Alert archive / Oklahoma / Mesoscale Discussions in 2009

Mesoscale Discussion 2154

October 29, 200914 counties in Oklahoma; 13 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 29, 2009, 5:31 AM CDT for 14 counties in Oklahoma; 13 counties in Texas. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Oct 29, 2009, 5:31 AM CDT (10:31 UTC)
Expired
Oct 29, 2009, 7:00 AM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 27 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Garvin County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Pontotoc County, OK, Stephens County, OK, Collin County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Hunt County, TX, Jack County, TX, Lamar County, TX, Montague County, TX, Rockwall County, TX, Tarrant County, TX, Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 135 km from the middle of the area, began a volume at 10:33 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 00:00Z, 10.5 hours before the alert went out and 106 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 00:00Z on 2009-10-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 947 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 00:00Z on 2009-10-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 484 square meters per square second.19395878Sfc1 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
947 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
602 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
484 m²/s²
0-3 km storm-relative helicity
599 m²/s²
Significant tornado parameter
3.4
Supercell composite
18.8

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
Oct 28, 7:12 PM CDTMesoscale DiscussionSPCBeaver, Ellis, Harmon, Roger Mills93 min
Oct 29, 1:07 AM CDTMesoscale DiscussionSPCCarter, Comanche, Cotton, Jefferson, Johnston, Love and 4 more53 min
Oct 29, 1:19 AM CDTTornado WatchSPCAtoka, Bryan, Carter, Choctaw, Coal, Garvin and 11 more6 hr
Oct 29, 1:59 AM CDTTornado WatchSPCBlaine, Caddo, Canadian, Cleveland, Comanche, Cotton and 13 more5 hr
Oct 29, 3:40 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Caddo, Canadian, Carter, Choctaw and 22 more95 min
Oct 29, 6:43 AM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Carter, Cherokee, Choctaw, Coal and 29 more5 hr
Oct 29, 10:02 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Cherokee, Choctaw, Coal, Craig and 21 more118 min
Oct 29, 11:51 AM CDTTornado WatchSPCAdair, Atoka, Bryan, Cherokee, Choctaw, Coal and 10 more6 hr
Oct 29, 1:57 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Choctaw, Haskell, Latimer, LeFlore and 6 more2 hr
Oct 29, 5:03 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Haskell, LeFlore, McCurtain, Muskogee and 1 more57 min
Oct 29, 5:19 AM CDTMesoscale DiscussionSPCAustin, Brazos, Burleson, Chambers, Fort Bend, Grimes and 13 more86 min
Oct 29, 10:48 AM CDTMesoscale DiscussionSPCAnderson, Angelina, Bell, Bosque, Brazos, Burleson and 65 more117 min
Oct 29, 1:14 PM CDTTornado WatchSPCAngelina, Bowie, Brazos, Burleson, Cass, Grimes and 23 more8 hr
Oct 29, 3:03 PM CDTMesoscale DiscussionSPCAngelina, Bowie, Camp, Cass, Cherokee, Gregg and 24 more117 min
Oct 29, 5:24 PM CDTMesoscale DiscussionSPCAngelina, Bowie, Brazos, Burleson, Cass, Grimes and 23 more66 min

Nearby

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