Alert archive / Utah / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 75, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 17, 2021, 5:00 PM MDT for Davis County, Salt Lake County, Tooele County, Utah. It was in force for 30 min. 4 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
- Aug 17, 2021, 5:00 PM MDT (23:00 UTC)
- Expired
- Aug 17, 2021, 5:30 PM MDT
- In force
- 30 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Davis County, UT, Salt Lake County, UT, Tooele County, UT
The radar
The Salt Lake City radar (KMTX), 42 km from the middle of the area, began a volume at 23:02 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 |
|---|---|---|---|
| Aug 17, 5:19 PM MDT | TSTM WND GST 65 | Ne Lake Pt, UT | THUNDERSTORM WIND GUST MEASURED AT THE MARINA STATION. |
| Aug 17, 5:19 PM MDT | TSTM WND GST 65 | Ne Lake Pt, UT | THUNDERSTORM WIND GUST MEASURED AT THE MARINA STATION. |
| Aug 17, 5:23 PM MDT | TSTM WND GST 68 | 4 Nw Magna, UT | THUNDERSTORM WIND GUST OF 68 MPH MEASURED AT THE CENTER TAILINGS STATION. |
| Aug 17, 5:23 PM MDT | TSTM WND GST 68 | 4 Nw Magna, UT | THUNDERSTORM WIND GUST OF 68 MPH MEASURED AT THE CENTER TAILINGS STATION. |
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 12:00Z, 11.0 hours before the alert went out and 29 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3488 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
299
WUUS55 KSLC 172300
SVRSLC
UTC011-035-045-172330-
/O.NEW.KSLC.SV.W.0075.210817T2300Z-210817T2330Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
500 PM MDT Tue Aug 17 2021
The National Weather Service in Salt Lake City has issued a
* Severe Thunderstorm Warning for...
Northwestern Salt Lake County in northern Utah...
Davis County in northern Utah...
Northeastern Tooele County in northern Utah...
* Until 530 PM MDT
* At 459 PM MDT, a severe thunderstorm was located over Stansbury
Park, or 7 miles north of Tooele, moving northeast at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Salt Lake City, West Valley City, Layton, Bountiful, Farmington,
Grantsville, Hill Air Force Base, Clearfield, Kaysville, Syracuse,
Clinton, North Salt Lake, Centerville, Woods Cross, Stansbury Park,
South Weber, West Bountiful, Uintah, Salt Lake City International
Airport and Magna.
This includes the following highways...
Interstate 15 between mile markers 307 and 337.
Interstate 84 between mile markers 86 and 87.
Interstate 80 in Utah between mile markers 83 and 119.
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.
&&
LAT...LON 4113 11186 4076 11185 4057 11239 4073 11256
4107 11250 4115 11219 4115 11199
TIME...MOT...LOC 2259Z 225DEG 33KT 4064 11230
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MPS1 follow-up statement
102
WWUS55 KSLC 172319
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
519 PM MDT Tue Aug 17 2021
UTC011-035-045-172330-
/O.CON.KSLC.SV.W.0075.000000T0000Z-210817T2330Z/
Salt Lake UT-Davis UT-Tooele UT-
519 PM MDT Tue Aug 17 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MDT
FOR NORTHWESTERN SALT LAKE...DAVIS AND NORTHEASTERN TOOELE
COUNTIES...
At 517 PM MDT, a severe thunderstorm was located near Stansbury Park,
or 10 miles west of West Valley City, moving northeast at 30 mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Radar indicated. At 505 PM a 65 mph wind gust was reported
at the Great Salt Lake Marina.
IMPACT...Hail damage to vehicles is expected. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
Locations impacted include...
Salt Lake City, West Valley City, Layton, Bountiful, Farmington,
Grantsville, Hill Air Force Base, Clearfield, Kaysville, Syracuse,
Clinton, North Salt Lake, Centerville, Woods Cross, Stansbury Park,
South Weber, West Bountiful, Uintah, Salt Lake City International
Airport and Magna.
This includes the following highways...
Interstate 15 between mile markers 307 and 337.
Interstate 84 between mile markers 86 and 87.
Interstate 80 in Utah between mile markers 83 and 119.
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.
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.
&&
LAT...LON 4113 11186 4076 11185 4057 11239 4073 11256
4107 11250 4115 11219 4115 11199
TIME...MOT...LOC 2317Z 227DEG 28KT 4068 11220
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH
$$
MPSThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 1:31 PM MDT | Special Weather Statement | SLC | Kane | 44 min |
| Aug 17, 1:50 PM MDT | Severe Thunderstorm Warning | SLC | Garfield, Kane | 20 min |
| Aug 17, 2:23 PM MDT | Severe Thunderstorm Warning | SLC | Beaver, Garfield, Piute | 52 min |
| Aug 17, 2:50 PM MDT | Flash Flood Warning | SLC | Garfield | 3 hr |
| Aug 17, 3:14 PM MDT | Special Weather Statement | SLC | Juab | 31 min |
| Aug 17, 3:20 PM MDT | Special Weather Statement | SLC | Tooele | 25 min |
| Aug 17, 3:29 PM MDT | Severe Thunderstorm Warning | SLC | Sevier | 46 min |
| Aug 17, 3:51 PM MDT | Severe Thunderstorm Warning | SLC | Tooele | 24 min |
| Aug 17, 4:12 PM MDT | Severe Thunderstorm Warning | SLC | Tooele | 48 min |
| Aug 17, 4:18 PM MDT | Flash Flood Warning | SLC | Emery, Wayne | 3 hr |
| Aug 17, 4:29 PM MDT | Severe Thunderstorm Warning | SLC | Tooele | 46 min |
| Aug 17, 4:39 PM MDT | Severe Thunderstorm Warning | SLC | Millard | 66 min |
| Aug 17, 4:53 PM MDT | Flash Flood Warning | SLC | Garfield | 3 hr |
| Aug 17, 4:56 PM MDT | Severe Thunderstorm Warning | SLC | Garfield | 24 min |
| Aug 17, 5:10 PM MDT | Flash Flood Warning | SLC | Kane | 4 hr |
| Aug 17, 5:12 PM MDT | Severe Thunderstorm Warning | SLC | Tooele | 63 min |
| Aug 17, 5:30 PM MDT | Severe Thunderstorm Warning | SLC | Davis, Salt Lake | 45 min |
| Aug 17, 5:37 PM MDT | Flash Flood Warning | SLC | Garfield, Kane | 6 hr |
| Aug 17, 5:40 PM MDT | Severe Thunderstorm Warning | SLC | Millard | 50 min |
| Aug 17, 5:48 PM MDT | Special Weather Statement | SLC | Sanpete | 27 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.