Alert archive / Montana / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 21, NWS Billings, MT
NWS Billings, MT issued this severe thunderstorm warning at Jul 15, 1986, 5:04 PM MDT for Golden Valley County, Stillwater County, Sweet Grass County, Montana. It was in force for 56 min. 1 report 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
- Jul 15, 1986, 5:04 PM MDT (23:04 UTC)
- Expired
- Jul 15, 1986, 6:00 PM MDT
- In force
- 56 min
- Issued by
- NWS Billings, MT
- Area
- Whole counties
Counties Golden Valley County, MT, Stillwater County, MT, Sweet Grass County, MT
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 15, 5:35 PM MDT | Thunderstorm Wind 56 | Stillwater, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 11.1 hours before the alert went out and 187 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
- 3577 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 117 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 KBIL 152305 SVRBIL MTC037-095-097-160000- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE BILLINGS MT 504 PM MDT TUE JUL 15 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 600 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF MONTANA...SOUTHERN GOLDEN VALLEY...NORTHERN STILLWATER AND EASTERN SWEET GRASS. AT 5 PM MDT RADAR INDICATED A SEVERE THUNDERSTORM 15 MILES EAST OF BIG TIMBER...IN SWEETGRASS COUNTY. THIS THUNDERSTORM WAS MOVING EAST AT 35 MPH. HAIL AND VERY HEAVY RAIN HAVE BEEN REPORTED WITH THIS STORM. IF THREATENING WEATHER APPROACHES...TAKE COVER IMMEDIATELY. IF THREATENING WEATHER APPROACHES GO TO A SAFE PLACE IMMEDIATELY. WHEN IT IS SAFE PLEASE ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR SEVERE WEATHER REPORTS TO THE NEAREST NATIONAL WEATHER SERVICE OFFICE, OR CALL THE NATIONAL WEATHER SERVICE AT BILLINGS MONTANA. 406-657-6988 END/DRN
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
Local storm report, Jul 15, 4:49 PM MDT, 15 minutes before
^GTFLSRBIL
STORM REPORT
NATIONAL WEATHER SERVICE BILLINGS MT
445 PM MDT TUE JUL 15 1986
TIME OF OCCURRENCE EVENT
437 PM MDT HAIL SLIGHTLY LARGER THAN MARBLE SIZE...VERY
HEAVY RAIN AT BIG TIMBER MONTANA...SWEETGRASS
COUNTY. HAIL COMPLETELY COVERED THE GROUND...
HAILED FOR ABOUT 10 MINUTES. REPORTED BY THE
SHERIFFS OFFICE IN BIG TIMBER.
END/NOLLThe office that day
Everything else NWS Billings, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 4:14 PM MDT | Severe Thunderstorm Warning | BYZ | Sweet Grass | 46 min |
Nearby
Severe Thunderstorm Warnings in Montana, 1986Every severe thunderstorm warning in 1986
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.