Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 103, NWS Glasgow, MT
NWS Glasgow, MT issued this severe thunderstorm warning at Jul 20, 2001, 1:15 PM MDT for Valley County, Montana. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 20, 2001, 1:15 PM MDT (19:15 UTC)
- Expired
- Jul 20, 2001, 2:15 PM MDT
- In force
- 60 min
- Issued by
- NWS Glasgow, MT
- Area
- Whole counties
County Valley County, MT
The radar
The Glasgow radar (KGGW), 18 km from the middle of the area, began a volume at 19:14 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 20, 12:30 PM MDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 7.3 hours before the alert went out and 17 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
- 28 J/kg
- Mixed-layer CIN
- -349 J/kg
- Mixed-layer LCL
- 2123 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 133 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 20, 9:00 AM MDT, 4 hours 15 minutes earlier.
Area forecast discussion, Jul 20, 9:00 AM MDT, 4 hours 15 minutes before
NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
900 AM MDT FRI JUL 20 2001
...NO CHANGES TO CURRENT FORECAST...
STORMS ARE STARTING EARLY AGAIN TODAY AGAIN WITH SEVERE WEATHER
PARAMETERS IN PLACE AS WELL. NEW ETA 500MB VORT PATTERN INDICATING THIS
FIRST ROUND WILL GO THROUGH HERE OVER THE NEXT 2 TO 4 HOURS...WITH MAYBE
A RE-FIRE LATER IN THE AFTERNOON/EVENING. SPC/S MODERATE RISK LOOKS
GOOD. A SPECIAL WEATHER STATEMENT HAS BEEN ISSUED IN ANTICIPATION
OF THE VOLATILE CONDITIONS EXPECTED FOR TODAY. JAMBA
EXTENDED...MID RANGE MODELS SUGGESTING SLIGHT SHIFT IN PATTERN WITH
BASE OF PACIFIC TROF CUTTING OFF AND FLOW ACROSS NORTHERN TIER OF
STATE BECOMING MORE ZONAL UNDER OMEGA BLOCK OVER CANADA. WITH FLOW
TURNING WEST SHOULD CUT OFF MOISTURE FEED OVER THE MOUNTAINS FOR
DRIER PATTERN FOR EASTERN MONTANA BY MID WEEK. ONLY CHANGE TO
EXTENDED WILL BE TO ADD SATURDAY NIGHT PERIOD TO EMPHASIZE CHANGE OF
THUNDERSTORMS THAT NIGHT. EBERT
KGGW /083 062/088 064/085 057/082 058/083 058/083 058/084
TTTTTBT 90543/9033323
KGDV /085 065/089 064/085 060/084 060/084 060/084 057/085
TTTTTBT 90543/9033323In the hours before
Special weather statement, Jul 20, 8:40 AM MDT, 4 hours 35 minutes before
MTZ016>027-059>062-202200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GLASGOW MT 840 AM MDT FRI JUL 20 2001 ...A GOOD CHANCE OF SEVERE WEATHER ACROSS NORTHEAST MONTANA TODAY... A MOIST...UNSTABLE AIRMASS IN PLACE ACROSS NORTHEAST MONTANA COMBINED WITH AN UPPER LEVEL DISTURBANCE PUSHING ACROSS THE AREA TODAY WILL BRING THUNDERSTORMS...SOME OF THEM SEVERE. ANY SEVERE THUNDERSTORM WILL BRING LARGE HAIL...DAMAGING WINDS AND TORRENTIAL RAIN. THE SEVERE THUNDERSTORM POTENTIAL STARTED THIS MORNING AND WILL LIKELY LAST INTO THE EVENING HOURS TONIGHT. ANYONE WITH OUTDOOR ACTIVITIES PLANNED TODAY SHOULD LISTEN TO NOAA WEATHER RADIO...OR ANOTHER MEDIA OUTLET...TO KEEP POST ED ON ANY WATCHES OR WARNINGS THAT MAY BE ISSUED TODAY. THIS INFORMATION CAN ALSO BE OBTAINED FROM OUR WEB SITE AT: HTTP://WWW.WRH.NOAA.GOV/GLASGOW TFJ
The office that day
Everything else NWS Glasgow, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 7:38 PM MDT | Tornado Warning | GGW | Wibaux | 67 min |
| Jul 20, 9:22 AM MDT | Severe Thunderstorm Warning | GGW | Phillips | 53 min |
| Jul 20, 11:47 AM MDT | Severe Thunderstorm Warning | GGW | Phillips | 58 min |
| Jul 20, 12:14 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 61 min |
| Jul 20, 12:53 PM MDT | Severe Thunderstorm Warning | GGW | Daniels, Roosevelt | 52 min |
| Jul 20, 1:14 PM MDT | Severe Thunderstorm Warning | GGW | Sheridan | 61 min |
| Jul 20, 2:49 PM MDT | Tornado Warning | GGW | Phillips | 56 min |
| Jul 20, 3:25 PM MDT | Tornado Warning | GGW | Valley | 65 min |
| Jul 20, 3:45 PM MDT | Tornado Warning | GGW | Phillips | 45 min |
| Jul 20, 4:30 PM MDT | Tornado Warning | GGW | Garfield, Valley | 60 min |
| Jul 20, 5:16 PM MDT | Tornado Warning | GGW | McCone | 59 min |
| Jul 20, 5:27 PM MDT | Tornado Warning | GGW | Daniels | 63 min |
| Jul 20, 5:30 PM MDT | Tornado Warning | GGW | Garfield | 60 min |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.