Alert archive / Texas / Mesoscale Discussions in 2008

Mesoscale Discussion 609

April 9, 200815 counties in Oklahoma; 32 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2008, 8:13 PM CDT for 15 counties in Oklahoma; 32 counties in Texas. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
Apr 9, 2008, 8:13 PM CDT (01:13 UTC)
Expired
Apr 9, 2008, 9:15 PM CDT
In force
62 min
Issued by
the Storm Prediction Center
All 47 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Garvin County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Anderson County, TX, Bosque County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Falls County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Grayson County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Leon County, TX, Limestone County, TX, McLennan County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Smith County, TX, Tarrant County, TX, Van Zandt County, TX, Wise County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 114 km from the middle of the area, began a volume at 01:14 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 00:00Z, 1.2 hours before the alert went out and 101 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 2008-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2061 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 2008-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 237 square meters per square second.1939587897117Sfc1 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
2061 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
537 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
237 m²/s²
0-3 km storm-relative helicity
337 m²/s²
Significant tornado parameter
4.9
Supercell composite
22.7

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
Apr 9, 7:28 PM CDTMesoscale DiscussionSPCMcCurtain62 min
Apr 9, 8:10 PM CDTTornado WatchSPCMcCurtain6 hr
Apr 9, 10:01 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Coal, Garvin and 14 more59 min
Apr 9, 10:40 PM CDTTornado WatchSPCAtoka, Bryan, Carter, Choctaw, Coal, Cotton and 20 more7 hr
Apr 9, 11:22 PM CDTMesoscale DiscussionSPCBeckham, Blaine, Caddo, Canadian, Cleveland, Comanche and 16 more53 min
Apr 10, 1:36 AM CDTMesoscale DiscussionSPCBryan, Carter, Jefferson, Johnston, Love, Marshall and 1 more54 min
Apr 10, 3:30 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Choctaw, Coal, Haskell, Latimer and 8 more60 min
Apr 10, 3:54 AM CDTTornado WatchSPCAdair, Cherokee, Choctaw, Delaware, Haskell, Latimer and 9 more8 hr
Apr 10, 5:55 AM CDTMesoscale DiscussionSPCLeFlore, McCurtain65 min
Apr 10, 3:30 PM CDTMesoscale DiscussionSPCAlfalfa, Ellis, Grant, Harper, Kay, Woods and 1 more75 min
Apr 9, 7:44 PM CDTTornado WatchSPCBorden, Brown, Callahan, Coke, Coleman, Concho and 34 more8 hr
Apr 9, 11:46 PM CDTMesoscale DiscussionSPCAndrews, Borden, Brown, Callahan, Coke, Coleman and 35 more59 min
Apr 10, 8:32 AM CDTMesoscale DiscussionSPCAnderson, Bowie, Cass, Cherokee, Gregg, Harrison and 12 more58 min
Apr 10, 10:51 AM CDTMesoscale DiscussionSPCShelby84 min

Nearby

Mesoscale Discussions in Texas, 2008Mesoscale Discussions in Oklahoma, 2008Every mesoscale discussion in 2008

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.