Alert archive / Idaho / Mesoscale Discussions in 2004

Mesoscale Discussion 741

May 18, 200415 counties in Idaho; 4 counties in Montana; Park County, Teton County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at May 18, 2004, 12:43 PM MDT for 15 counties in Idaho; 4 counties in Montana; Park County, Teton County, Wyoming. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 18, 2004, 12:43 PM MDT (18:43 UTC)
Expired: May 18, 2004, 2:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 21 counties

Bingham County, ID, Blaine County, ID, Bonneville County, ID, Butte County, ID, Camas County, ID, Clark County, ID, Custer County, ID, Elmore County, ID, Fremont County, ID, Gooding County, ID, Jefferson County, ID, Lincoln County, ID, Madison County, ID, Minidoka County, ID, Teton County, ID, Beaverhead County, MT, Gallatin County, MT, Madison County, MT, Park County, MT, Park County, WY, Teton County, WY

The radar

The Pocatello radar (KSFX), 113 km from the middle of the area, began a volume at 18:44 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

Riverton, WY (KRIW), launched 12:00Z, 6.7 hours before the alert went out and 369 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: 722 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 233 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
May 18, 1:17 PM MDT	Mesoscale Discussion	SPC	Albany, Big Horn, Campbell, Converse, Goshen, Hot Springs and 6 more	118 min

Nearby

Mesoscale Discussions in Idaho, 2004 Mesoscale Discussions in Montana, 2004 Mesoscale Discussions in Wyoming, 2004 Every mesoscale discussion in 2004

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.