Alert archive / Wyoming / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 7, NWS Rapid City, SD

May 7, 2018Campbell County, Wyoming

NWS Rapid City, SD issued this severe thunderstorm warning at May 7, 2018, 6:56 PM MDT for Campbell County, Wyoming. It was in force for 13 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: May 7, 2018, 6:56 PM MDT (00:56 UTC)
Expired: May 7, 2018, 7:09 PM MDT
In force: 13 min
Issued by: NWS Rapid City, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Campbell County, WY

The radar

The Rapid City radar (KUDX), 217 km from the middle of the area, began a volume at 00:59 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.

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 May 7, 5:25 PM MDT, 1 hour 31 minutes earlier.

Area forecast discussion, May 7, 5:25 PM MDT, 1 hour 31 minutes before

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
525 PM MDT Mon May 7 2018

.DISCUSSION...(This Evening Through Monday)
Issued at 220 PM MDT Mon May 7 2018

Latest upper level analysis shows the ridge axis over the
northern plains with a shortwave trough pushing into eastern
Montana. At the surface, a trough extends through western South
Dakota into eastern Wyoming. Temperatures are currently in the 70s
and 80s.

The shortwave trough over Montana will move into the area over the
next few hours. Low level moisture continues to increase, but is
limited as dew points are only in the 40s. However, the moisture is
still sufficient, especially when combined with surface heating,
deep mixing, and very steep mid-level lapse rates supporting CAPE of
250-1000 J/kg through the early evening. Shear profiles indicate
that the severe threat looks marginal at this time, with gusty winds
due to inverted-v profiles and small to moderate sized hail being
the main threats. The severe potential should weaken by late evening
given decreasing instability and increasing inhibition as the storms
move east.

Chances for showers and thunderstorms will once again be possible on
Tuesday with unstable cyclonic flow overhead, sufficient low level
moisture and daytime heating. For Wednesday, the upper ridge begins
to flatten and move east as a long wave trough begins to move into
the western CONUS. This would mean Wednesday would be the last of
the warm days until next week. A cold front will back into the
region Thursday into Friday, which would mean cooler temperatures
and increasing chances for precipitation. The western longwave
trough and associated cold front will push through this weekend,
keeping the cool and unsettled conditions in place. In addition to
the below average temperatures, windy conditions are expected for
Saturday and Sunday.

&&

.AVIATION...(For the 00Z TAFS Through 00Z Tuesday Evening)
Issued At 524 PM MDT Mon May 7 2018

Scattered showers and thunderstorms will continue to impact the
area this evening into the overnight hours. Temporary MVFR/IFR
conditions and wind gusts 30-40 kt are possible in the
thunderstorms. Otherwise, VFR conditions are expected.

&&

.UNR WATCHES/WARNINGS/ADVISORIES...
SD...None.
WY...None.
&&

DISCUSSION...MLS
AVIATION...Sherburn

Hazardous weather outlook, May 7, 3:13 AM MDT, 15 hours 43 minutes before

Hazardous Weather Outlook
National Weather Service Rapid City SD
313 AM MDT Mon May 7 2018

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-081300-
Harding-Perkins-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-Tripp-
Sturgis/Piedmont Foot Hills-Southern Meade Co Plains-
Hermosa Foot Hills-Northern Campbell-Southern Campbell-
Western Crook-Wyoming Black Hills-Weston-Northeastern Crook-
313 AM MDT Mon May 7 2018 /413 AM CDT Mon May 7 2018/

This Hazardous Weather Outlook is for western South Dakota and
northeastern Wyoming.

.DAY ONE...Today and Tonight

Scattered afternoon and evening thunderstorms are expected this
afternoon and evening. Widespread severe weather is not expected.
However, a few storms could be strong to severe, with hail and
gusty winds possible.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

A near daily chance of showers and thunderstorms are expected this
week. Widespread severe weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today.

&&

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

In the hours before

Special weather statement, May 7, 6:41 PM MDT, 15 minutes before

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Local storm report, May 7, 6:43 PM MDT, 13 minutes before

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Local storm report, May 7, 6:44 PM MDT, 12 minutes before

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Local storm report, May 7, 6:49 PM MDT, 7 minutes before

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Special weather statement, May 7, 6:51 PM MDT, 5 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
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Local storm report, May 7, 6:54 PM MDT, 2 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 7, 6:07 PM MDT	Severe Thunderstorm Warning	UNR	Meade, Perkins, Ziebach	41 min
May 7, 6:35 PM MDT	Special Weather Statement	UNR	Perkins	25 min
May 7, 6:51 PM MDT	Special Weather Statement	UNR	Ziebach	39 min
May 7, 7:33 PM MDT	Special Weather Statement	UNR	Todd	42 min
May 7, 7:47 PM MDT	Severe Thunderstorm Warning	UNR	Mellette, Todd	43 min
May 7, 8:06 PM MDT	Special Weather Statement	UNR	Todd	24 min
May 7, 8:27 PM MDT	Special Weather Statement	UNR	Tripp	63 min
May 7, 9:16 PM MDT	Special Weather Statement	UNR	Todd	44 min
May 7, 9:44 PM MDT	Special Weather Statement	UNR	Todd	46 min
May 7, 6:23 PM MDT	Special Weather Statement	UNR	Crook	37 min
May 7, 6:34 PM MDT	Severe Thunderstorm Warning	UNR	Crook, Weston	26 min
May 7, 6:41 PM MDT	Special Weather Statement	UNR	Campbell	49 min
May 7, 6:59 PM MDT	Severe Thunderstorm Warning	UNR	Crook, Weston	46 min
May 7, 7:01 PM MDT	Special Weather Statement	UNR	Campbell	44 min
May 7, 7:15 PM MDT	Special Weather Statement	UNR	Campbell	45 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2018 Every 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; radar from the NEXRAD Level II archive.