Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 11, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 14, 2021, 7:07 PM MDT for Kane County, Washington 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 14, 2021, 7:07 PM MDT (01:07 UTC)
- Expired
- Jul 14, 2021, 10:15 PM MDT
- In force
- 3 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), 35 km from the middle of the area, began a volume at 01:06 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, 1.1 hours before the alert went out and 250 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
- 22 J/kg
- Mixed-layer CIN
- -222 J/kg
- Mixed-layer LCL
- 1650 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- -21 m²/s²
- 0-3 km storm-relative helicity
- 2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
266
WGUS55 KSLC 150107
FFWSLC
UTC025-053-150415-
/O.NEW.KSLC.FF.W.0011.210715T0107Z-210715T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
707 PM MDT Wed Jul 14 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
West Central Kane County in southern Utah...
East Central Washington County in southwestern Utah...
* Until 1015 PM MDT.
* At 707 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain in Zion National Park. Between 0.5 and 1 inch of rain
has fallen. Additional rainfall amounts of 0.5 to 1 inch are
possible in the warned area. 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...
Zion National Park, Springdale and Rockville.
This includes the following streams and drainages...
North Fork Virgin River and Orderville Canyon including the
Narrows, Mystery Canyon, and Imlay Canyon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
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 3737 11298 3737 11290 3727 11290 3726 11287
3716 11286 3716 11302 3728 11297
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
LC2 follow-up statements
277
WGUS75 KSLC 150255
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
855 PM MDT Wed Jul 14 2021
UTC025-053-150415-
/O.CON.KSLC.FF.W.0011.000000T0000Z-210715T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-Washington UT-
855 PM MDT Wed Jul 14 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 PM MDT THIS
EVENING FOR WEST CENTRAL KANE AND EAST CENTRAL WASHINGTON COUNTIES...
At 855 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain in Zion National Park. Between 0.5 and 1 inch of rain has
fallen. Additional rainfall amounts of 0.25 to 0.5 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Zion National Park, Springdale and Rockville.
This includes the following streams and drainages...
North Fork Virgin River and Orderville Canyon including the
Narrows, Mystery Canyon, and Imlay Canyon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for flooding even in locations not receiving rain. Dry
washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
&&
LAT...LON 3737 11298 3737 11290 3727 11290 3726 11287
3716 11286 3716 11302 3728 11297
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
LC211
WGUS75 KSLC 150413
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
1013 PM MDT Wed Jul 14 2021
UTC025-053-150423-
/O.EXP.KSLC.FF.W.0011.000000T0000Z-210715T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-Washington UT-
1013 PM MDT Wed Jul 14 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 1015 PM MDT THIS EVENING FOR
WEST CENTRAL KANE AND EAST CENTRAL WASHINGTON COUNTIES...
Heavy rain has ended in Zion National Park. Flooding is no longer
expected to pose a threat. However, runoff from earlier heavy rain
will gradually decrease as light rain diminishes later this evening.
Please continue to heed any road closures.
LAT...LON 3737 11298 3737 11290 3727 11290 3726 11287
3716 11286 3716 11302 3728 11297
$$
LCThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 6:20 PM MDT | Special Weather Statement | SLC | Emery | 40 min |
| Jul 14, 6:25 PM MDT | Severe Thunderstorm Warning | SLC | Iron, Washington | 50 min |
| Jul 14, 6:49 PM MDT | Special Weather Statement | SLC | Iron | 41 min |
| Jul 14, 7:53 PM MDT | Severe Thunderstorm Warning | SLC | Washington | 69 min |
| Jul 15, 2:53 AM MDT | Flash Flood Watch | SLC | Beaver, Emery, Garfield, Iron, Kane, Piute and 4 more | 25 hr |
| Jul 15, 4:43 PM MDT | Special Weather Statement | SLC | Carbon | 47 min |
| Jul 15, 5:01 PM MDT | Special Weather Statement | SLC | Garfield | 44 min |
| Jul 15, 5:03 PM MDT | Special Weather Statement | SLC | Tooele | 57 min |
| Jul 15, 5:29 PM MDT | Special Weather Statement | SLC | Weber | 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.