Alert archive / Montana / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 113, NWS Great Falls, MT

September 5, 2000Cascade County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Sep 5, 2000, 4:12 PM MDT for Cascade County, Montana. It was in force for 48 min. 3 reports 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
Sep 5, 2000, 4:12 PM MDT (22:12 UTC)
Expired
Sep 5, 2000, 5:00 PM MDT
In force
48 min
Issued by
NWS Great Falls, MT
Area
Whole counties

County Cascade County, MT

The radar

The Great Falls radar (KTFX), 17 km from the middle of the area, began a volume at 22:09 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

TimeReportWhereRemark
Sep 5, 4:30 PM MDTHail 0.75Great Falls, MT
Sep 5, 4:30 PM MDTHail 0.75Cascade, MT
Sep 5, 5:05 PM MDTHail 0.75Centerville, 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 nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 10.2 hours before the alert went out and 382 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-pSkew-T log-p diagram, Spokane, WA at 12:00Z on 2000-09-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Spokane, WA at 12:00Z on 2000-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1123 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
-8 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 
WUUS55 KTFX 052215
SVRGTF
MTC013-052300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING...LARGE HAIL POSSIBLE
NATIONAL WEATHER SERVICE GREAT FALLS MT
412 PM MDT TUE SEP 5 2000

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL CASCADE COUNTY IN CENTRAL MONTANA

* UNTIL 500 PM MDT

* AT 410 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER EXTREME SOUTHWESTERN CASCADE COUNTY...OR
  ABOUT 20 MILES SOUTH OF CASCADE...MOVING NORTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL REMAIN OVER...
  RURAL AREAS OF SOUTH CENTRAL CASCADE COUNTY

VERY LARGE HAIL...ALONG WITH BRIEF HEAVY DOWNPOURS...IS POSSIBLE
WITH THIS SEVERE THUNDERSTORM. IF YOU ARE IN THE PATH OF THE
STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A SUBSTANTIAL SHELTER.

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

$$
LAT...LON 4704 11177 4696 11169 4714 11131 4728 11152
JOHNSON

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 4, 10:49 PM MDTSevere Thunderstorm WarningTFXChouteau26 min
Sep 4, 11:14 PM MDTSevere Thunderstorm WarningTFXChouteau31 min
Sep 4, 11:44 PM MDTSevere Thunderstorm WarningTFXBlaine, Chouteau46 min
Sep 5, 12:12 AM MDTSevere Thunderstorm WarningTFXCascade33 min
Sep 5, 3:52 PM MDTSevere Thunderstorm WarningTFXCascade, Lewis and Clark38 min
Sep 5, 3:55 PM MDTSevere Thunderstorm WarningTFXChouteau50 min
Sep 5, 4:58 PM MDTSevere Thunderstorm WarningTFXCascade47 min
Sep 5, 5:35 PM MDTSevere Thunderstorm WarningTFXChouteau40 min

Nearby

Severe Thunderstorm Warnings in Montana, 2000Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.