Alert archive / Utah / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 6, NWS Salt Lake City, UT

May 16, 2021Tooele County, Utah

NWS Salt Lake City, UT issued this severe thunderstorm warning at May 16, 2021, 3:24 PM MDT for Tooele County, Utah. It was in force for 51 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
May 16, 2021, 3:24 PM MDT (21:24 UTC)
Expired
May 16, 2021, 4:15 PM MDT
In force
51 min
Issued by
NWS Salt Lake City, UT
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Tooele County, UT

The radar

The Salt Lake City radar (KMTX), 71 km from the middle of the area, began a volume at 21:25 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, 9.4 hours before the alert went out and 74 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.

Skew-T log-pSkew-T log-p diagram, Salt Lake City I, UT at 12:00Z on 2021-05-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 528 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salt Lake City I, UT at 12:00Z on 2021-05-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
528 J/kg
Mixed-layer CIN
-208 J/kg
Mixed-layer LCL
1618 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
51 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted.

966 
WUUS55 KSLC 162124
SVRSLC
UTC045-162215-
/O.NEW.KSLC.SV.W.0006.210516T2124Z-210516T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
324 PM MDT Sun May 16 2021

The National Weather Service in Salt Lake City has issued a

* Severe Thunderstorm Warning for...
  North central Tooele County in northern Utah...

* Until 415 PM MDT

* At 324 PM MDT, a severe thunderstorm was located 9 miles north of
  Skull Valley, or 15 miles west of Grantsville, moving northwest at
  15 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...
  Delle and Skull Valley. 

This includes Interstate 80 in Utah between mile markers 51 and 59,
and between mile markers 63 and 74.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4060 11262 4052 11276 4074 11309 4088 11276
TIME...MOT...LOC 2124Z 150DEG 12KT 4061 11276 

HAIL...1.00IN
WIND...60MPH
 
$$

Webber
2 follow-up statements
452 
WWUS55 KSLC 162146
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
346 PM MDT Sun May 16 2021

UTC045-162215-
/O.CON.KSLC.SV.W.0006.000000T0000Z-210516T2215Z/
Tooele UT-
346 PM MDT Sun May 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM MDT
FOR NORTH CENTRAL TOOELE COUNTY...

At 346 PM MDT, a severe thunderstorm was located 7 miles south of
Delle, or 19 miles west of Grantsville, moving northwest at 15 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...
Delle.

This includes Interstate 80 in Utah between mile markers 51 and 59,
and between mile markers 63 and 73.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4064 11267 4057 11284 4074 11309 4088 11276
TIME...MOT...LOC 2146Z 144DEG 13KT 4067 11283 

HAIL...1.00IN
WIND...60MPH
 
$$

Webber
437 
WWUS55 KSLC 162221
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
421 PM MDT Sun May 16 2021

UTC045-162231-
/O.EXP.KSLC.SV.W.0006.000000T0000Z-210516T2215Z/
Tooele UT-
421 PM MDT Sun May 16 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL TOOELE COUNTY
HAS EXPIRED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been allowed to expire.

LAT...LON 4064 11267 4057 11284 4074 11309 4088 11276
TIME...MOT...LOC 2221Z 150DEG 12KT 4076 11290 

$$

Webber

The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 15, 6:30 PM MDTSpecial Weather StatementSLC45 min
May 16, 1:07 PM MDTSpecial Weather StatementSLCSalt Lake38 min
May 16, 1:22 PM MDTSevere Thunderstorm WarningSLCDavis, Salt Lake, Tooele23 min
May 16, 1:52 PM MDTSpecial Weather StatementSLCDavis38 min
May 16, 1:55 PM MDTSpecial Weather StatementSLCSalt Lake35 min
May 16, 1:58 PM MDTSpecial Weather StatementSLCWeber47 min
May 16, 2:03 PM MDTSevere Thunderstorm WarningSLCMorgan, Weber27 min
May 16, 2:07 PM MDTSpecial Weather StatementSLC38 min
May 16, 2:20 PM MDTSpecial Weather StatementSLCSalt Lake40 min
May 16, 2:29 PM MDTSevere Thunderstorm WarningSLCBox Elder, Weber31 min
May 16, 2:31 PM MDTSpecial Weather StatementSLCDavis44 min
May 16, 2:50 PM MDTSpecial Weather StatementSLC55 min
May 16, 3:00 PM MDTSevere Thunderstorm WarningSLCBox Elder, Weber30 min
May 16, 3:04 PM MDTSpecial Weather StatementSLCTooele41 min
May 16, 3:30 PM MDTSpecial Weather StatementSLCCache45 min
May 16, 3:32 PM MDTSpecial Weather StatementSLCWeber43 min
May 16, 4:15 PM MDTSpecial Weather StatementSLCBox Elder45 min
May 16, 4:19 PM MDTSpecial Weather StatementSLCBox Elder41 min
May 16, 4:39 PM MDTSpecial Weather StatementSLCBox Elder51 min
May 16, 5:07 PM MDTSpecial Weather StatementSLCBox Elder53 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.