Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 20, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 19, 2021, 3:04 PM MDT for Iron 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 19, 2021, 3:04 PM MDT (21:04 UTC)
- Expired
- Jul 19, 2021, 6:00 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Iron County, UT
The radar
The Cedar City radar (KICX), 47 km from the middle of the area, began a volume at 21:03 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
Las Vegas, NV (KVEF), launched 12:00Z, 9.1 hours before the alert went out and 234 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
- 127 J/kg
- Mixed-layer CIN
- -232 J/kg
- Mixed-layer LCL
- 1964 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
796
WGUS55 KSLC 192104
FFWSLC
UTC021-200000-
/O.NEW.KSLC.FF.W.0020.210719T2104Z-210720T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
304 PM MDT Mon Jul 19 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
Southwestern Iron County in southern Utah...
* Until 600 PM MDT.
* At 304 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1.5 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...
Portions of SR-56 between Cedar City and Old Irontown
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3758 11341 3759 11343 3761 11345 3762 11345
3763 11342 3762 11341 3762 11335 3760 11335
3757 11336 3758 11337
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SW2 follow-up statements
921
WGUS75 KSLC 192228
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
428 PM MDT Mon Jul 19 2021
UTC021-200000-
/O.CON.KSLC.FF.W.0020.000000T0000Z-210720T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Iron UT-
428 PM MDT Mon Jul 19 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING
FOR SOUTHWESTERN IRON COUNTY...
At 428 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 2.5 and 3.5 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly
within the warned area. Flash flooding has been reported nearby.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
mainly rural areas of Southwestern Iron County
This includes the following highways...
Utah Route 56 between mile markers 40 and 44.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3758 11341 3759 11343 3761 11345 3762 11345
3763 11342 3762 11341 3762 11335 3760 11335
3757 11336 3758 11337
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SW823
WGUS75 KSLC 200002
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
602 PM MDT Mon Jul 19 2021
UTC021-200012-
/O.EXP.KSLC.FF.W.0020.000000T0000Z-210720T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Iron UT-
602 PM MDT Mon Jul 19 2021
...FLASH FLOOD WARNING HAS EXPIRED FOR SOUTHWESTERN IRON COUNTY...
The heavy rain has decreased across the warned area. Flooding is no
longer expected to pose a threat. Additional moderate to heavy
rainfall is anticipated over the next 1 to 2 hours. 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 3758 11341 3759 11343 3761 11345 3762 11345
3763 11342 3762 11341 3762 11335 3760 11335
3757 11336 3758 11337
$$
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, 1:44 PM MDT | Flash Flood Warning | SLC | Kane, Washington | 5 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, 3:22 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.