Alert archive / Montana / Mesoscale Discussions in 2003
Mesoscale Discussion 1117
The Storm Prediction Center issued this mesoscale discussion at May 25, 2003, 1:28 PM MDT for Lemhi County, Idaho; 28 counties in Montana; 6 counties in Wyoming. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- May 25, 2003, 1:28 PM MDT (19:28 UTC)
- Expired
- May 25, 2003, 4:00 PM MDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm potential
All 35 counties
Lemhi County, ID, Beaverhead County, MT, Big Horn County, MT, Broadwater County, MT, Carbon County, MT, Cascade County, MT, Deer Lodge County, MT, Fergus County, MT, Gallatin County, MT, Golden Valley County, MT, Granite County, MT, Jefferson County, MT, Judith Basin County, MT, Lake County, MT, Lewis and Clark County, MT, Madison County, MT, Meagher County, MT, Missoula County, MT, Musselshell County, MT, Park County, MT, Pondera County, MT, Powell County, MT, Ravalli County, MT, Silver Bow County, MT, Stillwater County, MT, Sweet Grass County, MT, Teton County, MT, Wheatland County, MT, Yellowstone County, MT, Big Horn County, WY, Hot Springs County, WY, Johnson County, WY, Park County, WY, Sheridan County, WY, Washakie County, WY
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 7.5 hours before the alert went out and 238 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
- 42 J/kg
- Mixed-layer CIN
- -374 J/kg
- Mixed-layer LCL
- 2151 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- 17 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 |
|---|---|---|---|---|
| May 25, 3:00 PM MDT | Severe Thunderstorm Watch | SPC | Broadwater, Cascade, Chouteau, Flathead, Glacier, Judith Basin and 9 more | 5 hr |
| May 25, 5:13 PM MDT | Mesoscale Discussion | SPC | Broadwater, Cascade, Deer Lodge, Gallatin, Granite, Jefferson and 8 more | 92 min |
Nearby
Mesoscale Discussions in Montana, 2003Mesoscale Discussions in Wyoming, 2003Mesoscale Discussions in Idaho, 2003Every mesoscale discussion in 2003
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.