Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 115, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 18, 2021, 7:43 PM MDT for Kane County, Utah. It was in force for 4 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 18, 2021, 7:43 PM MDT (01:43 UTC)
- Expired
- Aug 18, 2021, 11:45 PM MDT
- In force
- 4 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Kane County, UT
The radar
The Cedar City radar (KICX), 94 km from the middle of the area, began a volume at 01:46 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 00:00Z, 1.7 hours before the alert went out and 219 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
- 605 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 745 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 109 m²/s²
- 0-3 km storm-relative helicity
- 108 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.8
The text
As transmitted.
460
WGUS55 KSLC 190143
FFWSLC
UTC025-190545-
/O.NEW.KSLC.FF.W.0115.210819T0143Z-210819T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
743 PM MDT Wed Aug 18 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
Central Kane County in southern Utah...
* Until 1145 PM MDT.
* At 743 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across tributaries leading into the southern half of
the Paria River drainage. Between 0.5 and 1 inch of rain has
fallen. Additional heavy rainfall will be possible further down
the drainage basin within the next hour. 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...
mainly rural areas of Central Kane County
This includes the following highways...
US Route 89 between mile markers 21 and 22.
This includes the following streams and drainages...
Paria River, Hogeye Creek, Cottonwood Creek, and Snake Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3700 11188 3703 11189 3709 11192 3716 11194
3722 11194 3726 11198 3726 11204 3732 11205
3735 11201 3739 11196 3745 11183 3740 11183
3732 11187 3722 11191 3710 11189 3703 11185
3700 11185
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SW2 follow-up statements
505
WGUS75 KSLC 190445
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
1045 PM MDT Wed Aug 18 2021
UTC025-190545-
/O.CON.KSLC.FF.W.0115.000000T0000Z-210819T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-
1045 PM MDT Wed Aug 18 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM MDT THIS
EVENING FOR CENTRAL KANE COUNTY...
At 1045 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1 inch of rain
has fallen. Flash flooding is likely ongoing along the Paria river.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
mainly rural areas of Central Kane County
This includes the following highways...
US Route 89 between mile markers 21 and 22.
This includes the following streams and drainages...
Paria River, Wahweap Creek, Hogeye Creek, Cottonwood Creek, Snake
Creek and Coyote Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3700 11188 3703 11189 3709 11192 3716 11194
3722 11194 3726 11198 3726 11204 3732 11205
3735 11201 3739 11196 3745 11183 3740 11183
3732 11187 3722 11191 3710 11189 3703 11185
3700 11185
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MPS963
WGUS75 KSLC 190543
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
1143 PM MDT Wed Aug 18 2021
UTC025-190553-
/O.EXP.KSLC.FF.W.0115.000000T0000Z-210819T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-
1143 PM MDT Wed Aug 18 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 1145 PM MDT THIS EVENING FOR
CENTRAL KANE COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose an
imminent threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 600 AM MDT Thursday for
portions of central Utah, northern Utah and southern Utah.
LAT...LON 3700 11188 3703 11189 3709 11192 3716 11194
3722 11194 3726 11198 3726 11204 3732 11205
3735 11201 3739 11196 3745 11183 3740 11183
3732 11187 3722 11191 3710 11189 3703 11185
3700 11185
$$
MPSThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 8:01 PM MDT | Flash Flood Warning | SLC | Garfield | 3 hr |
| Aug 18, 8:46 PM MDT | Special Weather Statement | SLC | Iron | 44 min |
| Aug 18, 9:39 PM MDT | Flash Flood Warning | SLC | Iron, Washington | 3 hr |
| Aug 18, 9:48 PM MDT | Areal Flood Advisory | SLC | Iron | 5 min |
| Aug 18, 9:53 PM MDT | Flash Flood Warning | SLC | Iron | 3 hr |
| Aug 18, 10:07 PM MDT | Flash Flood Warning | SLC | Iron | 3 hr |
| Aug 18, 11:11 PM MDT | Flash Flood Warning | SLC | Kane, Washington | 5 hr |
| Aug 19, 1:43 AM MDT | Flash Flood Warning | SLC | Garfield, Wayne | 3 hr |
| Aug 19, 2:03 AM MDT | Flash Flood Warning | SLC | Garfield, Kane, San Juan | 6 hr |
| Aug 19, 2:31 AM MDT | Flash Flood Warning | SLC | Kane | 3 hr |
| Aug 19, 3:50 AM MDT | Special Weather Statement | SLC | 25 min | |
| Aug 19, 9:39 AM MDT | Special Weather Statement | SLC | Kane | 36 min |
| Aug 19, 10:16 AM MDT | River Flood Warning | SLC | Duchesne | 4 hr |
| Aug 19, 10:54 AM MDT | Special Weather Statement | SLC | Juab | 51 min |
| Aug 19, 11:15 AM MDT | Areal Flood Advisory | SLC | Millard | 2 hr |
| Aug 19, 11:42 AM MDT | Special Weather Statement | SLC | Sanpete | 48 min |
| Aug 19, 12:29 PM MDT | Special Weather Statement | SLC | Sanpete | 46 min |
| Aug 19, 12:49 PM MDT | Flash Flood Warning | SLC | Garfield, Wayne | 3 hr |
| Aug 19, 1:04 PM MDT | Special Weather Statement | SLC | Utah | 56 min |
| Aug 19, 1:25 PM MDT | Special Weather Statement | SLC | Carbon | 50 min |
| Aug 19, 2:12 PM MDT | Special Weather Statement | SLC | Carbon, Duchesne | 63 min |
| Aug 19, 2:59 PM MDT | Special Weather Statement | SLC | Duchesne | 61 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.