Alert archive / Utah / Flash Flood Warnings in 2012

Flash Flood Warning 18, NWS Salt Lake City, UT

July 16, 2012Kane County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 16, 2012, 7:15 PM MDT for Kane County, Utah. It was in force for 5 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, 7:15 PM MDT (01:15 UTC)
Expired
Jul 17, 2012, 12:35 AM MDT
In force
5 hr
Issued by
NWS Salt Lake City, UT
Area
Storm-based polygon
Flood severity
None

County Kane County, UT

The radar

The Cedar City radar (KICX), 130 km from the middle of the area, began a volume at 01:16 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

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 1.3 hours before the alert went out and 234 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, Flgstf/Belemont, AZ at 00:00Z on 2012-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 00:00Z on 2012-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2251 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
11 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

477 
WGUS55 KSLC 170115
FFWSLC
UTC025-170715-
/O.NEW.KSLC.FF.W.0018.120717T0115Z-120717T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN KANE COUNTY IN UTAH INCLUDING WAHWEAP...WARM AND LAST 
  CHANCE CREEKS
  
* UNTIL 115 AM MDT TUESDAY

* AT 708 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN HAS FALLEN ACROSS THE HEADWATERS OF WAHWEAP 
  CREEK...WITH ESTIMATES OF 0.75 TO 1.25 ACROSS THIS AREA. 
  ADDITIONAL HEAVY RAINFALL EXPECTED THROUGH THE EVENING.  

* FLASH FLOODING CAN BE EXPECTED ALONG WAHWEAP CREEK...WARM 
  CREEK...AND LAST CHANCE CREEK IN EASTERN KANE COUNTY.

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 3753 11171 3754 11094 3727 11096 3702 11138
      3701 11185

$$

MPS
2 follow-up statements
619 
WGUS75 KSLC 170255
FFSSLC

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

UTC025-170715-
/O.CON.KSLC.FF.W.0018.000000T0000Z-120717T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
855 PM MDT MON JUL 16 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 AM MDT FOR 
WAHWEAP CREEK ACROSS EASTERN KANE COUNTY...

NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATED 0.50 TO 1 INCH OF 
RAIN FELL ACROSS THE HEADWATERS OF THE WAHWEAP DRAINAGE. LOCALLY 
HEAVY RAIN WAS ALSO OBSERVED ACROSS WARM AND LAST CHANCE CREEKS AS 
WELL. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL LIKELY CONTINUE TO 
PRODUCE FLASH FLOODING ACROSS THESE DRAINAGES THROUGH THE REMAINDER 
OF THE EVENING HOURS. 

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 3753 11171 3754 11094 3727 11096 3702 11138
      3701 11185

$$

MPS
594 
WGUS75 KSLC 170635
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1235 AM MDT TUE JUL 17 2012

UTC025-170640-
/O.CAN.KSLC.FF.W.0018.000000T0000Z-120717T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
1235 AM MDT TUE JUL 17 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EASTERN KANE
COUNTY...

RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED GREATLY AND WATER 
LEVELS IN THE WASHES HAVE DECREASED. THEREFORE...THE FLASH FLOOD 
WARNING HAS BEEN CANCELLED. CONTINUE TO USE CAUTION CROSSING ANY OF 
THE WASHES IN EASTERN KANE COUNTY THE REST OF THE NIGHT AS THERE MAY 
BE DEEP MUD WHERE THE ROAD CROSSES THE WASH. 

MONITOR NOAA WEATHER RADIO OR LOCAL TELEVISION OR RADIO FOR THE 
LATEST WEATHER INFORMATION.

LAT...LON 3753 11171 3754 11094 3727 11096 3702 11138
      3701 11185

$$

PW

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 6:03 PM MDTSpecial Weather StatementSLCKane27 min
Jul 16, 6:11 PM MDTFlash Flood WarningSLCKane8 hr
Jul 16, 6:13 PM MDTAreal Flood AdvisorySLCBox Elder, Cache, Davis, Salt Lake, Weber3 hr

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.