Alert archive / Utah / Flash Flood Warnings in 2012

Flash Flood Warning 16, NWS Salt Lake City, UT

July 16, 2012Kane County, Washington County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 16, 2012, 5:28 PM MDT for Kane County, Washington County, Utah. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 16, 2012, 5:28 PM MDT (23:28 UTC)
Expired
Jul 16, 2012, 11:30 PM MDT
In force
6 hr
Issued by
NWS Salt Lake City, UT
Area
Storm-based polygon
Flood severity
None

Counties Kane County, UT, Washington County, UT

The radar

The Cedar City radar (KICX), 44 km from the middle of the area, began a volume at 23:28 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Las Vegas, NV (KVEF), launched 12:00Z, 11.5 hours before the alert went out and 244 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Las Vegas, NV at 12:00Z on 2012-07-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 610 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 12:00Z on 2012-07-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
610 J/kg
Mixed-layer CIN
-168 J/kg
Mixed-layer LCL
1601 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
96 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

554 
WGUS55 KSLC 162328
FFWSLC
UTC025-053-170530-
/O.NEW.KSLC.FF.W.0016.120716T2328Z-120717T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
528 PM MDT MON JUL 16 2012

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN KANE COUNTY IN UTAH
  EASTERN WASHINGTON COUNTY IN UTAH INCLUDING ZION NATIONAL PARK

* UNTIL 1130 PM MDT

* AT 515 PM MDT...ZION NATIONAL PARK RANGERS AND TRAINED WEATHER
  SPOTTERS REPORTED WIDESPREAD FLASH FLOODING ACROSS NUMEROUS SLOT 
  CANYONS...AND STREAMS WITHIN ZION NATIONAL PARK. THIS INCLUDES LA 
  VERKIN CREEK AND SPRY CANYON...AS WELL AS NUMEROUS SMALL STREAMS 
  WITHIN AND ADJACENT TO THE PARK. ADDITIONAL HEAVY RAINFALL IS 
  EXPECTED INTO THE EVENING HOURS WITH FLASH FLOODING LIKELY 
  CONTINUING. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ZION
  NATIONAL PARK

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 3747 11316 3752 11266 3700 11275 3700 11310
      3703 11310 3704 11316

$$

MPS
2 follow-up statements
648 
WGUS75 KSLC 170135
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
735 PM MDT MON JUL 16 2012

UTC025-053-170530-
/O.CON.KSLC.FF.W.0016.000000T0000Z-120717T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-KANE UT-
735 PM MDT MON JUL 16 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1130 PM MDT FOR 
WESTERN KANE AND EASTERN WASHINGTON COUNTIES INCLUDING ZION NATIONAL 
PARK...

AT 725 PM MDT...FLASH FLOODING CONTINUES ACROSS ZION NATIONAL PARK 
AND ADJACENT AREAS. SIGNIFICANT RISES HAVE BEEN OBSERVED ALONG THE 
NORTH FORK AND EAST FORKS OF THE VIRGIN RIVER. FLASH FLOODING HAS 
ALSO BEEN REPORTED THROUGH NUMEROUS SLOT CANYONS INCLUDING SPRY 
CANYON...AS WELL AS SEVERAL SMALL CREEKS AND STREAMS. LARGE 
WATERFALLS WERE ALSO REPORTED EARLIER THIS AFTERNOON ALONG CANYON 
WALLS FROM THE HEAVY RAIN. 


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 3747 11316 3752 11266 3700 11275 3700 11310
      3703 11310 3704 11316

$$

MPS
446 
WGUS75 KSLC 170526
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1126 PM MDT MON JUL 16 2012

UTC025-053-170534-
/O.EXP.KSLC.FF.W.0016.000000T0000Z-120717T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-KANE UT-
1126 PM MDT MON JUL 16 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1130 PM MDT FOR WESTERN
KANE AND EASTERN WASHINGTON COUNTIES...

RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED GREATLY AND STREAM  
LEVELS IN ZION NATIONAL PARK AND ADJACENT AREAS HAVE DECREASED. 
REPORTS INDICATE THAT FLOODING HAS ENDED. THEREFORE...THE FLASH 
FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE. MONITOR NOAA WEATHER RADIO 
OR LOCAL TELEVISION OR RADIO FOR THE LATEST WEATHER INFORMATION.

LAT...LON 3747 11316 3752 11266 3700 11275 3700 11310
      3703 11310 3704 11316

$$

PW

The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 15, 6:20 PM MDTSevere Thunderstorm WarningSLCEmery55 min
Jul 15, 8:06 PM MDTFlash Flood WarningSLCWashington4 hr
Jul 16, 1:04 PM MDTFlash Flood WarningSLCWayne3 hr
Jul 16, 1:13 PM MDTFlash Flood WarningSLCWashington11 hr
Jul 16, 1:24 PM MDTSpecial Weather StatementSLCTooele66 min
Jul 16, 1:37 PM MDTSevere Thunderstorm WarningSLCKane38 min
Jul 16, 1:49 PM MDTFlash Flood WarningSLCKane, Washington4 hr
Jul 16, 2:00 PM MDTSevere Thunderstorm WarningSLCBox Elder, Tooele43 min
Jul 16, 2:20 PM MDTSpecial Weather StatementSLC70 min
Jul 16, 2:26 PM MDTSpecial Weather StatementSLC49 min
Jul 16, 2:33 PM MDTSevere Thunderstorm WarningSLCKane27 min
Jul 16, 2:55 PM MDTFlash Flood WarningSLCKane3 hr
Jul 16, 3:01 PM MDTSpecial Weather StatementSLC44 min
Jul 16, 3:24 PM MDTSpecial Weather StatementSLCCarbon51 min
Jul 16, 4:10 PM MDTSevere Thunderstorm WarningSLCWashington50 min
Jul 16, 4:38 PM MDTSpecial Weather StatementSLCWeber67 min
Jul 16, 4:49 PM MDTSpecial Weather StatementSLC26 min
Jul 16, 4:54 PM MDTFlash Flood WarningSLCUtah50 min
Jul 16, 4:56 PM MDTSevere Thunderstorm WarningSLCWashington49 min
Jul 16, 5:00 PM MDTSpecial Weather StatementSLCRich60 min
Jul 16, 5:01 PM MDTFlash Flood WarningSLCWashington4 hr
Jul 16, 5:10 PM MDTSevere Thunderstorm WarningSLCSalt Lake, Utah50 min
Jul 16, 5:19 PM MDTSevere Thunderstorm WarningSLCDavis, Salt Lake, Tooele41 min
Jul 16, 5:22 PM MDTSpecial Weather StatementSLCCache38 min
Jul 16, 5:54 PM MDTSpecial Weather StatementSLCDavis, Salt Lake51 min

Nearby

Flash Flood Warnings in Utah, 2012Every flash flood warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.