Alert archive / Utah / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 85, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 18, 2021, 1:24 PM MDT for Juab County, Tooele County, Utah County, Utah. It was in force for 81 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 2021, 1:24 PM MDT (19:24 UTC)
- Expired
- Aug 18, 2021, 2:45 PM MDT
- In force
- 81 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Juab County, UT, Tooele County, UT, Utah County, UT
The radar
The Salt Lake City radar (KMTX), 162 km from the middle of the area, began a volume at 19:26 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 18, 12:14 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Salt Lake City I, UT (KSLC), launched 12:00Z, 7.4 hours before the alert went out and 96 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
- 7 J/kg
- Mixed-layer CIN
- -398 J/kg
- Mixed-layer LCL
- 1192 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
071
WUUS55 KSLC 181924
SVRSLC
UTC023-045-049-182045-
/O.NEW.KSLC.SV.W.0085.210818T1924Z-210818T2045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
124 PM MDT Wed Aug 18 2021
The National Weather Service in Salt Lake City has issued a
* Severe Thunderstorm Warning for...
Northeastern Juab County in central Utah...
Utah County in northern Utah...
Southeastern Tooele County in northern Utah...
* Until 245 PM MDT
* At 124 PM MDT, severe thunderstorms were located along a line
extending from 11 miles east of Vernon to 10 miles west of Nephi,
moving northeast at 35 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...
Provo, Payson, Nephi, Orem, Lehi, Spanish Fork, Pleasant Grove,
Springville, American Fork, Eagle Mountain, Lindon, Alpine,
Santaquin, Mapleton, Salem, Elk Ridge, Woodland Hills, Rocky Ridge,
Vineyard and Brigham Young University.
This includes the following highways...
Interstate 15 between mile markers 217 and 283.
US Route 6 between mile markers 118 and 195.
US Route 89 between mile markers 297 and 312.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3984 11125 3981 11137 3981 11164 3978 11162
3978 11158 3974 11159 3972 11171 3964 11178
3956 11222 4013 11241 4054 11166 4046 11161
4044 11162
TIME...MOT...LOC 1924Z 234DEG 32KT 4006 11224 3968 11202
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Church4 follow-up statements
340
WWUS55 KSLC 181946
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
146 PM MDT Wed Aug 18 2021
UTC045-181955-
/O.CAN.KSLC.SV.W.0085.000000T0000Z-210818T2045Z/
Tooele UT-
146 PM MDT Wed Aug 18 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN TOOELE COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A severe thunderstorm watch remains in effect until 800 PM MDT for
central and northern Utah.
LAT...LON 3981 11137 3981 11164 3978 11162 3978 11158
3974 11159 3961 11214 4002 11217 4021 11215
4025 11218 4054 11166 4046 11161 4044 11162
3984 11125
TIME...MOT...LOC 1945Z 234DEG 32KT 4016 11206 3978 11184
$$
UTC023-049-182045-
/O.CON.KSLC.SV.W.0085.000000T0000Z-210818T2045Z/
Juab UT-Utah UT-
146 PM MDT Wed Aug 18 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM MDT
FOR NORTHEASTERN JUAB AND UTAH COUNTIES...
At 145 PM MDT, severe thunderstorms were located along a line
extending from 10 miles south of Eagle Mountain to near Nephi, moving
northeast at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Provo, Payson, Nephi, Orem, Lehi, Spanish Fork, Pleasant Grove,
Springville, American Fork, Eagle Mountain, Lindon, Alpine,
Santaquin, Mapleton, Salem, Elk Ridge, Woodland Hills, Rocky Ridge,
Vineyard and Brigham Young University.
This includes the following highways...
Interstate 15 between mile markers 223 and 282.
US Route 6 between mile markers 127 and 195.
US Route 89 between mile markers 297 and 312.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3981 11137 3981 11164 3978 11162 3978 11158
3974 11159 3961 11214 4002 11217 4021 11215
4025 11218 4054 11166 4046 11161 4044 11162
3984 11125
TIME...MOT...LOC 1945Z 234DEG 32KT 4016 11206 3978 11184
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Church612
WWUS55 KSLC 182005
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
205 PM MDT Wed Aug 18 2021
UTC023-049-182045-
/O.CON.KSLC.SV.W.0085.000000T0000Z-210818T2045Z/
Juab UT-Utah UT-
205 PM MDT Wed Aug 18 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM MDT
FOR EAST CENTRAL JUAB AND CENTRAL UTAH COUNTIES...
At 205 PM MDT, severe thunderstorms were located along a line
extending from 6 miles northwest of Utah Lake to 9 miles southeast of
Rocky Ridge, moving east at 35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Provo, Payson, Nephi, Orem, Lehi, Spanish Fork, Pleasant Grove,
Springville, American Fork, Eagle Mountain, Lindon, Alpine,
Santaquin, Mapleton, Salem, Elk Ridge, Woodland Hills, Rocky Ridge,
Vineyard and Brigham Young University.
This includes the following highways...
Interstate 15 between mile markers 224 and 283.
US Route 6 between mile markers 150 and 195.
US Route 89 between mile markers 297 and 312.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3962 11211 4001 11193 4037 11197 4054 11166
4046 11161 4044 11162 3986 11126 3981 11143
3981 11164 3978 11162 3978 11158 3974 11159
TIME...MOT...LOC 2005Z 270DEG 32KT 4024 11188 3986 11166
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Church874
WWUS55 KSLC 182030
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
230 PM MDT Wed Aug 18 2021
UTC023-049-182045-
/O.CON.KSLC.SV.W.0085.000000T0000Z-210818T2045Z/
Juab UT-Utah UT-
230 PM MDT Wed Aug 18 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM MDT
FOR EAST CENTRAL JUAB AND SOUTHWESTERN UTAH COUNTIES...
At 229 PM MDT, severe thunderstorms were located along a line
extending from near Lindon to 10 miles east of Woodland Hills, moving
northeast at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Provo, Payson, Nephi, Spanish Fork, Springville, Santaquin, Mapleton,
Salem, Elk Ridge, Woodland Hills, Rocky Ridge, Benjamin, Palmyra,
Lake Shore, Spring Lake, West Mountain, Elberta, Utah Lake, Mona and
Genola.
This includes the following highways...
Interstate 15 between mile markers 224 and 263.
US Route 6 between mile markers 150 and 195.
US Route 89 between mile markers 297 and 312.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3962 11211 4001 11193 4030 11153 3986 11126
3981 11143 3981 11164 3978 11162 3978 11158
3974 11159
TIME...MOT...LOC 2029Z 234DEG 32KT 4036 11167 3998 11145
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Church441
WWUS55 KSLC 182038
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
238 PM MDT Wed Aug 18 2021
UTC023-049-182047-
/O.EXP.KSLC.SV.W.0085.000000T0000Z-210818T2045Z/
Juab UT-Utah UT-
238 PM MDT Wed Aug 18 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL JUAB AND
SOUTHWESTERN UTAH COUNTIES WILL EXPIRE AT 245 PM MDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However heavy rain
is still possible with these thunderstorms.
A severe thunderstorm watch remains in effect until 800 PM MDT for
central and northern Utah.
LAT...LON 3962 11211 4001 11193 4030 11153 3986 11126
3981 11143 3981 11164 3978 11162 3978 11158
3974 11159
TIME...MOT...LOC 2037Z 234DEG 32KT 4039 11162 4001 11140
$$
ChurchThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 6:05 PM MDT | Flash Flood Warning | SLC | Millard | 3 hr |
| Aug 17, 6:10 PM MDT | Severe Thunderstorm Warning | SLC | Juab | 35 min |
| Aug 17, 6:31 PM MDT | Severe Thunderstorm Warning | SLC | Millard | 59 min |
| Aug 17, 6:39 PM MDT | Special Weather Statement | SLC | Utah | 36 min |
| Aug 17, 6:49 PM MDT | Severe Thunderstorm Warning | SLC | Utah, Wasatch | 26 min |
| Aug 17, 6:57 PM MDT | Flash Flood Warning | SLC | Kane, San Juan | 5 hr |
| Aug 17, 7:14 PM MDT | Severe Thunderstorm Warning | SLC | Summit, Wasatch | 31 min |
| Aug 17, 8:52 PM MDT | Special Weather Statement | SLC | Salt Lake | 38 min |
| Aug 17, 9:30 PM MDT | Special Weather Statement | SLC | Tooele | 30 min |
| Aug 17, 9:55 PM MDT | Special Weather Statement | SLC | Kane | 35 min |
| Aug 17, 9:58 PM MDT | Special Weather Statement | SLC | Juab | 32 min |
| Aug 17, 10:00 PM MDT | Special Weather Statement | SLC | Juab | 30 min |
| Aug 17, 10:17 PM MDT | Special Weather Statement | SLC | Salt Lake | 28 min |
| Aug 18, 12:23 AM MDT | Special Weather Statement | SLC | 52 min | |
| Aug 18, 12:31 AM MDT | Special Weather Statement | SLC | Millard | 44 min |
| Aug 18, 12:45 AM MDT | Special Weather Statement | SLC | Juab | 45 min |
| Aug 18, 1:42 AM MDT | Special Weather Statement | SLC | Juab | 48 min |
| Aug 18, 4:38 AM MDT | Flash Flood Warning | SLC | Iron | 5 hr |
| Aug 18, 4:41 AM MDT | Flash Flood Warning | SLC | Iron | 3 hr |
| Aug 18, 6:02 AM MDT | Flash Flood Warning | SLC | Iron, Washington | 4 hr |
| Aug 18, 7:30 AM MDT | Flash Flood Warning | SLC | Kane, Washington | 90 min |
| Aug 18, 7:55 AM MDT | Areal Flood Warning | SLC | Garfield, Iron, Kane, Washington | 6 hr |
| Aug 18, 8:58 AM MDT | Flash Flood Warning | SLC | Kane, Washington | 92 min |
| Aug 18, 11:05 AM MDT | Severe Thunderstorm Warning | SLC | Tooele | 40 min |
| Aug 18, 11:45 AM MDT | Special Weather Statement | SLC | Salt Lake | 45 min |
| Aug 18, 12:11 PM MDT | Flash Flood Warning | SLC | Garfield, Wayne | 6 hr |
| Aug 18, 12:17 PM MDT | Areal Flood Advisory | SLC | Davis, Salt Lake, Tooele | 2 hr |
| Aug 18, 12:29 PM MDT | Special Weather Statement | SLC | 31 min | |
| Aug 18, 12:34 PM MDT | Severe Thunderstorm Warning | SLC | Juab, Tooele | 56 min |
| Aug 18, 12:47 PM MDT | Special Weather Statement | SLC | Piute | 28 min |
| Aug 18, 1:05 PM MDT | Flash Flood Warning | SLC | Wayne | 3 hr |
| Aug 18, 1:12 PM MDT | Flash Flood Warning | SLC | Garfield | 2 hr |
| Aug 18, 1:14 PM MDT | Special Weather Statement | SLC | Beaver | 31 min |
| Aug 18, 1:24 PM MDT | Areal Flood Warning | SLC | Juab, Salt Lake, Tooele, Utah | 3 hr |
| Aug 18, 1:39 PM MDT | Flash Flood Warning | SLC | Kane, Washington | 3 hr |
| Aug 18, 1:57 PM MDT | Areal Flood Advisory | SLC | Salt Lake, Utah | 2 hr |
| Aug 18, 2:27 PM MDT | Flash Flood Warning | SLC | Utah | 3 hr |
| Aug 18, 2:37 PM MDT | Flash Flood Warning | SLC | Utah | 113 min |
| Aug 18, 2:51 PM MDT | Special Weather Statement | SLC | Summit | 24 min |
| Aug 18, 2:56 PM MDT | Special Weather Statement | SLC | Garfield | 49 min |
| Aug 18, 3:14 PM MDT | Special Weather Statement | SLC | Kane | 46 min |
| Aug 18, 3:18 PM MDT | Special Weather Statement | SLC | Wasatch | 27 min |
| Aug 18, 3:25 PM MDT | Flash Flood Warning | SLC | Utah | 3 hr |
| Aug 18, 3:41 PM MDT | Special Weather Statement | SLC | Sanpete | 49 min |
| Aug 18, 3:46 PM MDT | Flash Flood Warning | SLC | Emery, Wayne | 3 hr |
| Aug 18, 4:16 PM MDT | Special Weather Statement | SLC | Kane | 44 min |
| Aug 18, 4:22 PM MDT | Flash Flood Warning | SLC | Garfield | 3 hr |
| Aug 18, 5:41 PM MDT | Special Weather Statement | SLC | 49 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.