Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 821
The Storm Prediction Center issued this mesoscale discussion at May 19, 2011, 9:36 PM CDT for 34 counties in Texas. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- May 19, 2011, 9:36 PM CDT (02:36 UTC)
- Expired
- May 19, 2011, 11:00 PM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
All 34 counties
Borden County, TX, Briscoe County, TX, Childress County, TX, Coke County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dawson County, TX, Dickens County, TX, Donley County, TX, Fisher County, TX, Floyd County, TX, Garza County, TX, Glasscock County, TX, Gray County, TX, Hall County, TX, Hemphill County, TX, Howard County, TX, Irion County, TX, Kent County, TX, King County, TX, Lipscomb County, TX, Martin County, TX, Midland County, TX, Mitchell County, TX, Motley County, TX, Nolan County, TX, Reagan County, TX, Roberts County, TX, Scurry County, TX, Sterling County, TX, Stonewall County, TX, Tom Green County, TX, Wheeler County, TX
The radar
The Lubbock radar (KLBB), 119 km from the middle of the area, began a volume at 02:37 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
Amarillo Airport, TX (KAMA), launched 00:00Z, 2.6 hours before the alert went out and 173 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 4539 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
386
ACUS11 KWNS 200236
SWOMCD
SPC MCD 200236 COR
OKZ000-TXZ000-200400-
MESOSCALE DISCUSSION 0821
NWS STORM PREDICTION CENTER NORMAN OK
0936 PM CDT THU MAY 19 2011
AREAS AFFECTED...ERN TX PANHANDLE...WRN TX
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 200236Z - 200400Z
CORRECTED FOR WRN TX IN THE HEADER
PORTIONS OF THE ERN TX PANHANDLE AND W TX ARE BEING MONITORED FOR
THUNDERSTORM INITIATION/INCREASING COVERAGE. LARGE HAIL/DAMAGING
WIND GUSTS WILL BE POSSIBLE WITH ANY STORMS TONIGHT. A WW ISSUANCE
MAY BECOME NECESSARY DURING THE NEXT FEW HRS.
WV IMAGERY SHOWS AN UPPER DISTURBANCE MOVING EWD ACROSS SRN
AZ...WITH SIGNS OF INCREASING LARGE SCALE ASCENT BEGINNING TO SPREAD
ACROSS THE SRN HIGH PLAINS. MEANWHILE AT THE SURFACE...DRYLINE HAS
RETREATED WWD INTO PORTIONS OF WRN TX/FAR ERN TX PANHANDLE. ISOLATED
THUNDERSTORMS HAVE BEEN ONGOING ALONG THE DRYLINE SE OF CDS...WHILE
A NEW STORM HAS RECENTLY DEVELOPED WITHIN THE DRIER BOUNDARY LAYER
AIRMASS /WHERE DEWPOINTS ARE IN THE 30S AND 40S/ IMMEDIATELY S OF
LBB /LYNN COUNTY/. THIS NEW DEVELOPMENT LENDS SUPPORT TO SHORT TERM
MODEL GUIDANCE...WHICH SHOWS THUNDERSTORM DEVELOPMENT OCCURRING
ALONG THE MOISTURE/INSTABILITY GRADIENT OVER WRN TX/ERN TX PANHANDLE
BY 05Z. RUC FORECAST SOUNDINGS INDICATE THE PRESENCE OF STEEP
MIDLEVEL LAPSE RATES /7-8 C PER KM IN THE 700-500 MB LAYER/ AND
SURFACE DEWPOINTS IN THE 60S WILL SUPPORT MUCAPE VALUES IN EXCESS OF
1500 J/KG...WITH SHEAR PROFILES FAVORABLE FOR SVR STORMS/POSSIBLE
SUPERCELLS POSING A LARGE HAIL/DAMAGING WIND THREAT. IN
ADDITION...LOW-LEVEL HODOGRAPH STRUCTURE WILL SUPPORT A MARGINAL
TORNADO THREAT DURING THE INITIAL STAGES OF STORM DEVELOPMENT.
..GARNER.. 05/20/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OUN...SJT...LUB...AMA...MAF...
LAT...LON 35039984 32519991 31220037 31090189 32140218 35810087
36480046 36419992 35039984SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 7:47 PM CDT | Mesoscale Discussion | SPC | Baylor, Haskell, Knox, Wichita, Wilbarger | 118 min |
| May 19, 11:39 PM CDT | Severe Thunderstorm Watch | SPC | Baylor, Borden, Childress, Coke, Cottle, Dickens and 19 more | 6 hr |
| May 20, 2:58 AM CDT | Mesoscale Discussion | SPC | Baylor, Coke, Fisher, Foard, Glasscock, Haskell and 11 more | 92 min |
| May 20, 10:30 AM CDT | Mesoscale Discussion | SPC | Anderson, Bowie, Camp, Cass, Cherokee, Collin and 31 more | 60 min |
| May 20, 11:03 AM CDT | Tornado Watch | SPC | Bowie, Camp, Cass, Cherokee, Franklin, Gregg and 10 more | 7 hr |
| May 20, 12:08 PM CDT | Mesoscale Discussion | SPC | Anderson, Bandera, Bastrop, Bell, Blanco, Bosque and 56 more | 67 min |
| May 20, 12:28 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bandera, Bastrop, Bell, Bexar, Blanco and 60 more | 10 hr |
| May 20, 1:28 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Franklin, Gregg, Harrison and 8 more | 62 min |
| May 20, 4:00 PM CDT | Mesoscale Discussion | SPC | Anderson, Bowie, Camp, Cass, Delta, Franklin and 18 more | 60 min |
| May 20, 5:34 PM CDT | Mesoscale Discussion | SPC | Anderson, Bandera, Bastrop, Bell, Bexar, Blanco and 41 more | 116 min |
| May 20, 5:56 PM CDT | Tornado Watch | SPC | Bowie, Camp, Cass, Cherokee, Franklin, Gregg and 10 more | 3 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.