Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 62, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 28, 2021, 1:55 PM MDT for Morgan 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 28, 2021, 1:55 PM MDT (19:55 UTC)
- Expired
- Jul 28, 2021, 4:45 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Flood severity
- None
County Morgan County, UT
The radar
The Salt Lake City radar (KMTX), 87 km from the middle of the area, began a volume at 19:57 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
Salt Lake City I, UT (KSLC), launched 12:00Z, 7.9 hours before the alert went out and 64 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
- 104 J/kg
- Mixed-layer CIN
- -191 J/kg
- Mixed-layer LCL
- 2082 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
666
WGUS55 KSLC 281955
FFWSLC
UTC029-282245-
/O.NEW.KSLC.FF.W.0062.210728T1955Z-210728T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
155 PM MDT Wed Jul 28 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
Northeastern Morgan County in northern Utah...
* Until 445 PM MDT.
* At 155 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across headwaters of the Lost Creek watershed. Between
2 and 3.25 inches of rain have fallen within the last hour. Flash
flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
mainly rural areas of Northeastern Morgan County
This includes the following streams and drainages...
Lost Creek through the intersection with North Lost Creek Road.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4129 11142 4129 11141 4128 11137 4126 11133
4121 11136 4120 11137 4115 11139 4111 11147
4112 11150 4124 11148 4125 11145
FLASH FLOOD...RADAR INDICATED
$$
SW1 follow-up statement
069
WGUS75 KSLC 282249
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
449 PM MDT Wed Jul 28 2021
UTC029-282259-
/O.EXP.KSLC.FF.W.0062.000000T0000Z-210728T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morgan UT-
449 PM MDT Wed Jul 28 2021
...FLASH FLOOD WARNING HAS EXPIRED FOR NORTHEASTERN MORGAN COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. runoff from earlier heavy rainfall will continue to decrease
through the evening hours. Please continue to heed any road closures.
LAT...LON 4129 11142 4129 11141 4128 11137 4126 11133
4121 11136 4120 11137 4115 11139 4111 11147
4112 11150 4124 11148 4125 11145
$$
SWThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 11:57 AM MDT | Special Weather Statement | SLC | Cache | 48 min |
| Jul 28, 12:19 PM MDT | Flash Flood Warning | SLC | Cache | 3 hr |
| Jul 28, 2:17 PM MDT | Flash Flood Warning | SLC | Emery | 3 hr |
| Jul 28, 3:47 PM MDT | Flash Flood Warning | SLC | Davis, Morgan | 3 hr |
| Jul 28, 3:50 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 25 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.