Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 565
The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2011, 3:29 AM CDT for 30 counties in Texas. It was in force for 61 min.
The area
The outline as issued.
The facts
- Issued
- Apr 25, 2011, 3:29 AM CDT (08:29 UTC)
- Expired
- Apr 25, 2011, 4:30 AM CDT
- In force
- 61 min
- Issued by
- the Storm Prediction Center
All 30 counties
Bosque County, TX, Camp County, TX, Collin County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Franklin County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Navarro County, TX, Parker County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Smith County, TX, Somervell County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 49 km from the middle of the area, began a volume at 08:29 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
Fort Worth, TX (KFWD), launched 00:00Z, 8.5 hours before the alert went out and 43 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
- 1679 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 1811 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 6.0
The text
As transmitted, in the capitals the NWS used until 2016.
444
ACUS11 KWNS 250829
SWOMCD
SPC MCD 250829
TXZ000-OKZ000-250930-
MESOSCALE DISCUSSION 0565
NWS STORM PREDICTION CENTER NORMAN OK
0329 AM CDT MON APR 25 2011
AREAS AFFECTED...N-CNTRL THROUGH NERN TX
CONCERNING...SEVERE THUNDERSTORM WATCH 198...
VALID 250829Z - 250930Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 198
CONTINUES.
THREAT FOR ISOLATED LARGE HAIL AND POSSIBLY ISOLATED STRONG WIND
GUSTS CONTINUE ACROSS N-CNTRL TX. THREAT COULD EVENTUALLY SPREAD
INTO NERN TX.
QUASI-STATIONARY FRONT EXTENDS FROM CNTRL AR WSWWD ALONG RED RIVER
AREA INTO WRN TX. WHAT IS LEFT OF STORMS THAT DEVELOPED SUNDAY
EVENING CONTINUE OVER N-CNTRL TX. HOWEVER...TREND HAS BEEN FOR MOST
STORMS TO GRADUALLY WEAKEN. ACTIVITY IS MOVING THROUGH WARM SECTOR
TO THE SOUTH OF BAROCLINIC ZONE LOCATED ALONG THE RED RIVER. IT IS
NOT CLEAR WHETHER THE STRONG STORM RELATIVE INFLOW AND CONVERGENCE
ASSOCIATED WITH THE STRONG LLJ INTERACTING WITH THE CONVECTIVE
OUTFLOW BOUNDARIES WILL BE SUFFICIENT TO MAINTAIN STORMS INTO NERN
TX GIVEN CINH ASSOCIATED WITH EML ABOVE THE STABLE BOUNDARY LAYER.
NEVERTHELESS BEHAVIOR OF STORMS NEAR THE RED RIVER AREA SUGGEST AT
LEAST SOME POTENTIAL EXISTS FOR ACTIVITY TO TRANSITION INTO A
FORWARD PROPAGATING MCS. IF THIS OCCURS THE THREAT FOR ISOLATED
DAMAGING WIND WOULD INCREASE.
..DIAL.. 04/25/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...SHV...TSA...FWD...OUN...
LAT...LON 31779850 32239840 33049766 33359701 33759633 33899548
33689484 32339486 31899674 31779850SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 7:35 PM CDT | Mesoscale Discussion | SPC | Carson, Gray, Hansford, Hemphill, Hutchinson, Lipscomb and 5 more | 2 hr |
| Apr 24, 8:48 PM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Callahan, Coleman, Collin, Comanche and 36 more | 117 min |
| Apr 24, 11:25 PM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Callahan, Camp, Coke, Coleman and 39 more | 65 min |
| Apr 24, 11:43 PM CDT | Severe Thunderstorm Watch | SPC | Bosque, Bowie, Camp, Cass, Collin, Comanche and 40 more | 5 hr |
| Apr 24, 11:58 PM CDT | Mesoscale Discussion | SPC | Hemphill, Lipscomb, Ochiltree | 92 min |
| Apr 25, 4:41 AM CDT | Severe Thunderstorm Watch | SPC | Bowie, Camp, Cass, Collin, Dallas, Delta and 21 more | 7 hr |
| Apr 25, 7:23 AM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Gregg, Harrison, Marion and 3 more | 97 min |
| Apr 25, 10:46 AM CDT | Mesoscale Discussion | SPC | Anderson, Bosque, Bowie, Brazos, Camp, Cass and 42 more | 59 min |
| Apr 25, 11:00 AM CDT | Tornado Watch | SPC | Bosque, Bowie, Camp, Cass, Collin, Cooke and 34 more | 7 hr |
| Apr 25, 1:28 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Collin, Cooke, Dallas and 30 more | 92 min |
| Apr 25, 2:16 PM CDT | Mesoscale Discussion | SPC | Angelina, Bastrop, Bell, Blanco, Brazos, Burleson and 27 more | 59 min |
| Apr 25, 2:41 PM CDT | Tornado Watch | SPC | Anderson, Angelina, Bastrop, Bell, Blanco, Bosque and 49 more | 9 hr |
| Apr 25, 3:22 PM CDT | Tornado Watch | SPC | Bowie, Camp, Cass, Franklin, Gregg, Harrison and 7 more | 8 hr |
| Apr 25, 5:21 PM CDT | Mesoscale Discussion | SPC | Bosque, Delta, Ellis, Henderson, Hill, Hopkins and 7 more | 54 min |
| Apr 25, 5:24 PM CDT | Mesoscale Discussion | SPC | Armstrong, Carson, Childress, Collingsworth, Donley, Gray and 3 more | 66 min |
| Apr 25, 6:57 PM CDT | Mesoscale Discussion | SPC | Anderson, Angelina, Bell, Blanco, Brazos, Burleson and 22 more | 2 hr |
Nearby
Mesoscale Discussions in Texas, 2011Every mesoscale discussion in 2011
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.