Alert archive / Montana / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 129, NWS Glasgow, MT
NWS Glasgow, MT issued this severe thunderstorm warning at Aug 21, 2002, 2:19 AM MDT for McCone County, Valley County, Montana. It was in force for 56 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 21, 2002, 2:19 AM MDT (08:19 UTC)
- Expired
- Aug 21, 2002, 3:15 AM MDT
- In force
- 56 min
- Issued by
- NWS Glasgow, MT
- Area
- Whole counties
Counties McCone County, MT, Valley County, MT
The radar
The Glasgow radar (KGGW), 37 km from the middle of the area, began a volume at 08:18 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, 8.3 hours before the alert went out and 36 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
- 41 J/kg
- Mixed-layer CIN
- -403 J/kg
- Mixed-layer LCL
- 2487 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 182 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 20, 8:45 PM MDT, 5 hours 34 minutes earlier.
Area forecast discussion, Aug 20, 8:45 PM MDT, 5 hours 34 minutes before
NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
845 PM MDT TUE AUG 20 2002
.SHORT TERM...
WILL INCREASE POPS TO SEVERAL WESTERN COUNTIES FOR TONIGHT.
THUNDERSTORM CLUSTER ROLLING EAST THROUGH CENTRAL MT BEING WATCHED THIS
EVENING. THIS AREA IS NOT MOVING ALL THAT FAST (ABOUT 20-25 MPH)...AND
AM NOT CONFIDENT THAT IT WILL MAKE MUCH HEADWAY EAST INTO NE MT
OVERNIGHT. WILL BUMP UP POPS OVER SOME OF THE WESTERN ZONES
(PHILLIPS/GARFIELD AND PETROLEUM) TO 40 PERCENT...BUT LEAVE 20 PERCENTS
FOR THE REMAINDER OF THE CWA. JAMBA
.LONG TERM...
MED RANGE MODELS IN SOME DISAGREEMENT ON SOLUTION THROUGH EXTENDED
PERIOD BUT GENERAL TREND IS TO DEVELOP OMEGA BLOCK TYPE PATTERN
WITH UPPER LOW OVER PACIFIC NORTHWEST AND RIDGE OVER CENTRAL CANADA.
WILL KEEP CHANCE POPS WITH PROXIMITY OF UPPER LOW AND DIFFLUENT
FLOW. EBERT
KGGW TBB 057/080 055/082 058/081 90243111
BBBB 051/081 050/084 051/081 052/083 9011333333
KGDV TBB 057/082 058/084 058/084 90243111
BBBB 052/082 050/083 050/082 051/084 9012333333
.GGW...NONE.The office that day
Everything else NWS Glasgow, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 11:23 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 52 min |
| Aug 21, 12:18 AM MDT | Severe Thunderstorm Warning | GGW | Valley | 57 min |
| Aug 21, 12:35 AM MDT | Flash Flood Warning | GGW | Valley | 6 hr |
| Aug 21, 1:19 AM MDT | Severe Thunderstorm Warning | GGW | Valley | 56 min |
| Aug 21, 2:44 AM MDT | Flash Flood Warning | GGW | McCone | 6 hr |
| Aug 21, 4:53 AM MDT | Severe Thunderstorm Warning | GGW | McCone | 67 min |
| Aug 21, 10:20 AM MDT | Flash Flood Warning | GGW | Valley | 6 hr |
Nearby
Severe Thunderstorm Warnings in Montana, 2002Every severe thunderstorm warning in 2002
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.