Alert archive / Montana / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 55, NWS Great Falls, MT

July 5, 2000Chouteau County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 5, 2000, 10:16 PM MDT for Chouteau County, Montana. It was in force for 29 min. No storm report in the archive falls 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.

The facts

Issued: Jul 5, 2000, 10:16 PM MDT (04:16 UTC)
Expired: Jul 5, 2000, 10:45 PM MDT
In force: 29 min
Issued by: NWS Great Falls, MT
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Chouteau County, MT

The radar

The Great Falls radar (KTFX), 121 km from the middle of the area, began a volume at 04:15 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.

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 4.3 hours before the alert went out and 248 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: 1390 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1773 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 4.6

Open this sounding in Storm Lab

The text

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

309 
WUUS55 KTFX 060416
SVRGTF
MTC015-060445-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
1016 PM MDT WED JUL 5 2000

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CHOUTEAU COUNTY IN NORTH CENTRAL MONTANA

* UNTIL 1045 PM MDT

* AT 1005 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 10 MILES WEST OF ILIAD...OR ABOUT 29 MILES
  SOUTH OF BIG SANDY...MOVING NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
RURAL EASTERN CHOUTEAU COUNTY AT 1030 PM MDT

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN GREAT FALLS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT MDT
THURSDAY MORNING FOR NORTHWESTERN MONTANA.

LAT...LON 4792 11016 4768 10995 4779 10958 4812 10962

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 Great Falls, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 5, 9:00 PM MDT, 1 hour 16 minutes earlier.

Area forecast discussion, Jul 5, 9:00 PM MDT, 1 hour 16 minutes before

SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREAT FALLS MT
900 PM MDT WED JUL 5 2000

WORKING SEVERE WEATHER TONIGHT...HAVE ALREADY UPDATED A NUMBER OF ZONES.
OARD

CCF NUMBERS
GTF WB 050/073 048/082 052 084621
CTB WB 045/070 045/078 048 084621
HLN WB 048/075 050/084 053 085621
BZN WB 048/076 050/084 050 085622
WEY WB 038/070 038/077 038 085622
DLN WB 045/075 047/083 049 085521
HVR WB 048/080 050/085 054 083631
LWT TB 048/075 050/081 050 085621

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 7:29 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Judith Basin	31 min
Jul 5, 8:09 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau	36 min
Jul 5, 8:16 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Meagher	29 min
Jul 5, 8:27 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Judith Basin	33 min
Jul 5, 8:43 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau	32 min
Jul 5, 8:50 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Judith Basin	25 min
Jul 5, 8:54 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	36 min
Jul 5, 9:11 PM MDT	Tornado Warning	TFX	Cascade, Judith Basin	34 min
Jul 5, 9:17 PM MDT	Severe Thunderstorm Warning	TFX	Blaine, Chouteau, Fergus	28 min
Jul 5, 9:39 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau	36 min
Jul 5, 9:44 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	31 min
Jul 5, 10:20 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	40 min
Jul 5, 10:46 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	59 min
Jul 5, 11:07 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	38 min
Jul 6, 5:03 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Meagher	42 min

Nearby

Severe Thunderstorm Warnings in Montana, 2000 Every severe thunderstorm warning in 2000

Sources

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