Alert archive / Montana / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 161, NWS Glasgow, MT

August 11, 2000Petroleum County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Aug 11, 2000, 3:21 PM MDT for Petroleum 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 counties it named.

The facts

Issued: Aug 11, 2000, 3:21 PM MDT (21:21 UTC)
Expired: Aug 11, 2000, 4:15 PM MDT
In force: 54 min
Issued by: NWS Glasgow, MT
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Petroleum County, MT

The radar

The Billings radar (KBLX), 143 km from the middle of the area, began a volume at 21:20 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
Aug 11, 2:00 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 9.4 hours before the alert went out and 174 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: 437 J/kg
Mixed-layer CIN: -387 J/kg
Mixed-layer LCL: 2183 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 11, 2:22 PM MDT, 59 minutes earlier.

Area forecast discussion, Aug 11, 2:22 PM MDT, 59 minutes before

NORTHEAST MONTANA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
222 PM MDT FRI AUG 11 2000

SEVERE THUNDERSTORM WATCH FOR THE WESTERN PART OF CWA UNTIL 02Z.
FOR RIGHT NOW HAVE MOSTLY CLEAR SKIES AHEAD OF THE COLD FRONT JUST
NOW PASSING THROUGH GREAT FALLS. SOME THUNDERSTORMS HAVE OCCURRED
WEST OF THE GLASGOW CWA AND ARE STARTING TO MOVE INTO THE WESTERN
SIDE OF THE AREA. VORTMAX STEERING THE STORMS WILL MOVE NE INTO CANADA
FROM OUR WESTERN ZONES.

MEANWHILE MODELS SHOWED THESE FEATURES WELL TODAY AND LOOKS DRY FOR
THE WEEKEND.  TEMPERATURES ARE SLOWLY RETURNING TO MORE NORMAL
LEVELS AFTER THE RECORDS YESTERDAY.  MCNULTY

EXTENDED...EXTENDED PROGS IN GOOD AGREEMENT. A COLD FRONT EXITS THE
REGION ON MONDAY AS HIGH PRESSURE BUILDS INTO WESTERN MONTANA. ON
TUESDAY...A SURFACE LOW SPINS UP OVER CENTRAL MONTANA AHEAD OF A
SHORTWAVE TROUGH TRACKING ACROSS EXTREME SOUTHERN SASKATCHEWAN.
TEMPERATURES WILL BE WARMER AS A WARM FRONT LIFTS THROUGH THE AREA.
WILL BREAK OFF TUESDAY NIGHT TO MENTION A CHANCE OF THUNDERSTORMS
INTO WEDNESDAY AS THE SHORTWAVE TROUGH AND COLD FRONT MOVE THROUGH
THE AREA.  WATERHOUSE

KGGW BBBBT 060/086 054/0H87 055/084 056/088 059/084 813100/99123
KGDV BBBBT 060/089 055/084 055/083 055/088 058/084 813100/99123

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 2:27 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	63 min
Aug 11, 3:27 PM MDT	Severe Thunderstorm Warning	GGW	Phillips, Valley	63 min
Aug 11, 3:56 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	64 min
Aug 11, 4:16 PM MDT	Severe Thunderstorm Warning	GGW	Daniels	59 min
Aug 11, 4:35 PM MDT	Tornado Warning	GGW	Daniels	55 min
Aug 11, 4:57 PM MDT	Severe Thunderstorm Warning	GGW	Garfield	63 min
Aug 11, 5:02 PM MDT	Severe Thunderstorm Warning	GGW	McCone	58 min
Aug 11, 5:07 PM MDT	Severe Thunderstorm Warning	GGW	Prairie	53 min
Aug 11, 5:16 PM MDT	Severe Thunderstorm Warning	GGW	Sheridan	59 min
Aug 11, 5:59 PM MDT	Severe Thunderstorm Warning	GGW	Prairie	61 min

Nearby

Severe Thunderstorm Warnings in Montana, 2000 Every severe thunderstorm warning in 2000

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.