Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 183, NWS Glasgow, MT
NWS Glasgow, MT issued this severe thunderstorm warning at Aug 12, 2001, 6:15 PM MDT for Sheridan County, Montana. It was in force for 30 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
- Aug 12, 2001, 6:15 PM MDT (00:15 UTC)
- Expired
- Aug 12, 2001, 6:45 PM MDT
- In force
- 30 min
- Issued by
- NWS Glasgow, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Sheridan County, MT
The radar
The Glasgow radar (KGGW), 166 km from the middle of the area, began a volume at 00:17 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 nearest sounding before it
Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 0.3 hours before the alert went out and 164 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
- 298 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 2825 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 Aug 12, 2:10 PM MDT, 4 hours 5 minutes earlier.
Area forecast discussion, Aug 12, 2:10 PM MDT, 4 hours 5 minutes before
NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
210 PM MDT SUN AUG 12 2001
THERMAL RIDGE MOVING ACROSS MONTANA OVER THE NEXT TWO DAY FOR
CONTINUED HOT WEATHER. SHORTWAVE TROF LIFTING OUT OF GREAT BASIN
RESPONSIBLE FOR SHIFTING RIDGE AXIS EAST AND WILL ALSO BRING A
CHANCE OF THUNDERSTORMS TO THE REGION MAINLY MONDAY NIGHT AND
TUESDAY. MODELS COMING INTO AGREEMENT WITH SPLITTING THE WAVE AS IT
MOVES INTO IDAHO. A FEW TIMING DIFFERENCES BUT ONE PORTION SHEARS
EASTWARD ACROSS WYOMING UNDER THE RIDGE TONIGHT AND MONDAY. SECOND
PORTION OF WAVE MOVES NORTH THROUGH IDAHO UNTIL ENCOUNTERING STRONG
NORTHWESTERLY FLOW TO PUSH IT EAST ALONG INTERNATIONAL BORDER MONDAY
NIGHT AND TUESDAY. THIS SECOND WAVE WILL BRING COLD FRONT ACROSS
STATE TUESDAY PROVIDING FOCUS AND TRIGGER FOR THUNDERSTORMS. EBERT
EXTENDED...NW FLOW ALOFT OVER ERN MT WITH RIDGE AXIS NEAR
CONTINENTAL DIVIDE ON WED WILL TRANSITION TO RIDGING ALOFT OVER ERN
MT BY THE WEEKEND. 12Z AVN APPEARS TO BE SLOWER IN BRINGING THE
RIDGE EAST THAN THE 00Z MRF AND KEEPS ERN MT IN NW FLOW ALOFT INTO
FRI. WITH A GENERAL LACK OF SHORTWAVES THROUGH THE PERIOD...WILL
FORECAST DRY FOR THE ENTIRE EXTENDED. FORRESTER
KGGW 058/091 063/087 054/075 048/082 054/084 056/086 055/086
UTNBBBB 900133/7921122
KGDV 061/093 063/088 055/075 047/080 051/084 056/086 055/086
UTNBBBB 900133/7921111The office that day
Everything else NWS Glasgow, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 6:36 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 54 min |
| Aug 12, 7:31 PM MDT | Severe Thunderstorm Warning | GGW | Richland | 89 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.