Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 18, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 19, 2021, 1:44 PM MDT for Kane County, Washington County, Utah. It was in force for 5 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 19, 2021, 1:44 PM MDT (19:44 UTC)
- Expired
- Jul 19, 2021, 6:15 PM MDT
- In force
- 5 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Kane County, UT, Washington County, UT
The radar
The Cedar City radar (KICX), 45 km from the middle of the area, began a volume at 19:44 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
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 7.7 hours before the alert went out and 237 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
- 96 J/kg
- Mixed-layer CIN
- -89 J/kg
- Mixed-layer LCL
- 1290 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
800
WGUS55 KSLC 191944
FFWSLC
UTC025-053-192245-
/O.NEW.KSLC.FF.W.0018.210719T1944Z-210719T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
144 PM MDT Mon Jul 19 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
West Central Kane County in southern Utah...
Eastern Washington County in southwestern Utah...
* Until 445 PM MDT.
* At 144 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.75 and 1.25 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...
the East Fork of the Virgin River through Zion National Park to
the confluence of Shunes Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3719 11289 3719 11286 3718 11283 3718 11280
3722 11279 3723 11275 3723 11274 3720 11272
3717 11277 3717 11280 3717 11284 3718 11288
3717 11290 3717 11292 3715 11296 3715 11299
3716 11299 3718 11292
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SW3 follow-up statements
935
WGUS75 KSLC 192138
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
338 PM MDT Mon Jul 19 2021
UTC025-053-192245-
/O.CON.KSLC.FF.W.0018.000000T0000Z-210719T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-Washington UT-
338 PM MDT Mon Jul 19 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM MDT THIS
AFTERNOON FOR WEST CENTRAL KANE AND EASTERN WASHINGTON COUNTIES...
At 338 PM MDT, the public reported flash flooding across the warned
area. Between 0.75 and 1.25 inches of rain have fallen. Flash
flooding is already occurring.
HAZARD...Life threatening flash flooding. Heavy rain producing
flash flooding.
SOURCE...Public reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
the East Fork of the Virgin River through Zion National Park to
the confluence of Shunes Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3719 11289 3719 11286 3718 11283 3718 11280
3722 11279 3723 11275 3723 11274 3720 11272
3717 11277 3717 11280 3717 11284 3718 11288
3717 11290 3717 11292 3715 11296 3715 11299
3716 11299 3718 11292
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SW071
WGUS55 KSLC 192231
FFWSLC
UTC025-053-200015-
/O.EXT.KSLC.FF.W.0018.000000T0000Z-210720T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
431 PM MDT Mon Jul 19 2021
The National Weather Service in Salt Lake City has extended the
* Flash Flood Warning for...
West Central Kane County in southern Utah...
Eastern Washington County in southwestern Utah...
* Until 615 PM MDT.
* At 431 PM MDT, the public reported flash flooding across the
warned area. Between 1 and 2 inches of rain have fallen. Flash
flooding is already occurring.
HAZARD...Life threatening flash flooding. Heavy rain producing
flash flooding.
SOURCE...Public reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
the East Fork of the Virgin River through Zion National Park.
This includes the following streams and drainages...
South Creek, Shunes Creek, Meadow Creek and East Fork Virgin River.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3719 11289 3719 11286 3718 11283 3718 11280
3722 11279 3723 11275 3723 11274 3720 11272
3717 11277 3717 11280 3717 11284 3718 11288
3717 11290 3717 11292 3715 11296 3715 11299
3716 11299 3718 11292
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SW569
WGUS75 KSLC 200011
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
611 PM MDT Mon Jul 19 2021
UTC025-053-200021-
/O.EXP.KSLC.FF.W.0018.000000T0000Z-210720T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-Washington UT-
611 PM MDT Mon Jul 19 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 615 PM MDT THIS EVENING FOR
WEST CENTRAL KANE AND EASTERN WASHINGTON COUNTIES...
The heavy rain has ended. Flash flooding was reported through the
East Fork of the Virgin River, but is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 1200 AM MDT for portions
of central Utah, southern Utah and southwest Utah.
LAT...LON 3719 11289 3719 11286 3718 11283 3718 11280
3722 11279 3723 11275 3723 11274 3720 11272
3717 11277 3717 11280 3717 11284 3718 11288
3717 11290 3717 11292 3715 11296 3715 11299
3716 11299 3718 11292
$$
SWThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 7:02 PM MDT | Special Weather Statement | SLC | Tooele | 43 min |
| Jul 18, 7:54 PM MDT | Special Weather Statement | SLC | Tooele | 51 min |
| Jul 19, 4:32 AM MDT | Flash Flood Watch | SLC | Beaver, Carbon, Duchesne, Emery, Garfield, Iron and 12 more | 19 hr |
| Jul 19, 2:34 PM MDT | Flash Flood Warning | SLC | Iron, Washington | 3 hr |
| Jul 19, 2:45 PM MDT | Areal Flood Advisory | SLC | Iron | 3 hr |
| Jul 19, 2:53 PM MDT | Special Weather Statement | SLC | Iron | 52 min |
| Jul 19, 3:04 PM MDT | Flash Flood Warning | SLC | Iron | 3 hr |
| Jul 19, 3:22 PM MDT | Severe Thunderstorm Warning | SLC | Iron | 38 min |
| Jul 19, 3:46 PM MDT | Special Weather Statement | SLC | Utah | 44 min |
| Jul 19, 4:54 PM MDT | Special Weather Statement | SLC | Davis, Salt Lake | 36 min |
| Jul 19, 5:57 PM MDT | Flash Flood Warning | SLC | Iron, Washington | 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.