Alert archive / Texas / Mesoscale Discussions in 2008

Mesoscale Discussion 2415

December 8, 20084 counties in Oklahoma; 20 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Dec 8, 2008, 7:10 PM CST for 4 counties in Oklahoma; 20 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Dec 8, 2008, 7:10 PM CST (01:10 UTC)
Expired
Dec 8, 2008, 9:15 PM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 24 counties

Bryan County, OK, Carter County, OK, Love County, OK, Marshall County, OK, Bosque County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Grayson County, TX, Hill County, TX, Hood County, TX, Jack County, TX, Johnson County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Rockwall County, TX, Somervell County, TX, Tarrant County, TX, Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 60 km from the middle of the area, began a volume at 01:09 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 32 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 2008-12-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 259 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 2008-12-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 307 square meters per square second.1939587897Sfc1 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
259 J/kg
Mixed-layer CIN
-225 J/kg
Mixed-layer LCL
1028 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
307 m²/s²
0-3 km storm-relative helicity
336 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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
Dec 8, 11:31 PM CSTTornado WatchSPCChoctaw, McCurtain, Pushmataha7 hr
Dec 9, 12:10 AM CSTMesoscale DiscussionSPCAdair, Cherokee, Delaware, Mayes, Ottawa35 min
Dec 9, 12:22 AM CSTSevere Thunderstorm WatchSPCAdair, Cherokee, Delaware, Haskell, Latimer, LeFlore and 2 more4 hr
Dec 9, 1:20 AM CSTMesoscale DiscussionSPCAdair, Cherokee, Delaware, Haskell, Latimer, LeFlore and 1 more25 min
Dec 9, 2:17 AM CSTMesoscale DiscussionSPCChoctaw, McCurtain, Pushmataha58 min
Dec 9, 3:41 AM CSTMesoscale DiscussionSPCMcCurtain64 min
Dec 9, 4:11 AM CSTTornado WatchSPCMcCurtain7 hr
Dec 8, 9:37 PM CSTSevere Thunderstorm WatchSPCAnderson, Bosque, Camp, Cherokee, Collin, Cooke and 36 more5 hr
Dec 8, 11:14 PM CSTMesoscale DiscussionSPCAnderson, Camp, Delta, Franklin, Freestone, Henderson and 16 more91 min
Dec 9, 2:30 AM CSTMesoscale DiscussionSPCBosque, Collin, Dallas, Grayson30 min
Dec 9, 7:41 AM CSTMesoscale DiscussionSPCAngelina, Cass, Cherokee, Gregg, Harrison, Marion and 8 more64 min
Dec 9, 10:12 AM CSTMesoscale DiscussionSPCAngelina, Jasper, Nacogdoches, Newton, Panola, Sabine and 2 more93 min
Dec 9, 2:18 PM CSTMesoscale DiscussionSPCHardin, Jasper, Newton, Orange87 min
Dec 9, 3:51 PM CSTTornado WatchSPCJasper, Jefferson, Newton, Orange9 hr

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.