IN PLACE OVER MUCH OF FORECAST AREA...
WITH MORNING UPPER AIR SOUNDINGS INDICATING PRECIPITABLE WATER
VALUES RANGING FROM AROUND AN INCH AT SALT LAKE CITY TO NEAR AN INCH
AND A HALF OVER THE SOUTHEAST SECTIONS OF FORECAST AREA.  WATER
VAPOR IMAGERY INDICATES DRIER AIR ADVECTING INTO NORTHWEST UTAH.

GIVEN PLACEMENT OF UPPER DISTURBANCE AND DEEPEST MOISTURE...
SOUTHEAST SECTIONS OF FORECAST AREA ARE OF GREATEST CONCERN.
AIRMASS WILL BE RATHER UNSTABLE THIS AFTERNOON...WITH MODELS
INDICATING CAPES OF 500 J/KG AND LI VALUES OF MINUS 4 ACROSS EAST
CENTRAL AND SOUTHEAST UTAH.  BASED ON RICH MOISTURE IN PLACE ACROSS
SOUTHEAST UTAH...AND STORM MOTION OF ONLY AROUND 5 KNOTS...FLOOD
WATCH THIS AFTERNOON AND EVENING ACROSS EAST CENTRAL AND SOUTHEAST
SECTIONS OF FORECAST AREA LOOKS GOOD.

&&

.AVIATION...THE SLC TERMINAL WILL SEE VFR CONDITIONS THROUGHOUT THE
DAY. SOUTHEAST WINDS ARE EXPECTED TO SHIFT TO THE NORTHWEST BETWEEN
17Z AND 19Z. THERE IS A 20 PERCENT CHANCE FOR A PERIOD OF
THUNDERSTORM INDUCED GUSTY AND ERRATIC WINDS SOMETIME BETWEEN 21Z
AND 02Z.

&&

.FIRE WEATHER...DEEP MOISTURE WILL REMAIN OVER CENTRAL...EASTERN AND
SOUTHERN PORTIONS OF THE FIRE DISTRICT THROUGH MIDWEEK. MEANWHILE
SOME DRYING THAT BEGAN ACROSS NORTHWESTERN PORTIONS SUNDAY WILL
CONTINUE TO SPREAD EAST ACROSS THE EXTREME NORTH AND SOUTH OVER THE
WEST CENTRAL VALLEYS TODAY. BY THURSDAY AND FRIDAY AN APPROACHING
TROUGH WILL TURN THE FLOW MORE SOUTHERLY AND MOISTURE WILL ONCE
AGAIN SPREAD NORTHWARD. THIS MOISTURE WILL ALLOW FOR ISOLATED
SHOWERS AND THUNDERSTORMS IN THE NORTH AND SCATTERED SHOWERS AND
THUNDERSTORMS OVER THE SOUTH. DUE TO THE HIGH AMOUNT OF
MOISTURE...WETTING RAIN IS LIKELY WITH ANY STORMS THAT DEVELOP OVER
CENTRAL AND SOUTHERN PORTIONS THROUGH FRIDAY. A DRIER AIRMASS IS
EXPECTED OVER THE REGION NEXT WEEKEND.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...FLASH FLOOD WATCH FROM NOON THROUGH 10 PM MDT THIS EVENING
     FOR UTZ012-013-020-021.
WY...NONE.

&&

PUBLIC...BARJENBRUCH
FIRE WEATHER...TRAPHAGAN
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
316 AM MDT MON AUG 2 2010

UTZ001>016-019>021-517-518-WYZ021-031200-
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-
316 AM MDT MON AUG 2 2010

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

.DAY ONE...TODAY AND TONIGHT

A VERY MOIST AIRMASS WILL REMAIN IN PLACE ACROSS EAST CENTRAL AND
SOUTHEAST UTAH TODAY AND TONIGHT. SCATTERED THUNDERSTORMS ARE
EXPECTED TO DEVELOP ACROSS THIS AREA TODAY. THESE STORMS WILL BE
SLOW MOVING AND CAPABLE OF PRODUCING VERY HEAVY WHICH MAY RESULT
IN FLASH FLOODING. SLOT CANYONS...SMALL STREAMS..AND NORMALLY DRY
WASHES MAY BE PARTICULARLY HAZARDOUS LOCATIONS TODAY. STORMS WILL
BE MORE ISOLATED ACROSS WESTERN AND NORTHERN UTAH. HOWEVER...SOME
OF THESE STORMS COULD PRODUCE WIND GUSTS IN EXCESS OF 50 MPH AND
SMALL HAIL.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SUNDAY

SOMEWHAT DRIER AIR WILL REMAIN IN PLACE ACROSS FAR WESTERN AND
NORTHERN UTAH TOMORROW ALTHOUGH ISOLATED THUNDERSTORMS ARE STILL
EXPECTED. DEEPER MOISTURE WILL REMAIN IN PLACE ACROSS THE EAST
CENTRAL AND SOUTHEAST PORTION OF THE STATE WITH SCATTERED
THUNDERSTORMS EXPECTED DURING THE AFTERNOON AND EVENING EACH DAY.
SOME OF THESE STORMS WILL BE CAPABLE OF PRODUCING LOCALLY HEAVY
RAIN.

MOISTURE IS FORECAST TO SPREAD NORTH ACROSS THE STATE WEDNESDAY
INTO THURSDAY NIGHT...INCREASING THE THREAT FOR HEAVY RAINFALL
ACROSS THE REGION.

A DRIER AIRMASS IS EXPECTED FRIDAY THROUGH NEXT WEEKEND.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

ROGOWSKI

FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)