Alert archive / Utah / Flash Flood Warnings in 2012
Flash Flood Warning 34, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 31, 2012, 6:30 PM MDT for Iron County, Utah. It was in force for 4 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, 2012, 6:30 PM MDT (00:30 UTC)
- Expired
- Jul 31, 2012, 10:30 PM MDT
- In force
- 4 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Flood severity
- None
County Iron County, UT
The radar
The Cedar City radar (KICX), 16 km from the middle of the area, began a volume at 00:31 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 00:00Z, 0.5 hours before the alert went out and 267 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
- 646 J/kg
- Mixed-layer CIN
- -52 J/kg
- Mixed-layer LCL
- 1370 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
191 WGUS55 KSLC 010030 FFWSLC UTC021-010430- /O.NEW.KSLC.FF.W.0034.120801T0030Z-120801T0430Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SALT LAKE CITY UT 630 PM MDT TUE JUL 31 2012 THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTH CENTRAL IRON COUNTY IN UTAH * UNTIL 1030 PM MDT * AT 624 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED HEAVY RAIN FROM A THUNDERSTORM OVER THE COAL CREEK DRAINAGE JUST EAST OF CEDAR CITY. THIS WATERSHED ALSO HAS HAD PRIOR ISSUES WITH LANDSLIDES ALONG SR14 AND THE INTENSE RAINFALL MAY INCREASE ROCKFALL IN THE AREA. RAINFALL AMOUNTS OF OVER AN INCH IN A SHORT PERIOD OF TIME HAS FALLEN OVER THIS DRAINAGE...AND FLASH FLOODING IS ANTICIPATED AS COAL CREEK FLOWS THROUGH CEDAR CITY. 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 3771 11310 3768 11280 3758 11287 3767 11318 $$ MCINERNEY
2 follow-up statements
317 WGUS75 KSLC 010241 FFSSLC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 841 PM MDT TUE JUL 31 2012 UTC021-010430- /O.CON.KSLC.FF.W.0034.000000T0000Z-120801T0430Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ IRON UT- 841 PM MDT TUE JUL 31 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM MDT FOR SOUTH CENTRAL IRON COUNTY... AT 830 PM MDT...SR 143 NEAR THE BRIANHEAD SKI AREA HAS BEEN CLOSED DUE TO FLASH FLOODING. THIS ROAD IS LOCATED IN THE HEADWATERS OF COAL CREEK DRAINAGE EAST OF CEDAR CITY. ADDITIONAL THUNDERSTORM ACTIVITY THROUGHOUT THE DRAINAGE IS EXPECTED THROUGH 1030PM. PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. && LAT...LON 3771 11310 3768 11280 3758 11287 3767 11318 $$ MCINERNEY
603 WGUS75 KSLC 010425 FFSSLC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 1025 PM MDT TUE JUL 31 2012 UTC021-010432- /O.EXP.KSLC.FF.W.0034.000000T0000Z-120801T0430Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ IRON UT- 1025 PM MDT TUE JUL 31 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 1030 PM MDT FOR SOUTH CENTRAL IRON COUNTY... HEAVY RAIN HAS ENDED ACROSS THE AREA. WHILE FLASH FLOODING IS NO LONGER EXPECTED ACROSS THE COAL CREEK DRAINAGE BASIN...RUNOFF MAY CONTINUE FOR SEVERAL MORE HOURS. IN ADDITION...WHILE TRAVELING ALONG STATE ROUTE 14 THIS EVENING AND INTO THE OVERNIGHT HOURS...BE ON THE LOOKOUT FOR ROCKFALLS FROM EARLIER HEAVY RAIN AS PREVIOUS FLASH FLOODS HAVE CAUSED ROCKFALLS TO THE ROAD. 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 3771 11310 3768 11280 3758 11287 3767 11318 $$ KRUSE
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 6:30 PM MDT | Special Weather Statement | SLC | Kane | 30 min |
| Jul 31, 10:51 PM MDT | Flash Flood Warning | SLC | Washington | 4 hr |
| Aug 1, 2:30 AM MDT | Flash Flood Watch | SLC | 20 hr | |
| Aug 1, 2:51 PM MDT | Flash Flood Warning | SLC | Garfield | 4 hr |
| Aug 1, 3:09 PM MDT | Flash Flood Warning | SLC | Garfield, Kane | 6 hr |
| Aug 1, 4:05 PM MDT | Flash Flood Warning | SLC | Kane | 4 hr |
| Aug 1, 5:17 PM MDT | Flash Flood Warning | SLC | Washington | 4 hr |
| Aug 1, 5:23 PM MDT | Flash Flood Warning | SLC | Kane, Washington | 4 hr |
| Aug 1, 5:27 PM MDT | Flash Flood Warning | SLC | Carbon, Emery | 4 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.