Alert archive / Montana / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 1, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jun 15, 1987, 3:46 PM MDT for Fergus County, Montana. It was in force for 59 min.
The area
The counties it named.
The facts
- Issued
- Jun 15, 1987, 3:46 PM MDT (21:46 UTC)
- Expired
- Jun 15, 1987, 4:45 PM MDT
- In force
- 59 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
County Fergus 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
Great Falls, MT (KGTF), launched 12:00Z, 9.8 hours before the alert went out and 158 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3179 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 15, 2:24 PM MDT, 1 hour 22 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS, MT 218 PM MDT MON JUN 15 1987 ...STRONG THUNDERSTORMS FORMING IN EASTERN MONTANA THIS AFTERNOON... THUNDERSTORMS WITH GUSTY WINDS IN EXCESS OF 50 MPH HAVE BEEN REPORTED IN PORTIONS OF SOUTHWEST MONTANA EARLY THIS AFTERNOON. THESE THUNDERSTORMS ARE MOVING OUT INTO THE PLAINS OF EASTERN MONTANA AND WILL CAUSE LOCAL STRONG GUSTY WINDS AND POSSIBLE HAIL THIS AFTERNOON AND EVENING. CAUSE OF THESE THUNDERSTORMS ARE A COMBINATION OF INCREASING MOIST SOUTHERLY FLOW AND UNUSUALLY HOT TEMPERATURES OVER THE STATE. AS THE MOIST FLOW INCREASES LATER THIS AFTERNOON AND TONIGHT MORE THUNDERSTORMS WILL FORM OVER THE STATE WITH THE PROSPEC)T OF GUSTY WINDS...RAIN AND POSSIBLE HAIL. OLSEN
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 15, 5:20 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Teton | 100 min |
Nearby
Severe Thunderstorm Warnings in Montana, 1987Every severe thunderstorm warning in 1987
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.