Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 71, NWS Glasgow, MT
NWS Glasgow, MT issued this severe thunderstorm warning at Jul 14, 2001, 7:45 PM MDT for Garfield County, Montana. It was in force for 60 min. 2 reports 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 14, 2001, 7:45 PM MDT (01:45 UTC)
- Expired
- Jul 14, 2001, 8:45 PM MDT
- In force
- 60 min
- Issued by
- NWS Glasgow, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Garfield County, MT
The radar
The Glasgow radar (KGGW), 107 km from the middle of the area, began a volume at 01:49 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 14, 7:50 PM MDT | Hail 1.25 | Cohagen, MT | |
| Jul 14, 7:50 PM MDT | Thunderstorm Wind 52 M | Cohagen, 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.
The nearest sounding before it
Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 1.8 hours before the alert went out and 109 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
- 434 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 2657 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 74 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.
NWS Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 14, 2:15 PM MDT, 5 hours 30 minutes earlier.
Area forecast discussion, Jul 14, 2:15 PM MDT, 5 hours 30 minutes before
NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
215 PM MDT SAT JUL 14 2001
ACTIVITY FIRING OVER THE EASTERN CWFA THIS AFTERNOON WITH AN EXITING
SHORTWAVE. THIS IS HELPING TAKE THE 65+ DEW POINTS EAST INTO THE
DAKOTA/S...HOWEVER 55-65 DEW POINTS REMAIN OVER THE REMAINDER OF THE
AREA. VIS SAT SHOWS CU BUILDING UP OVER THE HIGHER TRRN OF WESTERN
MT. SKC FROM GGW-JDN WEST THIS AFTERNOON ALLOWING FOR MAX HEATING
OVER THIS AREA.
IN THE WATER VAP WATCHING TWO SHORTWAVES MOVING INTO MT. THE
STRONGER WAVE IS OVER NE NV AND NW UT MOVING NNE SHOWING SOME
DEVELOPMENT OVER ID. THE ETA CONTINUES TO TAKE THIS WAVE NORTHWARD.
THE SECOND WAVE COMES IN TWO PARTS...THE FIRST PART SHOULD STAY JUST
NORTH OF THE INTERNATIONAL BORDER...HOWEVER THE SECOND HALF IS
MOVING THROUGH EASTERN WA. THIS WAVE IS PROGGED TO CONTINUE EASTWARD
WITH TIME. THE ETA HAS IT INTO THE WESTERN CWFA BY 03Z. WILL
CONTINUE THE CHC FOR TSRA THIS EVENING ACROSS THE AREA. WITH MAX
HEATING AND STILL A JUICY LOW LEVELS...700MB TEMPS UNDER
10C...CONVECTION IS STILL A GOOD POSSIBILITY OVER THE REGION. FOR
SVR SHEAR PROFILES ARE A BIT BETTER LOOKING AT THE 18Z
SOUNDING...HOWEVER BEST FORCING DOESN/T MOVE IN UNTIL SUNDAY AND
MONDAY. WILL NOT ADD SVR IN THE ZONES FOR THIS EVENING.
TONIGHT...DO NOT EXPECT ANY FOG SUNDAY MORNING...OUTSIDE OF RIVER
BOTTOMS IN MISSOURI AND MILK VALLEYS. FOR SUNDAY...ANOTHER DAY OF
SOUTHWEST FLOW AND SHORTWAVES...MAKES FOR SCT PM TSRA. MONDAY MORE
OF THE SAME.
ONLY CHANGE WILL BE TO TWEAK TEMPS DOWN SOME...WE SEEM TO BE
REACHING INTO THE MID TO UPPER 80S AREA WIDE. HAVEN/T BEEN ABLE TO
BREAK THE 90 MARK AS OF YET. WILL FORECAST TEMPS TOWARDS THE CURRENT
TRENDS ACROSS THE CWFA PROTON
EXTENDED...A STRONG UPPER LEVEL RIDGE REMAINS IN PLACE OVER THE
UPPER MIDWEST THROUGH FRIDAY WITH A DEEP TROUGH SITUATED ALONG THE
WEST COAST. THE UPPER TROUGH THEN EDGES INTO NORTHEAST MONTANA
SATURDAY AS AN UPPER LOW SLOWLY MOVES EAST ACROSS NORTHERN CANADA.
WILL KEEP CHANCE THUNDERSTORMS IN EACH DAY UNDER THIS FAST SOUTHWEST
FLOW ALOFT PATTERN. MODELS BRING A COLD FRONT THROUGH THE REGION
LATE WEDNESDAY FOR SLIGHTLY COOLER TEMPERATURES THURSDAY. WATERHOUSE
KGGW 062/085 062/085 062/087 062/087 060/083 058/083 058/083
TTTTTTT 943333/9933333
KGDV 062/088 062/088 062/089 062/089 060/084 059/084 059/084 5
TTTTTTT 943333/9933333
.GGW...NONE.The office that day
Everything else NWS Glasgow, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 6:45 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 60 min |
| Jul 14, 7:18 PM MDT | Flash Flood Warning | GGW | Garfield | 3 hr |
| Jul 15, 1:26 AM MDT | Flash Flood Warning | GGW | Richland | 3 hr |
| Jul 15, 5:11 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 64 min |
| Jul 15, 5:13 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 62 min |
| Jul 15, 5:53 PM MDT | Flash Flood Warning | GGW | Garfield | 3 hr |
Nearby
Severe Thunderstorm Warnings in Montana, 2001Every severe thunderstorm warning in 2001
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; radar from the NEXRAD Level II archive.