Alert archive / Texas / Mesoscale Discussions in 2009

Mesoscale Discussion 589

April 26, 200931 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2009, 6:25 PM CDT for 31 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 26, 2009, 6:25 PM CDT (23:25 UTC)
Expired
Apr 26, 2009, 8:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 31 counties

Callahan County, TX, Coke County, TX, Coleman County, TX, Concho County, TX, Crockett County, TX, Edwards County, TX, Fisher County, TX, Glasscock County, TX, Haskell County, TX, Howard County, TX, Irion County, TX, Jones County, TX, Kimble County, TX, Kinney County, TX, Maverick County, TX, Menard County, TX, Mitchell County, TX, Nolan County, TX, Reagan County, TX, Runnels County, TX, Schleicher County, TX, Scurry County, TX, Shackelford County, TX, Sterling County, TX, Sutton County, TX, Taylor County, TX, Terrell County, TX, Throckmorton County, TX, Tom Green County, TX, Upton County, TX, Val Verde County, TX

The radar

The San Angelo radar (KSJT), 98 km from the middle of the area, began a volume at 23:29 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

Del Rio, TX (KDRT), launched 12:00Z, 11.4 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, Del Rio, TX at 12:00Z on 2009-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2045 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, Del Rio, TX at 12:00Z on 2009-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 210 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
2045 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
708 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
210 m²/s²
0-3 km storm-relative helicity
280 m²/s²
Significant tornado parameter
2.1
Supercell composite
9.5

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 26, 6:56 AM CDTMesoscale DiscussionSPCArmstrong, Borden, Briscoe, Carson, Childress, Collingsworth and 24 more94 min
Apr 26, 10:19 AM CDTMesoscale DiscussionSPCCarson, Gray, Hemphill, Lipscomb, Roberts, Wheeler56 min
Apr 26, 10:54 AM CDTMesoscale DiscussionSPCArcher, Baylor, Childress, Clay, Collingsworth, Cottle and 26 more66 min
Apr 26, 11:07 AM CDTTornado Watch PDSSPCCollingsworth, Donley, Gray, Hemphill, Lipscomb, Ochiltree and 2 more7 hr
Apr 26, 12:58 PM CDTMesoscale DiscussionSPCBaylor, Borden, Briscoe, Childress, Coke, Collingsworth and 29 more92 min
Apr 26, 1:37 PM CDTTornado Watch PDSSPCArcher, Baylor, Childress, Clay, Cottle, Crosby and 15 more5 hr
Apr 26, 3:01 PM CDTTornado WatchSPCCallahan, Coke, Crockett, Fisher, Glasscock, Haskell and 18 more5 hr
Apr 26, 3:34 PM CDTMesoscale DiscussionSPCChildress, Collingsworth, Cottle, Dickens, Donley, Foard and 9 more116 min
Apr 26, 5:44 PM CDTMesoscale DiscussionSPCArcher, Baylor, Childress, Clay, Collingsworth, Cottle and 11 more61 min
Apr 26, 6:16 PM CDTTornado Watch PDSSPCArcher, Baylor, Childress, Clay, Collingsworth, Cottle and 14 more8 hr

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.