Alert archive / Montana / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 21, NWS Glasgow, MT

June 20, 2003McCone County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jun 20, 2003, 4:58 PM MDT for McCone County, Montana. It was in force for 62 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: Jun 20, 2003, 4:58 PM MDT (22:58 UTC)
Expired: Jun 20, 2003, 6:00 PM MDT
In force: 62 min
Issued by: NWS Glasgow, MT
Area: Counties, with a storm outline in the text

County McCone County, MT

The radar

The Glasgow radar (KGGW), 59 km from the middle of the area, began a volume at 22:58 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
Jun 20, 3:30 PM MDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 11.0 hours before the alert went out and 58 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: 14 J/kg
Mixed-layer CIN: -504 J/kg
Mixed-layer LCL: 1413 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS55 KGGW 202258
SVRGGW
MTC055-210000-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
457 PM MDT FRI JUN 20 2003

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN MCCONE COUNTY IN NORTHEAST MONTANA

* UNTIL 600 PM MDT

* AT 448 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 10 MILES NORTHEAST OF NELSON CREEK RECREATION
  AREA...OR ABOUT 28 MILES NORTHWEST OF CIRCLE...MOVING NORTH AT 20
  MPH.

* THE SEVERE THUNDERSTORM WILL REMAIN OVER...
  RURAL WESTERN MCCONE COUNTY

VERY LARGE HAIL IS POSSIBLE WITH THIS STORM. IF YOU ARE IN THE PATH
OF THE STORM...SEEK SHELTER INDOORS.

STRONG AND DAMAGING WINDS ARE LIKELY WITH THIS STORM. TAKE COVER IN A
SUBSTANTIAL SHELTER UNTIL THE STORM PASSES.

THIS WARNING EXTENDS THE SEVERE THUNDERSTORM WARNING PREVIOUSLY
ISSUED FOR THE AREA.

LAT...LON 4806 10547 4739 10627 4803 10623 4799 10611
          4803 10607 4799 10602

$$

KLEINSASSER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 6:15 PM MDT	Severe Thunderstorm Warning	GGW	Petroleum	60 min
Jun 19, 6:36 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	54 min
Jun 19, 8:25 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	65 min
Jun 19, 8:45 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	60 min
Jun 19, 9:38 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	52 min
Jun 20, 3:15 PM MDT	Severe Thunderstorm Warning	GGW	McCone	60 min
Jun 20, 3:25 PM MDT	Severe Thunderstorm Warning	GGW	Wibaux	65 min
Jun 20, 4:07 PM MDT	Severe Thunderstorm Warning	GGW	McCone	53 min
Jun 20, 4:09 PM MDT	Severe Thunderstorm Warning	GGW	Valley	66 min
Jun 20, 4:17 PM MDT	Severe Thunderstorm Warning	GGW	Roosevelt	58 min
Jun 20, 4:59 PM MDT	Severe Thunderstorm Warning	GGW	Petroleum, Phillips	61 min
Jun 20, 5:13 PM MDT	Severe Thunderstorm Warning	GGW	Roosevelt	62 min
Jun 20, 5:16 PM MDT	Severe Thunderstorm Warning	GGW	Valley	59 min

Nearby

Severe Thunderstorm Warnings in Montana, 2003 Every severe thunderstorm warning in 2003

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.