Alert archive / Texas / Mesoscale Discussions in 2009

Mesoscale Discussion 683

May 3, 200934 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 3, 2009, 3:02 AM CDT for 34 counties in Texas. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
May 3, 2009, 3:02 AM CDT (08:02 UTC)
Expired
May 3, 2009, 5:00 AM CDT
In force
118 min
Issued by
the Storm Prediction Center
All 34 counties

Anderson County, TX, Bell County, TX, Bosque County, TX, Brown County, TX, Burnet County, TX, Collin County, TX, Comanche County, TX, Coryell County, TX, Dallas County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Freestone County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, McLennan County, TX, Milam County, TX, Mills County, TX, Navarro County, TX, Robertson County, TX, Rockwall County, TX, San Saba County, TX, Somervell County, TX, Tarrant County, TX, Williamson County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 99 km from the middle of the area, began a volume at 08:06 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, 8.0 hours before the alert went out and 128 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 2009-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 402 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 2009-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 127 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
402 J/kg
Mixed-layer CIN
-141 J/kg
Mixed-layer LCL
497 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
127 m²/s²
0-3 km storm-relative helicity
194 m²/s²
Significant tornado parameter
0.0
Supercell composite
8.6

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.

IssuedProductOfficeCountiesLasted
May 2, 7:38 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Dallas, Ellis, Franklin and 15 more97 min
May 2, 8:04 PM CDTMesoscale DiscussionSPCBorden, Callahan, Coleman, Comanche, Dawson, Eastland and 21 more86 min
May 2, 9:59 PM CDTMesoscale DiscussionSPCBowie, Cass, Delta, Fannin, Franklin, Hopkins and 5 more3 hr
May 2, 10:40 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Dallas, Delta, Franklin and 15 more2 hr
May 2, 11:43 PM CDTSevere Thunderstorm WatchSPCBowie, Camp, Cass, Franklin, Gregg, Harrison and 6 more5 hr
May 3, 2:39 AM CDTMesoscale DiscussionSPCCamp, Cherokee, Gregg, Harrison, Henderson, Kaufman and 10 more2 hr
May 3, 5:12 AM CDTSevere Thunderstorm WatchSPCAnderson, Angelina, Brazos, Burleson, Cherokee, Freestone and 28 more7 hr
May 3, 6:54 AM CDTMesoscale DiscussionSPCAngelina, Grimes, Hardin, Harrison, Jasper, Liberty and 14 more2 hr
May 3, 9:24 AM CDTMesoscale DiscussionSPCChambers, Hardin, Jasper, Jefferson, Newton, Orange and 3 more66 min

Nearby

Mesoscale 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.