Alert archive / North Dakota / Mesoscale Discussions in 2007

Mesoscale Discussion 787

May 14, 200719 counties in North Dakota; McPherson County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 14, 2007, 1:08 AM CDT for 19 counties in North Dakota; McPherson County, South Dakota. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: May 14, 2007, 1:08 AM CDT (06:08 UTC)
Expired: May 14, 2007, 2:45 AM CDT
In force: 97 min
Issued by: the Storm Prediction Center

Counties Barnes County, ND, Benson County, ND, Dickey County, ND, Eddy County, ND, Foster County, ND, Griggs County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McHenry County, ND, McIntosh County, ND, Nelson County, ND, Pierce County, ND, Ramsey County, ND, Ransom County, ND, Sheridan County, ND, Steele County, ND, Stutsman County, ND, Wells County, ND, McPherson County, SD

The radar

The Bismarck radar (KBIS), 121 km from the middle of the area, began a volume at 06:11 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 watches that followed

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

Severe Thunderstorm Watch 270May 14, 1:55 AM CDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 6.1 hours before the alert went out and 117 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: 1399 J/kg
Mixed-layer CIN: -187 J/kg
Mixed-layer LCL: 1726 m above ground
0-6 km bulk shear: 0 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 0 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 13, 9:48 PM CDT	Mesoscale Discussion	SPC	Adams, Billings, Bowman, Dunn, Golden Valley, Grant and 11 more	87 min
May 13, 11:12 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Billings, Bowman, Burleigh, Dunn, Emmons and 15 more	4 hr
May 14, 1:54 AM CDT	Severe Thunderstorm Watch	SPC	Barnes, Benson, Burleigh, Cass, Dickey, Eddy and 19 more	4 hr
May 14, 4:31 AM CDT	Mesoscale Discussion	SPC	Barnes, Benson, Cavalier, Dickey, Eddy, Foster and 15 more	59 min

Nearby

Mesoscale Discussions in North Dakota, 2007 Mesoscale Discussions in South Dakota, 2007 Every mesoscale discussion in 2007

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.