Alert archive / Montana / Tornado Warnings in 2001

Tornado Warning 7, NWS Glasgow, MT

July 19, 2001Wibaux County, Montana

NWS Glasgow, MT issued this tornado warning at Jul 19, 2001, 7:38 PM MDT for Wibaux County, Montana. It was in force for 67 min. 3 reports 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 19, 2001, 7:38 PM MDT (01:38 UTC)
Expired: Jul 19, 2001, 8:45 PM MDT
In force: 67 min
Issued by: NWS Glasgow, MT
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Wibaux County, MT

What was reported inside it

Time	Report	Where
Jul 19, 7:53 PM MDT	Hail 0.75	Wibaux, MT
Jul 19, 7:54 PM MDT	Hail 1.75	Wibaux, MT
Jul 19, 8:05 PM MDT	Hail 1	Wibaux, 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 19, 5:00 PM MDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 1.6 hours before the alert went out and 234 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: 667 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 1843 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -52 m²/s²
0-3 km storm-relative helicity: -3 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -2.2

Open this sounding in Storm Lab

The text

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

000 
WFUS55 KGGW 200138
TORGGW

MTC109-200245-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
738 PM MDT THU JUL 19 2001

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN WIBAUX COUNTY IN NORTHEAST MONTANA

* UNTIL 845 PM MDT

* AT 730 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO 22 MILES SOUTH OF WIBAUX...OR ABOUT 21 MILES SOUTHWEST OF
  BEACH...MOVING NORTHEAST AT 20 MPH.

* THE TORNADO PRODUCING STORM WILL REMAIN OVER...
  RURAL SOUTHERN WIBAUX COUNTY

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW0
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

LAT...LON 4668 10447 4666 10405 4696 10405 4706 10406
          4706 10429

.END
95

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at Jul 19, 2:22 PM MDT, 5 hours 16 minutes earlier.

Area forecast discussion, Jul 19, 2:22 PM MDT, 5 hours 16 minutes before

NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
222 PM MDT THU JUL 19 2001

VIGORUS SHORTWAVE OVER NORTH CENTRAL MT COMBINED WITH WEAK FRONTAL
BOUNDARY NEAR GGW AND JDN HAVE PRODUCED THUNDERSTORMS... SOME SEVERE
E OF GGW AT THIS TIME. THIS WAVE WILL MOVE INTO SW SASK BY 00Z.

STORMS WILL BE MOVING INTO MORE UNSTABLE AIR AS THE AFTERNOON
PROGRESSES. SE MT WILL HAVE THE MOST UNSTABLE AIR WITH CAPES
EXPECTED TO EXCEED 2000 J/KG AND LI OF -8 TO -10 ALONG AND SOUTH OF
I-94 WITH 1000-2000 J/KG CAPE EXPECTED OVER NE MT EAST OF JDN AND
GGW.  TORNADO WATCH IS IN EFFECT UNTIL 22Z.

THE LITTLE MOVEMENT EXPECT IN FRONTAL BOUNDARY THRU 18Z FRI THEN IT
MOVES WEST INTO CENTRAL MT FRIDAY NIGHT. DEW POINT ARE FORECASTED TO
INCREASE TO NEAR 70 ALONG THE NO DAK BORDER FRI AFTN. CAPES WILL
INCREASE TO OVER 3000 J/KG WITH LI OF -10 EAST OF OLF AND GDV BY 21Z
FRIDAY. STRONG VORT COUPLET SHORTWAVE FORECAST BY MESOETA ON SW FLOW
ALOFT OVER NE MT BETWEEN 15Z AND 21Z. MORE SEVERE WEATHER IS LIKELY
ON FRIDAY.  WILL MENTION SCT THUNDERSTORMS AND INCLUDE THE
POSSIBILITY OF SEVERE STORMS. WITH PRECIPTABLE WATER EXPECTED TO BE
BETWEEN 1.00 AND 1.40 INCHES...HEAVY RAIN IS POSSIBLE IN ANY STORMS
THAT DEVELOP.

SW FLOW ALOFT WILL REMAIN OVER MT INTO THE WEEKEND AS UPPER TROF
DEEPENS OVER THE WEST COAST. AIRMASS OVER NE MT WILL REMAIN UNSTABLE
FRIDAY NIGHT AND SATURDAY. HOWEVER...ONLY WEAK SHORTWAVES EXPECTED
SO WILL ONLY MENTION A CHANCE OF THUNDERSTORMS FRIDAY NIGHT AND
SATURDAY.  FORRESTER

EXTENDED...NOT MUCH CHANGE IN OVERALL PATTERN WITH SOUTHWEST FLOW
CONTINUING OVER THE REGION.  NO SURFACE FEATURES STAND OUT FOR OUR
CWA AFTER AN AREA OF LOW PRESSURE MOVES TO THE EAST OVER THE
WEEKEND. HIGH PRESSURE SLIDES INTO NORTHERN MN EARLY IN THE WEEK
WITH ANOTHER DEVELOPING LOW PRESSURE AREA OVER THE WESTERN PART OF
THE STATE BY THE END OF NEXT WEEK. FRANSEN

KGGW 063/083 062/088 058/085 057/082 058/083 058/083 058/084
      TTTTTBT  794533/9133323
KGDV 063/085 065/089 060/085 060/084 060/084 060/084 057/085
      TTTTTBT  798533/9133323

.GGW...TORNADO WATCH UNTIL 6 PM FOR ZONES 018>020-023>027-062.

In the hours before

Local storm report, Jul 19, 3:54 PM MDT, 3 hours 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
354 PM MDT THU JUL 19 2001

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1100 AM    34 NE (JDN)JORDAN         MT   .88 INCH HAIL
07/19/01   GARFIELD

0115 PM    33 NW CIRCLE              MT   .75 INCH HAIL
07/19/01   MCCONE

0130 PM    10 W CULBERTSON           MT   .88 INCH HAIL
07/19/01   ROOSEVELT

0215 PM    12 S POPLAR               MT   .75 INCH HAIL
07/19/01   RICHLAND

0244 PM    25 E MEDICINE LAKE        MT   60 MPH TSTM WIND GUST
07/19/01   SHERIDAN

TFJ

Special weather statement, Jul 19, 4:58 PM MDT, 2 hours 40 minutes before

MTZ018-019-023-200000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GLASGOW MT
458 PM MDT THU JUL 19 2001

THE NATIONAL WEATHER SERVICE HAS CLEARED A PORTION OF TORNADO WATCH
NUMBER 587. AREAS CLEARED FROM THE TORNADO WATCH INCLUDE:

IN NORTHEAST MONTANA:

DANIELS     MCCONE     SHERIDAN

THIS INCLUDES THE CITIES OF SCOBEY...CIRCLE AND PLENTYWOOD.

The office that day

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

Issued	Product	Office	Counties	Lasted
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, 5:27 PM MDT	Tornado Warning	GGW	Daniels	63 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.