Alert archive / Idaho / Mesoscale Discussions in 2009

Mesoscale Discussion 689

May 3, 20094 states

The Storm Prediction Center issued this mesoscale discussion at May 3, 2009, 1:37 PM MDT for 4 states. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: May 3, 2009, 1:37 PM MDT (19:37 UTC)
Expired: May 3, 2009, 3:30 PM MDT
In force: 113 min
Issued by: the Storm Prediction Center

All 40 counties

Ada County, ID, Adams County, ID, Bannock County, ID, Bear Lake County, ID, Bingham County, ID, Blaine County, ID, Boise County, ID, Bonneville County, ID, Butte County, ID, Camas County, ID, Canyon County, ID, Caribou County, ID, Cassia County, ID, Clark County, ID, Custer County, ID, Elmore County, ID, Franklin County, ID, Fremont County, ID, Gem County, ID, Gooding County, ID, Jefferson County, ID, Jerome County, ID, Lemhi County, ID, Lincoln County, ID, Madison County, ID, Minidoka County, ID, Oneida County, ID, Owyhee County, ID, Payette County, ID, Power County, ID, Teton County, ID, Twin Falls County, ID, Valley County, ID, Washington County, ID, Beaverhead County, MT, Madison County, MT, Harney County, OR, Malheur County, OR, Box Elder County, UT, Cache County, UT

The radar

The Boise radar (KCBX), 55 km from the middle of the area, began a volume at 19:38 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 12:00Z, 7.6 hours before the alert went out and 57 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: 2 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 908 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 142 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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Nearby

Mesoscale Discussions in Idaho, 2009 Mesoscale Discussions in Montana, 2009 Mesoscale Discussions in Oregon, 2009 Every mesoscale discussion in 2009

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.