Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 753
The Storm Prediction Center issued this mesoscale discussion at May 7, 2012, 7:54 PM CDT for 46 counties in Texas. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- May 7, 2012, 7:54 PM CDT (00:54 UTC)
- Expired
- May 7, 2012, 9:00 PM CDT
- In force
- 66 min
- Issued by
- the Storm Prediction Center
All 46 counties
Atascosa County, TX, Bandera County, TX, Bastrop County, TX, Bee County, TX, Bexar County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Comal County, TX, DeWitt County, TX, Dimmit County, TX, Duval County, TX, Ellis County, TX, Falls County, TX, Fayette County, TX, Freestone County, TX, Frio County, TX, Goliad County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Henderson County, TX, Jim Wells County, TX, Karnes County, TX, Kaufman County, TX, Kinney County, TX, La Salle County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Live Oak County, TX, Maverick County, TX, McLennan County, TX, McMullen County, TX, Medina County, TX, Milam County, TX, Navarro County, TX, Rains County, TX, Robertson County, TX, Travis County, TX, Uvalde County, TX, Van Zandt County, TX, Webb County, TX, Williamson County, TX, Wilson County, TX, Zavala County, TX
The radar
The Austin/San Antonio radar (KEWX), 39 km from the middle of the area, began a volume at 00:54 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
Corpus Christi, TX (KCRP), launched 00:00Z, 0.9 hours before the alert went out and 267 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
- 1286 J/kg
- Mixed-layer CIN
- -248 J/kg
- Mixed-layer LCL
- 1023 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- -57 m²/s²
- 0-3 km storm-relative helicity
- -30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted, in the capitals the NWS used until 2016.
482
ACUS11 KWNS 080055
SWOMCD
SPC MCD 080054
TXZ000-080200-
MESOSCALE DISCUSSION 0753
NWS STORM PREDICTION CENTER NORMAN OK
0754 PM CDT MON MAY 07 2012
AREAS AFFECTED...NERN TO S TX
CONCERNING...SEVERE THUNDERSTORM WATCH 263...
VALID 080054Z - 080200Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 263
CONTINUES.
SUMMARY...REMNANT TSTM CLUSTERS INVOF TX HILL COUNTRY HAVE BECOME
INCREASINGLY DISORGANIZED...WITH PULSE STORMS ALONG THE COLD FRONT
IN NERN TX. RISKS FOR ISOLATED SEVERE HAIL AND LOCALLY DAMAGING
WINDS MAY PERSIST FOR THE NEXT COUPLE OF HOURS BUT WILL LIKELY
DIMINISH WITH TIME THIS EVENING.
DISCUSSION...MCS OVER THE TX HILL COUNTRY HAS APPEARED INCREASINGLY
DISORGANIZED IN THE PAST HOUR WITH OUTFLOW SURGING AHEAD OF STRONGER
CORES APPROACHING THE AUSTIN/SAN ANTONIO AREA. WITH THE ONSET OF
NOCTURNAL COOLING...MODIFIED 00Z CRP RAOB WOULD SUGGEST THAT
STRENGTHENING MLCIN MAY CURTAIL MCS REINTENSIFICATION WITHIN A
WEAKLY SHEARED ENVIRONMENT. STILL...WITH RENEWED UPDRAFTS WITH SRN
EXTENT ALONG THE RIO GRANDE WITHIN A HOT ENVIRONMENT /100 F AT 00Z
AT LRD/...A SMALL WW MAY BE POSSIBLE FOR PARTS OF S TX.
FARTHER NE...PULSE UPDRAFTS WITH MINIMAL DEEP-LAYER SHEAR /PER 00Z
FWD RAOB/ ALONG THE COLD FRONT INTO NERN TX SHOULD POSE A NEAR-TERM
RISK FOR SEVERE HAIL AND LOCALIZED MICROBURSTS.
..GRAMS.. 05/08/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...HGX...FWD...CRP...EWX...BRO...
LAT...LON 29320090 29730036 29779871 30649766 32489675 32969596
32859571 32239568 31709569 30979607 28999718 27399806
27039890 27139940 28360054 29320090SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 7:39 PM CDT | Severe Thunderstorm Watch | SPC | Camp, Gregg, Harrison, Marion, Morris, Panola and 5 more | 4 hr |
| May 7, 9:15 PM CDT | Mesoscale Discussion | SPC | Camp, Cass, Gregg, Harrison, Marion, Morris and 6 more | 60 min |
| May 7, 9:46 PM CDT | Mesoscale Discussion | SPC | Andrews, Borden, Crane, Crockett, Dawson, Ector and 15 more | 89 min |
| May 8, 1:42 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bexar, Comal, Dimmit, Edwards and 13 more | 93 min |
| May 8, 10:44 AM CDT | Mesoscale Discussion | SPC | Bee, Brooks, Duval, Frio, Goliad, Jim Hogg and 11 more | 61 min |
| May 8, 10:58 AM CDT | Severe Thunderstorm Watch | SPC | Aransas, Atascosa, Bee, Brooks, Calhoun, Cameron and 28 more | 8 hr |
| May 8, 1:37 PM CDT | Mesoscale Discussion | SPC | Brewster, Culberson, El Paso, Hudspeth, Jeff Davis, Presidio and 1 more | 113 min |
| May 8, 2:07 PM CDT | Severe Thunderstorm Watch | SPC | Brewster, Culberson, El Paso, Hudspeth, Jeff Davis, Presidio | 7 hr |
| May 8, 3:03 PM CDT | Mesoscale Discussion | SPC | Cameron, Hidalgo, Starr, Willacy | 87 min |
| May 8, 4:53 PM CDT | Mesoscale Discussion | SPC | Brewster, Culberson, El Paso, Hudspeth, Jeff Davis, Presidio | 67 min |
| May 8, 5:47 PM CDT | Mesoscale Discussion | SPC | Cameron, Hidalgo, Kenedy, Willacy | 58 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.