Alert archive / Montana / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 3, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jul 2, 1990, 4:06 PM MDT for Cascade County, Montana. It was in force for 69 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 2, 1990, 4:06 PM MDT (22:06 UTC)
- Expired
- Jul 2, 1990, 5:15 PM MDT
- In force
- 69 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
County Cascade 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 2, 4:30 PM MDT | Thunderstorm Wind 75 | Cascade, 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 (KGTF), launched 12:00Z, 10.1 hours before the alert went out and 19 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
- 2690 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 72 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 022205 SVRGTF MTC013-022315- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 406 PM MDT MON JUL 2 1990 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 515 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATION...... IN NORTH CENTRAL MONTANA ...CASCADE COUNTY...INCLUDING THE CITY OF GREAT FALLS. RADAR INDICATES A LIKELY SEVERE THUNDERSTORM JUST ENTERING SOUTHWEST CASCADE COUNTY. THIS STORM IS MOVING NORTHEAST AT 45 MPH AND SHOULD HIT THE CITY OF GREAT FALLS IN 30 MIN. IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A STRONG BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN... AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
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, Jul 2, 3:28 PM MDT, 38 minutes before
MTZ006-022300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 330 PM MDT MON JUL 2 1990 STRONG THUNDERSTORMS ARE MOVING EASTWARD ACROSS WESTERN JUDITH BASIN COUNTY AT 330 PM MDT THGESE THUNDERSTORMS WILL MOST LIKELY CONTAIN GUSTY WINDS...SMALL HAIL AND BRIEF HEAVY RAINFALL. THESE THUNDERSTORMS WILL MOVE ACROSS STANFORD DURING THE NEXT HALF HOUR. SIMS
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 2, 4:23 PM MDT | Severe Thunderstorm Warning | TFX | Teton | 67 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.