Alert archive / Utah / Flash Flood Warnings in 2012
Flash Flood Warning 43, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 10, 2012, 12:29 PM MDT for Emery 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 10, 2012, 12:29 PM MDT (18:29 UTC)
- Expired
- Aug 10, 2012, 3:30 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Flood severity
- None
County Emery County, UT
The radar
The Salt Lake City radar (KMTX), 219 km from the middle of the area, began a volume at 18:32 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
Salt Lake City I, UT (KSLC), launched 12:00Z, 6.5 hours before the alert went out and 150 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
- 3217 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
162
WGUS55 KSLC 101829
FFWSLC
UTC015-102130-
/O.NEW.KSLC.FF.W.0043.120810T1829Z-120810T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1229 PM MDT FRI AUG 10 2012
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHWESTERN EMERY COUNTY IN UTAH...SPECIFICALLY THE SEELEY
BURN SCAR
* UNTIL 330 PM MDT
* AT 1223 PM MDT...DOPPLER RADAR INDICATED 0.25 TO 0.50 INCHES OF
RAIN HAS FALLEN ON THE SEELEY BURN SCAR IN THE PAST 30 MINUTES.
* IT IS EXPECTED THAT THIS AMOUNT OF RAINFALL WILL RESULT IN FLASH
FLOODING AND A DEBRIS FLOW WHICH WILL IMPACT THE HUNTINGTON
POWER PLANT LOCATED JUST UPSTREAM OF THE TOWN OF HUNTINGTON.
DEBRIS AND ASH MAY ALSO IMPACT THE HUNTINGTON/CLEVELAND
IRRIGATION COMPANY. MUD AND WATER WILL ALSO LIKELY FLOW ACROSS
HIGHWAY 31 THROUGH HUNTINGTON CANYON.
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 3949 11112 3949 11121 3960 11121 3961 11117
3961 11115 3960 11114
$$
MPS2 follow-up statements
155
WGUS75 KSLC 102026
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
226 PM MDT FRI AUG 10 2012
UTC015-102130-
/O.CON.KSLC.FF.W.0043.000000T0000Z-120810T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
EMERY UT-
226 PM MDT FRI AUG 10 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 PM MDT FOR THE
SEELEY BURN SCAR IN NORTHWESTERN EMERY COUNTY...
AT 221 PM MDT...DOPPLER RADAR INDICATED THAT 0.25 TO 0.50 INCHES HAS
FALLEN ACROSS THE SEELEY BURN SCAR...WITH LOCALLY HIGHER TOTALS
ALONG THE EASTERN EDGE. THIS AMOUNT OF RAINFALL IS SUFFICIENT TO
CAUSE A DEBRIS FLOW FROM THE BURN SCAR...WHICH WILL LIKELY REACH
HIGHWAY 31 BY 3 PM. ADDITIONALLY...THE HUNTINGTON POWER PLANT
LOCATED JUST UPSTREAM OF THE TOWN OF HUNTINGTON AND THE
HUNTINGTON/CLEVELAND IRRIGATION COMPANY WILL LIKELY BE IMPACTED.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 3949 11112 3949 11121 3960 11121 3961 11117
3961 11115 3960 11114
$$
MPS478
WGUS75 KSLC 102127
FFSSLC
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
327 PM MDT FRI AUG 10 2012
UTC015-102136-
/O.EXP.KSLC.FF.W.0043.000000T0000Z-120810T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
EMERY UT-
327 PM MDT FRI AUG 10 2012
...THE FLASH FLOOD WARNING WILL EXPIRE AT 330 PM MDT FOR THE SEELEY
BURN SCAR IN NORTHWESTERN EMERY COUNTY...
THE THREAT FOR FLASH FLOODING AND A DEBRIS FLOW FROM THE SEELEY BURN
SCAR HAS ABATED. THEREFORE...THE FLASH FLOOD WARNING HAS BEEN
ALLOWED TO EXPIRE. MONITOR NOAA WEATHER RADIO OR LOCAL TELEVISION OR
RADIO FOR THE LATEST WEATHER INFORMATION.
IF A DEBRIS FLOW HAS OCCURRED IT IS IMPORTANT REALIZE THAT THE RUNOUT
AREA REMAINS VERY DANGEROUS. ADDITIONAL DEBRIS FLOWS MAY OCCUR WITHIN
MINUTES OF THE ORIGINAL FLOW. PLEASE REMAIN VIGILANT AND BE PREPARED
TO TAKE SWIFT ACTION.
LAT...LON 3949 11112 3949 11121 3960 11121 3961 11117
3961 11115 3960 11114
$$
MPSThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 12:40 PM MDT | Flash Flood Warning | SLC | Wayne | 3 hr |
| Aug 10, 1:25 PM MDT | Flash Flood Warning | SLC | Wayne | 3 hr |
| Aug 10, 4:17 PM MDT | Special Weather Statement | SLC | Emery | 43 min |
| Aug 10, 4:45 PM MDT | Special Weather Statement | SLC | Tooele | 60 min |
| Aug 10, 5:51 PM MDT | Special Weather Statement | SLC | Davis | 69 min |
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.