Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 211, NWS Billings, MT
NWS Billings, MT issued this severe thunderstorm warning at Jul 21, 2001, 10:32 PM MDT for Yellowstone County, Montana. It was in force for 58 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 21, 2001, 10:32 PM MDT (04:32 UTC)
- Expired
- Jul 21, 2001, 11:30 PM MDT
- In force
- 58 min
- Issued by
- NWS Billings, MT
- Area
- Whole counties
County Yellowstone County, MT
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 21, 10:50 PM MDT | Hail 0.75 | Billings, MT | |
| Jul 21, 10:58 PM MDT | Hail 0.88 | Billings, 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 21, 6:30 PM MDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Great_falls, MT (KTFX), launched 00:00Z, 4.5 hours before the alert went out and 245 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
- 33 J/kg
- Mixed-layer CIN
- -187 J/kg
- Mixed-layer LCL
- 2161 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -59 m²/s²
- 0-3 km storm-relative helicity
- -126 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 Billings, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 21, 8:43 PM MDT, 1 hour 49 minutes earlier.
Area forecast discussion, Jul 21, 8:43 PM MDT, 1 hour 49 minutes before
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</html>The office that day
Everything else NWS Billings, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 6:31 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 59 min |
| Jul 21, 6:48 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 57 min |
| Jul 21, 7:31 PM MDT | Severe Thunderstorm Warning | BYZ | Wheatland | 59 min |
| Jul 21, 7:50 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley | 25 min |
| Jul 21, 7:56 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 64 min |
| Jul 21, 8:18 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 57 min |
| Jul 21, 9:17 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 58 min |
| Jul 21, 10:14 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 61 min |
| Jul 21, 11:06 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Rosebud | 54 min |
| Jul 21, 11:25 PM MDT | Flash Flood Warning | BYZ | Yellowstone | 2 hr |
| Jul 21, 11:32 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 58 min |
| Jul 22, 12:07 AM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 53 min |
| Jul 22, 12:26 AM MDT | Severe Thunderstorm Warning | BYZ | Custer | 59 min |
| Jul 22, 1:20 AM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 55 min |
| Jul 22, 2:03 AM MDT | Severe Thunderstorm Warning | BYZ | Custer | 57 min |
| Jul 22, 2:56 AM MDT | Severe Thunderstorm Warning | BYZ | Custer | 64 min |
| Jul 22, 2:30 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 60 min |
| Jul 22, 3:20 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 55 min |
| Jul 22, 3:22 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Treasure | 53 min |
| Jul 22, 4:04 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 86 min |
| Jul 22, 4:11 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 64 min |
| Jul 22, 4:31 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 89 min |
| Jul 22, 5:29 PM MDT | Severe Thunderstorm Warning | BYZ | Carter | 91 min |
| Jul 22, 5:56 PM MDT | Severe Thunderstorm Warning | BYZ | Fallon | 64 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.