Alert archive / Montana / Special Weather Statements in 2018

Special Weather Statement, NWS Billings, MT

May 7, 2018Custer County, Montana

NWS Billings, MT issued this special weather statement at May 7, 2018, 5:21 PM MDT for Custer County, Montana. It was in force for 54 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 7, 2018, 5:21 PM MDT (23:21 UTC)
Expired: May 7, 2018, 6:15 PM MDT
In force: 54 min
Issued by: NWS Billings, MT

County Custer County, MT

The radar

The Glasgow radar (KGGW), 192 km from the middle of the area, began a volume at 23:23 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

Bismarck Municip, ND (KBIS), launched 12:00Z, 11.4 hours before the alert went out and 382 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2285 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at May 7, 2:59 PM MDT, 2 hours 22 minutes earlier.

Area forecast discussion, May 7, 2:59 PM MDT, 2 hours 22 minutes before

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Hazardous weather outlook, May 7, 4:30 AM MDT, 12 hours 51 minutes before

Hazardous Weather Outlook
National Weather Service Billings MT
430 AM MDT Mon May 7 2018

MTZ031>033-036>038-058-WYZ099-081030-
Northern Rosebud-Custer-Fallon-Powder River-Carter-
Southern Big Horn-Southern Rosebud-Sheridan Foothills-
430 AM MDT Mon May 7 2018

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

* WHAT... Strong Thunderstorms.

* WHERE...Southeast Montana and North Central Wyoming

* WHEN...This afternoon through this evening.

* ADDITIONAL DETAILS...Storms will produce heavy rain...small hail
  and gusty winds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Hazardous Weather Outlook is issued when hazardous weather could
impact the region within the next week. Be sure to stay tuned for
future updates as locations, timing, and impacts could change.
Begin preparations to mitigate any impacts that could result from
the hazardous weather.

&&

In the hours before

Local storm report, May 7, 3:16 PM MDT, 2 hours 5 minutes before

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Local storm report, May 7, 3:28 PM MDT, 1 hour 53 minutes before

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Local storm report, May 7, 3:36 PM MDT, 1 hour 45 minutes before

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Local storm report, May 7, 3:47 PM MDT, 1 hour 34 minutes before

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Special weather statement, May 7, 4:17 PM MDT, 1 hour 4 minutes before

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Special weather statement, May 7, 5:21 PM MDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 6, 6:14 PM MDT	Special Weather Statement	BYZ	Park	46 min
May 6, 7:54 PM MDT	Special Weather Statement	BYZ	Yellowstone	36 min
May 7, 1:52 PM MDT	Special Weather Statement	BYZ	Yellowstone	38 min
May 7, 2:04 PM MDT	Severe Thunderstorm Warning	BYZ	Treasure, Yellowstone	56 min
May 7, 2:37 PM MDT	Special Weather Statement	BYZ	Big Horn	53 min
May 7, 3:00 PM MDT	Severe Thunderstorm Warning	BYZ	Big Horn, Treasure, Yellowstone	60 min
May 7, 4:17 PM MDT	Special Weather Statement	BYZ	Rosebud	58 min

Nearby

Special Weather Statements in Montana, 2018 Every special weather statement 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.