Flash Flood Warning 55, NWS Salt Lake City, UT

827 
WGUS75 KSLC 310435
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1035 PM MDT SUN AUG 30 2015

UTC025-310645-
/O.CON.KSLC.FF.W.0055.000000T0000Z-150831T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
1035 PM MDT SUN AUG 30 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 AM MDT FOR
SOUTHWESTERN KANE COUNTY...

A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 AM MDT FOR A 
PORTION OF SOUTHWEST KANE COUNTY INCLUDING THE JOHNSON WASH WITHIN 
JOHNSON CANYON. RADAR ESTIMATES INDICATE THAT OVER AN INCH OF RAIN 
FELL OVER A SIZABLE AREA IN THE HEADWATERS OF THE CANYON EARLIER 
THIS EVENING. 
 
ALTHOUGH THE RAIN HAS ENDED OVER THE AREA...HEAVY RUNOFF IS BELIEVED 
TO STILL BE WORKING ITS WAY DOWN THE CANYON. FLASH FLOODING CAN BE 
EXPECTED ALONG JOHNSON WASH THIS EVENING...WHICH WILL IMPACT JOHNSON 
CANYON ROAD AS WELL AS OTHER BACKCOUNTRY ROADS CROSSING JOHNSON 
CANYON. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

&&

LAT...LON 3730 11229 3723 11227 3713 11227 3700 11236
      3700 11239 3714 11245 3726 11249 3730 11241

$$

242 
WGUS75 KSLC 310636
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1236 AM MDT MON AUG 31 2015

UTC025-310645-
/O.EXP.KSLC.FF.W.0055.000000T0000Z-150831T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
1236 AM MDT MON AUG 31 2015

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN KANE COUNTY WILL EXPIRE
AT 1245 AM MDT...

RUNOFF IS DIMINISHING OVER JOHNSON WASH AND SURROUNDING DRAINAGES 
TONIGHT AND THE FLASH FLOOD WARNING FOR THIS AREA WILL BE ALLOWED TO 
EXPIRE. ALTHOUGH THE WARNING HAS ENDED...WATER WILL CONTINUE TO RUN 
HIGH IN THE AREA FOR SEVERAL MORE HOURS...SO CONTINUED CAUTION IS 
URGED. 

LAT...LON 3730 11229 3723 11227 3713 11227 3700 11236
      3700 11239 3714 11245 3726 11249 3730 11241

$$

CRK

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
342 PM MDT SUN AUG 30 2015

.SYNOPSIS...A COLD FRONT OVER EASTERN UTAH WILL WEAKEN THIS
EVENING. WITH THE REGION BETWEEN A RIDGE OF HIGH PRESSURE FROM
THE UPPER MIDWEST TO THE SOUTHERN PLAINS AND A TROUGH OF LOW
PRESSURE OVER THE PACIFIC NORTHWEST...A GENERALLY DRY SOUTHWEST
FLOW WILL PREVAIL FOR MOST OF THE UPCOMING WEEK.

&&

.SHORT TERM...UPPER TROUGH CONTINUES TO MAKE ITS WAY ACROSS IDAHO
AND MONTANA THIS AFTERNOON. THE ASSOCIATED COLD FRONT HAS MOVED
INTO EASTERN UTAH AND SCATTERED SHOWERS AND THUNDERSTORMS HAVE
DEVELOPED ALONG AND AHEAD OF THE BOUNDARY WHERE THE AIRMASS IS
MORE MOIST AND THERE ARE GOOD DYNAMICS. THESE STORMS WILL
CONTINUE INTO THE EARLY EVENING...WITH THE POTENTIAL TO PRODUCE
HEAVY RAIN AND GUSTY WINDS. TEMPERATURES BEHIND THE FRONT ARE
NOTICEABLY COOLER THAN YESTERDAY...WITH MAXES RUNNING IN EXCESS OF
10F BELOW VALUES OBSERVED YESTERDAY OVER NORTHERN UTAH.

AS THE TROUGH MOVES INTO THE CENTRAL UNITED STATES AND THE COLD
FRONT WEAKENS...A DRIER AND MORE STABLE AIRMASS WILL MOVE INTO THE
AREA...RESULTING IN A SLOW WARMING TREND FOR THE EARLY PART OF THE
WEEK. MOISTURE AND INSTABILITY WILL LINGER OVER SOUTHERN UTAH
TOMORROW...ALLOWING FOR SHOWER AND THUNDERSTORM ACTIVITY TO FOCUS
OVER THAT AREA. HOWEVER...CONVECTION SHOULD BE MORE ISOLATED IN
NATURE COMPARED TO TODAY. BY TUESDAY...MOISTURE WILL DECREASE
FURTHER SO ANY LINGERING CONVECTION SHOULD BE CONFINED TO THE
HIGHER TERRAIN. SOUTHWEST WINDS WILL ALSO BEGIN TO INCREASE AS A
PACIFIC NORTHWEST TROUGH SLOWLY MOVES ONSHORE.

&&

.LONG TERM (AFTER 12Z WEDNESDAY)...A PERSISTENT LONG WAVE TROUGH WILL
RESIDE OVER THE PACNW/NORTHERN ROCKIES STATES THROUGH THE LONG TERM
PERIOD. EMBEDDED SHORT WAVE ENERGY WILL GRADUALLY ROTATE AROUND THE
BASE OF THIS MID/LATE WEEK ALLOWING HEIGHTS TO GRADUALLY TREND LOWER
ACROSS THE EASTERN GREAT BASIN AS THIS ENERGY LIFTS NE THROUGH THE
NORTHERN ROCKIES...FURTHER IMPINGING ON THE PLAINS RIDGE AND HOLDING
IT WELL EAST. A DEEP AND DRY SOUTHWESTERLY FLOW WILL PERSIST AS
SUCH.

H7 TEMPS AT KSLC WILL EVER SO SLIGHTLY LOWER DURING THE WED-FRI
TIMEFRAME COINCIDENT WITH THE FALLING HEIGHTS...THOUGH TEMPS WILL
REMAIN NEAR SEASONAL NORMS THROUGH THE END OF THE WORKWEEK. DEEP
MIXING OF FAIRLY STRONG SOUTHWESTERLY FLOW ALOFT WILL AID BREEZY TO
GUSTY CONDITIONS ACROSS MUCH OF THE AREA.

GLOBAL MODELS LARGELY AGREE THAT AMPLIFICATION OF THE EASTERN
PACIFIC RIDGE FRIDAY WILL DRIVE INCREASED AMPLIFICATION OF THE LAST
SHORT WAVE OF THE SERIES...CARVING THE MEAN TROUGH FURTHER
SOUTH/EAST INTO THE NORTHERN GREAT BASIN FRIDAY NIGHT/SATURDAY. THIS
SAID...SOME TIMING/AMPLIFICATION ISSUES BEGIN TO ARISE BETWEEN
EC/GFS AND A FAIR AMOUNT OF SPREAD CONTINUES IN THE GEFS. THIS IS
ESPECIALLY TRUE REGARDING THE ATTENDANT COLD FRONTAL PASSAGE AS IT
WORKS EAST INTO THE FORECAST AREA /LATE FRIDAY GFS...SATURDAY
MORNING EC/. REGARDLESS...GLOBALS DO AGREE THAT FAIRLY STOUT CAA
WILL BE OCCURRING SATURDAY AND HAVE FURTHER LOWERED TEMPS TO WELL
BELOW SEASONAL NORMS NEXT WEEKEND. SAID FRONT DOES APPEAR QUITE
SHALLOW AND MOISTURE STARVED OWING TO A CONTINUATION OF DRY AND
BREEZY CONDITIONS THROUGH DAY 7.

&&

.AVIATION...NORTHERLY WINDS WILL PREVAIL AT KSLC THROUGH THE
REMAINDER OF THE AFTERNOON BEFORE SWITCHING BACK TO THE SOUTH
BETWEEN 02-03Z. THERE IS A 30 PERCENT CHANCE THIS WIND SHIFT IS
DELAYED UNTIL 04Z OR LATER. ISOLATED SHOWERS IN THE VICINITY OF THE
TERMINAL WILL CONTINUE THROUGH THE AFTERNOON...WITH A 20 PERCENT
CHANCE FOR GUSTY ERRATIC OUTFLOW WINDS. VFR CONDITIONS WILL PREVAIL
THROUGH THE PERIOD.

&&

.FIRE WEATHER...SHOWERS AND THUNDERSTORMS HAVE DEVELOPED OVER
EASTERN UTAH ALONG AND AHEAD OF A COLD FRONT MOVING THROUGH THE
DISTRICT. THE CONVECTION WILL TEND TO DISSIPATE THIS EVENING WITH
THE LOSS OF DAYTIME HEATING AND THE WEAKENING OF THE BOUNDARY. A
DRIER AND MORE STABLE AIRMASS WILL MOVE BACK IN FOR THE EARLY PART
OF THE WEEK. WITH ANOTHER TROUGH APPROACHING...SOUTHWEST WINDS
WILL BECOME GUSTY DURING THE MIDDLE TO LATTER PART OF THE WORK
WEEK. THIS MAY PRODUCE AREAS OF CRITICAL FIRE WEATHER CONDITIONS
WHERE FUELS ARE DRY...PARTICULARLY OVER WESTERN UTAH.

&&

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

SHORT TERM/FIRE WEATHER...TRAPHAGAN
LONG TERM...MERRILL
AVIATION...SEAMAN

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
412 AM MDT SUN AUG 30 2015

UTZ001>016-019>021-517-518-WYZ021-311015-
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-
412 AM MDT SUN AUG 30 2015

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

.DAY ONE...TODAY AND TONIGHT

SHOWERS AND THUNDERSTORMS WILL BE SCATTERED OVER THE EASTERN HALF
OF THE FORECAST AREA TODAY INTO THIS EVENING AS A COLD FRONT
SLIDES INTO CENTRAL UTAH. WITH A SOMEWHAT MOIST AIR MASS IN
PLACE...THUNDERSTORMS MAY PRODUCE BRIEF HEAVY THIS AFTERNOON AND
EVENING...PRIMARILY OVER THE SOUTHERN AND EASTERN SECTIONS OF THE
FORECAST AREA.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

GUSTY SOUTHWEST WINDS AND A RATHER DRY AIR MASS MAY PRODUCE
CRITICAL FIRE WEATHER CONDITIONS FROM TUESDAY THROUGH
FRIDAY...PARTICULARLY ACROSS WESTERN UTAH.

.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 ROAD TRAVEL IMPACTS VISIT...
HTTP://WWW.UDOTTRAFFIC.UTAH.GOV/ROADWEATHERFORECAST.ASPX