Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 481
The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2011, 9:03 PM CDT for 9 counties in Texas. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- Apr 19, 2011, 9:03 PM CDT (02:03 UTC)
- Expired
- Apr 19, 2011, 10:00 PM CDT
- In force
- 57 min
- Issued by
- the Storm Prediction Center
Counties Bell County, TX, Coryell County, TX, Falls County, TX, Freestone County, TX, Henderson County, TX, Hill County, TX, Limestone County, TX, McLennan County, TX, Navarro County, TX
The radar
The Ft Hood radar (KGRK), 107 km from the middle of the area, began a volume at 02:04 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, 2.1 hours before the alert went out and 135 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
- 3240 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- -127 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted, in the capitals the NWS used until 2016.
777
ACUS11 KWNS 200203
SWOMCD
SPC MCD 200203
TXZ000-200300-
MESOSCALE DISCUSSION 0481
NWS STORM PREDICTION CENTER NORMAN OK
0903 PM CDT TUE APR 19 2011
AREAS AFFECTED...SRN PORTIONS OF N-CNTRL TX
CONCERNING...SEVERE THUNDERSTORM WATCH 156...
VALID 200203Z - 200300Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 156
CONTINUES.
THREAT FOR ISOLATED LARGE HAIL MAY PERSIST FOR ANOTHER 30 MINUTES TO
AN HOUR WITH LONE SUPERCELL JUST SOUTH OF ITASCA. ONCE THIS STORM
DIMINISHES ADDITIONAL DEVELOPMENT APPEARS UNLIKELY.
LONE SUPERCELL STORM THAT DEVELOPED EARLIER ALONG THE DRYLINE-COLD
FRONT MERGER APPEARS TO BE WEAKENING. INCREASING CONVECTIVE
INHIBITION RESULTING FROM A STABILIZING BOUNDARY LAYER AND WEAKENING
CONVERGENCE ALONG STALLED BOUNDARY SUGGEST ADDITIONAL DEVELOPMENT IS
UNLIKELY ONCE THIS STORM DISSIPATES. PRIOR TO DISSIPATION...THE
STORM WILL REMAIN CAPABLE OF PRODUCING ISOLATED LARGE HAIL AND
PERHAPS DOWNBURST WINDS.
..DIAL.. 04/20/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FWD...EWX...
LAT...LON 31369810 31839771 32079715 32289603 32239560 31739585
30879678 30989793 31369810SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 7:47 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Delta, Franklin, Hopkins and 11 more | 88 min |
| Apr 19, 11:17 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Franklin, Gregg, Harrison and 7 more | 58 min |
| Apr 19, 11:45 PM CDT | Severe Thunderstorm Watch | SPC | Bowie, Camp, Cass, Franklin, Gregg, Harrison and 6 more | 3 hr |
| Apr 20, 12:46 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Franklin, Marion, Morris and 2 more | 89 min |
| Apr 20, 1:52 PM CDT | Mesoscale Discussion | SPC | Bell, Bosque, Brown, Burnet, Coleman, Comanche and 21 more | 53 min |
| Apr 20, 2:04 PM CDT | Severe Thunderstorm Watch | SPC | Bowie, Red River | 7 hr |
| Apr 20, 2:21 PM CDT | Severe Thunderstorm Watch | SPC | Bandera, Bell, Blanco, Burnet, Concho, Coryell and 20 more | 8 hr |
| Apr 20, 5:47 PM CDT | Mesoscale Discussion | SPC | Blanco, Burnet, Concho, Crockett, Edwards, Gillespie and 15 more | 58 min |
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.