Alert archive / Wyoming / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 41, NWS Rapid City, SD

June 12, 2017Campbell County, Wyoming

NWS Rapid City, SD issued this severe thunderstorm warning at Jun 12, 2017, 4:51 PM MDT for Campbell County, Wyoming. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 12, 2017, 4:51 PM MDT (22:51 UTC)
Expired
Jun 12, 2017, 5:34 PM MDT
In force
43 min
Issued by
NWS Rapid City, SD
Area
Storm-based polygon
Hail
1.5 in
Wind
60.0 mph

County Campbell County, WY

The radar

The Rapid City radar (KUDX), 217 km from the middle of the area, began a volume at 22:53 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

Rapid City, SD (KRAP), launched 12:00Z, 10.9 hours before the alert went out and 214 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, Rapid City, SD at 12:00Z on 2017-06-12Temperature 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 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 12:00Z on 2017-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 168 square meters per square second.193958Sfc1 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
2300 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
168 m²/s²
0-3 km storm-relative helicity
427 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Rapid City, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 12, 1:40 PM MDT, 3 hours 11 minutes earlier.

Area forecast discussion, Jun 12, 1:40 PM MDT, 3 hours 11 minutes before
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Hazardous weather outlook, Jun 12, 5:24 AM MDT, 11 hours 27 minutes before
Hazardous Weather Outlook
National Weather Service Rapid City SD
524 AM MDT Mon Jun 12 2017

SDZ012>014-024>032-041>044-046-047-072>074-WYZ054>058-071-131300-
Butte-Northern Meade Co Plains-Ziebach-Northern Black Hills-
Northern Foot Hills-Rapid City-Southern Foot Hills-
Central Black Hills-Southern Black Hills-Custer Co Plains-
Pennington Co Plains-Haakon-Fall River-Oglala Lakota-Jackson-
Bennett-Mellette-Todd-Sturgis/Piedmont Foot Hills-
Southern Meade Co Plains-Hermosa Foot Hills-Northern Campbell-
Southern Campbell-Western Crook-Wyoming Black Hills-Weston-
Northeastern Crook-
524 AM MDT Mon Jun 12 2017 /624 AM CDT Mon Jun 12 2017/

This Hazardous weather outlook is for portions of south central
South Dakota...the Black Hills of South Dakota...western South
Dakota...northeast Wyoming...and the Black Hills of Wyoming.

.DAY ONE...Today and Tonight

An unseasonably strong storm system will affect the area this
afternoon and tonight. There is a moderate risk of severe
thunderstorms over far southwestern South Dakota and parts of
northeastern Wyoming, with an enhanced risk of severe storms
elsewhere. All threats are possible, including very large hail,
damaging winds, and a few tornadoes. The best chance for tornadoes
will be over northeastern Wyoming and far southwestern South
Dakota. In addition, locally heavy rainfall also is possible with
this system.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

There will be slight chances of thunderstorms periodically
throughout the rest of the week, but organized severe weather is
not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be needed today, mainly for southwestern
parts of the area.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

SDZ001-002-049-131300-
Harding-Perkins-Tripp-
524 AM MDT Mon Jun 12 2017 /624 AM CDT Mon Jun 12 2017/

This Hazardous weather outlook is for portions of south central
South Dakota...and western South Dakota.

.DAY ONE...Today and Tonight

An unseasonably strong storm system will affect the area this
evening and overnight. There is a slight risk of severe
thunderstorms. The main threats are large hail and damaging In
addition, locally heavy rainfall also is possible with this
system.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

There will be slight chances of thunderstorms periodically
throughout the rest of the week, but organized severe weather is
not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed today.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

Bunkers

The office that day

Everything else NWS Rapid City, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 11, 8:43 PM MDTSpecial Weather StatementUNR62 min
Jun 11, 10:21 PM MDTSpecial Weather StatementUNR24 min
Jun 11, 11:43 PM MDTSpecial Weather StatementUNRLawrence62 min
Jun 12, 2:46 AM MDTSpecial Weather StatementUNRLawrence44 min
Jun 12, 4:36 AM MDTSpecial Weather StatementUNRTripp39 min
Jun 11, 9:22 PM MDTSpecial Weather StatementUNRWeston38 min
Jun 11, 9:46 PM MDTSpecial Weather StatementUNRCampbell44 min
Jun 11, 10:07 PM MDTSpecial Weather StatementUNRWeston38 min
Jun 11, 10:46 PM MDTSpecial Weather StatementUNRWeston29 min
Jun 11, 10:48 PM MDTSpecial Weather StatementUNRWeston27 min
Jun 11, 10:53 PM MDTSevere Thunderstorm WarningUNRCampbell, Weston39 min
Jun 12, 12:27 AM MDTSpecial Weather StatementUNRWeston48 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2017Every severe thunderstorm warning in 2017

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.