Alert archive / Utah / Flash Flood Warnings in 2011
Flash Flood Warning 20, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 31, 2011, 6:21 PM MDT for Kane County, Utah. It was in force for 3 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 31, 2011, 6:21 PM MDT (00:21 UTC)
- Expired
- Jul 31, 2011, 9:15 PM MDT
- In force
- 3 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), 135 km from the middle of the area, began a volume at 00:21 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, 0.4 hours before the alert went out and 238 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2268 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -17 m²/s²
- 0-3 km storm-relative helicity
- -18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
234
WGUS55 KSLC 010021
FFWSLC
UTC025-010315-
/O.NEW.KSLC.FF.W.0020.110801T0021Z-110801T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
621 PM MDT SUN JUL 31 2011
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EAST CENTRAL KANE COUNTY IN UTAH...
* UNTIL 915 PM MDT
* AT 616 PM MDT...HEAVY RAINFALL HAS FALLEN OVER THE CROTON CANYON
DRAINAGE IN EAST CENTRAL KANE COUNTY.
* UP TO 1.5 INCHES OF RAIN HAS FALLEN IN THE PAST HOUR. FLASH
FLOODING IS EXPECTED IN THE CROTON CANYON DRAINAGE FROM THE
HEADWATERS TO THE TERMINATION AT LAKE POWELL.
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 3748 11147 3750 11131 3722 11123 3716 11130
3722 11138
$$
KRUSE2 follow-up statements
611
WGUS75 KSLC 010210
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
810 PM MDT SUN JUL 31 2011
UTC025-010315-
/O.CON.KSLC.FF.W.0020.000000T0000Z-110801T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
810 PM MDT SUN JUL 31 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MDT FOR EAST
CENTRAL KANE COUNTY...
AT 759 PM MDT...ALTHOUGH THE THUNDERSTORMS THAT PRODUCED HEAVY
RAINFALL OVER CROTON CREEK AREA HAVE MOVED AWAY...DRY WASHES AND
SMALL STREAMS IN THIS AREA ARE LIKELY RUNNING HIGH AN WILL SO FOR
ANOTHER HOUR OR SO.
THIS THUNDERSTORM WITH EXCESSIVE RAIN WILL OTHERWISE REMAIN OVER
MAINLY RURAL AREAS OF THE INDICATED COUNTY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 3748 11147 3750 11131 3722 11123 3716 11130
3722 11138
$$
STRUTHWOLF842
WGUS75 KSLC 010316
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
916 PM MDT SUN JUL 31 2011
UTC025-010324-
/O.EXP.KSLC.FF.W.0020.000000T0000Z-110801T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
916 PM MDT SUN JUL 31 2011
...THE FLASH FLOOD WARNING WILL EXPIRE AT 915 PM MDT FOR EAST CENTRAL
KANE COUNTY...
HEAVY RAIN HAS ENDED OVER THE CROTON CANYON DRAINAGE IN EAST CENTRAL
KANE COUNTY. RUNOFF FROM THE HEAVY RAIN EARLIER WILL GRADUALLY
DECREASE THROUGH THE REST OF THE EVENING.
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 3748 11147 3750 11131 3722 11123 3716 11130
3722 11138
$$
LCThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 6:59 AM MDT | Areal Flood Advisory | SLC | Box Elder, Cache, Davis, Weber | 2 hr |
| Aug 1, 3:07 PM MDT | Flash Flood Warning | SLC | Garfield, Wayne | 3 hr |
| Aug 1, 3:35 PM MDT | Flash Flood Warning | SLC | Garfield, Wayne | 3 hr |
| Aug 1, 5:39 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 36 min |
Nearby
Flash Flood Warnings in Utah, 2011Every flash flood warning in 2011
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.