Alert archive / Texas / Mesoscale Discussions in 2009

Mesoscale Discussion 503

April 17, 20094 states

The Storm Prediction Center issued this mesoscale discussion at Apr 17, 2009, 2:24 PM MDT for 4 states. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Apr 17, 2009, 2:24 PM MDT (20:24 UTC)
Expired
Apr 17, 2009, 4:00 PM MDT
In force
96 min
Issued by
the Storm Prediction Center
All 35 counties

Prowers County, CO, Grant County, KS, Haskell County, KS, Meade County, KS, Morton County, KS, Seward County, KS, Stanton County, KS, Stevens County, KS, Beaver County, OK, Beckham County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Roger Mills County, OK, Texas County, OK, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Foard County, TX, Gray County, TX, Hansford County, TX, Hardeman County, TX, Haskell County, TX, Hemphill County, TX, Jones County, TX, King County, TX, Knox County, TX, Lipscomb County, TX, Ochiltree County, TX, Roberts County, TX, Shackelford County, TX, Stonewall County, TX, Taylor County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 113 km from the middle of the area, began a volume at 20:27 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

Dodge City, (KDDC), launched 12:00Z, 8.4 hours before the alert went out and 277 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, Dodge City, at 12:00Z on 2009-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Dodge City, at 12:00Z on 2009-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 318 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
592 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
318 m²/s²
0-3 km storm-relative helicity
317 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 17, 1:17 AM MDTMesoscale DiscussionSPCBoulder, Broomfield, Denver, Douglas, Gilpin, Jefferson and 1 more4 hr
Apr 17, 11:49 AM MDTMesoscale DiscussionSPCCheyenne, Crowley, Kiowa, Prowers86 min
Apr 17, 4:19 PM MDTMesoscale DiscussionSPCKiowa, Lincoln56 min
Apr 17, 4:00 PM MDTSevere Thunderstorm WatchSPCGrant, Hamilton, Morton, Seward, Stanton, Stevens5 hr
Apr 16, 8:20 PM MDTMesoscale DiscussionSPCBeaver, Cimarron, Texas55 min
Apr 16, 6:31 PM MDTMesoscale DiscussionSPCBrewster, Kinney, Pecos, Terrell, Val Verde89 min
Apr 16, 6:43 PM MDTMesoscale DiscussionSPCAnderson, Angelina, Cherokee, Dallas, Ellis, Freestone and 23 more62 min
Apr 16, 7:36 PM MDTMesoscale DiscussionSPCAndrews, Borden, Briscoe, Castro, Childress, Coke and 34 more84 min
Apr 16, 9:56 PM MDTMesoscale DiscussionSPCCoke, Concho, Crockett, Fisher, Irion, Jones and 11 more94 min
Apr 16, 10:35 PM MDTSevere Thunderstorm WatchSPCBandera, Brown, Callahan, Coleman, Comanche, Concho and 26 more6 hr
Apr 17, 1:32 AM MDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Comanche, Concho, Eastland and 20 more118 min
Apr 17, 4:16 AM MDTMesoscale DiscussionSPCBlanco, Burnet, Edwards, Gillespie, Kendall, Kerr and 8 more59 min
Apr 17, 6:28 AM MDTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 23 more92 min
Apr 17, 6:48 AM MDTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 35 more5 hr
Apr 17, 8:56 AM MDTMesoscale DiscussionSPCAnderson, Angelina, Atascosa, Austin, Bastrop, Bee and 63 more94 min
Apr 17, 9:24 AM MDTTornado WatchSPCAustin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more7 hr
Apr 17, 11:10 AM MDTMesoscale DiscussionSPCAnderson, Angelina, Austin, Brazos, Cherokee, Colorado and 19 more3 hr
Apr 17, 11:38 AM MDTMesoscale DiscussionSPCAtascosa, Bee, DeWitt, Goliad, Gonzales, Karnes and 7 more37 min
Apr 17, 11:51 AM MDTSevere Thunderstorm WatchSPCAtascosa, Bee, Calhoun, DeWitt, Fayette, Frio and 10 more5 hr
Apr 17, 12:45 PM MDTMesoscale DiscussionSPCBrazoria, Chambers, Colorado, Fort Bend, Galveston, Hardin and 11 more2 hr
Apr 17, 2:19 PM MDTMesoscale DiscussionSPCAransas, Atascosa, Bastrop, Bee, Bell, Bexar and 31 more56 min
Apr 17, 2:44 PM MDTTornado WatchSPCAransas, Austin, Bee, Brazoria, Calhoun, Chambers and 22 more6 hr
Apr 17, 5:50 PM MDTMesoscale DiscussionSPCAransas, Bee, Brazoria, Calhoun, Chambers, Colorado and 18 more85 min

Nearby

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