Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 121, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 19, 2021, 1:43 AM MDT for Garfield County, Wayne 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 19, 2021, 1:43 AM MDT (07:43 UTC)
- Expired
- Aug 19, 2021, 4:30 AM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Garfield County, UT, Wayne County, UT
The radar
The Cedar City radar (KICX), 162 km from the middle of the area, began a volume at 07:46 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 19, 2:30 AM MDT | FLASH FLOOD | 10 Sse Capitol Reef Np, UT | CAPITOL REEF NATIONAL PARK ESTIMATED PLEASANT CREEK AND SHEETS GULCH HAD 6-8 FEET OF FLOODING OVERNIGHT, AND BURRO, COTTONWOOD, AND 5 MILE WASHES HAD 2 TO 4 FEET OF FLOODING. TIME ESTIMATED FROM RADAR. |
| Aug 19, 2:30 AM MDT | FLASH FLOOD | 2 Sw Capitol Reef Np, UT | CAPITOL REEF NATIONAL PARK REPORTED SCENIC DRIVE WAS CLOSED AT GRAND WASH DUE TO A LARGE AMOUNT OF MUD ACROSS THE ROAD MAKING IT IMPASSIBLE. EXACT TIME OF THE FLASH FLOOD NOT KNOW DUE TO EARLY MORNING HOURS, BUT ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Grand Junction, CO (KGJT), launched 00:00Z, 7.7 hours before the alert went out and 255 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2217 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 251 m²/s²
- 0-3 km storm-relative helicity
- 315 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
905
WGUS55 KSLC 190743
FFWSLC
UTC017-055-191030-
/O.NEW.KSLC.FF.W.0121.210819T0743Z-210819T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
143 AM MDT Thu Aug 19 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
North Central Garfield County in southern Utah...
South Central Wayne County in southern Utah...
* Until 430 AM MDT.
* At 143 AM MDT, Doppler radar indicated thunderstorms producing
heavy rain in and around Capitol Reef National Park. Between 0.25
and 0.5 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...
Sheets Gulch, Capitol Gorge, the Grand Wash, and Pleasant Creek in
Capitol Reef National Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
&&
LAT...LON 3824 11127 3829 11119 3829 11111 3815 11106
3812 11104 3807 11108 3801 11123 3813 11130
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
LC2 follow-up statements
158
WGUS75 KSLC 190916
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
316 AM MDT Thu Aug 19 2021
UTC017-055-191030-
/O.CON.KSLC.FF.W.0121.000000T0000Z-210819T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-Wayne UT-
316 AM MDT Thu Aug 19 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 AM MDT EARLY THIS
MORNING FOR NORTH CENTRAL GARFIELD AND SOUTH CENTRAL WAYNE
COUNTIES...
At 316 AM MDT, Doppler radar indicated thunderstorms producing heavy
rain in and around Capitol Reef National Park. Between 0.5 and 0.75
inches of rain have fallen. Flash flooding is ongoing or expected to
begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Sheets Gulch, Capitol Gorge, the Grand Wash, and Pleasant Creek in
Capitol Reef National Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
&&
LAT...LON 3824 11127 3829 11119 3829 11111 3815 11106
3812 11104 3807 11108 3801 11123 3813 11130
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
LC406
WGUS75 KSLC 191028
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
428 AM MDT Thu Aug 19 2021
UTC017-055-191038-
/O.EXP.KSLC.FF.W.0121.000000T0000Z-210819T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-Wayne UT-
428 AM MDT Thu Aug 19 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 430 AM MDT EARLY THIS MORNING
FOR NORTH CENTRAL GARFIELD AND SOUTH CENTRAL WAYNE COUNTIES...
The heavy rain has ended in and around Capitol Reef National Park.
Flooding is no longer expected to pose an immediate threat. Please
continue to heed any remaining road closures.
A Flash Flood Watch remains in effect until 600 AM MDT for portions
of central Utah, northern Utah and southern Utah.
LAT...LON 3824 11127 3829 11119 3829 11111 3815 11106
3812 11104 3807 11108 3801 11123 3813 11130
$$
LCThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 7:43 PM MDT | Flash Flood Warning | SLC | Kane | 4 hr |
| 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, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.