Alert archive / Montana / Special Weather Statements in 2021
Special Weather Statement, NWS Great Falls, MT
NWS Great Falls, MT issued this special weather statement at Jul 28, 2021, 1:52 PM MDT for Beaverhead County, Montana. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 28, 2021, 1:52 PM MDT (19:52 UTC)
- Expired
- Jul 28, 2021, 2:30 PM MDT
- In force
- 38 min
- Issued by
- NWS Great Falls, MT
County Beaverhead County, MT
The radar
The Pocatello radar (KSFX), 191 km from the middle of the area, began a volume at 19:53 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
Spokane, WA (KOTX), launched 12:00Z, 7.9 hours before the alert went out and 411 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
- 1933 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 138 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Great Falls, MT wrote its last area forecast discussion before this special weather statement went out at Jul 28, 11:59 AM MDT, 1 hour 53 minutes earlier.
Area forecast discussion, Jul 28, 11:59 AM MDT, 1 hour 53 minutes before
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</html>In the hours before
Special weather statement, Jul 28, 10:35 AM MDT, 3 hours 17 minutes before
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</html>Special weather statement, Jul 28, 1:52 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Great Falls MT
152 PM MDT Wed Jul 28 2021
MTZ008-282030-
Beaverhead-
152 PM MDT Wed Jul 28 2021
...A DEVELOPING THUNDERSTORM MAY IMPACT SOUTH CENTRAL BEAVERHEAD
COUNTY...
At 149 PM MDT, a thunderstorm was in the process of developing 15
miles northeast of Leadore, or 36 miles southwest of Dillon, moving
northeast at 15 mph.
Winds in excess of 40 mph are possible along with an occasional
lightning strike.
Locations impacted include...
Grant.
This includes Interstate 15 between mile markers 35 and 41.
LAT...LON 4470 11310 4476 11313 4477 11313 4478 11317
4482 11323 4507 11306 4491 11274 4469 11308
TIME...MOT...LOC 1949Z 214DEG 12KT 4481 11309
HARTThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 6:14 PM MDT | Special Weather Statement | TFX | Glacier, Pondera | 31 min |
| Jul 27, 6:23 PM MDT | Special Weather Statement | TFX | Teton | 22 min |
| Jul 27, 6:53 PM MDT | Special Weather Statement | TFX | Teton | 22 min |
| Jul 27, 9:02 PM MDT | Special Weather Statement | TFX | Glacier, Pondera | 28 min |
| Jul 28, 3:08 PM MDT | Special Weather Statement | TFX | Beaverhead | 37 min |
Nearby
Special Weather Statements in Montana, 2021Every special weather statement in 2021
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.