Alert archive / Washington / Mesoscale Discussions in 2017

Mesoscale Discussion 1159

June 26, 20175 counties in Idaho; 4 counties in Montana; 8 counties in Washington

The Storm Prediction Center issued this mesoscale discussion at Jun 26, 2017, 5:26 PM PDT for 5 counties in Idaho; 4 counties in Montana; 8 counties in Washington. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jun 26, 2017, 5:26 PM PDT (00:26 UTC)
Expired: Jun 26, 2017, 6:30 PM PDT
In force: 64 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Benewah County, ID, Clearwater County, ID, Kootenai County, ID, Latah County, ID, Shoshone County, ID, Lake County, MT, Mineral County, MT, Missoula County, MT, Sanders County, MT, Adams County, WA, Benton County, WA, Columbia County, WA, Franklin County, WA, Garfield County, WA, Spokane County, WA, Walla Walla County, WA, Whitman County, WA

The radar

The Spokane radar (KOTX), 117 km from the middle of the area, began a volume at 00:28 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

Spokane, WA (KOTX), launched 00:00Z, 0.4 hours before the alert went out and 103 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: 490 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 2539 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 27, 12:21 PM PDT	Mesoscale Discussion	SPC	Bannock, Bear Lake, Bingham, Bonneville, Butte, Caribou and 6 more	84 min

Nearby

Mesoscale Discussions in Washington, 2017 Mesoscale Discussions in Idaho, 2017 Mesoscale Discussions in Montana, 2017 Every mesoscale discussion in 2017

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.