Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 64, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 28, 2021, 3:47 PM MDT for Davis County, 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, 3:47 PM MDT (21:47 UTC)
- Expired
- Jul 28, 2021, 6:45 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Flood severity
- None
Counties Davis County, UT, Morgan County, UT
The radar
The Salt Lake City radar (KMTX), 60 km from the middle of the area, began a volume at 21:52 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, 9.8 hours before the alert went out and 32 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.
442
WGUS55 KSLC 282147
FFWSLC
UTC011-029-290045-
/O.NEW.KSLC.FF.W.0064.210728T2147Z-210729T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
347 PM MDT Wed Jul 28 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
Eastern Davis County in northern Utah...
West Central Morgan County in northern Utah...
* Until 645 PM MDT.
* At 347 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the upper headwaters of Smith Creek and Dalton
Creek. Between 2 and 3 inches of rain have fallen within the last
hour. Flash flooding is ongoing or expected to begin shortly.
Additional heavy rainfall is expected over the Deep Creek drainage.
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...
Morgan, particularly west of Weber River.
This includes the following highways...
Interstate 84 between mile markers 96 and 100.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4101 11182 4102 11182 4107 11183 4111 11179
4112 11178 4113 11177 4109 11173 4104 11170
4097 11176 4100 11180
FLASH FLOOD...RADAR INDICATED
$$
SW1 follow-up statement
108
WGUS75 KSLC 290042
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
642 PM MDT Wed Jul 28 2021
UTC011-029-290052-
/O.EXP.KSLC.FF.W.0064.000000T0000Z-210729T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Davis UT-Morgan UT-
642 PM MDT Wed Jul 28 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 645 PM MDT THIS EVENING FOR
WEST CENTRAL MORGAN COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Runoff from earlier heavy rainfall will continue to diminish
through the evening hours. Please continue to heed any road closures.
LAT...LON 4101 11182 4102 11182 4107 11183 4111 11179
4112 11178 4113 11177 4109 11173 4104 11170
4097 11176 4100 11180
$$
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, 1:55 PM MDT | Flash Flood Warning | SLC | Morgan | 3 hr |
| Jul 28, 2:17 PM MDT | Flash Flood Warning | SLC | Emery | 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.