Alert archive / Texas / Mesoscale Discussions in 2008
Mesoscale Discussion 749
The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2008, 7:45 AM CDT for 65 counties in Texas. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 2008, 7:45 AM CDT (12:45 UTC)
- Expired
- Apr 27, 2008, 8:45 AM CDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
All 65 counties
Atascosa County, TX, Austin County, TX, Bandera County, TX, Bastrop County, TX, Bell County, TX, Bexar County, TX, Blanco County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Caldwell County, TX, Colorado County, TX, Comal County, TX, Concho County, TX, Coryell County, TX, Crockett County, TX, DeWitt County, TX, Dimmit County, TX, Edwards County, TX, Falls County, TX, Fayette County, TX, Fort Bend County, TX, Frio County, TX, Gillespie County, TX, Goliad County, TX, Gonzales County, TX, Grimes County, TX, Guadalupe County, TX, Hays County, TX, Irion County, TX, Jackson County, TX, Karnes County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, Lampasas County, TX, Lavaca County, TX, Lee County, TX, Llano County, TX, Mason County, TX, Matagorda County, TX, Maverick County, TX, McCulloch County, TX, Medina County, TX, Menard County, TX, Milam County, TX, Mills County, TX, Reagan County, TX, Real County, TX, Robertson County, TX, San Saba County, TX, Schleicher County, TX, Sutton County, TX, Tom Green County, TX, Travis County, TX, Uvalde County, TX, Val Verde County, TX, Victoria County, TX, Waller County, TX, Washington County, TX, Wharton County, TX, Williamson County, TX, Wilson County, TX, Zavala County, TX
The radar
The Austin/San Antonio radar (KEWX), 101 km from the middle of the area, began a volume at 12:47 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
Del Rio, TX (KDRT), launched 12:00Z, 0.8 hours before the alert went out and 191 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
- 2 J/kg
- Mixed-layer CIN
- -554 J/kg
- Mixed-layer LCL
- 1766 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 215 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 271246 SWOMCD SPC MCD 271245 TXZ000-271345- MESOSCALE DISCUSSION 0749 NWS STORM PREDICTION CENTER NORMAN OK 0745 AM CDT SUN APR 27 2008 AREAS AFFECTED...MUCH OF CENTRAL AND SRN TX CONCERNING...SEVERE THUNDERSTORM WATCH 241... VALID 271245Z - 271345Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 241 CONTINUES. ISOLATED SEVERE STORMS REMAIN POSSIBLE IN THE SHORT TERM /NEXT 1-3 HOURS/ ACROSS MAINLY ERN PARTS OF WW 241. 12Z SURFACE ANALYSIS SHOWED THE COLD FRONT CONTINUED TO PROGRESS SSEWD AND EXTENDED FROM THE LOWER OH VALLEY SWWD THROUGH THE ARKLATEX TO CENTRAL AND SW TX. A WEAKER BOUNDARY S OF THE FRONT EXTENDED FROM SE OF DRT EWD TO NEAR HOU TO OFFSHORE OF LA...WHILE AN OLD FRONT EXTENDED NEWD THROUGH E TX...CENTRAL LA TO NRN AL. A MOIST/MODERATELY UNSTABLE AIR MASS RESIDES S OF THE COLD FRONT. EFFECTIVE BULK SHEAR VALUES AROUND 30 KT SHOULD SUPPORT AN ISOLATED SEVERE TSTM ACROSS MAINLY THE ERN HALF OF WW 241 THROUGH 14-15Z AS ADDITIONAL TSTMS DEVELOP CLOSER TO AND TRACK EWD THROUGH THE STRONGER INSTABILITY. HOWEVER...OVERALL WARMING CLOUD TOP TEMPERATURES AND DIMINISHING TREND IN STORM INTENSITIES WOULD SUGGEST THAT THE SEVERE THREAT FOR THE NEXT SEVERAL HOURS WILL CONTINUE TO DECREASE. MEANWHILE...REGIONAL RADARS/LIGHTNING DATA INDICATED RECENT ELEVATED TSTM DEVELOPMENT ACROSS WEST CENTRAL TX WHERE WSR-88D VWPS AND WIND PROFILERS SHOWED THE POST-FRONTAL COLD BOUNDARY LAYER WAS ABOUT 2 KM DEEP. HEIGHT FALLS WITH SHORT WAVE TROUGH TRACKING SEWD THROUGH THE SRN HIGH PLAINS SHOULD SUPPORT ADDITIONAL TSTM DEVELOPMENT THIS MORNING...BUT WEAK INSTABILITY IS EXPECTED TO LIMIT THE SEVERE WEATHER THREAT. ..PETERS.. 04/27/2008 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...HGX...FWD...CRP...EWX...SJT...MAF... 28769557 28769558 28429682 28519819 28439943 28370016 29110092 29570120 29840161 30480174 31090236 31250169 31690119 31790016 31559871 31489801 31349636 31109596
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 9:33 PM CDT | Mesoscale Discussion | SPC | Coke, Concho, Crockett, Glasscock, Irion, Menard and 6 more | 87 min |
| Apr 26, 11:34 PM CDT | Severe Thunderstorm Watch | SPC | Bandera, Bastrop, Bell, Blanco, Brown, Burnet and 33 more | 5 hr |
| Apr 27, 1:46 AM CDT | Mesoscale Discussion | SPC | Anderson, Bandera, Bastrop, Bell, Blanco, Bosque and 75 more | 29 min |
| Apr 27, 3:39 AM CDT | Mesoscale Discussion | SPC | Anderson, Bandera, Bastrop, Bell, Bexar, Blanco and 45 more | 36 min |
| Apr 27, 4:34 AM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Austin, Bandera, Bastrop, Bell, Bexar and 54 more | 7 hr |
Nearby
Mesoscale Discussions in Texas, 2008Every mesoscale discussion in 2008
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.