Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 705
The Storm Prediction Center issued this mesoscale discussion at May 4, 2012, 9:53 PM CDT for 12 counties in Texas. It was in force for 67 min.
The area
The outline as issued.
The facts
- Issued
- May 4, 2012, 9:53 PM CDT (02:53 UTC)
- Expired
- May 4, 2012, 11:00 PM CDT
- In force
- 67 min
- Issued by
- the Storm Prediction Center
Counties Bosque County, TX, Collin County, TX, Dallas County, TX, Ellis County, TX, Grayson County, TX, Hamilton County, TX, Hill County, TX, Johnson County, TX, Mills County, TX, Rockwall County, TX, Somervell County, TX, Tarrant County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 7 km from the middle of the area, began a volume at 02:54 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
Fort Worth, TX (KFWD), launched 00:00Z, 2.9 hours before the alert went out and 23 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
- 2627 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 1899 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 117 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 7.1
The text
As transmitted, in the capitals the NWS used until 2016.
741
ACUS11 KWNS 050253
SWOMCD
SPC MCD 050253
TXZ000-050400-
MESOSCALE DISCUSSION 0705
NWS STORM PREDICTION CENTER NORMAN OK
0953 PM CDT FRI MAY 04 2012
AREAS AFFECTED...CNTRL TX
CONCERNING...SEVERE THUNDERSTORM WATCH 240...
VALID 050253Z - 050400Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 240
CONTINUES.
SUMMARY...THUNDERSTORMS CAPABLE OF DMGG WINDS AND LARGE HAIL ARE
GRADUALLY DIMINISHING IN COVERAGE. THE WW WILL BE ALLOWED TO EXPIRE
AT 04Z...THOUGH ISOLATED SEVERE MAY STILL OCCUR OVER THE NEXT FEW
HOURS. HOWEVER...COVERAGE IS EXPECTED TO BE INSUFFICIENT TO WARRANT
A NEW WW.
DISCUSSION...THE WRN PORTION OF THE WW CONTINUES TO STABILIZE IN THE
WAKE OF CONVECTIVE PRECIPITATION...AND AS DIURNAL COOLING BEGINS.
DOWNSTREAM OF THE ONGOING CONVECTION...MODERATE INSTABILITY IS
PERSISTING...WITH A NOW CLEARLY EVIDENT /PARTIALLY CONVECTIVELY
INDUCED/ VORT MAX SEEMING TO MAINTAIN A CLUSTER OF STORMS OVER N
CNTRL TX. WITH OUTFLOW UNDERCUTTING THE STORMS AND SURGING WELL OUT
AHEAD...AND THE ONSET OF DIURNAL COOLING...EXPECT A GRADUAL
WEAKENING TREND OVER THE NEXT FEW HOURS.
..HURLBUT.. 05/05/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FWD...SJT...
LAT...LON 33849696 33659635 33029612 32039660 31679738 31409818
31379876 31739898 32329773 33169710 33509698 33849696SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 7:28 PM CDT | Mesoscale Discussion | SPC | Archer, Bosque, Brown, Callahan, Clay, Coleman and 21 more | 62 min |
| May 5, 4:44 PM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Burnet, Callahan, Coleman, Comanche and 21 more | 61 min |
| May 5, 5:02 PM CDT | Severe Thunderstorm Watch | SPC | Blanco, Brown, Burnet, Coleman, Comanche, Concho and 11 more | 5 hr |
| May 5, 6:09 PM CDT | Mesoscale Discussion | SPC | Atascosa, La Salle, Live Oak, McMullen | 66 min |
Nearby
Mesoscale Discussions in Texas, 2012Every mesoscale discussion in 2012
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.