Alert archive / Texas / Mesoscale Discussions in 2009
Mesoscale Discussion 770
The Storm Prediction Center issued this mesoscale discussion at May 8, 2009, 9:03 PM CDT for 32 counties in Texas. It was in force for 117 min.
The area
The outline as issued.
The facts
- Issued
- May 8, 2009, 9:03 PM CDT (02:03 UTC)
- Expired
- May 8, 2009, 11:00 PM CDT
- In force
- 117 min
- Issued by
- the Storm Prediction Center
All 32 counties
Bosque County, TX, Brown County, TX, Callahan County, TX, Clay County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Hamilton County, TX, Hood County, TX, Jack County, TX, Johnson County, TX, Lampasas County, TX, McCulloch County, TX, Mills County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Runnels County, TX, San Saba County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Taylor County, TX, Tom Green County, TX, Wise County, TX, Young County, TX
The radar
The Dyess AFB radar (KDYX), 73 km from the middle of the area, began a volume at 02:05 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, 2.1 hours before the alert went out and 126 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
- 4727 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 993 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 189 m²/s²
- Significant tornado parameter
- 3.5
- Supercell composite
- 16.7
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 8, 11:19 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Collin, Cooke, Dallas and 23 more | 86 min |
| May 8, 11:48 PM CDT | Tornado Watch | SPC | Camp, Collin, Cooke, Dallas, Delta, Denton and 28 more | 5 hr |
| May 9, 3:20 AM CDT | Mesoscale Discussion | SPC | Camp, Collin, Cooke, Dallas, Delta, Denton and 28 more | 55 min |
| May 9, 12:33 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Harrison, Marion, Morris and 2 more | 57 min |
| May 9, 12:51 PM CDT | Severe Thunderstorm Watch | SPC | Bowie, Camp, Cass, Franklin, Gregg, Harrison and 6 more | 7 hr |
| May 9, 3:25 PM CDT | Mesoscale Discussion | SPC | Bowie, Cass, Marion, Morris, Red River, Titus | 65 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.