Alert archive / Montana / Tornado Warnings in 2001
Tornado Warning 19, NWS Glasgow, MT
NWS Glasgow, MT issued this tornado warning at Jul 20, 2001, 8:43 PM MDT for Wibaux County, Montana. It was in force for 62 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, 8:43 PM MDT (02:43 UTC)
- Expired
- Jul 20, 2001, 9:45 PM MDT
- In force
- 62 min
- Issued by
- NWS Glasgow, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Wibaux County, MT
The radar
The Glasgow radar (KGGW), 218 km from the middle of the area, began a volume at 02:43 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, 9:00 PM MDT | Thunderstorm Wind 52 M | 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 20, 4:00 PM MDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 2.7 hours before the alert went out and 218 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.
- Mixed-layer CAPE
- 996 J/kg
- Mixed-layer CIN
- -183 J/kg
- Mixed-layer LCL
- 1651 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 331 m²/s²
- 0-3 km storm-relative helicity
- 373 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.6
The text
As transmitted, in the capitals the NWS used until 2016.
066
WFUS55 KGGW 210243
TORGGW
MTC109-210345-
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
843 PM MDT FRI JUL 20 2001
THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A
* TORNADO WARNING FOR...
WIBAUX COUNTY IN NORTHEAST MONTANA
* UNTIL 945 PM MDT
* AT 840 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
TORNADO 16 MILES NORTHWEST OF WIBAUX...MOVING EAST AT 20 MPH.
* THE TORNADO PRODUCING STORM WILL REMAIN OVER...
RURAL NORTHERN 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 LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
LAT...LON 4735 10443 4722 10433 4710 10430 4697 10432
4686 10447 4684 10459 4670 10458 4670 10435
4666 10432 4667 10406 4734 10409
.END
99What 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 20, 2:15 PM MDT, 6 hours 28 minutes earlier.
Area forecast discussion, Jul 20, 2:15 PM MDT, 6 hours 28 minutes before
NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
215 PM MDT FRI JUL 20 2001
SW FLOW WITH DISTURBANCES RIPPLING THROUGH THE FLOW WILL CONTINUE AFFECT
THE AREA INTO SATURDAY NIGHT. THIS MEANS SEVERE WEATHER POTENTIAL WILL
CONTINUE. ETA AND AVN IN FAIR AGREEMENT THROUGH THE PERIOD WITH
PLACEMENT OF SYSTEMS. 500 MB VORT LOBE OVER ALBERTA WITH THE TROF
EXTENDING DOWN INTO THE PAC NW LIFTS OUT INTO MANITOBA BY LATE
SUNDAY. AT 00Z MON...LI/S DROP TO BELOW 0 IN A PORTION OF THE CWA WITH
A WEAK UPPER RIDGE PUSHING IN FROM WESTERN MT. JAMBA
EXTENDED...MRF IN DISAGREEMENT WITH ECMWF AND CANADIAN GEM MODELS
BEYOND DAY 4. A REX BLOCK THAT THE MODELS AGREE WITH SUN/MON SPINS
INTO A DIFFERENT SOLUTION BY ALL MODELS BY TUE. MRF PULLS THE
LOW ACROSS MT AND KEEPS THE CHANCES OF THUNDERSTORMS ACROSS THE CWA
THROUGH FRI...WHILE THE CANADIAN AND THE ECMWF BUILD THE RIDGE OVER
MT WITH THE LOW STAYING NEAR THE WEST COAST. WILL KEEP WITH THE
CHANCES OF STORMS THROUGH WED...WITH A MAINLY DRY CONDITIONS FOR THU
AND FRI. JAMBA
KGGW 062/088 064/085 057/082 058/083 058/083 058/084 057/085
TTTTTBB 764352/7633322
KGDV 065/089 064/085 059/084 059/084 059/084 058/085 057/086
TTTTTBB 765352/7633322In the hours before
Local storm report, Jul 20, 7:50 PM MDT, 53 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
750 PM MDT FRI JUL 20 2001
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0500 PM 24 S GLASGOW MT 1.75 INCH HAIL
07/20/01 VALLEY
0630 PM 20 SW VIDA MT .75 INCH HAIL
07/20/01 MCCONE
0604 PM 20 W BROCKWAY MT 4-5 INCH HAIL
07/20/01 MCCONE TRUCK HEAVILY DAMAGED
0555 PM 12 SE FORT PECK MT 4.50 INCH HAIL
07/20/01 VALLEY
0430 PM 10 S HINSDALE MT TORNADO
07/20/01 VALLEY CROSSED COUNTY LINE
0600 PM 8 S FORT PECK MT 2.00 INCH HAIL
07/20/01 GARFIELD HAILED FOR 30 MINUTES
0622 PM 22 NW CIRCLE MT TORNADO
07/20/01 MCCONE LARGE TORNADO. MULTIPLE
VORTICES.
0451 PM 24 N BRUSETT MT 96 MPH TSTM WIND GUST
07/20/01 GARFIELD
0700 PM CIRCLE MT WIND DAMAGE
07/20/01 MCCONE 60 MPH WIND. TREES RIPPED
DOWN.
0320 PM 11 E SUN PRAIRIE MT TORNADO
07/20/01 PHILLIPS SPOTTED BY NWS PERSONNEL
IN GLASGOW
0340 PM 35 SW HINSDALE MT TORNADO
07/20/01 VALLEY SPOTTED BY NWS PERSONNEL
IN GLASGOW
0400 PM 20 S GLASGOW MT TORNADO
07/20/01 VALLEY HEADING TOWARD FORT PECK
0515 PM OPHEIM MT TORNADO
07/20/01 VALLEY FUNNEL CLOUDS SPOTTED BY
PUBLIC
0531 PM 21 N POPLAR MT TORNADO
07/20/01 ROOSEVELT PUBLIC REPORTED
WRIGHTThe office that day
Everything else NWS Glasgow, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 6:15 PM MDT | Tornado Warning | GGW | McCone | 60 min |
| Jul 20, 6:28 PM MDT | Flash Flood Warning | GGW | Garfield, McCone | 3 hr |
| Jul 20, 6:41 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 64 min |
| Jul 20, 6:56 PM MDT | Tornado Warning | GGW | Dawson | 64 min |
| Jul 20, 7:09 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 66 min |
| Jul 20, 7:15 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 60 min |
| Jul 20, 7:24 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 66 min |
| Jul 20, 7:25 PM MDT | Severe Thunderstorm Warning | GGW | Prairie | 65 min |
| Jul 20, 7:57 PM MDT | Tornado Warning | GGW | Dawson | 63 min |
| Jul 20, 8:14 PM MDT | Tornado Warning | GGW | Richland | 61 min |
| Jul 20, 8:30 PM MDT | Severe Thunderstorm Warning | GGW | Prairie | 60 min |
| Jul 20, 8:35 PM MDT | Flash Flood Warning | GGW | Dawson, Prairie | 6 hr |
| Jul 20, 9:27 PM MDT | Severe Thunderstorm Warning | GGW | Dawson | 63 min |
| Jul 20, 10:15 PM MDT | Severe Thunderstorm Warning | GGW | Wibaux | 60 min |
| Jul 21, 5:23 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 67 min |
Nearby
Tornado Warnings in Montana, 2001Every tornado warning in 2001Tornadoes 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.