Alert archive / Utah / Flash Flood Warnings in 2011
Flash Flood Warning 8, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 11, 2011, 9:10 PM MDT for Washington County, Utah. It was in force for 3 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 11, 2011, 9:10 PM MDT (03:10 UTC)
- Expired
- Jul 11, 2011, 11:46 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Flood severity
- None
County Washington County, UT
The radar
The Cedar City radar (KICX), 39 km from the middle of the area, began a volume at 03:11 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 11, 9:37 PM MDT | FLASH FLOOD | Zion Np, UT | FLASH FLOOD REPORTED ALONG THE NORTH FORK OF THE VIRGIN. AREAS AFFECTED WERE THE TEMPLE OF SINAWAVA, AND REFIGERATOR CANYON, WHICH IS WHERE THE HIKE TO ANGELS LANDING BEGINS. ADDITIONALLY, THE RIVER GAGE ALONG THE NORTH FORK AT SPRINGDALE-NFVU1-JUMPED FROM 103 |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Las Vegas, NV (KVEF), launched 00:00Z, 3.2 hours before the alert went out and 248 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
- 4915 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
153
WGUS55 KSLC 120310
FFWSLC
UTC053-120600-
/O.NEW.KSLC.FF.W.0008.110712T0310Z-110712T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
910 PM MDT MON JUL 11 2011
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
* FLASH FLOOD WARNING FOR...
THE NORTH FORK OF THE VIRGIN RIVER IN EAST CENTRAL WASHINGTON
COUNTY IN UTAH...
THIS INCLUDES ZION NATIONAL PARK...
* UNTIL MIDNIGHT MDT
* AT 856 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
HEAVY RAIN FROM A THUNDERSTORM OVER THE WARNED AREA.
* RADAR ESTIMATES 0.75 TO 1 INCH OF RAIN HAS FALLEN ACROSS DRAINAGES
LEADING INTO THE NORTH FORK OF THE VIRGIN RIVER OVER THE PAST HOUR.
RUNOFF FROM THIS RAINFALL WILL RESULT IN FLASH FLOODING.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO THE NORTH
FORK OF THE VIRGIN RIVER INCLUDING THE ZION NARROWS AND TELEPHONE
CANYON.
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 3726 11300 3734 11301 3735 11290 3727 11290
3715 11297 3716 11310
$$
CHENG2 follow-up statements
256
WGUS75 KSLC 120441
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1041 PM MDT MON JUL 11 2011
UTC053-120600-
/O.CON.KSLC.FF.W.0008.000000T0000Z-110712T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
1041 PM MDT MON JUL 11 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT FOR
THE NORTH FORK OF THE VIRGIN RIVER IN EAST CENTRAL WASHINGTON
COUNTY...
AT 1024 PM MDT...ZION NATIONAL PARK RANGERS REPORTED FLASH FLOODING
OCCURRING ALONG THE NORTH FORK OF THE VIRGIN RIVER...IN REFRIGERATOR
CANYON...AND NEAR THE TEMPLE OF SINAWAVA. RUNOFF FROM THE HEAVY RAIN
EARLIER WILL CONTINUE TO PRODUCE FLASH FLOODING ALONG THE NORTH FORK
OF THE VIRGIN RIVER...INCLUDING THE ZION NARROWS...THROUGH MIDNIGHT
TONIGHT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.
&&
LAT...LON 3726 11300 3734 11301 3735 11290 3727 11290
3715 11297 3716 11310
$$
CHENG254
WGUS75 KSLC 120546
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1146 PM MDT MON JUL 11 2011
UTC053-120547-
/O.CAN.KSLC.FF.W.0008.000000T0000Z-110712T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
1146 PM MDT MON JUL 11 2011
...THE FLASH FLOOD WARNING FOR THE NORTH FORK OF THE VIRGIN RIVER IN
ZION NATIONAL PARK IN EAST CENTRAL WASHINGTON COUNTY HAS BEEN
CANCELLED...
THE THUNDERSTORM THAT BROUGHT HEAVY RAIN AND FLASH FLOODING TO
REFRIGERATOR CANYON IN ZION NATIONAL PARK HAS MOVED OUT OF THE
REGION AND DISSIPATED. WATERS HAVE RECEDED ON THE NORTH FORK OF THE
VIRGIN AND ARE NO LONGER A THREAT TO FLOODING.
LAT...LON 3726 11300 3734 11301 3735 11290 3727 11290
3715 11297 3716 11310
$$
STRUTHWOLFThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 3:07 PM MDT | Severe Thunderstorm Warning | SLC | Emery | 38 min |
| Jul 12, 3:30 PM MDT | Fire Weather Watch | SLC | 37 hr |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.