Alert archive / Montana / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 9, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jul 6, 1990, 12:02 AM MDT for Blaine County, Montana. It was in force for 58 min.
The area
The counties it named.
The facts
- Issued
- Jul 6, 1990, 12:02 AM MDT (06:02 UTC)
- Expired
- Jul 6, 1990, 1:00 AM MDT
- In force
- 58 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
County Blaine 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, 6.0 hours before the alert went out and 176 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
- 2700 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- -19 m²/s²
- 0-3 km storm-relative helicity
- 226 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 060624 COR SVRGTF MTC005-071-060700- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT ISSUED BY GREAT FALLS MT 1202 AM MDT FRI JUL 6 1990 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 100 AM MDT FOR PEOPLE IN THE FOLLOWING LOCATION...... IN NORTH CENTRAL MONTANA ...BLAINE COUNTY...AND NORTHERN PHILLIPS COUNTY RADAR AND SATELLITE PICTURES INDICATE A LARGE SEVERE THUNDERSTORM MOVING INTO BLAINE AND PHILIPS COUNTY. THIS STORM IS MOVING EAST TO NORTHEAST AND ABOUT 25 MPH AND IS LIKELY TO PRODUCE LARGE HAIL...DAMAGING WINDS AND HEAVY RAIN. SEVERE THUNDERSTORMS CAN PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE WARNING. BE ON THE LOOKOUT AND TAKE COVER. EYSSAUTIER
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 5, 7:50 PM MDT, 4 hours 12 minutes before
MTC049-077-060345- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HELENA MT 749 PM MDT THU JUL 5 1990 ...CONTINUED THUNDERSTORM DEVELOPMENT IN HELENA NATIONAL FOREST AREA. AT 7:30 PM MDT, NATIONAL WEATHER SERVICE RADAR AND LIGHTNING DETECTION EQUIPTMENT HAS SHOWN INCREASED THUNDERSTORM ACTIVITY IN THE HELENA NATIONAL FOREST AREA, IN THE CENTRAL SECTIONS OF POWELL AND LEWIS & CLARK COUNTIES. THE STORMS HAVE BEEN DEVELOPING ALONG A LINE BETWEEN DRUMMOND AND GREAT FALLS AND ARE MOVING NORTHEAST. PEOPLE OUTDOORS IN THESE AREAS SHOULD BE AWARE OF IMPENDING STORM AND TAKE APPROPRIATE ACTION TO ENSURE PERSONAL SAFETY. REMEMBER STRONG SUDDEN WINDS, DANGEROUS LIGHTNING, AND HEAVY RAIN, AND HAIL AREA ALL POSSIBLE IN A THUNDERSTORM. THUNDERSTORM ACTIVITY WILL CONTINUE THROUGH THIS EVENING. END
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 8:39 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau | 66 min |
| Jul 5, 9:23 PM MDT | Tornado Warning | TFX | Cascade | 52 min |
| Jul 5, 9:54 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 66 min |
| Jul 5, 10:19 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 56 min |
| Jul 5, 10:56 PM MDT | Severe Thunderstorm Warning | TFX | Blaine, Hill | 64 min |
| Jul 6, 12:52 AM MDT | Severe Thunderstorm Warning | TFX | Blaine | 68 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.