Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 2, NWS Glasgow, MT

June 9, 2001Garfield County, McCone County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jun 9, 2001, 10:27 AM MDT for Garfield County, McCone County, Montana. It was in force for 63 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued
Jun 9, 2001, 10:27 AM MDT (16:27 UTC)
Expired
Jun 9, 2001, 11:30 AM MDT
In force
63 min
Issued by
NWS Glasgow, MT
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Garfield County, MT, McCone County, MT

The radar

The Glasgow radar (KGGW), 102 km from the middle of the area, began a volume at 16:17 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.

What was reported inside it

TimeReportWhereRemark
Jun 9, 11:20 AM MDTHail 0.75Circle, MT

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 4.5 hours before the alert went out and 102 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, Glasgow Intl Airport, MT at 12:00Z on 2001-06-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 37 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, Glasgow Intl Airport, MT at 12:00Z on 2001-06-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 145 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
37 J/kg
Mixed-layer CIN
-228 J/kg
Mixed-layer LCL
1810 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
145 m²/s²
0-3 km storm-relative helicity
127 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS55 KGGW 091630
SVRGGW

MTC033-055-091730-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
1027 AM MDT SAT JUN 9 2001

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN GARFIELD COUNTY IN NORTHEAST MONTANA
  SOUTHERN MCCONE COUNTY IN NORTHEAST MONTANA

* UNTIL 1130 AM MDT

* AT 1022 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 23 MILES WEST OF CIRCLE TO 27    
  MILES EAST OF JORDAN...MOVING EAST AT 20 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  BROCKWAY BY 1120 AM MDT
  CIRCLE BY 1125 AM MDT

A TRAINED WEATHER SPOTTER REPORTED 60 MPH WINDS IN NORTHEASTERN 
GARFIELD COUNTY AT 10 AM.  ALSO NICKEL SIZE HAIL WAS REPORTED AT 
1005 AM 12 MILES EAST OF JORDAN.


LAT...LON 4763 10611 4738 10627 4724 10654 4719 10574
          4731 10545 4754 10537

.END
91


:

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 Jun 9, 9:35 AM MDT, 52 minutes earlier.

Area forecast discussion, Jun 9, 9:35 AM MDT, 52 minutes before
NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
935 AM MDT SAT JUN 9 2001

THUNDERSTORMS TRACKING ALONG FORT PECK LAKE THIS MORNING ASSOCIATED
WITH SURFACE BOUNDARY. STORMS INTERACTING WITH OUTFLOW BOUNDARY LEFT
FROM STORMS OVER SOUTHEAST MONTANA OVERNIGHT. THREAT FOR
THUNDERSTORMS WILL CONTINUE THROUGH THE DAY AS JET PUSHES INTO
STATE. CURRENT FORECAST LOOKS OKAY...NO UPDATE PLANNED. EBERT

EXTENDED...NO CHANGE. A WET PATTERN EARLY...THEN RIDGING AND DRYING.
PROTON

KGGW /084 056/082 056/082 051/066 049/070 051/072 050/074
      TTTTBBB  94433/9433111
KGDV /086 055/084 056/086 048/070 050/071 051/074 051/074
      TTTTBBB  94443/9433111

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 9, 9:12 AM MDTSevere Thunderstorm WarningGGWGarfield63 min
Jun 9, 10:28 AM MDTSevere Thunderstorm WarningGGWPhillips62 min
Jun 9, 11:24 AM MDTSevere Thunderstorm WarningGGWDawson66 min
Jun 9, 11:29 AM MDTSevere Thunderstorm WarningGGWPhillips, Valley61 min
Jun 9, 12:28 PM MDTSevere Thunderstorm WarningGGWGarfield, Valley62 min
Jun 9, 1:53 PM MDTSevere Thunderstorm WarningGGWSheridan37 min
Jun 9, 2:39 PM MDTSevere Thunderstorm WarningGGWDawson, McCone36 min
Jun 9, 3:40 PM MDTSevere Thunderstorm WarningGGWRichland35 min

Nearby

Severe Thunderstorm Warnings in Montana, 2001Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.