Damaging Winds in Wyoming, June 7, 2018

Name: Damaging Winds in Wyoming, June 7, 2018
Start: 2018-06-07T18:05
End: 2018-06-07T18:12
Location: Wyoming

June 7, 2018 · NWS UNR · 2 events in 1 county or zone

A severe thunderstorm clipped far northern Campbell County, bringing wind gusts around 60 mph north of Recluse.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

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The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 2

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS UNR wrote it up.

A severe thunderstorm clipped far northern Campbell County, bringing wind gusts around 60 mph north of Recluse.

What forecasters said that day

The local office's own words before the first event, 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 the first event at Jun 7, 4:11 PM MST, 1 hour 54 minutes earlier.

Area forecast discussion, Jun 7, 4:11 PM MST, 1 hour 54 minutes before

Area Forecast Discussion For Western SD and Northeastern WY
National Weather Service Rapid City SD
511 PM MDT Thu Jun 7 2018

.DISCUSSION...(This Evening Through Thursday)
Issued at 202 PM MDT Thu Jun 7 2018

The broad upper ridge continues to cover much of the CONUS. Skies
across the northern plains are mostly cloudy, and radar shows a
few weak storms over northwestern SD. With a surface high to the
east, winds are southeasterly around 10 kts. Temperatures are
rising into the 80s, and dew points across the western SD plains
are in the 60s.

Thunderstorms will develop across the area late this afternoon into
this evening, as another shortwave crosses the region. Models differ
on the timing of the wave, but storms have recently popped up just
west of the CWA, and are expected to progress eastward through
the evening. Several CAMs indicate two clusters of storms - one
across the northern CWA and one across the south, associated with
two vorticity maxima. Instability forecasts have decreased a bit
from yesterday's, but still showing 2000-3000 J/kg MLCAPE. This
combined with 0-6 km shear of 35-40 kts, severe thunderstorms will
be possible. Besides large hail and strong winds, tornadoes
cannot be ruled out: LCL heights across much of the SD plains are
1 km or less, with more than 200 m2/s2 0-1 km helicity and 20 kts
of 0-1 km shear. However, models are showing strong CIN across the
western SD plains, so that may inhibit things there. Storms will
exit the CWA late tonight.

Instability will redevelop across central SD on Friday in
southeasterly low-level flow, as dew points there approach 70. Yet
another shortwave will slide through the northern plains in the
evening, aimed at south central SD. Excellent CAPE and somewhat
decent shear will result in another round of potentially severe
weather.

The setup for Saturday looks similar to that of Friday, with the
best chance of storms across south central SD. On Sunday, the upper
ridge will start shifting east as a large upper trough pushes into
the northern plains. Temperatures will be hot for the weekend, but
then a cold front will sweep through the region Sunday night.
Conditions for early next week look mild and dry.

&&

.AVIATION...(For the 00Z TAFS Through 00Z Friday Evening)
Issued At 510 PM MDT Thu Jun 7 2018

Scattered thunderstorms will continue to develop this afternoon
across northeast WY and the Black Hills, then spread east this
evening on the SD plains. IFR visibilities expected within heavier
storms. VFR conditions expected outside of any thunderstorms.

&&

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

DISCUSSION...Pojorlie
AVIATION...Johnson

Hazardous weather outlook, Jun 7, 2:04 AM MST, 16 hours 1 minute before

Hazardous Weather Outlook
National Weather Service Rapid City SD
304 AM MDT Thu Jun 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-
304 AM MDT Thu Jun 7 2018 /404 AM CDT Thu Jun 7 2018/

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

.DAY ONE...Today and Tonight

Scattered thunderstorms are expected this afternoon into tonight.
There is a slight risk of severe thunderstorms with large hail and
damaging winds. There is a small threat for tornadoes.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

There is a chance of thunderstorms each day through the weekend.
Strong to severe storms will be possible Friday and Saturday.

.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

In the hours before

Special weather statement, Jun 7, 3:00 PM MST, 3 hours 5 minutes before

Special Weather Statement
National Weather Service Rapid City SD
400 PM MDT THU JUN 7 2018

SDZ024-025-072245-
Northern Black Hills SD-Northern Foot Hills SD-
400 PM MDT THU JUN 7 2018

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL LAWRENCE COUNTY UNTIL 445
PM MDT...

At 400 PM MDT, Doppler radar was tracking a strong thunderstorm over
Deadwood, or over Lead, moving east at 10 mph.

Dime size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Lead, Deadwood, Whitewood, Central City, Galena, Brownsville and
Apple Springs.

This Includes Interstate 90 in South Dakota between Mile Markers 24
and 28.

A severe thunderstorm watch remains in effect until 1100 PM MDT for
west central South Dakota.

LAT...LON 4430 10383 4444 10382 4448 10357 4425 10357
TIME...MOT...LOC 2200Z 270DEG 10KT 4436 10372

Helgeson

Special weather statement, Jun 7, 3:42 PM MST, 2 hours 23 minutes before

Special Weather Statement
National Weather Service Rapid City SD
442 PM MDT THU JUN 7 2018

SDZ024-072330-
Northern Black Hills SD-
442 PM MDT THU JUN 7 2018

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL LAWRENCE COUNTY UNTIL 530
PM MDT...

At 441 PM MDT, Doppler radar was tracking a strong thunderstorm over
Terry Peak, or near Lead, moving west at 5 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Lead, Deadwood, Central City, Cheyenne Crossing, Galena, Brownsville,
Roughlock Falls, Savoy, Terry Peak and southern Spearfish Canyon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

A severe thunderstorm watch remains in effect until 1100 PM MDT for
west central South Dakota.

LAT...LON 4435 10398 4441 10374 4438 10369 4429 10361
      4423 10387
TIME...MOT...LOC 2241Z 079DEG 6KT 4431 10383

Helgeson

Local storm report, Jun 7, 4:44 PM MST, 1 hour 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
544 PM MDT THU JUN 07 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0542 PM     HAIL             13 SE DEADWOOD          44.24N 103.54W
06/07/2018  E1.00 INCH       LAWRENCE           SD   PUBLIC

&&

ME

Local storm report, Jun 7, 4:58 PM MST, 1 hour 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
558 PM MDT THU JUN 07 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0530 PM     HAIL             10 S DEADWOOD           44.23N 103.73W
06/07/2018  E1.25 INCH       LAWRENCE           SD   STORM CHASER

&&

ME

Local storm report, Jun 7, 4:59 PM MST, 1 hour 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
559 PM MDT THU JUN 07 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0555 PM     HAIL             3 WNW NEMO              44.21N 103.55W
06/07/2018  M1.00 INCH       LAWRENCE           SD   TRAINED SPOTTER

            1.30 INCH HEAY RAINFALL

&&

KCLARK

Local storm report, Jun 7, 5:45 PM MST, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
645 PM MDT THU JUN 07 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0450 PM     HAIL             6 SSW LEAD              44.28N 103.81W
06/07/2018  E1.50 INCH       LAWRENCE           SD   COCORAHS

&&

ME

The radar

The Billings radar (KBLX), 246 km away, was scanning. The volume nearest the first event began at 01:02 UTC.

Open the radar archive at this moment

Event by event

2 thunderstorm wind. Local standard time, as filed.

Thunderstorm Wind, Campbell

When: June 7, 6:05 PM MST
Where: Campbell County, 17.28 mi N of Recluse
Measured: 52 kt (60 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 44.990, -105.700

Four to six inch tree branches were broken.

Thunderstorm Wind, Campbell

When: June 7, 6:12 PM MST
Where: Campbell County, 14.36 mi NNW of Recluse
Measured: 52 kt (60 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 44.940, -105.790

Wind gusts were estimated at 60 mph.

What these are

Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Wyoming in 2018 Every state in 2018 This day in weather history Warnings in Wyoming, June 2018

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 751442, 751443.