Alert archive / Montana / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 2, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jun 15, 1987, 5:20 PM MDT for Cascade County, Teton County, Montana. It was in force for 100 min.
The area
The counties it named.
The facts
- Issued
- Jun 15, 1987, 5:20 PM MDT (23:20 UTC)
- Expired
- Jun 15, 1987, 7:00 PM MDT
- In force
- 100 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
Counties Cascade County, MT, Teton 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, 11.3 hours before the alert went out and 38 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
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KGTF 152319
SVRGTF
MTC013-099-160115-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
520 PM MDT MON JUN 15 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 700 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN MONTANA EAST OF THE DIVIDE
...CASCADE...TETON
ANOTHER LINE OF POSSIBLE SEVERE THUNDERSTORMS WILL MOVE INTO CASCADE
AND TETON COUNTIES BEFORE 6 PM MDT AND LAST ABOUT AN HOUR. WIND
GUSTS IN EXCESS OF 50 MPH ALONG WITH BRIEF HEAVY RAIN AND HAIL MAY
ACCOMPANY THIS NEW SURGE OF THUNDERSTORMS.
PERSONS IN CASCADE AND TETON COUNTIES SHOULD BE PREPARED FOR THE
STRONG WINDS...LIGHTNING AND HAIL UNTIL ABOUT 7PM MDT.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, 2 hours 56 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
Special weather statement, Jun 15, 3:51 PM MDT, 1 hour 29 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HAVRE MT 345 PM MDT MON JUN 15 1987 ...STRONG THUNDERSTROMS IN CENTRAL AND SOUTHWESTERN MONTANA... THE NATIONAL SEVERE STORMS FORECAST CENTER IN KANSAS CITY HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR SOUTHWESTERN MONTANA UNTIL 10:00PM MDT THIS EVENING. THUNDERSTORMS WITH HAIL AND STRONG GUSTY WINDS HAVE ALREADY OCCURRED IN THIS AREA. EARLIER DILLON REPORTED WIND GUSTS TO 55 MPH WITH UNCONFIRMED REPORTS OF 3/4" HAIL. LIVINGSTON HAD WINDS GUSTS TO 61 MPH AS A THUNDERSTORM PASSED THROUGH AND AT 3:30PM MDT THIS AFTERNOON GREAT FALLS REPORTED MODERATE RAIN SHOWERS AND WIND GUSTING TO 45 MPH. THESE THUNDERSTORMS ARE MOVING NORTHWARD AND SHOULD BE IN NORTH- CENTRAL MONTANA WITHIN THE NEXT FEW HOURS. NORTH-CENTRAL MONTANA ,CAN EXPECT BRIEF HEAVY RAIN AND STRONG GUSTY WINDS WITH A FEW OF THESE STORM CELLS. /CORP/
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 15, 3:46 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 59 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.