Alert archive / Montana / Tornado Warnings in 2001

Tornado Warning 13, NWS Glasgow, MT

July 20, 2001Daniels County, Montana

NWS Glasgow, MT issued this tornado warning at Jul 20, 2001, 5:27 PM MDT for Daniels 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: Jul 20, 2001, 5:27 PM MDT (23:27 UTC)
Expired: Jul 20, 2001, 6:30 PM MDT
In force: 63 min
Issued by: NWS Glasgow, MT
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Daniels County, MT

The radar

The Glasgow radar (KGGW), 94 km from the middle of the area, began a volume at 23:31 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

Time	Report	Where	Remark
Jul 20, 5:31 PM MDT	Tornado F0	Scobey, MT	Brief tornado occurred south of Scobey.

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 20, 12:30 PM MDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 11.5 hours before the alert went out and 91 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: 28 J/kg
Mixed-layer CIN: -349 J/kg
Mixed-layer LCL: 2123 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 133 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 
WFUS55 KGGW 202328
TORGGW

MTC019-210030-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
527 PM MDT FRI JUL 20 2001

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

* TORNADO WARNING FOR...
  DANIELS COUNTY IN NORTHEAST MONTANA

* UNTIL 630 PM MDT

* AT 520 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO 17 MILES NORTHWEST OF PEERLESS...OR ABOUT 11 MILES EAST OF
  OPHEIM...MOVING EAST AT 30 MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
  PORT OF SCOBEY AT 625 PM MDT

LAW ENFORCEMENT OFFICIALS REPORTED 3/4 INCH HAIL AT 5 P.M. NEAR THE 
PORT OF OPHEIM WITH THIS THUNDERSTORM.

LAT...LON 4899 10614 4884 10614 4884 10602 4863 10595
          4862 10504 4906 10524

.END
88

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 7:38 PM MDT	Tornado Warning	GGW	Wibaux	67 min
Jul 20, 9:22 AM MDT	Severe Thunderstorm Warning	GGW	Phillips	53 min
Jul 20, 11:47 AM MDT	Severe Thunderstorm Warning	GGW	Phillips	58 min
Jul 20, 12:14 PM MDT	Severe Thunderstorm Warning	GGW	Valley	61 min
Jul 20, 12:53 PM MDT	Severe Thunderstorm Warning	GGW	Daniels, Roosevelt	52 min
Jul 20, 1:14 PM MDT	Severe Thunderstorm Warning	GGW	Sheridan	61 min
Jul 20, 1:15 PM MDT	Severe Thunderstorm Warning	GGW	Valley	60 min
Jul 20, 2:49 PM MDT	Tornado Warning	GGW	Phillips	56 min
Jul 20, 3:25 PM MDT	Tornado Warning	GGW	Valley	65 min
Jul 20, 3:45 PM MDT	Tornado Warning	GGW	Phillips	45 min
Jul 20, 4:30 PM MDT	Tornado Warning	GGW	Garfield, Valley	60 min
Jul 20, 5:16 PM MDT	Tornado Warning	GGW	McCone	59 min
Jul 20, 5:30 PM MDT	Tornado Warning	GGW	Garfield	60 min

Nearby

Tornado Warnings in Montana, 2001 Every tornado warning in 2001 Tornadoes 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.