Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 46, NWS Glasgow, MT

July 5, 2001Dawson County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 5, 2001, 8:17 PM MDT for Dawson County, Montana. It was in force for 58 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 5, 2001, 8:17 PM MDT (02:17 UTC)
Expired: Jul 5, 2001, 9:15 PM MDT
In force: 58 min
Issued by: NWS Glasgow, MT
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Dawson County, MT

What was reported inside it

Time	Report	Where	Remark
Jul 5, 8:50 PM MDT	Hail 0.88	Glendive, 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 5, 8:00 PM MDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 2.3 hours before the alert went out and 166 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: 2576 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 2345 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 274 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.3

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 Jul 5, 9:10 AM MDT, 11 hours 7 minutes earlier.

Area forecast discussion, Jul 5, 9:10 AM MDT, 11 hours 7 minutes before

NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
910 AM MDT THU JUL 5 2001

UPDATES ON THE WAY.

UPPER LEVEL RIDGE REMAINS CENTERED OVER EASTERN MONTANA THIS
MORNING. 12Z ETA DOING A GOOD JOB OF INITIALIZING UPPER LEVEL
FEATURES. SURFACE OBS SHOW INSTABILITY/MOISTURE AXIS IN PLACE ALONG
A LINE FROM MALTA...TO JORDAN...TO MILES CITY. BOTH THE 06Z AVN AND
THE 12Z ETA DO A GOOD JOB OF PICKING THIS UP. GIVEN THE BETTER
INITIALIZATION OF THE UPPER LEVEL FEATURES WITH THE ETA...I AM
INCLINED TO RELY MORE ON THE ETA FOR DETAILS THAN THE AVN. BY 00Z
THE ETA PRODUCES LI/S OF -5 ACROSS ENTIRE EASTERN HALF OF CWA. 700MB
TROUGH OVER WESTERN HALF OF CWA AT THIS TIME WILL HELP TO PRODUCE
SOME LIFT OVER THE EASTERN PLAINS. FORECAST SOUNDINGS NEAR SIDNEY
AND PLENTYWOOD INDICATE CAPE VALUES OF 2200-2600 J/KG. LOW LEVEL
SOUTHEAST FLOW WITH WESTERLY UPPER LEVEL FLOW WILL PROVIDE A GOOD
SHEAR ENVIRONMENT. FOCUS OF ANY SEVERE WEATHER SHOULD BE CONFINED TO
THE EASTERN HALF OF MY CWA THIS AFTERNOON. WILL UPDATE TO ADD
MENTION OF SEVERE THUNDERSTORMS.  POHL

EXTENDED...NE MT REMAINS ON PERIPHERY OF UPPER HIGH THAT SHIFTS
BETWEEN THE CENTRAL GREAT PLAINS AND CENTRAL ROCKIES FOR THE
FORESEEABLE FUTURE. SHORTWAVES CONTINUE TO ROTATE AROUND THIS HIGH
ACROSS MT BUT TRACK OF THESE WAVES CHANGES FROM RUN TO RUN. WILL NOT
CHANGE EXTENDED.  FORRESTER

KGGW /089 062/080 05@3/085 057/087 057/087 059/088 060/086
      TBBTABB  79331/7923222
KGDV /090 062/082 052/083 056/087 056/088 058/089 057/085
      TBBTABB  79431/7923222

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 8:01 PM MDT	Severe Thunderstorm Warning	GGW	Roosevelt	89 min
Jul 5, 8:47 PM MDT	Severe Thunderstorm Warning	GGW	Roosevelt, Sheridan	88 min
Jul 5, 9:31 PM MDT	Tornado Warning	GGW	Richland	59 min
Jul 5, 9:33 PM MDT	Tornado Warning	GGW	Roosevelt	42 min
Jul 5, 9:54 PM MDT	Severe Thunderstorm Warning	GGW	Dawson	36 min
Jul 5, 10:30 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Wibaux	60 min
Jul 5, 10:45 PM MDT	Severe Thunderstorm Warning	GGW	Prairie	60 min

Nearby

Severe Thunderstorm Warnings in Montana, 2001 Every 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.