Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 81, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 1, 2021, 3:35 PM MDT for Iron County, Utah. It was in force for 3 hr. 2 reports 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
- Aug 1, 2021, 3:35 PM MDT (21:35 UTC)
- Expired
- Aug 1, 2021, 6:45 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Emergency
- Flash flood emergency
- Damage threat
- Considerable
- Flood severity
- None
County Iron County, UT
The radar
The Cedar City radar (KICX), 27 km from the middle of the area, began a volume at 21:37 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 |
|---|---|---|---|
| Aug 1, 4:19 PM MDT | FLASH FLOOD | Cedar City, UT | MULTIPLE REPORTS OF WATER FLOWING THROUGH ROADWAYS. WATER ERODED A PORTION OF A ROAD AND DAMAGED IT. |
| Aug 1, 4:19 PM MDT | FLASH FLOOD | Enoch, UT | COUNTY EMERGENCY MANAGEMENT REPORTS 100 HOMES UNDERWATER IN THE CITY OF ENOCH. FIDDLERS CANYON IS UNDERWATER. PORTIONS OF I-15 ARE CLOSED. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Las Vegas, NV (KVEF), launched 12:00Z, 9.6 hours before the alert went out and 271 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
- 680 J/kg
- Mixed-layer CIN
- -99 J/kg
- Mixed-layer LCL
- 1983 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 27 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
407
WGUS55 KSLC 012135
FFWSLC
UTC021-020045-
/O.NEW.KSLC.FF.W.0081.210801T2135Z-210802T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
335 PM MDT Sun Aug 1 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
Central Iron County in southern Utah...
* Until 645 PM MDT.
* At 335 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Cedar City, Enoch and Summit.
This includes the following highways...
Interstate 15 between mile markers 60 and 69.
Utah Route 56 near mile marker 61.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
Remain alert for flooding even in locations not receiving rain. Dry
washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3786 11311 3788 11295 3768 11296 3766 11308
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CRK5 follow-up statements
149
WGUS75 KSLC 012206
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
406 PM MDT Sun Aug 1 2021
UTC021-020045-
/O.CON.KSLC.FF.W.0081.000000T0000Z-210802T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Iron UT-
406 PM MDT Sun Aug 1 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM MDT THIS
EVENING FOR CENTRAL IRON COUNTY...
At 406 PM MDT, local law enforcement reported flash flooding in
Enoch, Summit and Cedar City. Between 1 and 2 inches of rain have
fallen. Flash flooding is already occurring. DO NOT DRIVE INTO
FLOODED AREAS.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Law enforcement reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Cedar City, Enoch and Summit.
This includes the following highways...
Interstate 15 between mile markers 58 and 69.
Utah Route 56 near mile marker 61.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
Remain alert for flooding even in locations not receiving rain. Dry
washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3786 11311 3788 11295 3768 11296 3766 11308
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CRK577
WGUS75 KSLC 012219
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
419 PM MDT Sun Aug 1 2021
UTC021-020045-
/O.CON.KSLC.FF.W.0081.000000T0000Z-210802T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Iron UT-
419 PM MDT Sun Aug 1 2021
...FLASH FLOOD EMERGENCY FOR ENOCH AND CEDAR CITY...
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM MDT THIS
EVENING FOR CENTRAL IRON COUNTY...
At 419 PM MDT, local law enforcement reported thunderstorms
producing heavy rain in Enoch, Summit and Cedar City. Between 1 and
2 inches of rain have fallen. Flash flooding is already occurring.
This is a FLASH FLOOD EMERGENCY for Enoch and Cedar City. This is a
PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW!
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Law enforcement reported.
IMPACT...This is a PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER
GROUND NOW! Life threatening flash flooding of low water
crossings, small creeks and streams, urban areas,
highways, streets and underpasses.
Some locations that will experience flash flooding include...
Cedar City, Enoch and Summit.
This includes the following highways...
Interstate 15 between mile markers 58 and 69.
Utah Route 56 near mile marker 61.
Local emergency management reports many homes underwater and water
rescues are being performed.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to higher ground now! This is an extremely dangerous and
life-threatening situation. Do not attempt to travel unless you are
fleeing an area subject to flooding or under an evacuation order.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
Remain alert for flooding even in locations not receiving rain. Dry
washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3786 11311 3788 11295 3768 11296 3766 11308
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CATASTROPHIC
$$
CRK793
WGUS75 KSLC 012354
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
554 PM MDT Sun Aug 1 2021
UTC021-020045-
/O.CON.KSLC.FF.W.0081.000000T0000Z-210802T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Iron UT-
554 PM MDT Sun Aug 1 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM MDT THIS
EVENING FOR CENTRAL IRON COUNTY...
At 554 PM MDT, local law enforcement reported thunderstorms
producing heavy rain in Enoch, Summit and Cedar City. Between 1.5
and 3 inches of rain have fallen. Flash flooding is already
occurring.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Law enforcement reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Cedar City, Enoch and Summit.
This includes the following highways...
Interstate 15 between mile markers 58 and 69.
Utah Route 56 near mile marker 61.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
Remain alert for flooding even in locations not receiving rain. Dry
washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3786 11311 3788 11295 3768 11296 3766 11308
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CRK514
WGUS75 KSLC 020016
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
616 PM MDT Sun Aug 1 2021
UTC021-020045-
/O.CON.KSLC.FF.W.0081.000000T0000Z-210802T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Iron UT-
616 PM MDT Sun Aug 1 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM MDT THIS
EVENING FOR CENTRAL IRON COUNTY...
At 616 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain in Enoch, Summit and Cedar City. Between 1.5 and 3 inches of
rain have fallen. Additional rainfall amounts of 0.25 to 0.75 inches
are possible in the warned area. Flash flooding is already occurring.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Cedar City, Enoch and Summit.
This includes the following highways...
Interstate 15 between mile markers 58 and 69.
Utah Route 56 near mile marker 61.
An additional period of moderate to heavy rainfall will cross Cedar
City, Enoch and Summit over the next 30 minutes to 1 hour.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
Remain alert for flooding even in locations not receiving rain. Dry
washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
&&
LAT...LON 3786 11311 3788 11295 3768 11296 3766 11308
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CRK891 WGUS75 KSLC 020039 FFSSLC Flash Flood Statement National Weather Service Salt Lake City UT 639 PM MDT Sun Aug 1 2021 UTC021-020049- /O.EXP.KSLC.FF.W.0081.000000T0000Z-210802T0045Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Iron UT- 639 PM MDT Sun Aug 1 2021 ...FLASH FLOOD WARNING WILL EXPIRE AT 645 PM MDT THIS EVENING FOR CENTRAL IRON COUNTY... The heavy rain has ended. Please continue to heed remaining road closures. Enhanced runoff will continue through late evening. Do not enter flood areas. Driving into flooded areas is especially dangerous at night. A Flash Flood Watch remains in effect until 1200 AM MDT for portions of central Utah, northern Utah, southern Utah and southwest Utah. LAT...LON 3786 11311 3788 11295 3768 11296 3766 11308 $$ CRK
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 6:07 PM MDT | Special Weather Statement | SLC | Tooele | 23 min |
| Jul 31, 6:09 PM MDT | Special Weather Statement | SLC | Washington | 51 min |
| Jul 31, 6:22 PM MDT | Flash Flood Warning | SLC | Washington | 4 hr |
| Jul 31, 6:26 PM MDT | Special Weather Statement | SLC | Tooele | 34 min |
| Jul 31, 6:47 PM MDT | Special Weather Statement | SLC | Tooele | 28 min |
| Jul 31, 6:58 PM MDT | Severe Thunderstorm Warning | SLC | Tooele | 32 min |
| Jul 31, 7:06 PM MDT | Special Weather Statement | SLC | 24 min | |
| Jul 31, 7:44 PM MDT | Special Weather Statement | SLC | 46 min | |
| Jul 31, 7:51 PM MDT | Special Weather Statement | SLC | Tooele | 39 min |
| Jul 31, 8:03 PM MDT | Special Weather Statement | SLC | Salt Lake | 27 min |
| Jul 31, 8:28 PM MDT | Special Weather Statement | SLC | Davis | 47 min |
| Jul 31, 8:30 PM MDT | Special Weather Statement | SLC | 30 min | |
| Jul 31, 8:43 PM MDT | Special Weather Statement | SLC | Davis | 32 min |
| Jul 31, 8:52 PM MDT | Special Weather Statement | SLC | Davis | 38 min |
| Jul 31, 9:11 PM MDT | Special Weather Statement | SLC | Davis | 49 min |
| Jul 31, 9:33 PM MDT | Special Weather Statement | SLC | Davis | 27 min |
| Aug 1, 3:21 AM MDT | Flash Flood Watch | SLC | Beaver, Carbon, Duchesne, Emery, Garfield, Iron and 13 more | 21 hr |
| Aug 1, 12:47 PM MDT | Flash Flood Warning | SLC | Garfield | 3 hr |
| Aug 1, 1:23 PM MDT | Areal Flood Advisory | SLC | Sevier | 112 min |
| Aug 1, 1:35 PM MDT | Flash Flood Warning | SLC | Wayne | 3 hr |
| Aug 1, 1:58 PM MDT | Flash Flood Warning | SLC | Duchesne, Wasatch | 3 hr |
| Aug 1, 2:52 PM MDT | Severe Thunderstorm Warning | SLC | Juab, Tooele | 38 min |
| Aug 1, 2:59 PM MDT | Areal Flood Advisory | SLC | Emery, Sevier | 2 hr |
| Aug 1, 3:25 PM MDT | Areal Flood Advisory | SLC | Iron | 11 min |
| Aug 1, 3:47 PM MDT | Special Weather Statement | SLC | Iron | 43 min |
| Aug 1, 3:55 PM MDT | Special Weather Statement | SLC | Wayne | 50 min |
| Aug 1, 3:57 PM MDT | Special Weather Statement | SLC | Juab | 48 min |
| Aug 1, 4:11 PM MDT | Severe Thunderstorm Warning | SLC | Juab, Tooele | 34 min |
| Aug 1, 4:16 PM MDT | Special Weather Statement | SLC | Washington | 44 min |
| Aug 1, 4:50 PM MDT | Special Weather Statement | SLC | Tooele | 40 min |
| Aug 1, 5:04 PM MDT | Areal Flood Advisory | SLC | Iron, Washington | 116 min |
| Aug 1, 5:15 PM MDT | Special Weather Statement | SLC | Tooele | 30 min |
| Aug 1, 5:30 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 45 min |
| Aug 1, 5:31 PM MDT | Special Weather Statement | SLC | Piute | 44 min |
| Aug 1, 5:40 PM MDT | Special Weather Statement | SLC | Salt Lake | 50 min |
| Aug 1, 5:51 PM MDT | Special Weather Statement | SLC | Tooele | 39 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.