Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 125, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 21, 2021, 9:59 PM MDT for Salt Lake County, Utah. It was in force for 91 min. 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 21, 2021, 9:59 PM MDT (03:59 UTC)
- Expired
- Aug 21, 2021, 11:30 PM MDT
- In force
- 91 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Salt Lake County, UT
The radar
The Salt Lake City radar (KMTX), 89 km from the middle of the area, began a volume at 04:02 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 00:00Z, 4.0 hours before the alert went out and 22 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
- 422 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 2862 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 84 m²/s²
- 0-3 km storm-relative helicity
- 171 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
The text
As transmitted.
331
WGUS55 KSLC 220359
FFWSLC
UTC035-220530-
/O.NEW.KSLC.FF.W.0125.210822T0359Z-210822T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
959 PM MDT Sat Aug 21 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
The Parleys Canyon burn scar in...
Northeastern Salt Lake County in northern Utah...
* Until 1130 PM MDT.
* At 959 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain over the Parleys Canyon Burn Scar. Up to 0.5 inches of
rain have fallen and additional rainfall is expected. Flash
flooding is ongoing or expected to begin shortly.
Excessive rainfall over the burn scar will result in debris flow
moving through the Parleys Canyon Burn Scar. The debris flow can
consist of rock, mud, vegetation and other loose materials.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding in and around the Parleys
Canyon Burn Scar.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Parleys Canyon Burn Scar.
* Some locations that will experience flash flooding include...
mainly rural areas of Northeastern Salt Lake County
This includes the following highways...
Interstate 80 in Utah between mile markers 137 and 138.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4074 11166 4075 11164 4073 11163 4073 11164
4074 11167
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CRK2 follow-up statements
145
WGUS75 KSLC 220444
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
1044 PM MDT Sat Aug 21 2021
UTC035-220530-
/O.CON.KSLC.FF.W.0125.000000T0000Z-210822T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Salt Lake UT-
1044 PM MDT Sat Aug 21 2021
...FLASH FLOOD WARNING FOR THE PARLEYS CANYON BURN SCAR REMAINS IN
EFFECT UNTIL 1130 PM MDT THIS EVENING FOR NORTHEASTERN SALT LAKE
COUNTY...
At 1044 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain over the Parleys Canyon Burn Scar. Between 0.5 and 0.75
inches of rain have fallen. Flash flooding is ongoing or expected to
begin shortly.
Excessive rainfall over the burn scar will result in debris flow
moving through the Parleys Canyon Burn Scar. The debris flow can
consist of rock, mud, vegetation and other loose materials.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding in and around the Parleys Canyon Burn
Scar.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Parleys Canyon Burn Scar.
Some locations that will experience flash flooding include...
mainly rural areas of Northeastern Salt Lake County
This includes the following highways...
Interstate 80 in Utah near mile marker 138.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4074 11166 4075 11164 4073 11163 4073 11164
4074 11167
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CRK631
WGUS75 KSLC 220521
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
1121 PM MDT Sat Aug 21 2021
UTC035-220531-
/O.EXP.KSLC.FF.W.0125.000000T0000Z-210822T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Salt Lake UT-
1121 PM MDT Sat Aug 21 2021
...FLASH FLOOD WARNING FOR THE PARLEYS CANYON BURN SCAR WILL EXPIRE
AT 1130 PM MDT THIS EVENING FOR NORTHEASTERN SALT LAKE COUNTY...
The heavy rain has ended. Be careful for debris on I-80 near the
burn scar through the overnight period.
LAT...LON 4074 11166 4075 11164 4073 11163 4073 11164
4074 11167
$$
CRKThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 6:06 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder, Cache, Davis, Morgan, Rich, Salt Lake and 3 more | 39 min |
| Aug 21, 6:29 PM MDT | Severe Thunderstorm Warning | SLC | Cache, Rich | 61 min |
| Aug 21, 6:40 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder, Cache, Davis, Morgan, Rich, Salt Lake and 3 more | 50 min |
| Aug 21, 6:59 PM MDT | Areal Flood Advisory | SLC | Davis, Weber | 2 hr |
| Aug 21, 7:08 PM MDT | Severe Thunderstorm Warning | SLC | Summit | 37 min |
| Aug 21, 7:23 PM MDT | Special Weather Statement | SLC | Salt Lake | 37 min |
| Aug 21, 7:33 PM MDT | Areal Flood Advisory | SLC | Davis, Morgan, Salt Lake, Summit | 117 min |
| Aug 21, 7:41 PM MDT | Special Weather Statement | SLC | Summit | 49 min |
| Aug 21, 7:49 PM MDT | Special Weather Statement | SLC | Duchesne | 41 min |
| Aug 21, 8:09 PM MDT | Special Weather Statement | SLC | Summit | 51 min |
| Aug 21, 8:14 PM MDT | Special Weather Statement | SLC | 31 min | |
| Aug 21, 8:19 PM MDT | Severe Thunderstorm Warning | SLC | Duchesne, Summit | 26 min |
| Aug 21, 8:32 PM MDT | High Wind Warning | SLC | Utah | 3 hr |
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.