Alert archive / Texas / Mesoscale Discussions in 2009

Mesoscale Discussion 1077

June 12, 200921 counties in Oklahoma; 25 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 12, 2009, 2:16 PM CDT for 21 counties in Oklahoma; 25 counties in Texas. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Jun 12, 2009, 2:16 PM CDT (19:16 UTC)
Expired
Jun 12, 2009, 3:45 PM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 46 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Brown County, TX, Callahan County, TX, Clay County, TX, Coleman County, TX, Comanche County, TX, Cooke County, TX, Denton County, TX, Eastland County, TX, Grayson County, TX, Jack County, TX, Kerr County, TX, Mason County, TX, McCulloch County, TX, Mills County, TX, Montague County, TX, Palo Pinto County, TX, San Saba County, TX, Shackelford County, TX, Stephens County, TX, Throckmorton County, TX, Wichita County, TX, Wise County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 80 km from the middle of the area, began a volume at 19:14 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, 7.3 hours before the alert went out and 82 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-pSkew-T log-p diagram, Fort Worth, TX at 12:00Z on 2009-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2338 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 12:00Z on 2009-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 272 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2338 J/kg
Mixed-layer CIN
-263 J/kg
Mixed-layer LCL
717 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
272 m²/s²
0-3 km storm-relative helicity
254 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.3

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.

IssuedProductOfficeCountiesLasted
Jun 12, 1:01 AM CDTMesoscale DiscussionSPCAlfalfa, Garfield, Grant, Harper, Kay, Major and 4 more89 min
Jun 12, 2:04 AM CDTSevere Thunderstorm WatchSPCAlfalfa, Garfield, Grant, Harper, Kay, Noble and 4 more6 hr
Jun 12, 6:23 AM CDTMesoscale DiscussionSPCAdair, Alfalfa, Cherokee, Craig, Creek, Delaware and 24 more67 min
Jun 12, 7:46 AM CDTSevere Thunderstorm WatchSPCAdair, Cherokee, Craig, Creek, Delaware, Garfield and 27 more7 hr
Jun 12, 10:03 AM CDTMesoscale DiscussionSPCAdair, Cherokee, Delaware, Haskell, LeFlore, Muskogee and 1 more87 min
Jun 12, 11:01 AM CDTMesoscale DiscussionSPCAdair, Cherokee, Craig, Creek, Delaware, Haskell and 19 more89 min
Jun 12, 11:35 AM CDTSevere Thunderstorm Watch PDSSPCAdair, Cherokee, Haskell, Latimer, LeFlore, McIntosh and 3 more9 hr
Jun 12, 1:30 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Haskell, LeFlore, Sequoyah90 min
Jun 12, 3:29 PM CDTTornado WatchSPCCarter, Cotton, Jefferson, Love9 hr
Jun 12, 6:50 PM CDTMesoscale DiscussionSPCAtoka, Blaine, Bryan, Caddo, Canadian, Carter and 27 more55 min
Jun 11, 7:42 PM CDTMesoscale DiscussionSPCBell, Blanco, Brown, Burnet, Callahan, Coleman and 28 more63 min
Jun 11, 9:53 PM CDTMesoscale DiscussionSPCBastrop, Bell, Blanco, Burleson, Burnet, Caldwell and 12 more67 min
Jun 11, 10:16 PM CDTSevere Thunderstorm WatchSPCBastrop, Bell, Blanco, Brown, Burnet, Caldwell and 20 more3 hr
Jun 12, 6:10 PM CDTMesoscale DiscussionSPCBosque, Brown, Burnet, Clay, Comanche, Cooke and 21 more65 min

Nearby

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