Alert archive / Montana / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 20, NWS Billings, MT

July 16, 2017Stillwater County, Yellowstone County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Jul 16, 2017, 2:12 PM MDT for Stillwater County, Yellowstone County, Montana. It was in force for 48 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
Jul 16, 2017, 2:12 PM MDT (20:12 UTC)
Expired
Jul 16, 2017, 3:00 PM MDT
In force
48 min
Issued by
NWS Billings, MT
Area
Storm-based polygon
Hail
0.88 in
Wind
60.0 mph

Counties Stillwater County, MT, Yellowstone County, MT

The radar

The Billings radar (KBLX), 19 km from the middle of the area, began a volume at 20:14 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

Great_falls, MT (KTFX), launched 12:00Z, 8.2 hours before the alert went out and 228 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, Great_falls, MT at 12:00Z on 2017-07-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 145 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, Great_falls, MT at 12:00Z on 2017-07-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 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
145 J/kg
Mixed-layer CIN
-292 J/kg
Mixed-layer LCL
2281 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
115 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Jul 16, 10:05 AM MDT, 4 hours 7 minutes earlier.

Area forecast discussion, Jul 16, 10:05 AM MDT, 4 hours 7 minutes before
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Hazardous weather outlook, Jul 16, 9:50 AM MDT, 4 hours 22 minutes before
Hazardous Weather Outlook
National Weather Service Billings MT
950 AM MDT Sun Jul 16 2017

MTZ029>033-035>039-042-057-058-WYZ098-099-161700-
Musselshell-Treasure-Northern Rosebud-Custer-Fallon-Yellowstone-
Powder River-Carter-Southern Big Horn-Eastern Carbon-Golden Valley-
Northern Big Horn-Southern Rosebud-Northeast Bighorn Mountains-
Sheridan Foothills-
950 AM MDT Sun Jul 16 2017

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

* Hazards: Strong to severe thunderstorms associated with a cold
  front this afternoon and evening.

* Impacts: Thunderstorm wind gusts of 40 to 60 mph and significant
  lightning increasing the wildfire threat, as well as potential
  property damage from the 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.

MTZ028-034-040-041-056-064>068-161700-
Southern Wheatland-Northern Stillwater-Northern Park-
Northern Sweet Grass-Red Lodge Foothills-Paradise Valley-
Livingston Area-Beartooth Foothills-Absaroka/Beartooth Mountains-
Crazy Mountains-
950 AM MDT Sun Jul 16 2017

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

* Hazards: Strong to severe thunderstorms associated with a cold
  front this afternoon and evening.

* Impacts: Thunderstorm wind gusts of 40 to 60 mph and significant
  lightning increasing the wildfire threat, as well as potential
  property damage from the 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.

MTZ063-161700-
Judith Gap-
950 AM MDT Sun Jul 16 2017

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

* Hazards: Strong to severe thunderstorms associated with a cold
  front this afternoon and evening.

* Impacts: Thunderstorm wind gusts of 40 to 60 mph and significant
  lightning increasing the wildfire threat, as well as potential
  property damage from the 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, Jul 16, 10:41 AM MDT, 3 hours 31 minutes before
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Special weather statement, Jul 16, 1:27 PM MDT, 45 minutes before
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Special weather statement, Jul 16, 1:52 PM MDT, 20 minutes before
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Local storm report, Jul 16, 2:10 PM MDT, 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BILLINGS MT
210 PM MDT SUN JUL 16 2017

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

0200 PM     TSTM WND GST     5 N REED POINT          45.77N 109.55W
07/16/2017  M55.00 MPH       STILLWATER         MT   TRAINED SPOTTER

&&

LD
Local storm report, Jul 16, 2:12 PM MDT, 0 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BILLINGS MT
212 PM MDT SUN JUL 16 2017

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

0211 PM     HAIL             11 SE PRAY              45.28N 110.51W
07/16/2017  M1.00 INCH       PARK               MT   TRAINED SPOTTER

&&

LD

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 15, 6:47 PM MDTSpecial Weather StatementBYZBig Horn58 min
Jul 15, 8:52 PM MDTSpecial Weather StatementBYZRosebud38 min
Jul 16, 1:27 PM MDTSpecial Weather StatementBYZPark63 min
Jul 16, 1:52 PM MDTSpecial Weather StatementBYZStillwater53 min
Jul 16, 2:36 PM MDTSpecial Weather StatementBYZMusselshell39 min
Jul 16, 2:58 PM MDTSevere Thunderstorm WarningBYZCarbon, Stillwater, Sweet Grass, Yellowstone62 min
Jul 16, 3:19 PM MDTSpecial Weather StatementBYZMusselshell41 min
Jul 16, 3:48 PM MDTSpecial Weather StatementBYZTreasure42 min
Jul 16, 4:06 PM MDTSpecial Weather StatementBYZTreasure84 min
Jul 16, 4:44 PM MDTSpecial Weather StatementBYZBig Horn, Rosebud, Treasure61 min
Jul 16, 5:36 PM MDTSpecial Weather StatementBYZCuster69 min
Jul 16, 5:38 PM MDTSpecial Weather StatementBYZSheridan67 min

Nearby

Severe Thunderstorm Warnings in Montana, 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.