Alert archive / Utah / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 98, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 2, 2021, 6:29 PM MDT for Davis County, Morgan County, Salt Lake County, Utah. It was in force for 31 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 2, 2021, 6:29 PM MDT (00:29 UTC)
- Expired
- Sep 2, 2021, 7:00 PM MDT
- In force
- 31 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Davis County, UT, Morgan County, UT, Salt Lake County, UT
The radar
The Salt Lake City radar (KMTX), 55 km from the middle of the area, began a volume at 00:31 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 2, 6:31 PM MDT | HAIL 0.75 | Woods Cross, UT | |
| Sep 2, 6:45 PM MDT | HAIL 0.75 | Centerville, UT | TIME ESTIMATED BY RADAR |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Salt Lake City I, UT (KSLC), launched 00:00Z, 0.5 hours before the alert went out and 16 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
- 942 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 2400 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 110 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
The text
As transmitted.
988 WUUS55 KSLC 030029 SVRSLC UTC011-029-035-030100- /O.NEW.KSLC.SV.W.0098.210903T0029Z-210903T0100Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Salt Lake City UT 629 PM MDT Thu Sep 2 2021 The National Weather Service in Salt Lake City has issued a * Severe Thunderstorm Warning for... Northwestern Salt Lake County in northern Utah... Eastern Davis County in northern Utah... West central Morgan County in northern Utah... * Until 700 PM MDT * At 628 PM MDT, a severe thunderstorm was located 7 miles west of West Bountiful, or 10 miles west of Bountiful, moving northeast at 20 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Salt Lake City, Layton, Bountiful, Farmington, Kaysville, North Salt Lake, Centerville, Woods Cross, South Weber, West Bountiful, Salt Lake City International Airport, Great Salt Lake South of the Causeway, Fruit Heights, East Layton and Antelope Island State Park. This includes the following highways... Interstate 15 between mile markers 314 and 332. Interstate 80 in Utah between mile markers 112 and 113. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Large hail and damaging winds and continuous cloud to ground lightning is occurring with this storm. Move indoors immediately. Lightning is one of nature's leading killers. Remember, if you can hear thunder, you are close enough to be struck by lightning. If on or near the Great Salt Lake, get away from the water and move indoors or inside a vehicle. Remember, lightning can strike out to 15 miles from the parent thunderstorm. If you can hear thunder, you are close enough to be struck by lightning. Move to safe shelter now! Do not be caught on the water in a thunderstorm. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4076 11205 4092 11229 4113 11191 4096 11169 TIME...MOT...LOC 0028Z 225DEG 19KT 4089 11206 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ MT
2 follow-up statements
386 WWUS55 KSLC 030046 SVSSLC Severe Weather Statement National Weather Service Salt Lake City UT 646 PM MDT Thu Sep 2 2021 UTC011-029-035-030100- /O.CON.KSLC.SV.W.0098.000000T0000Z-210903T0100Z/ Salt Lake UT-Davis UT-Morgan UT- 646 PM MDT Thu Sep 2 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM MDT FOR NORTHWESTERN SALT LAKE...EASTERN DAVIS AND WEST CENTRAL MORGAN COUNTIES... At 646 PM MDT, a severe thunderstorm was located near West Bountiful, or near Farmington, moving northeast at 20 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Salt Lake City, Layton, Bountiful, Farmington, Kaysville, North Salt Lake, Centerville, Woods Cross, South Weber, West Bountiful, Salt Lake City International Airport, Great Salt Lake South of the Causeway, Fruit Heights, East Layton and Antelope Island State Park. This includes the following highways... Interstate 15 between mile markers 314 and 332. Interstate 80 in Utah between mile markers 112 and 113. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Continuous cloud to ground lightning is occurring with this storm. Move indoors immediately. Lightning is one of nature's leading killers. Remember, if you can hear thunder, you are close enough to be struck by lightning. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4076 11205 4092 11229 4113 11191 4096 11169 TIME...MOT...LOC 0046Z 225DEG 19KT 4096 11197 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ MT
926
WWUS55 KSLC 030057
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
657 PM MDT Thu Sep 2 2021
UTC011-029-035-030105-
/O.EXP.KSLC.SV.W.0098.000000T0000Z-210903T0100Z/
Salt Lake UT-Davis UT-Morgan UT-
657 PM MDT Thu Sep 2 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SALT LAKE...
EASTERN DAVIS AND WEST CENTRAL MORGAN COUNTIES WILL EXPIRE AT 700 PM
MDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However heavy
rain, strong gusty winds to 50 mph, and small hail are still
possible with this thunderstorm, so a Special Weather Statement will
be in effect for this storm until 730 PM MDT.
LAT...LON 4076 11205 4092 11229 4113 11191 4096 11169
TIME...MOT...LOC 0055Z 225DEG 19KT 4099 11193
$$
MTThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 2, 6:13 PM MDT | Special Weather Statement | SLC | Salt Lake | 32 min |
| Sep 2, 6:59 PM MDT | Special Weather Statement | SLC | Morgan | 31 min |
| Sep 2, 7:31 PM MDT | Special Weather Statement | SLC | Summit | 29 min |
| Sep 2, 7:49 PM MDT | Severe Thunderstorm Warning | SLC | Rich, Summit | 26 min |
Nearby
Severe Thunderstorm Warnings in Utah, 2021Every severe thunderstorm 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.