Alert archive / Utah / Flash Flood Warnings in 2012
Flash Flood Warning 29, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 30, 2012, 2:01 PM MDT for Juab County, Sanpete County, Utah County, Utah. It was in force for 4 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 30, 2012, 2:01 PM MDT (20:01 UTC)
- Expired
- Jul 30, 2012, 6:00 PM MDT
- In force
- 4 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Flood severity
- None
Counties Juab County, UT, Sanpete County, UT, Utah County, UT
The radar
The Salt Lake City radar (KMTX), 186 km from the middle of the area, began a volume at 20:04 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 30, 3:40 PM MDT | FLASH FLOOD | 2 Ene Fountain Green, UT | DEBRIS FLOW ORIGINATING IN THE WOOD HOLLOW BURN SCAR CROSSED SR 132 AND IMPACTED STRUCTURES WEST OF THE TOWN OF FOUNTAIN GREEN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Salt Lake City I, UT (KSLC), launched 12:00Z, 8.0 hours before the alert went out and 120 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
- 12 J/kg
- Mixed-layer CIN
- -418 J/kg
- Mixed-layer LCL
- 2952 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 66 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
305 WGUS55 KSLC 302001 FFWSLC UTC023-039-049-310000- /O.NEW.KSLC.FF.W.0029.120730T2001Z-120731T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SALT LAKE CITY UT 201 PM MDT MON JUL 30 2012 THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A * FLASH FLOOD WARNING FOR... EAST CENTRAL JUAB COUNTY IN UTAH NORTH CENTRAL SANPETE COUNTY IN UTAH SOUTH CENTRAL UTAH COUNTY IN UTAH * UNTIL 600 PM MDT * AT 154 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED HEAVY RAIN FROM A THUNDERSTORM OVER THE WOOD HOLLOW BURN SCAR ADJACENT TO THE TOWNS OF FAIRVIEW AND FOUNTAIN GREEN. * AT THE MOST RISK FROM THIS POTENTIAL DEBRIS FLOW INCLUDE STRUCTURES WITHIN THE BURN PERIMETER AND AREAS ADJACENT TO THE NATURAL DRAINAGES OF THIS BURNED AREA. IF YOU ARE WITHIN THE BURN PERIMETER...PLEASE TAKE ACTION TO ENSURE YOUR SAFETY. ADDITIONALLY...IF YOU ARE NEAR THE OUTLETS OF THE NATURAL DRAINAGES OF THE BURN SCAR...PLEASE BE VIGILANT FOR DEBRIS AND MUD FLOWS EXITING THE DRAINAGE. LAT...LON 3983 11161 3983 11144 3961 11141 3959 11166 $$ MCINERNEY
2 follow-up statements
422 WGUS75 KSLC 302213 FFSSLC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 413 PM MDT MON JUL 30 2012 UTC023-039-049-310000- /O.CON.KSLC.FF.W.0029.000000T0000Z-120731T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ JUAB UT-SANPETE UT-UTAH UT- 413 PM MDT MON JUL 30 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 600 PM MDT FOR SOUTH CENTRAL UTAH...NORTH CENTRAL SANPETE AND EAST CENTRAL JUAB COUNTIES... AT 406 PM MDT...A LARGE DEBRIS FLOW IS CURRENTLY FLOWING OUT OF THE WOOD HOLLOW BURN SCAR TOWARDS THE TOWN OF FOUNTAIN GREEN. IT IS ESTIMATED THAT MANY DRAINAGES IN THE SOUTHERN END OF THE BURN SCAR ARE PRODUCING FLASH FLOODS. DAMAGE TO MULTIPLE HOMES IN THE AREA BETWEEN FOUNTAIN GREEN AND THE BURN SCAR HAVE BEEN REPORTED. IT IS ALSO ANTICIPATED THAT SR 132 WILL BE IMPACTED AS THE FLOOD MOVES WEST TOWARDS THE ROAD. RAINFALL AMOUNTS OF OVER 1.5 INCHES HAS BEEN REPORTED DURING THIS EVENT. THIS AREA IS VERY SUSCEPTIBLE TO FLASH FLOODING DUE TO THE RECENT FIRE ACTIVITY. IT IS IMPORTANT THAT YOU ENSURE FOR YOUR SAFETY IF YOU ARE TRAVELING NEAR THIS AREA, OR ANYWHERE IN THE SOUTHERN END OF THE WOOD HOLLOW BURN SCAR. LAT...LON 3983 11161 3983 11144 3961 11141 3959 11166 $$ MCINERNEY
072 WGUS75 KSLC 310001 FFSSLC FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 601 PM MDT MON JUL 30 2012 UTC023-039-049-310005- /O.EXP.KSLC.FF.W.0029.000000T0000Z-120731T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ JUAB UT-SANPETE UT-UTAH UT- 601 PM MDT MON JUL 30 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 600 PM MDT FOR SOUTH CENTRAL UTAH...NORTH CENTRAL SANPETE AND EAST CENTRAL JUAB COUNTIES... PRECIPITATION RATES HAVE DECREASED SIGNIFICANTLY OVER THE WOOD HOLLOW BURN SCAR. AS A RESULT...RUNOFF HAS DIMINISHED AND THE THREAT OF ADDITIONAL DEBRIS FLOWS HAS DECREASED. THEREFORE...THE FLASH FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE. CONTINUE TO MONITOR NOAA WEATHER RADIO OR LOCAL TELEVISION OR RADIO FOR THE LATEST WEATHER INFORMATION. LAT...LON 3983 11161 3983 11144 3961 11141 3959 11166 $$ LC
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 3:51 AM MDT | Flash Flood Watch | SLC | 18 hr | |
| Jul 30, 1:33 PM MDT | Flash Flood Warning | SLC | Carbon, Emery | 4 hr |
| Jul 30, 4:32 PM MDT | Flash Flood Warning | SLC | Washington | 3 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.