Alert archive / Utah / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 2, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at May 31, 2018, 2:32 PM MDT for Box Elder County, Utah. It was in force for 58 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 31, 2018, 2:32 PM MDT (20:32 UTC)
- Expired
- May 31, 2018, 3:30 PM MDT
- In force
- 58 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
County Box Elder County, UT
The radar
The Salt Lake City radar (KMTX), 124 km from the middle of the area, began a volume at 20:34 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, 8.5 hours before the alert went out and 109 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
- 16 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 1320 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
165
WUUS55 KSLC 312032
SVRSLC
UTC003-312130-
/O.NEW.KSLC.SV.W.0002.180531T2032Z-180531T2130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
232 PM MDT THU MAY 31 2018
The National Weather Service in Salt Lake City has issued a
* Severe Thunderstorm Warning for...
Northwestern Box Elder County in northern Utah...
* Until 330 PM MDT
* At 231 PM MDT, a severe thunderstorm was located 26 miles north of
Montello, moving northeast at 30 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Lynn, Etna, Yost and Grouse Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4188 11338 4150 11404 4151 11405 4180 11404
4199 11386 4199 11355
TIME...MOT...LOC 2031Z 224DEG 26KT 4163 11405
HAIL...1.25IN
WIND...60MPH
$$
ES2 follow-up statements
299
WWUS55 KSLC 312104
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
304 PM MDT THU MAY 31 2018
UTC003-312130-
/O.CON.KSLC.SV.W.0002.000000T0000Z-180531T2130Z/
Box Elder UT-
304 PM MDT THU MAY 31 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM MDT
FOR NORTHWESTERN BOX ELDER COUNTY...
At 303 PM MDT, a severe thunderstorm was located 24 miles south of
Oakley Reservoir, moving northeast at 30 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Yost, Lynn and Grouse Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4166 11387 4172 11404 4180 11404 4199 11386
4199 11355 4197 11351
TIME...MOT...LOC 2103Z 209DEG 26KT 4182 11392
HAIL...1.25IN
WIND...60MPH
$$
ES466
WWUS55 KSLC 312128
SVSSLC
Severe Weather Statement
National Weather Service Salt Lake City UT
328 PM MDT THU MAY 31 2018
UTC003-312137-
/O.EXP.KSLC.SV.W.0002.000000T0000Z-180531T2130Z/
Box Elder UT-
328 PM MDT THU MAY 31 2018
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BOX ELDER COUNTY
WILL EXPIRE AT 330 PM MDT...
The storm which prompted the warning has weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.
LAT...LON 4166 11387 4172 11404 4180 11404 4199 11386
4199 11355 4197 11351
TIME...MOT...LOC 2127Z 224DEG 26KT 4182 11392
$$
ESThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 6:35 PM MDT | Special Weather Statement | SLC | Cache | 40 min |
| May 30, 7:06 PM MDT | Special Weather Statement | SLC | Cache | 54 min |
| May 30, 8:55 PM MDT | Special Weather Statement | SLC | Morgan | 35 min |
| May 30, 8:57 PM MDT | Special Weather Statement | SLC | Salt Lake | 33 min |
| May 30, 9:37 PM MDT | Special Weather Statement | SLC | Morgan | 23 min |
| May 31, 4:21 PM MDT | Severe Thunderstorm Warning | SLC | Box Elder | 24 min |
Nearby
Severe Thunderstorm Warnings in Utah, 2018Every severe thunderstorm warning in 2018
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.