Flash Flood Warning 47, NWS Salt Lake City, UT

000 
WGUS75 KSLC 061917
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
115 PM MDT FRI OCT 6 2006

UTC017-025-055-062030-
GARFIELD UT-WAYNE UT-KANE UT-
115 PM MDT FRI OCT 6 2006

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM MDT FOR
KANE...WAYNE AND GARFIELD COUNTIES...

FLASH FLOODING CONTINUES IN THE WARN AREA WITH MULTIPLE 
WASHES...SLOT CANYONS...AND MAINSTEM RIVERS IN ACTIVE FLOOD.  

THE FREMONT RIVER IN CAPITOL REEF NATIONAL PARK IS CURRENTLY ERODING 
SR 24 THROUGH THE PARK...WHICH IS NOW DOWN TO ONE LANE.  THE ROAD IS 
ALSO BEING DAMAGED DOWNSTREAM NEAR THE TOWN OF CAINVILLE.  THE 
FREMONT RIVER IS FLOWING AT 3613 CFS AND IS ANTICIPATED TO INCREASE. 
THE RIVER WAS FLOWING AT 39 CFS PRIOR TO THE STORM. THE DIRTY DEVIL 
RIVER IS FLOWING AT 13955 CFS...AND WAS FLOWING AT 72 CFS PRIOR TO 
THE EVENT.  

IT IS ANTICIPATED THAT SEVERE FLOODING IS OCCURRING IN ALL SLOT 
CANYONS...DRY WASHES...AND SMALLER RIVERS IN THE WARN AREA.

RAINFALL IN THE AREA WILL DECREASE THROUGH EARLY AFTERNOON...AND 
THEN INCREASE LATER THIS EVENING.  THIS STORM SYSTEM IS EXPECTED TO 
CONTINUE THROUGH THE EARLY SATURDAY MORNING.

PLEASE USE EXTREME CAUTION WHEN TRAVELING NEAR THESE DANGEROUS 
WATERWAYS. DO NOT DRIVE THROUGH ANY WATER COVERED ROADWAYS AND BE 
VIGILANT TO RAPIDLY CHANGING ROAD CONDITIONS.

LAT...LON 3702 11255 3701 11137 3716 11100 3846 11014 3841 11145 
3811 11199

$$

MCINERNEY/SMITH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
525 AM MDT FRI OCT 6 2006

.SYNOPSIS...A LOW PRESSURE SYSTEM OVER SOUTHERN CALIFORNIA WILL LIFT
NORTHEAST THROUGH THE GREAT BASIN THIS AFTERNOON THROUGH EARLY
SATURDAY.

&&

.DISCUSSION...DEEP LAYER MOISTURE PLUME ACROSS THE GREAT BASIN WILL
SERVE AS THE FUEL FOR A RATHER ACTIVE PERIOD OF CONVECTIVE PRECIP
OVER THE NEXT 12-24 HOURS. THE UPPER LOW CURRENTLY ALONG THE SRN CA
COAST WILL LIFT NE INTO THIS MOISTURE LATER THIS AFTERNOON. STRONG
DYNAMIC LIFT WORKING ON THIS MOIST/UNSTABLE AIRMASS SHOULD GENERATE
WIDESPREAD AND OFTEN HEAVY PRECIP. GOOD 700-400MB SHEAR LATE THIS
AFTERNOON COULD LEAD TO SOME SEVERE THUNDERSTORM DEVELOP DURING THE
LATE AFTERNOON AND EVENING HOURS...PRIMARILY OVER THE WRN HALF OF
THE STATE.

THE HANG-BACK LOW THAT DEVELOPS IN THE WAKE OF THE COASTAL CA LOW
WILL SETTLE OVER SRN CA/WRN AZ LATE IN THE WEEKEND. THE LATEST GFS
MODEL PHASES THIS LOW WITH A SHORTWAVE DIGGING SOUTH ALONG THE CONT
DIVIDE EARLY NEXT WEEK...FORMING A NEW CLOSED LOW OVER THE BASIN
FOR THE MIDDLE OF THE WEEK. THIS LOW SHOULD FIND PLENTY OF MOISTURE
REMAINING FROM THE FIRST STORM...SO WILL BUMP POPS UP DURING THE
TUESDAY/EARLY WEDNESDAY PORTION OF THE EXTENDED. HIGH PRESSURE
ALOFT SHOULD BUILD BACK INTO THE REGION LATE IN THE WEEK...BRINGING
AN END TO ANY PRECIP THREAT.

&&

.HYDROLOGY...DEEP LAYER MOISTURE OVER ALL OF THE FORECAST AREA
FUELING WIDESPREAD...AND AT TIMES HEAVY RAINFALL...OVERNIGHT.
CONCERN TODAY WILL BE THE CONTINUATION OF THE HEAVY RAIN THREAT AS
THE SRN CA UPPER LOW LIFTS NE INTO UTAH.  STRONG DYNAMIC LIFT
WORKING ON THE MOIST/UNSTABLE AIRMASS OVER THE AREA WILL PRODUCE
HEAVY RAINFALL. FLASH FLOODING A GOOD BET OVER SRN/ERN UTAH THROUGH
THIS EVENING DUE TO INTENSE CONVECTIVE PRECIP AND ALREADY SATURATED
GROUNDS. HAVE EXTENDED THE FLASH FLOOD WATCH INTO MIDEVENING AS THE
UPPER LOW ONLY EXPECTED TO REACH EXTREME SW UT AROUND 00Z.

&&

.AVIATION...ALTHOUGH INTERMITTENT SHOWERS AND THUNDERSTORMS WILL
AFFECT THE SLC TERMINAL THROUGH EARLY AFTERNOON WITH MORE WIDESPREAD
STORMS LATER THIS AFTERNOON THE MAIN WEATHER CONCERN WILL BE THE
POSSIBILITY OF SEVERE THUNDERSTORMS THIS EVENING. LARGE HAIL AND
DAMAGING WINDS WILL BE THE MAIN THREAT. IN THE MEANTIME...THERE IS
LESS THAN A 30 PERCENT CHANCE OF CEILINGS BELOW 7000 FT AGL THROUGH
MID AFTERNOON. THERE IS A 40 PERCENT CHANCE OF MVFR VISIBILITIES IN
HEAVY RAIN THIS EVENING.

&&

.FIRE WEATHER...COPIOUS AMOUNTS OF RAIN WILL CONTINUE TO AFFECT
EASTERN PORTIONS OF THE FIRE DISTRICT TODAY UNDER THE MOIST SUB
TROPICAL FLOW ALOFT. AS THE STORM SYSTEM OVER CALIFORNIA FINALLY
EJECTS NORTHEAST ACROSS NEVADA THIS MOIST FLOW WILL PRODUCE WETTING
RAINS ACROSS WESTERN AND NORTHERN PORTIONS LATE TODAY AND THIS
EVENING. RAIN AMOUNTS OF 0.50 TO 1.00 INCH WILL BE COMMON ACROSS THE
DISTRICT WITH LOCAL 3 INCH AMOUNTS POSSIBLE IN THE MOUNTAINS AND OVER
SOUTHEAST UTAH BY SATURDAY MORNING.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...FLASH FLOOD WATCH UNTIL 9 PM FRIDAY FOR UTZ010-012-013-017<021.
WY...NONE.

&&

PUBLIC...CONGER
AVIATION/FIRE WX...STRUTHWOLF

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
700 AM MDT FRI OCT 6 2006

UTZ010>021-071300-
CASTLE COUNTRY-CENTRAL AND SOUTHWEST MOUNTAINS-GLEN CANYON RECREATION
AREA/LAKE POWELL-HENRY MOUNTAINS-SAN RAFAEL SWELL-SANPETE/SEVIER
VALLEYS-SOUTH CENTRAL UTAH-SOUTHWEST UTAH-UTAHS DIXIE AND ZION
NATIONAL PARK-WASATCH PLATEAU/BOOK CLIFFS-WEST CENTRAL UTAH-WESTERN
UINTA BASIN-
700 AM MDT FRI OCT 6 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE SOUTHERN TWO-THIRDS OF
UTAH.

.DAY ONE...TODAY AND TONIGHT

A VERY MOIST AND UNSTABLE AIRMASS OVER UTAH WILL FUEL NUMEROUS
SHOWERS AND THUNDERSTORMS TODAY...AND ON INTO THIS EVENING. A LOW
PRESSURE SYSTEM MOVING NORTHEAST INTO SOUTHERN UTAH LATER THIS
AFTERNOON WILL PRODUCE STRONG THUNDERSTORMS...WITH HEAVY RAIN AND
HAIL...DURING THE LATE AFTERNOON AND EVENING HOURS. THE EXPECTED
HEAVY RAINFALL COULD CREATE FLASH FLOODING...ESPECIALLY IN SLOT
CANYONS OR IN AREAS THAT HAVE ALREADY RECEIVED HEAVY RAIN SINCE
YESTERDAY. A FLASH FLOOD WATCH IS IN EFFECT FOR MUCH OF SOUTHERN AND
EASTERN UTAH THROUGH 900 PM MDT THIS EVENING. CHECK THE LATEST
SLCFFASLC FOR DETAILS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SATURDAY WILL SEE DRIER CONDITIONS SPREAD ACROSS SOUTHERN UTAH. THE
THREAT OF SHOWERS AND THUNDERSTORMS WILL RETURN SUNDAY...AND
CONTINUE INTO THE MIDDLE OF NEXT WEEK. HIGH PRESSURE ALOFT WILL
BRING AN END TO SHOWERS AND STORMS BY THE END OF THE WEEK.

.SPOTTER INFORMATION STATEMENT...

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

UTZ001>009-WYZ021-071300-
CACHE VALLEY/UTAH PORTION-GREAT SALT LAKE DESERT AND MOUNTAINS-
NORTHERN WASATCH FRONT-SALT LAKE AND TOOELE VALLEYS-
SOUTHERN WASATCH FRONT-SOUTHWEST WYOMING-WASATCH MOUNTAIN VALLEYS-
WASATCH MOUNTAINS I-80 NORTH-WASATCH MOUNTAINS SOUTH OF I-80-
WESTERN UINTA MOUNTAINS-
700 AM MDT FRI OCT 6 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN UTAH AND EXTREME
SOUTHWEST WYOMING.

.DAY ONE...TODAY AND TONIGHT

WIDESPREAD SHOWER AND THUNDERSTORM ACTIVITY IS EXPECTED ACROSS THE
AREA TODAY. HEAVY RAINS AND HAIL FROM STRONG THUNDERSTORMS ARE
EXPECTED LATER THIS EVENING AS A LOW PRESSURE SYSTEM LIFTS NORTHEAST
ACROSS NORTHERN UTAH. MINOR FLOODING COULD DEVELOP FROM THE STRONG
STORMS...ESPECIALLY IN THE URBAN AREAS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SHOWERS AND THUNDERSTORMS WILL LINGERING INTO SATURDAY...THEN END
MOST AREAS SATURDAY NIGHT OR EARLY SUNDAY. SHOWERS AND STORMS COULD
RETURN FOR THE FIRST HALF OF NEXT WEEK AS A NEW LOW PRESSURE SYSTEM
SETTLES INTO THE GREAT BASIN. HIGH PRESSURE ALOFT WILL RETURN LATE IN
THE WEEK...BRINGING AN END TO THE PRECIPITATION FOR NORTHERN UTAH
AND SOUTHWEST WYOMING.

.SPOTTER INFORMATION STATEMENT...

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