Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 92, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 14, 2021, 1:17 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 14, 2021, 1:17 PM MDT (19:17 UTC)
- Expired
- Aug 14, 2021, 4:15 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), 234 km from the middle of the area, began a volume at 19:18 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, 7.3 hours before the alert went out and 166 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
- 4 J/kg
- Mixed-layer CIN
- -497 J/kg
- Mixed-layer LCL
- 3291 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 28 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
411
WGUS55 KSLC 141917
FFWSLC
UTC015-142215-
/O.NEW.KSLC.FF.W.0092.210814T1917Z-210814T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
117 PM MDT Sat Aug 14 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
The Trail Mountain burn scar in...
Northwestern Emery County in central Utah...
* Until 415 PM MDT.
* At 117 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain over the Trail Mountain Burn Scar. Between 0.25 and 0.5
inches of rain have fallen. Flash flooding is ongoing or expected
to begin shortly.
Excessive rainfall over the burn scar will result in debris flow
moving through the Trail Mountain burn scar area. The debris flow
can consist of rock, mud, vegetation and other loose materials.
HAZARD...Flash flooding caused by thunderstorms in and around
the Trail Mountain Burn Scar.
SOURCE...Radar.
IMPACT...Flooding of areas in and around the Trail Mountain
Burn Scar.
* Some locations that will experience flash flooding include...
mainly rural areas of Northwestern Emery County
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move away from recently burned areas. Life-threatening flooding of
creeks, roads and normally dry washes is likely. The heavy rains
will likely trigger rock slides, mudslides and debris flows in steep
terrain, especially in and around these areas.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3939 11123 3939 11122 3936 11122 3939 11119
3947 11121 3946 11115 3942 11116 3941 11112
3938 11110 3936 11111 3938 11119 3935 11123
FLASH FLOOD...RADAR INDICATED
$$
AW2 follow-up statements
127
WGUS75 KSLC 142041
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
241 PM MDT Sat Aug 14 2021
UTC015-142215-
/O.CON.KSLC.FF.W.0092.000000T0000Z-210814T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emery UT-
241 PM MDT Sat Aug 14 2021
...FLASH FLOOD WARNING FOR THE TRAIL MOUNTAIN BURN SCAR REMAINS IN
EFFECT UNTIL 415 PM MDT THIS AFTERNOON FOR NORTHWESTERN EMERY
COUNTY...
At 241 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain over the Trail Mountain Burn Scar. Between 0.25 and 0.5 inches
of rain have fallen. Flash flooding is ongoing or expected to begin
shortly.
Excessive rainfall over the burn scar will result in debris flow
moving through the Trail Mountain burn scar area. The debris flow
can consist of rock, mud, vegetation and other loose materials.
HAZARD...Flash flooding caused by thunderstorms in and around the
Trail Mountain Burn Scar.
SOURCE...Radar.
IMPACT...Flooding of areas in and around the Trail Mountain Burn
Scar.
Some locations that will experience flash flooding include...
mainly rural areas of Northwestern Emery County
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move away from recently burned areas. Life-threatening flooding of
creeks, roads and normally dry washes is likely. The heavy rains
will likely trigger rock slides, mudslides and debris flows in steep
terrain, especially in and around these areas.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3939 11123 3939 11122 3936 11122 3939 11119
3947 11121 3946 11115 3942 11116 3941 11112
3938 11110 3936 11111 3938 11119 3935 11123
FLASH FLOOD...RADAR INDICATED
$$
AW092
WGUS75 KSLC 142216
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
416 PM MDT Sat Aug 14 2021
UTC015-142226-
/O.EXP.KSLC.FF.W.0092.000000T0000Z-210814T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emery UT-
416 PM MDT Sat Aug 14 2021
...FLASH FLOOD WARNING FOR THE TRAIL MOUNTAIN BURN SCAR HAS EXPIRED
FOR NORTHWESTERN EMERY COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3939 11123 3939 11122 3936 11122 3939 11119
3947 11121 3946 11115 3942 11116 3941 11112
3938 11110 3936 11111 3938 11119 3935 11123
$$
AWThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 3:19 PM MDT | Special Weather Statement | SLC | Iron | 41 min |
| Aug 14, 3:35 PM MDT | Special Weather Statement | SLC | 40 min | |
| Aug 14, 4:47 PM MDT | Flash Flood Warning | SLC | Kane, Washington | 3 hr |
| Aug 14, 5:14 PM MDT | Special Weather Statement | SLC | Washington | 46 min |
| Aug 14, 5:25 PM MDT | Severe Thunderstorm Warning | SLC | Washington | 36 min |
Nearby
Flash Flood Warnings in Utah, 2021Every flash flood warning in 2021
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.