Alert archive / Texas / Mesoscale Discussions in 2007
Mesoscale Discussion 621
The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2007, 8:35 PM CDT for 30 counties in Texas. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Apr 29, 2007, 8:35 PM CDT (01:35 UTC)
- Expired
- Apr 29, 2007, 10:30 PM CDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
All 30 counties
Baylor County, TX, Callahan County, TX, Coke County, TX, Coleman County, TX, Concho County, TX, Ector County, TX, Fisher County, TX, Foard County, TX, Glasscock County, TX, Hardeman County, TX, Haskell County, TX, Howard County, TX, Irion County, TX, Jones County, TX, Kent County, TX, King County, TX, Knox County, TX, Menard County, TX, Midland County, TX, Mitchell County, TX, Nolan County, TX, Runnels County, TX, Scurry County, TX, Shackelford County, TX, Sterling County, TX, Stonewall County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Wilbarger County, TX
The radar
The Dyess AFB radar (KDYX), 95 km from the middle of the area, began a volume at 01:36 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 nearest sounding before it
Midland Regional, TX (KMAF), launched 00:00Z, 1.6 hours before the alert went out and 190 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.
- Mixed-layer CAPE
- 218 J/kg
- Mixed-layer CIN
- -145 J/kg
- Mixed-layer LCL
- 895 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 257 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 300135 SWOMCD SPC MCD 300135 TXZ000-OKZ000-300330- MESOSCALE DISCUSSION 0621 NWS STORM PREDICTION CENTER NORMAN OK 0835 PM CDT SUN APR 29 2007 AREAS AFFECTED...NWRN TX CONCERNING...SEVERE THUNDERSTORM WATCH 199... VALID 300135Z - 300330Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 199 CONTINUES. WIDESPREAD DEEP CONVECTION CONTINUES ALONG AND NORTH OF WELL-DEFINED CONVECTIVE OUTFLOW BOUNDARY FROM NEAR ABI SWWD TO SJT AND THEN WWD TO FST. MESOSCALE LIFT ACROSS THE BOUNDARY COUPLED WITH LARGE SCALE ASCENT WITHIN DIFFLUENT FLOW AHEAD OF UPPER LOW WILL MAINTAIN ORGANIZED MULTICELLULAR ACTIVITY. ONE WELL ESTABLISHED BOWING LINE SEGMENT...CURRENTLY ENTERING WRN REAGAN COUNTY IN TORNADO WATCH 200...SHOULD CONTINUE TO MOVE EAST INTO SRN PARTS OF SEVERE TSTM WATCH 199 IN THE NEXT HOUR. THIS ACTIVITY APPEARS FAVORABLY ORIENTED TO THE OUTFLOW BOUNDARY TO MAINTAIN STRONG LOW LEVEL INFLOW AND SHEAR. UNSTABLE AIR MASS SOUTH AND EAST OF THIS CONVECTION REMAINS UNPERTURBED SO SEVERE POTENTIAL ACROSS SRN PARTS OF WATCH 199 SHOULD CONTINUE. DESPITE MODEST LARGE SCALE SUPPORT FOR UPWARD MOTION OVER NWRN TX...STORMS IN THIS REGION ARE MORE REMOVED FROM UNSTABLE INFLOW. EXPECT THAT NRN PARTS OF WATCH 199 WILL BEGIN TO BE CLEARED OVER THE NEXT HOUR. ..CARBIN.. 04/30/2007 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FWD...OUN...SJT...LUB...MAF... 30739946 30710011 31110013 31080124 31680128 31620274 32100278 32090163 32530165 32480111 32950119 32970107 33400106 33360049 33840052 33810001 34559998 34399968 34259923 34169896 32979894 32959910 32109909 32089922 31469918 31419940 31539957 30959961 30949947
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 29, 7:25 PM CDT | Mesoscale Discussion | SPC | Brewster, Crane, Crockett, Culberson, Jeff Davis, Loving and 11 more | 65 min |
| Apr 29, 7:48 PM CDT | Tornado Watch | SPC | Bandera, Brewster, Crane, Crockett, Dimmit, Edwards and 18 more | 7 hr |
| Apr 29, 10:42 PM CDT | Mesoscale Discussion | SPC | Bandera, Brewster, Crane, Crockett, Dimmit, Edwards and 18 more | 63 min |
| Apr 30, 2:10 AM CDT | Mesoscale Discussion | SPC | Bandera, Crockett, Dimmit, Edwards, Frio, Kerr and 12 more | 95 min |
| Apr 30, 2:47 AM CDT | Mesoscale Discussion | SPC | Bandera, Blanco, Burnet, Edwards, Gillespie, Kendall and 10 more | 3 hr |
| Apr 30, 2:51 AM CDT | Severe Thunderstorm Watch | SPC | Bandera, Blanco, Burnet, Edwards, Gillespie, Kendall and 9 more | 5 hr |
| Apr 30, 4:46 AM CDT | Mesoscale Discussion | SPC | Bandera, Blanco, Burnet, Edwards, Gillespie, Kendall and 9 more | 119 min |
| Apr 30, 12:37 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bastrop, Bee, Caldwell, DeWitt, Dimmit and 15 more | 83 min |
| Apr 30, 1:22 PM CDT | Mesoscale Discussion | SPC | Camp, Collin, Dallas, Delta, Fannin, Franklin and 14 more | 113 min |
| Apr 30, 1:26 PM CDT | Severe Thunderstorm Watch | SPC | Austin, Brazoria, Colorado, DeWitt, Fayette, Fort Bend and 10 more | 7 hr |
| Apr 30, 3:01 PM CDT | Tornado Watch | SPC | Dimmit, Duval, Frio, Jim Wells, La Salle, Live Oak and 4 more | 7 hr |
| Apr 30, 3:23 PM CDT | Mesoscale Discussion | SPC | Grimes, Harris, Houston, Leon, Liberty, Madison and 4 more | 97 min |
| Apr 30, 5:38 PM CDT | Mesoscale Discussion | SPC | Archer, Armstrong, Baylor, Borden, Briscoe, Callahan and 42 more | 2 hr |
| Apr 30, 6:18 PM CDT | Mesoscale Discussion | SPC | Dimmit, Duval, Frio, Jim Wells, La Salle, Live Oak and 4 more | 57 min |
| Apr 30, 6:37 PM CDT | Mesoscale Discussion | SPC | Austin, Brazoria, Colorado, DeWitt, Fayette, Fort Bend and 10 more | 83 min |
Nearby
Mesoscale Discussions in Texas, 2007Every mesoscale discussion in 2007
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.