Alert archive / Montana / Mesoscale Discussions in 2003

Mesoscale Discussion 2107

August 6, 2003Clearwater County, Idaho County, Lemhi County, Idaho; 11 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2003, 12:10 PM PDT for Clearwater County, Idaho County, Lemhi County, Idaho; 11 counties in Montana. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Aug 6, 2003, 12:10 PM PDT (19:10 UTC)
Expired: Aug 6, 2003, 2:45 PM PDT
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Clearwater County, ID, Idaho County, ID, Lemhi County, ID, Deer Lodge County, MT, Granite County, MT, Jefferson County, MT, Lake County, MT, Lewis and Clark County, MT, Mineral County, MT, Missoula County, MT, Powell County, MT, Ravalli County, MT, Silver Bow County, MT, Teton County, MT

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 846Aug 6, 1:10 PM PDT

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 7.2 hours before the alert went out and 220 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2065 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 6, 1:10 PM PDT	Severe Thunderstorm Watch	SPC	Idaho	7 hr
Aug 6, 4:41 PM PDT	Mesoscale Discussion	SPC	Idaho	2 hr
Aug 6, 3:27 PM PDT	Mesoscale Discussion	SPC	Blaine, Daniels, Dawson, Garfield, McCone, Phillips and 4 more	2 hr
Aug 6, 3:50 PM PDT	Severe Thunderstorm Watch	SPC	Blaine, Broadwater, Fergus, Golden Valley, Judith Basin, Meagher and 4 more	5 hr

Nearby

Mesoscale Discussions in Montana, 2003 Mesoscale Discussions in Idaho, 2003 Every 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.