Alert archive / Montana / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 16, NWS Billings, MT

May 20, 2005Rosebud County, Montana

NWS Billings, MT issued this severe thunderstorm warning at May 20, 2005, 10:21 PM MDT for Rosebud County, Montana. It was in force for 60 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 20, 2005, 10:21 PM MDT (04:21 UTC)
Expired: May 20, 2005, 11:21 PM MDT
In force: 60 min
Issued by: NWS Billings, MT
Area: Counties, with a storm outline in the text

County Rosebud County, MT

The radar

The Billings radar (KBLX), 151 km from the middle of the area, began a volume at 04:23 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 20, 4:20 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 4.4 hours before the alert went out and 221 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: 2659 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: 88 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 May 20, 9:20 PM MDT, 1 hour 1 minute earlier.

Area forecast discussion, May 20, 9:20 PM MDT, 1 hour 1 minute before

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Hazardous weather outlook, May 20, 5:29 PM MDT, 4 hours 52 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
529 PM MDT FRI MAY 20 2005

MTZ028-029-034>036-038>042-056>058-064>068-212330-
SOUTHERN WHEATLAND-MUSSELSHELL-NORTHERN STILLWATER-YELLOWSTONE-
POWDER RIVER-SOUTHERN BIG HORN-EASTERN CARBON-NORTHERN PARK-
NORTHERN SWEET GRASS-GOLDEN VALLEY-RED LODGE FOOTHILLS-
NORTHERN BIG HORN-SOUTHERN ROSEBUD-PARADISE VALLEY-
LIVINGSTON AREA-BEARTOOTH FOOTHILLS-ABSAROKA/BEARTOOTH MOUNTAINS-
CRAZY MOUNTAINS-
529 PM MDT FRI MAY 20 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST
MONTANA...SOUTH CENTRAL MONTANA AND CENTRAL MONTANA.

.DAY ONE...TONIGHT

THUNDERSTORMS WILL CONTINUE TO DEVELOP ACROSS THE AREA TONIGHT. SOME
STORMS MAY BE SEVERE WITH LARGE HAIL AND DAMAGING WINDS...AND A
SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED THROUGH THIS EVENING.
PLEASE SEE WCNBYZ AND STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER
DETAILS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NO HAZARDOUS WEATHER EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

WYZ098-099-212330-
NORTHEAST BIG HORN MOUNTAINS-SHERIDAN FOOTHILLS-
529 PM MDT FRI MAY 20 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
WYOMING.

.DAY ONE...TONIGHT

NO HAZARDOUS WEATHER EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NO HAZARDOUS WEATHER EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

MTZ030>033-037-063-212330-
TREASURE-NORTHERN ROSEBUD-CUSTER-FALLON-CARTER-JUDITH GAP-
529 PM MDT FRI MAY 20 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST
MONTANA AND CENTRAL MONTANA.

.DAY ONE...TONIGHT

THUNDERSTORMS WILL CONTINUE TO DEVELOP ACROSS THE AREA TONIGHT. SOME
STORMS MAY BE SEVERE WITH LARGE HAIL AND DAMAGING WINDS...AND A
SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED THROUGH THIS EVENING.
PLEASE SEE WCNBYZ AND STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER
DETAILS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

A HIGH WIND WATCH IS IN EFFECT FOR LOCATIONS IN SOUTHEAST MONTANA
SATURDAY. NO HAZARDOUS WEATHER IS EXPECTED BEYOND SATURDAY. PLEASE
REFER TO GTFNPWBYZ FOR FURTHER DETAILS.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

In the hours before

Local storm report, May 20, 6:40 PM MDT, 3 hours 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BILLINGS MT
640 PM MDT FRI MAY 20 2005

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

0637 PM     HAIL             5 S RYEGATE             46.23N 109.25W
05/20/2005  1.00 INCH        GOLDEN VALLEY      MT   TRAINED SPOTTER

&&

FOISY

Local storm report, May 20, 6:47 PM MDT, 3 hours 34 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE BILLINGS MT
647 PM MDT FRI MAY 20 2005

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

0635 PM     HAIL             10 N ROUNDUP            46.59N 108.54W
05/20/2005  0.75 INCH        MUSSELSHELL        MT   TRAINED SPOTTER

0637 PM     HAIL             5 S RYEGATE             46.23N 109.25W
05/20/2005  1.00 INCH        GOLDEN VALLEY      MT   TRAINED SPOTTER

&&

FOISY

Local storm report, May 20, 7:11 PM MDT, 3 hours 10 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE BILLINGS MT
711 PM MDT FRI MAY 20 2005

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

0635 PM     HAIL             10 N ROUNDUP            46.59N 108.54W
05/20/2005  0.75 INCH        MUSSELSHELL        MT   TRAINED SPOTTER

0637 PM     HAIL             5 S RYEGATE             46.23N 109.25W
05/20/2005  1.00 INCH        GOLDEN VALLEY      MT   TRAINED SPOTTER

0705 PM     HAIL             7 E LAVINA              46.30N 108.79W
05/20/2005  1.75 INCH        MUSSELSHELL        MT   TRAINED SPOTTER

            DEAN CREEK AREA

&&

FOISY

Local storm report, May 20, 8:09 PM MDT, 2 hours 12 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 20, 6:01 PM MDT	Tornado Warning	BYZ	Sweet Grass	16 min
May 20, 6:08 PM MDT	Tornado Warning	BYZ	Golden Valley, Wheatland	37 min
May 20, 6:16 PM MDT	Severe Thunderstorm Warning	BYZ	Musselshell	29 min
May 20, 6:37 PM MDT	Tornado Warning	BYZ	Golden Valley, Stillwater	34 min
May 20, 6:45 PM MDT	Severe Thunderstorm Warning	BYZ	Musselshell, Rosebud	45 min
May 20, 7:00 PM MDT	Tornado Warning	BYZ	Musselshell	45 min
May 20, 7:29 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	61 min
May 20, 7:40 PM MDT	Tornado Warning	BYZ	Yellowstone	41 min
May 20, 8:19 PM MDT	Severe Thunderstorm Warning	BYZ	Treasure	41 min
May 20, 8:54 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	66 min
May 20, 10:32 PM MDT	Severe Thunderstorm Warning	BYZ	Custer	28 min
May 20, 11:17 PM MDT	Severe Thunderstorm Warning	BYZ	Custer	45 min

Nearby

Severe Thunderstorm Warnings in Montana, 2005 Every severe thunderstorm warning in 2005

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.