Alert archive / Texas / Mesoscale Discussions in 2009

Mesoscale Discussion 90

February 10, 20097 counties in Oklahoma; 10 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 10, 2009, 7:18 PM CST for 7 counties in Oklahoma; 10 counties in Texas. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Feb 10, 2009, 7:18 PM CST (01:18 UTC)
Expired: Feb 10, 2009, 8:15 PM CST
In force: 57 min
Issued by: the Storm Prediction Center

Counties Carter County, OK, Cleveland County, OK, Garvin County, OK, Jefferson County, OK, Lincoln County, OK, McClain County, OK, Pottawatomie County, OK, Brown County, TX, Comanche County, TX, Eastland County, TX, Erath County, TX, Jack County, TX, McCulloch County, TX, Mills County, TX, Montague County, TX, Palo Pinto County, TX, San Saba County, TX

The radar

The Altus AFB radar (KFDR), 133 km from the middle of the area, began a volume at 01:18 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

Fort Worth, TX (KFWD), launched 00:00Z, 1.3 hours before the alert went out and 114 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: 1515 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 763 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 302 m²/s²
0-3 km storm-relative helicity: 287 m²/s²
Significant tornado parameter: 2.9
Supercell composite: 10.9

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
Feb 10, 6:13 PM CST	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Cleveland and 36 more	92 min
Feb 10, 8:34 PM CST	Mesoscale Discussion	SPC	Choctaw, Haskell, Latimer, LeFlore, McCurtain, Pushmataha and 1 more	86 min
Feb 10, 9:30 PM CST	Tornado Watch	SPC	Adair, Cherokee, Choctaw, Haskell, Latimer, LeFlore and 6 more	7 hr
Feb 10, 9:46 PM CST	Mesoscale Discussion	SPC	Austin, Brazoria, Calhoun, Chambers, Colorado, DeWitt and 13 more	29 min
Feb 10, 9:57 PM CST	Severe Thunderstorm Watch	SPC	Aransas, Austin, Bastrop, Bee, Brazoria, Caldwell and 25 more	5 hr
Feb 11, 1:04 AM CST	Tornado Watch	SPC	Hardin, Jasper, Newton, Sabine, Tyler	5 hr
Feb 11, 4:01 AM CST	Mesoscale Discussion	SPC	Hardin, Jasper, Newton, Polk, Sabine, San Augustine and 2 more	89 min

Nearby

Mesoscale Discussions in Texas, 2009 Mesoscale Discussions in Oklahoma, 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.