Alert archive / Montana / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 35, NWS Billings, MT

May 27, 2018Big Horn County, Rosebud County, Montana

NWS Billings, MT issued this severe thunderstorm warning at May 27, 2018, 12:52 AM MDT for Big Horn County, Rosebud County, Montana. It was in force for 23 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 27, 2018, 12:52 AM MDT (06:52 UTC)
Expired
May 27, 2018, 1:15 AM MDT
In force
23 min
Issued by
NWS Billings, MT
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Big Horn County, MT, Rosebud County, MT

The radar

The Billings radar (KBLX), 116 km from the middle of the area, began a volume at 06:55 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

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 6.9 hours before the alert went out and 269 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, Glasgow Intl Airport, MT at 00:00Z on 2018-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1409 joules per kilogram.LCLLFCEL10008507005003002001001 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, Glasgow Intl Airport, MT at 00:00Z on 2018-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.19395878Sfc1 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
1409 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
2385 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
114 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.0

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 Billings, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at May 26, 9:22 PM MDT, 3 hours 30 minutes earlier.

Area forecast discussion, May 26, 9:22 PM MDT, 3 hours 30 minutes before
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Hazardous weather outlook, May 26, 2:20 PM MDT, 10 hours 32 minutes before
Hazardous Weather Outlook
National Weather Service Billings MT
220 PM MDT Sat May 26 2018

MTZ028>042-056>058-063>068-WYZ098-099-272030-
Southern Wheatland-Musselshell-Treasure-Northern Rosebud-Custer-
Fallon-Northern Stillwater-Yellowstone-Powder River-Carter-
Southern Big Horn-Eastern Carbon-Northern Park-
Northern Sweet Grass-Golden Valley-Red Lodge Foothills-
Northern Big Horn-Southern Rosebud-Judith Gap-Paradise Valley-
Livingston Area-Beartooth Foothills-Absaroka/Beartooth Mountains-
Crazy Mountains-Northeast Bighorn Mountains-Sheridan Foothills-
220 PM MDT Sat May 26 2018

This Hazardous Weather Outlook is for portions of central
Montana...south central Montana...southeast Montana and north
central Wyoming.

* WHAT...Strong to severe thunderstorms producing hail and gusty
  winds late this afternoon through tonight and again tomorrow
  afternoon. Very heavy rainfall Sunday and Monday could produce
  localized flooding.

* WHERE...Southern Montana and northern Wyoming.

* WHEN...Memorial Day Weekend.

* ADDITIONAL HAZARD CONCERNS...Anyone with outdoor plans this
  Memorial Day weekend should monitor the weather forecast, and be
  ready to take cover.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Stay tuned for updates. Begin preparations to mitigate any impacts
that could result from the hazardous weather.

In the hours before

Special weather statement, May 26, 11:44 PM MDT, 1 hour 8 minutes before
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Special weather statement, May 27, 12:04 AM MDT, 48 minutes before
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Special weather statement, May 27, 12:24 AM MDT, 28 minutes before
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Special weather statement, May 27, 12:31 AM MDT, 21 minutes before
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Special weather statement, May 27, 12:37 AM MDT, 15 minutes before
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Special weather statement, May 27, 12:39 AM MDT, 13 minutes before
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The office that day

Everything else NWS Billings, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 26, 6:09 PM MDTSpecial Weather StatementBYZSweet Grass51 min
May 26, 6:32 PM MDTSpecial Weather StatementBYZYellowstone28 min
May 26, 6:46 PM MDTSevere Thunderstorm WarningBYZBig Horn42 min
May 26, 7:00 PM MDTSpecial Weather StatementBYZGolden Valley30 min
May 26, 7:07 PM MDTSevere Thunderstorm WarningBYZWheatland15 min
May 26, 7:29 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Sweet Grass, Wheatland61 min
May 26, 7:54 PM MDTFlash Flood WarningBYZGolden Valley, Wheatland3 hr
May 26, 8:00 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Stillwater, Wheatland60 min
May 26, 8:16 PM MDTSpecial Weather StatementBYZSweet Grass44 min
May 26, 8:57 PM MDTSpecial Weather StatementBYZStillwater63 min
May 26, 9:18 PM MDTSpecial Weather StatementBYZGarfield27 min
May 26, 9:20 PM MDTFlash Flood WarningBYZGolden Valley, Stillwater, Wheatland115 min
May 26, 10:05 PM MDTSpecial Weather StatementBYZStillwater25 min
May 26, 11:44 PM MDTSpecial Weather StatementBYZBig Horn31 min
May 27, 12:24 AM MDTSpecial Weather StatementBYZ36 min
May 27, 12:39 AM MDTSpecial Weather StatementBYZCuster36 min
May 27, 1:15 AM MDTSpecial Weather StatementBYZPowder River30 min
May 27, 1:25 AM MDTSpecial Weather StatementBYZFallon35 min
May 27, 2:26 AM MDTSpecial Weather StatementBYZFallon34 min
May 27, 3:05 AM MDTSpecial Weather StatementBYZFallon25 min
May 27, 4:25 AM MDTFlood WatchBYZBig Horn, Carbon, Carter, Powder River40 hr
May 27, 12:27 PM MDTRiver Flood WarningBYZRosebud5 days
May 27, 5:46 PM MDTSpecial Weather StatementBYZStillwater44 min
May 26, 11:22 PM MDTSpecial Weather StatementBYZSheridan38 min
May 27, 12:04 AM MDTSpecial Weather StatementBYZSheridan26 min
May 27, 12:31 AM MDTSpecial Weather StatementBYZSheridan29 min
May 27, 12:37 AM MDTSpecial Weather StatementBYZSheridan23 min

Nearby

Severe Thunderstorm Warnings in Montana, 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.