Alert archive / Utah / Flash Flood Warnings in 2011
Flash Flood Warning 55, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Sep 16, 2011, 3:08 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
- Sep 16, 2011, 3:08 PM MDT (21:08 UTC)
- Expired
- Sep 16, 2011, 6:00 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), 44 km from the middle of the area, began a volume at 21:10 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 |
|---|---|---|---|
| Sep 16, 4:43 PM MDT | FLASH FLOOD | 2 Nw Springdale, UT | WIDESPREAD FLASH FLOODING ACROSS THE SOUTHWESTERN PART OF ZION NATIONAL PARK. RAINFALL AMOUNTS OF 1.60 INCHES FELL IN A TWO HOUR PERIOD. FLOODING...ROCKFALL...AND LARGER WASHES IN FLOOD. |
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 12:00Z, 9.1 hours before the alert went out and 240 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
- 423 J/kg
- Mixed-layer CIN
- -126 J/kg
- Mixed-layer LCL
- 1888 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- -4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
213
WGUS55 KSLC 162108
FFWSLC
UTC053-170000-
/O.NEW.KSLC.FF.W.0055.110916T2108Z-110917T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
308 PM MDT FRI SEP 16 2011
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EAST CENTRAL WASHINGTON COUNTY IN UTAH
* UNTIL 600 PM MDT
* AT 300 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
HEAVY RAIN FROM A THUNDERSTORM OVER THE SCOGGINS WASH AREA IN THE
SOUTHWEST PART OF ZION NATIONAL PARK. THIS WASH WHEN FLOODING HAS
THE POTENTIAL TO CROSS SR 9 NEAR ROCKVILLE.
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 3724 11310 3727 11306 3727 11301 3716 11301
3717 11309
$$
MCINERNEY2 follow-up statements
318
WGUS75 KSLC 162220
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
420 PM MDT FRI SEP 16 2011
UTC053-170000-
/O.CON.KSLC.FF.W.0055.000000T0000Z-110917T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
420 PM MDT FRI SEP 16 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 600 PM MDT FOR EAST
CENTRAL WASHINGTON COUNTY...
AT 414 PM MDT...ZION NATIONAL PARK RANGERS REPORTED WIDESPREAD FLASH
FLOODING ACROSS THE SOUTHERN END OF THE PARK. PINE CREEK IS
CURRENTLY FLASHING 7 - 8 FEET DEEP. SPRY CANYON IS ALSO
EXPERIENCING LARGE FLASH FLOODING. ROCKFALL IS COVERING MANY ROADS
IN THE PARK...IN ADDITION TO MULTIPLE WATERFALLS ACROSS NORTH FACING
ASPECTS IN THE AREA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF YOU ARE IN ZION NATIONAL PARK OR AREAS TO THE SOUTH...PLEASE USE
CAUTION WHEN TRAVELING THROUGH THIS AREA.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 3724 11310 3727 11306 3727 11301 3716 11301
3717 11309
$$
MCINERNEY300
WGUS75 KSLC 170007
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
607 PM MDT FRI SEP 16 2011
UTC053-170006-
/O.EXP.KSLC.FF.W.0055.000000T0000Z-110917T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
607 PM MDT FRI SEP 16 2011
...THE FLASH FLOOD WARNING WILL EXPIRE AT 600 PM MDT FOR EAST CENTRAL
WASHINGTON COUNTY...
THUNDERSTORMS THAT RESULTED IN HEAVY RAIN OVER ZION NATIONAL PARK
HAVE MOVED EAST OF THE AREA. THE RUNOFF FROM THESE THUNDERSTORMS
RESULTED IN SIGNIFICANT FLASH FLOODING IN SOUTHERN PORTIONS OF THE
PARK THIS AFTERNOON. FLOODING HAS DIMINISHED ACROSS THE
AREA...THEREFORE THE WARNING HAS BEEN ALLOWED TO EXPIRE.
HOWEVER...FLOWS WILL REMAIN HIGH ON AREA STREAMS AND RUNOFF WILL
CONTINUE THROUGH AFFECTED SLOT CANYONS THROUGH THE EVENING.
LAT...LON 3724 11310 3727 11306 3727 11301 3716 11301
3717 11309
$$The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 16, 3:13 PM MDT | Severe Thunderstorm Warning | SLC | Garfield, Wayne | 62 min |
| Sep 16, 3:33 PM MDT | Flash Flood Warning | SLC | Kane, Washington | 3 hr |
| Sep 16, 3:44 PM MDT | Severe Thunderstorm Warning | SLC | Emery, Wayne | 33 min |
| Sep 16, 3:53 PM MDT | Flash Flood Warning | SLC | Kane | 4 hr |
| Sep 16, 3:54 PM MDT | Flash Flood Warning | SLC | Emery | 3 hr |
| Sep 16, 4:21 PM MDT | Severe Thunderstorm Warning | SLC | Wayne | 38 min |
| Sep 16, 4:39 PM MDT | Severe Thunderstorm Warning | SLC | Garfield | 50 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.