Alert archive / Utah / Special Weather Statements in 2021

Special Weather Statement, NWS Salt Lake City, UT

October 8, 2021Box Elder County, Utah

NWS Salt Lake City, UT issued this special weather statement at Oct 8, 2021, 3:21 PM MDT for Box Elder County, Utah. It was in force for 54 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
Oct 8, 2021, 3:21 PM MDT (21:21 UTC)
Expired
Oct 8, 2021, 4:15 PM MDT
In force
54 min
Issued by
NWS Salt Lake City, UT
Hail
0.50 in
Wind
55

County Box Elder County, UT

The radar

The Salt Lake City radar (KMTX), 35 km from the middle of the area, began a volume at 21:23 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

Elko, NV (KLKN), launched 12:00Z, 9.4 hours before the alert went out and 140 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, Elko, NV at 12:00Z on 2021-10-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Elko, NV at 12:00Z on 2021-10-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 181 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1023 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
181 m²/s²
0-3 km storm-relative helicity
274 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Salt Lake City, UT wrote its last area forecast discussion before this special weather statement went out at Oct 8, 5:17 AM MDT, 10 hours 4 minutes earlier.

Area forecast discussion, Oct 8, 5:17 AM MDT, 10 hours 4 minutes before
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Hazardous weather outlook, Oct 8, 6:55 AM MDT, 8 hours 26 minutes before
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In the hours before

Local storm report, Oct 8, 10:15 AM MDT, 5 hours 6 minutes before
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Special weather statement, Oct 8, 2:58 PM MDT, 23 minutes before
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Special weather statement, Oct 8, 3:09 PM MDT, 12 minutes before
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Special weather statement, Oct 8, 3:21 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Salt Lake City UT
321 PM MDT Fri Oct 8 2021

UTZ101-103-107-110-082215-
Eastern Box Elder County UT-Wasatch Mountains I-80 North UT-
Cache Valley/Utah Portion UT-Great Salt Lake Desert and Mountains UT-
321 PM MDT Fri Oct 8 2021

...Strong thunderstorms will impact portions of northwestern Cache
and central Box Elder Counties through 415 PM MDT...

At 321 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Holbrook Summit to 16 miles north of Utah
Test and Training Range North. Movement was northeast at 35 mph.

HAZARD...Wind gusts of 50 to 55 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Tremonton, Snowville, Plymouth, Howell, Great Salt Lake North of the
Causeway, Riverside, Great Salt Lake South of the Causeway, Utah Test
and Training Range North, Garland, Portage, Washakie, Promontory,
Penrose, Bothwell, Gunnison Island, Locomotive Springs, Lakeside,
Curlew Junction, Thatcher and Golden Spike Historic Site.

This includes the following highways...
 Interstate 15 between mile markers 380 and 400.
 Interstate 84 between mile markers 0 and 41.
 Utah Route 30 between mile markers 61 and 90.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4110 11251 4121 11354 4200 11312 4200 11203
TIME...MOT...LOC 2121Z 241DEG 40KT 4211 11272 4126 11333

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...55 MPH

CRK

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 7, 6:17 PM MDTSpecial Weather StatementSLCTooele43 min
Oct 7, 7:26 PM MDTSpecial Weather StatementSLCTooele49 min
Oct 7, 9:13 PM MDTSpecial Weather StatementSLCWeber47 min
Oct 8, 2:58 PM MDTSpecial Weather StatementSLCTooele47 min
Oct 8, 3:09 PM MDTSpecial Weather StatementSLC51 min
Oct 8, 3:36 PM MDTSevere Thunderstorm WarningSLCTooele24 min
Oct 8, 3:56 PM MDTSevere Thunderstorm WarningSLCTooele30 min
Oct 8, 4:43 PM MDTSpecial Weather StatementSLC47 min
Oct 8, 5:23 PM MDTSpecial Weather StatementSLC52 min

Nearby

Special Weather Statements in Utah, 2021Every special weather statement 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.