Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 63, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 28, 2021, 2:17 PM MDT for Emery 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, 2:17 PM MDT (20:17 UTC)
- Expired
- Jul 28, 2021, 5:15 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Emery County, UT
The radar
The Cedar City radar (KICX), 227 km from the middle of the area, began a volume at 20:17 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
Grand Junction, CO (KGJT), launched 12:00Z, 8.3 hours before the alert went out and 206 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
- 68 J/kg
- Mixed-layer CIN
- -138 J/kg
- Mixed-layer LCL
- 1671 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -38 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
778
WGUS55 KSLC 282017
FFWSLC
UTC015-282315-
/O.NEW.KSLC.FF.W.0063.210728T2017Z-210728T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
217 PM MDT Wed Jul 28 2021
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
Central Emery County in central Utah...
* Until 515 PM MDT.
* At 217 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1 inch of rain
has fallen across portions of I-70 and Lupacchiotta Canyon.
Additional heavy rainfall is anticipated across Forgotten Canyon
and Eagle Canyon. 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...
mainly rural areas of Central Emery County
This includes the following highways...
Interstate 70 between mile markers 117 and 125.
This includes the following streams and drainages...
Lupacchiotta Canyon, Eagle Canyon, and Forgotten Canyon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3893 11092 3893 11083 3891 11078 3886 11077
3881 11081 3883 11090 3892 11095 3893 11094
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SW1 follow-up statement
120
WGUS75 KSLC 282311
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
511 PM MDT Wed Jul 28 2021
UTC015-282321-
/O.EXP.KSLC.FF.W.0063.000000T0000Z-210728T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emery UT-
511 PM MDT Wed Jul 28 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 515 PM MDT THIS AFTERNOON FOR
CENTRAL EMERY COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Runoff from earlier heavy rainfall will continue to decrease
through the evening hours. Please continue to heed any road closures.
LAT...LON 3893 11092 3893 11083 3891 11078 3886 11077
3881 11081 3883 11090 3892 11095 3893 11094
$$
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, 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.