Flash Flood Warning 24, NWS Salt Lake City, UT

000 
WGUS75 KSLC 082109
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
305 PM MDT FRI AUG 8 2008

UTC021-053-082215-
/O.CON.KSLC.FF.W.0024.000000T0000Z-080808T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
IRON UT-WASHINGTON UT-
305 PM MDT FRI AUG 8 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM MDT FOR NORTH
CENTRAL WASHINGTON AND SOUTH CENTRAL IRON COUNTIES...

AT 305 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE VERY HEAVY RAIN FROM SLOW MOVING THUNDERSTORMS OVER THE 
WARNED AREA...INCLUDING NORTH ASH CREEK...LEAP 
CREEK...SOUTH ASH CREEK AND RED BUTTE CANYON AS WELL AS THE TOWN OF 
NEW HARMONY.

DOPPLER RADAR RAINFALL ESTIMATES INDICATE THAT MORE THAN 4 INCHES OF 
RAIN HAS FALLEN JUST WEST OF NEW HARMONY...AND THIS IS EXPECTED TO 
CAUSE SIGNIFICANT RISES IN DOWNSTREAM CREEKS.

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.

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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN SALT 
LAKE CITY.

LAT...LON 3759 11332 3757 11319 3737 11326 3739 11342
TIME...MOT...LOC 2105Z 312DEG 6KT 3738 11327

$$

MT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1041 AM MDT FRI AUG 8 2008

.SYNOPSIS...DEEP SUBTROPICAL MOISTURE WILL REMAIN IN PLACE THROUGH
TODAY AND THEN GRADUAL DRYING WILL OCCUR OVER THE WEEKEND.

&&

.DISCUSSION...A VERY MOIST AIRMASS REMAINS IN PLACE TODAY ACROSS
THE FORECAST AREA FOR YET ANOTHER DAY. THERE IS QUITE A BIT OF
CLOUD COVER ACROSS THE STATE OF UTAH THIS MORNING...BUT IT IS
PRETTY SIMILAR TO WHAT WE HAVE SEEN THE PAST FEW DAYS...SO THESE
CLOUDS ARE EXPECTED TO SCATTER OUT IN MANY AREAS...ALLOWING FOR A
TYPICAL TIMING FOR THE ONSET OF CONVECTION TODAY. BEST CLEARING
CURRENTLY APPEARS TO BE IN THE SOUTHERN AND EASTERN PARTS OF THE
CWA...SO THE FLASH FLOOD WATCH FOR TODAY SEEMS TO BE ON TRACK.
WILL KEEP AN EYE ON THE SOUTHWEST EARLY THIS MORNING TO MAKE SURE
THAT FAR SOUTHWEST UTAH DOES NOT NEED TO BE ADDED TO THE WATCH.
OTHERWISE...CURRENT FORECAST LOOKS GOOD AND NO UPDATES ARE
ANTICIPATED FOR THIS MORNING.

A BREAK FROM THE MOIST AIRMASS STILL APPEARS TO BE ON TRACK
BEGINNING BEGINNING SUNDAY. THE DEEP TROUGH CURRENTLY OFF THE
COAST OF THE PACIFIC NORTHWEST WILL BEGIN TO MOVE INLAND TOMORROW
AND ACROSS MONTANA ON SUNDAY. THIS WILL HELP ADVECT MUCH DRIER AIR
INTO UTAH FROM THE WEST...WHICH IS EXPECTED TO GREATLY REDUCE
CONVECTIVE ACTIVITY BEYOND SUNDAY.

IN THE EXTENDED...THE GFS AND EC DISAGREE ON HOW QUICKLY MOISTURE
WILL RETURN TO THE AREA...WITH THE EC BEING MUCH MORE AGGRESSIVE
IN MOVING MOISTURE UP INTO THE ENTIRE FORECAST AREA TUESDAY
THROUGH THURSDAY. WILL TAKE A LOOK AT MORE RECENT MODEL RUNS AS
THEY COME IN...BUT WILL LIKELY KEEP POPS RELATIVELY LOW UNTIL
MODELS CAN COME UP WITH A BETTER CONSENSUS.

&&

.AVIATION...WINDS AT THE SLC TERMINAL SHOULD REMAIN OUT OF THE SOUTH
THROUGH MOST OF THE MORNING...BUT MAY SHIFT TO THE SOUTHWEST BEHIND
PASSING SHOWERS WITH EMBEDDED THUNDERSTORMS. ANY THUNDERSTORMS THAT
DEVELOP IN THE AREA WILL CAUSE WINDS TO BE GUSTY AND ERRATIC...AND
AS A RESULT THE LAKE BREEZE IS EXPECTED TO BE DELAYED UNTIL 21-23Z.
THERE IS A 40 PERCENT CHANCE THAT CEILINGS WILL BRIEFLY DROP
BETWEEN 5000-6000FT AGL IN THE HEAVIER SHOWERS...BUT VISIBILITIES
SHOULD REMAIN ABOVE 6SM.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...FLASH FLOOD WATCH UNTIL 10 PM FRIDAY FOR UTZ009-UTZ010-UTZ011-
     UTZ012-UTZ013-UTZ020-UTZ021-UTZ517-UTZ518.

WY...NONE.

&&

PUBLIC...SCHOENING
AVIATION...HOSENFELD

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

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
539 AM MDT FRI AUG 8 2008

UTZ001>016-019>021-517-518-WYZ021-091100-
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-
539 AM MDT FRI AUG 8 2008

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

.DAY ONE...TODAY AND TONIGHT

DEEP MOISTURE REMAINS IN PLACE ACROSS THE OUTLOOK AREA TODAY WITH
SHOWERS AND THUNDERSTORMS EXPECTED YET AGAIN. HEAVY RAIN WILL
LIKELY ACCOMPANY SOME OF THE THUNDERSTORMS THAT DEVELOP THIS
AFTERNOON...ESPECIALLY OVER THE MOUNTAINS AND THE EAST. HEAVY
RUNOFF FROM THE LARGER STORMS COULD RESULT IN LOCAL FLASH
FLOODING. FLASH FLOOD PRONE AREAS SUCH AS DRY WASHES AND SLOT
CANYONS SHOULD BE AVOIDED.

SHOWERS AND THUNDERSTORMS WILL GRADUALLY END THIS EVENING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THE AIRMASS ACROSS THE OUTLOOK AREA WILL START TO DRY ON SATURDAY
BUT SUFFICIENT MOISTURE WILL REMAIN FOR ANOTHER DAY OF SHOWERS AND
THUNDERSTORMS. DRYING CONTINUES SUNDAY THROUGH MONDAY WITH LESS
THUNDERSTORM ACTIVITY EACH DAY...BECOMING LIMITED TO ISOLATED
SMALL STORMS OVER THE MOUNTAINS BY MONDAY AFTERNOON. THESE
GENERALLY DRY CONDITIONS WILL 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)