Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 46, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 25, 2021, 4:11 PM MDT for Iron 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
- Jul 25, 2021, 4:11 PM MDT (22:11 UTC)
- Expired
- Jul 25, 2021, 7:00 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Iron County, UT
The radar
The Cedar City radar (KICX), 21 km from the middle of the area, began a volume at 22:11 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 12:00Z, 10.2 hours before the alert went out and 287 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
- 97 J/kg
- Mixed-layer CIN
- -248 J/kg
- Mixed-layer LCL
- 2117 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 69 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
029
WGUS55 KSLC 252211
FFWSLC
UTC021-260100-
/O.NEW.KSLC.FF.W.0046.210725T2211Z-210726T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
411 PM MDT Sun Jul 25 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
The Brian Head burn scar in...
East Central Iron County in southern Utah...
* Until 700 PM MDT.
* At 411 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain over the Brian Head Burn Scar. Between 0.75 and 1.5
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 Parowan Creek drainage. 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 Brian Head
Burn Scar.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Brian Head Burn Scar.
* Some locations that will experience flash flooding include...
Parowan.
This includes the following highways...
Interstate 15 between mile markers 74 and 75. Additionally, flows
are expected over state route 143 between mile markers 6 an 10.
This includes the following streams and drainages...
Center Creek and Parowan Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3778 11284 3779 11283 3782 11282 3783 11283
3783 11289 3784 11289 3784 11282 3782 11280
3780 11280 3778 11276 3776 11277 3773 11277
3771 11280 3771 11282 3773 11284 3774 11284
3776 11284 3776 11285 3777 11285
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SW2 follow-up statements
687
WGUS75 KSLC 260016
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
616 PM MDT Sun Jul 25 2021
UTC021-260100-
/O.CON.KSLC.FF.W.0046.000000T0000Z-210726T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Iron UT-
616 PM MDT Sun Jul 25 2021
...FLASH FLOOD WARNING FOR THE BRIAN HEAD BURN SCAR REMAINS IN
EFFECT UNTIL 7 PM MDT THIS EVENING FOR EAST CENTRAL IRON COUNTY...
At 616 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain over the Brian Head Burn Scar. Between 0.75 and 1.5 inches of
rain have fallen. Flash flooding is ongoing or expected to begin
shortly.
Excessive rainfall over the burn scar will result in debris flow
moving through the Parowan Creek drainage. The debris flow can
consist of rock, mud, vegetation and other loose materials.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding in and around the Brian Head Burn Scar.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of areas in and around
the Brian Head Burn Scar.
Some locations that will experience flash flooding include...
Parowan.
This includes the following highways...
Interstate 15 between mile markers 74 and 75. Additionally, flows
are expected over state route 143 between mile markers 6 an 10.
This includes the following streams and drainages...
Center Creek and Parowan Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3778 11284 3779 11283 3782 11282 3783 11283
3783 11289 3784 11289 3784 11282 3782 11280
3780 11280 3778 11276 3776 11277 3773 11277
3771 11280 3771 11282 3773 11284 3774 11284
3776 11284 3776 11285 3777 11285
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SW949
WGUS75 KSLC 260056
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
656 PM MDT Sun Jul 25 2021
UTC021-260106-
/O.EXP.KSLC.FF.W.0046.000000T0000Z-210726T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Iron UT-
656 PM MDT Sun Jul 25 2021
...FLASH FLOOD WARNING FOR THE BRIAN HEAD BURN SCAR WILL EXPIRE AT 7
PM MDT THIS EVENING FOR EAST CENTRAL IRON COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any road closures. Runoff from
earlier heavy rainfall will continue to diminish through the evening
hours.
A Flash Flood Watch remains in effect until 1000 PM MDT for portions
of southern Utah and southwest Utah.
LAT...LON 3778 11284 3779 11283 3782 11282 3783 11283
3783 11289 3784 11289 3784 11282 3782 11280
3780 11280 3778 11276 3776 11277 3773 11277
3771 11280 3771 11282 3773 11284 3774 11284
3776 11284 3776 11285 3777 11285
$$
SWThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 7:17 PM MDT | Special Weather Statement | SLC | Garfield | 28 min |
| Jul 24, 8:08 PM MDT | Flash Flood Warning | SLC | Garfield, Kane | 3 hr |
| Jul 25, 2:25 PM MDT | Flash Flood Warning | SLC | Iron | 3 hr |
| Jul 25, 2:49 PM MDT | Special Weather Statement | SLC | Piute | 26 min |
| Jul 25, 2:53 PM MDT | Special Weather Statement | SLC | Beaver | 37 min |
| Jul 25, 3:11 PM MDT | Special Weather Statement | SLC | Piute | 34 min |
| Jul 25, 3:18 PM MDT | Special Weather Statement | SLC | Sevier | 27 min |
| Jul 25, 3:33 PM MDT | Special Weather Statement | SLC | Iron | 27 min |
| Jul 25, 3:49 PM MDT | Severe Thunderstorm Warning | SLC | Iron | 26 min |
| Jul 25, 4:21 PM MDT | Special Weather Statement | SLC | Washington | 24 min |
| Jul 25, 4:29 PM MDT | Areal Flood Advisory | SLC | Iron | 3 hr |
| Jul 25, 4:41 PM MDT | Special Weather Statement | SLC | Washington | 19 min |
| Jul 25, 4:41 PM MDT | Special Weather Statement | SLC | Iron | 49 min |
| Jul 25, 4:52 PM MDT | Flash Flood Warning | SLC | Iron, Kane, Washington | 4 hr |
| Jul 25, 5:16 PM MDT | Flash Flood Warning | SLC | Washington | 3 hr |
| Jul 25, 5:26 PM MDT | Severe Thunderstorm Warning | SLC | Washington | 19 min |
| Jul 25, 5:42 PM MDT | Severe Thunderstorm Warning | SLC | Washington | 33 min |
| Jul 25, 5:44 PM MDT | Special Weather Statement | SLC | Washington | 31 min |
| Jul 25, 5:52 PM MDT | Special Weather Statement | SLC | Washington | 23 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.