Alert archive / Montana / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 7, NWS Glasgow, MT
NWS Glasgow, MT issued this severe thunderstorm warning at Jun 27, 1990, 9:30 PM MDT for McCone County, Montana. It was in force for 30 min.
The area
The counties it named.
The facts
- Issued
- Jun 27, 1990, 9:30 PM MDT (03:30 UTC)
- Expired
- Jun 27, 1990, 10:00 PM MDT
- In force
- 30 min
- Issued by
- NWS Glasgow, MT
- Area
- Whole counties
County McCone County, MT
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 3.5 hours before the alert went out and 88 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
- 510 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 2784 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 100 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.7
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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.
In the hours before
Special weather statement, Jun 27, 6:30 PM MDT, 3 hours before
MTZ008-280020- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GLASGOW MT 620 PM MDT WED JUN 27 1990 THE SEVERE THUNDERSTORM WARNING FOR SHERIDAN COUNTY HAS EXPIRED HOWEVER...THE SEVERE THUNDERSTORM WATCH IS STILL IN EFFECT FOR NORTHEAST MONTANA UNTIL 11 PM MDT TONIGHT. WILLISTON RADAR INDICATES THAT THERE ARE STILL VERY STRONG THUNDERSTORMS 20 MILES SOUTHWEST OF PLENTYWOOD. THESE STORMS ARE MOVING TO THE EAST-NORTHEAST AT 25 MILES AN HOUR. BILLINGS RADAR ALSO INDICATES STRONG STORMS IN VALLEY...ROOSEVELT...DANIELS AND SHERIDAN COUNTIES. YOUR NATIONAL WEATHER SERVICE IS CONTINUOUSLY MONITORING THESE STORMS.
Special weather statement, Jun 27, 6:31 PM MDT, 2 hours 59 minutes before
MTZ008-280020- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GLASGOW MT 620 PM MDT WED JUN 27 1990 THE SEVERE THUNDERSTORM WARNING FOR SHERIDAN COUNTY HAS EXPIRED HOWEVER...THE SEVERE THUNDERSTORM WATCH IS STILL IN EFFECT FOR NORTHEAST MONTANA UNTIL 11 PM MDT TONIGHT. WILLISTON RADAR INDICATES THAT THERE ARE STILL VERY STRONG THUNDERSTORMS 20 MILES SOUTHWEST OF PLENTYWOOD. THESE STORMS ARE MOVING TO THE EAST-NORTHEAST AT 25 MILES AN HOUR. BILLINGS RADAR ALSO INDICATES STRONG STORMS IN VALLEY...ROOSEVELT...DANIELS AND SHERIDAN COUNTIES. YOUR NATIONAL WEATHER SERVICE IS CONTINUOUSLY MONITORING THESE STORMS. WALKER
The office that day
Everything else NWS Glasgow, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 27, 7:35 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 60 min |
| Jun 27, 8:05 PM MDT | Tornado Warning | GGW | Roosevelt | 55 min |
| Jun 27, 9:00 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 60 min |
| Jun 28, 5:15 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt | 60 min |
Nearby
Severe Thunderstorm Warnings in Montana, 1990Every severe thunderstorm warning in 1990
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.