Alert archive / Montana / Mesoscale Discussions in 2007
Mesoscale Discussion 1803
The Storm Prediction Center issued this mesoscale discussion at Aug 19, 2007, 12:31 PM MDT for 6 counties in Idaho; 12 counties in Montana; 4 counties in Wyoming. It was in force for 119 min.
The area
The outline as issued.
The facts
- Issued
- Aug 19, 2007, 12:31 PM MDT (18:31 UTC)
- Expired
- Aug 19, 2007, 2:30 PM MDT
- In force
- 119 min
- Issued by
- the Storm Prediction Center
All 22 counties
Bear Lake County, ID, Bonneville County, ID, Caribou County, ID, Fremont County, ID, Madison County, ID, Teton County, ID, Carbon County, MT, Fergus County, MT, Gallatin County, MT, Golden Valley County, MT, Judith Basin County, MT, Meagher County, MT, Musselshell County, MT, Park County, MT, Stillwater County, MT, Sweet Grass County, MT, Wheatland County, MT, Yellowstone County, MT, Lincoln County, WY, Park County, WY, Sublette County, WY, Teton County, WY
The radar
The Billings radar (KBLX), 162 km from the middle of the area, began a volume at 18:32 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 6.5 hours before the alert went out and 244 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
- 2424 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 133 m²/s²
- 0-3 km storm-relative helicity
- 108 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 1:36 PM MDT | Severe Thunderstorm Watch | SPC | Bannock, Bear Lake, Bingham, Bonneville, Caribou, Clark and 4 more | 6 hr |
| Aug 19, 5:01 PM MDT | Mesoscale Discussion | SPC | Carter, Custer, Fallon, Powder River, Rosebud | 89 min |
| Aug 19, 5:30 PM MDT | Severe Thunderstorm Watch | SPC | Carter, Custer, Fallon, Powder River, Rosebud, Treasure | 5 hr |
| Aug 18, 9:16 PM MDT | Mesoscale Discussion | SPC | Fremont, Johnson, Lincoln, Natrona, Sublette, Sweetwater and 2 more | 59 min |
Nearby
Mesoscale Discussions in Montana, 2007Mesoscale Discussions in Idaho, 2007Mesoscale Discussions in Wyoming, 2007Every mesoscale discussion in 2007
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.