Alert archive / Idaho / Mesoscale Discussions in 2006

Mesoscale Discussion 901

May 19, 20064 states

The Storm Prediction Center issued this mesoscale discussion at May 19, 2006, 6:47 PM MDT for 4 states. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: May 19, 2006, 6:47 PM MDT (00:47 UTC)
Expired: May 19, 2006, 8:15 PM MDT
In force: 88 min
Issued by: the Storm Prediction Center

All 32 counties

Ada County, ID, Adams County, ID, Benewah County, ID, Boise County, ID, Camas County, ID, Canyon County, ID, Clearwater County, ID, Custer County, ID, Elmore County, ID, Gem County, ID, Idaho County, ID, Kootenai County, ID, Latah County, ID, Lewis County, ID, Nez Perce County, ID, Payette County, ID, Shoshone County, ID, Valley County, ID, Washington County, ID, Mineral County, MT, Sanders County, MT, Baker County, OR, Grant County, OR, Umatilla County, OR, Union County, OR, Wallowa County, OR, Asotin County, WA, Columbia County, WA, Franklin County, WA, Garfield County, WA, Walla Walla County, WA, Whitman County, WA

The radar

The Missoula radar (KMSX), 211 km from the middle of the area, began a volume at 00:46 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

Boise Airport, ID (KBOI), launched 00:00Z, 0.8 hours before the alert went out and 229 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: 501 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 2926 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 20, 3:42 PM MDT	Mesoscale Discussion	SPC	Bannock, Bear Lake, Bonneville, Caribou, Cassia, Franklin and 3 more	2 hr
May 20, 11:42 AM MDT	Mesoscale Discussion	SPC	Big Horn, Broadwater, Carbon, Cascade, Chouteau, Fergus and 16 more	2 hr
May 20, 12:24 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Broadwater, Carbon, Cascade, Chouteau, Fergus and 16 more	8 hr
May 20, 2:53 PM MDT	Mesoscale Discussion	SPC	Big Horn, Broadwater, Carbon, Cascade, Fergus, Gallatin and 13 more	2 hr

Nearby

Mesoscale Discussions in Idaho, 2006 Mesoscale Discussions in Washington, 2006 Mesoscale Discussions in Oregon, 2006 Every mesoscale discussion in 2006

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.