Alert archive / Oklahoma / Mesoscale Discussions in 2006

Mesoscale Discussion 707

April 30, 200611 counties in Arkansas; McDonald County, Missouri; 18 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2006, 9:40 PM CDT for 11 counties in Arkansas; McDonald County, Missouri; 18 counties in Oklahoma. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Apr 30, 2006, 9:40 PM CDT (02:40 UTC)
Expired: Apr 30, 2006, 11:15 PM CDT
In force: 95 min
Issued by: the Storm Prediction Center

All 30 counties

Benton County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Newton County, AR, Pope County, AR, Washington County, AR, McDonald County, MO, Adair County, OK, Cherokee County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Mayes County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 69 km from the middle of the area, began a volume at 02:41 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

Springfield, MO (KSGF), launched 00:00Z, 2.7 hours before the alert went out and 140 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: 255 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1790 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

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
Apr 30, 7:40 PM CDT	Severe Thunderstorm Watch	SPC	Benton, Boone, Carroll, Crawford, Franklin, Johnson and 7 more	4 hr
May 1, 2:22 PM CDT	Mesoscale Discussion	SPC	Clay, Randolph	53 min
May 1, 4:17 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Crawford, Madison, Washington	118 min
May 1, 5:17 PM CDT	Tornado Watch	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 11 more	7 hr
May 1, 6:59 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Crawford, Franklin and 8 more	91 min
Apr 30, 7:45 PM CDT	Mesoscale Discussion	SPC	Dunklin, Mississippi, New Madrid, Pemiscot, Scott	60 min
May 1, 4:42 PM CDT	Severe Thunderstorm Watch	SPC	Carter, Cotton, Garvin, Jefferson, Love, Murray and 1 more	6 hr

Nearby

Mesoscale Discussions in Oklahoma, 2006 Mesoscale Discussions in Arkansas, 2006 Mesoscale Discussions in Missouri, 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.