Alert archive / Utah / Flash Flood Warnings in 2012
Flash Flood Warning 47, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 17, 2012, 7:15 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
- Aug 17, 2012, 7:15 PM MDT (01:15 UTC)
- Expired
- Aug 17, 2012, 10:10 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), 58 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 17, 7:45 PM MDT | FLASH FLOOD | Hildale, UT | SEVERAL REPORTS OF FLOODING IN HILDALE |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 1.3 hours before the alert went out and 232 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
- 167 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 1324 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- -31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
898 WGUS55 KSLC 180115 FFWSLC UTC053-180515- /O.NEW.KSLC.FF.W.0047.120818T0115Z-120818T0515Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SALT LAKE CITY UT 715 PM MDT FRI AUG 17 2012 THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTHEASTERN WASHINGTON COUNTY IN UTAH...SPECIFICALLY IN AND AROUND THE TOWN OF HILDALE * UNTIL 1115 PM MDT * AT 707 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED HEAVY RAIN FROM A THUNDERSTORM OVER THE WARNED AREA. DOPPLER RADAR ESTIMATES OF 1.00 TO 1.50 INCHES OF RAIN HAS FALLEN IN AND NORTH OF THE TOWN OF HILDALE. AN ADDITIONAL .50 TO .75 INCHES OF RAIN CAN BE EXPECTED OVER THE NEXT 30 MINUTES. 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 3714 11302 3713 11291 3699 11292 3700 11307 $$ MERRILL
2 follow-up statements
304 WGUS75 KSLC 180253 FFSSLC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 853 PM MDT FRI AUG 17 2012 UTC053-180515- /O.CON.KSLC.FF.W.0047.000000T0000Z-120818T0515Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WASHINGTON UT- 853 PM MDT FRI AUG 17 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM MDT FOR SOUTHEASTERN WASHINGTON COUNTY...SPECIFICALLY IN AND AROUND THE TOWN OF HILDALE... AT 844 PM MDT...LOCAL LAW ENFORCEMENT REPORTED SEVERAL AREAS OF FLOODING IN THE THE TOWN OF HILDALE. DOPPLER RADAR ESTIMATES OF 1.50 TO 2.0 INCHES OF WATER FELL OVER AN HOURS TIME WITHIN TOWN AND THE CANYON AREAS TO THE NORTH. THIS HEAVY RAINFALL HAS SUBSIDED BUT FLOWS ARE EXPECTED TO CONTINUE TO REMAIN ELEVATED ON SHORT CREEK THROUGH THIS EVENING. PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. && LAT...LON 3714 11302 3713 11291 3699 11292 3700 11307 $$ MERRILL
357 WGUS75 KSLC 180410 FFSSLC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 1010 PM MDT FRI AUG 17 2012 UTC053-180421- /O.CAN.KSLC.FF.W.0047.000000T0000Z-120818T0515Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WASHINGTON UT- 1010 PM MDT FRI AUG 17 2012 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHEASTERN WASHINGTON COUNTY... RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED GREATLY AND RIVER AND STREAM LEVELS HAVE DECREASED. THEREFORE...THE FLASH FLOOD WARNING HAS BEEN CANCELLED. MONITOR NOAA WEATHER RADIO OR LOCAL TELEVISION OR RADIO FOR THE LATEST WEATHER INFORMATION. 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 3714 11302 3713 11291 3699 11292 3700 11307 $$ MPS
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 6:34 PM MDT | Flash Flood Warning | SLC | Washington | 3 hr |
| Aug 18, 2:10 PM MDT | Red Flag Warning | SLC | Beaver, Box Elder, Davis, Iron, Juab, Millard and 5 more | 34 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.