Alert archive / Montana / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 280
The Storm Prediction Center issued this severe thunderstorm watch at May 19, 2007, 2:36 PM MDT for 24 counties in Montana. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 19, 2007, 2:36 PM MDT (20:36 UTC)
- Expired
- May 19, 2007, 10:00 PM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
All 24 counties
Big Horn County, MT, Broadwater County, MT, Carbon County, MT, Carter County, MT, Cascade County, MT, Chouteau County, MT, Custer County, MT, Fallon County, MT, Fergus County, MT, Gallatin County, MT, Garfield County, MT, Golden Valley County, MT, Judith Basin County, MT, Meagher County, MT, Musselshell County, MT, Park County, MT, Petroleum County, MT, Powder River County, MT, Rosebud County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Wheatland County, MT, Yellowstone County, MT
The radar
The Billings radar (KBLX), 113 km from the middle of the area, began a volume at 20:35 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.
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 4:23 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 35 min |
| May 19, 4:31 PM MDT | Severe Thunderstorm Warning | TFX | Fergus, Judith Basin | 44 min |
| May 19, 5:30 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley | 47 min |
| May 19, 6:08 PM MDT | Severe Thunderstorm Warning | BYZ | Rosebud | 67 min |
| May 19, 6:28 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 62 min |
| May 19, 6:46 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 59 min |
| May 19, 6:55 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell | 65 min |
| May 19, 7:13 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 47 min |
| May 19, 7:19 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 56 min |
| May 19, 7:26 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 35 min |
| May 19, 7:40 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 30 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 8.6 hours before the alert went out and 122 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
- 1650 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 74 m²/s²
- 0-3 km storm-relative helicity
- 123 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 1:41 PM MDT | Mesoscale Discussion | SPC | Big Horn, Broadwater, Carbon, Cascade, Fergus, Golden Valley and 12 more | 64 min |
| May 19, 5:43 PM MDT | Mesoscale Discussion | SPC | Big Horn, Carter, Custer, Fergus, Golden Valley, Judith Basin and 9 more | 92 min |
Nearby
Severe Thunderstorm Watches in Montana, 2007Every severe thunderstorm watch 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.