Alert archive / Texas / Mesoscale Discussions in 2009

Mesoscale Discussion 84

February 10, 200918 counties in Oklahoma; 25 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 10, 2009, 2:16 PM CST for 18 counties in Oklahoma; 25 counties in Texas. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: Feb 10, 2009, 2:16 PM CST (20:16 UTC)
Expired: Feb 10, 2009, 4:15 PM CST
In force: 119 min
Issued by: the Storm Prediction Center

All 43 counties

Atoka County, OK, Bryan County, OK, Choctaw County, OK, Coal County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Marshall County, OK, McCurtain County, OK, McIntosh County, OK, Okfuskee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Seminole County, OK, Sequoyah County, OK, Camp County, TX, Collin County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Gregg County, TX, Henderson County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Morris County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 194 km from the middle of the area, began a volume at 20:17 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.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 8.3 hours before the alert went out and 177 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: 235 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 680 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.6

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
Feb 10, 12:17 PM CST	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Cleveland, Coal, Cotton and 20 more	118 min
Feb 10, 12:49 PM CST	Tornado Watch	SPC	Blaine, Caddo, Canadian, Carter, Cleveland, Comanche and 19 more	9 hr
Feb 10, 1:29 PM CST	Mesoscale Discussion	SPC	Kay, Noble, Nowata, Osage, Pawnee, Washington	2 hr
Feb 10, 2:33 PM CST	Mesoscale Discussion	SPC	Caddo, Canadian, Carter, Cleveland, Comanche, Cotton and 13 more	87 min
Feb 10, 2:42 PM CST	Tornado Watch	SPC	Adair, Atoka, Bryan, Cherokee, Choctaw, Coal and 29 more	7 hr
Feb 10, 3:37 PM CST	Tornado Watch	SPC	McCurtain	6 hr
Feb 10, 5:25 PM CST	Mesoscale Discussion	SPC	McCurtain	65 min
Feb 10, 3:45 PM CST	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Comanche, Concho, Eastland and 16 more	90 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.