Alert archive / Utah / Flash Flood Warnings in 2011
Flash Flood Warning 42, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 25, 2011, 5:31 PM MDT for Kane County, Washington 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
- Aug 25, 2011, 5:31 PM MDT (23:31 UTC)
- Expired
- Aug 25, 2011, 8:30 PM MDT
- In force
- 3 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), 42 km from the middle of the area, began a volume at 23:34 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 242 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
- 3885 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -26 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
074
WGUS55 KSLC 252331
FFWSLC
UTC025-053-260230-
/O.NEW.KSLC.FF.W.0042.110825T2331Z-110826T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
531 PM MDT THU AUG 25 2011
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
* FLASH FLOOD WARNING FOR...
WEST CENTRAL KANE COUNTY IN UTAH
EAST CENTRAL WASHINGTON COUNTY IN UTAH...SPECIFICALLY FOR THE
NORTH FORK OF THE VIRGIN RIVER...OAK CREEK AND EMERALD POOL IN
ZION NATIONAL PARK.
* UNTIL 830 PM MDT
* AT 522 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
HEAVY RAIN FROM A THUNDERSTORM OVER THE NORTH FORK OF THE VIRGIN
RIVER...OAK CREEK AND EMERALD POOL IN ZION NATIONAL PARK.
* VERY HEAVY RAINFALL HAS OCCURRED OVER THE LAST HOUR WITH
PRECIPITATION ESTIMATES OF 1 TO 1.5 INCHES OF RAINFALL FALLING
WITHIN THAT TIME. ADDITIONAL HEAVY RAIN WILL OCCUR AND
FLASH FLOODING IS EXPECTED IN THE ABOVE MENTIONED AREAS AND OTHER
SLOT CANYONS IN THE VICINITY.
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.
TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN SALT
LAKE CITY.
&&
LAT...LON 3720 11312 3719 11305 3740 11303 3740 11288
3714 11297 3716 11313
$$
MERRILL1 follow-up statement
348
WGUS75 KSLC 260120
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
720 PM MDT THU AUG 25 2011
UTC025-053-260230-
/O.CON.KSLC.FF.W.0042.000000T0000Z-110826T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-KANE UT-
720 PM MDT THU AUG 25 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM MDT FOR WEST
CENTRAL KANE AND EAST CENTRAL WASHINGTON COUNTIES...
AT 704 PM MDT...RADAR ESTIMATES THAT UP TO 2 INCHES OF RAIN HAS
FALLEN FROM THUNDERSTORMS ACROSS ZION NATIONAL PARK EARLIER THIS
EVENING. RUNOFF FROM THIS HEAVY RAIN WILL CONTINUE TO RESULT IN HIGH
FLOWS ALONG SMALL STREAMS AND IN SLOT CANYONS.
LOCATIONS IN THE WARNING INCLUDE THE NORTH FORK OF THE VIRGIN
RIVER...OAK CREEK AND EMERALD POOL IN ZION NATIONAL PARK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 3720 11312 3719 11305 3740 11303 3740 11288
3714 11297 3716 11313
$$
CHENGThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 25, 3:25 PM MDT | Flash Flood Warning | SLC | Wayne | 3 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.