Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 562
The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2012, 2:23 PM CDT for 5 counties in Texas. It was in force for 67 min.
The area
The outline as issued.
The facts
- Issued
- Apr 16, 2012, 2:23 PM CDT (19:23 UTC)
- Expired
- Apr 16, 2012, 3:30 PM CDT
- In force
- 67 min
- Issued by
- the Storm Prediction Center
Counties Brooks County, TX, Cameron County, TX, Hidalgo County, TX, Kenedy County, TX, Willacy County, TX
The radar
The Brownsville radar (KBRO), 70 km from the middle of the area, began a volume at 19:26 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
Brownsville Intl, TX (KBRO), launched 12:00Z, 7.4 hours before the alert went out and 73 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
- 2823 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 536 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 125 m²/s²
- 0-3 km storm-relative helicity
- 249 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
969
ACUS11 KWNS 161923
SWOMCD
SPC MCD 161923
TXZ000-162030-
MESOSCALE DISCUSSION 0562
NWS STORM PREDICTION CENTER NORMAN OK
0223 PM CDT MON APR 16 2012
AREAS AFFECTED...DEEP SOUTH TX
CONCERNING...SEVERE THUNDERSTORM WATCH 181...
VALID 161923Z - 162030Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 181
CONTINUES.
SEVERE WEATHER THREAT ACROSS DEEP SOUTH TX /PRIMARILY ERN HALF OF
WFO BRO COUNTY WARNING AREA/ IS EXPECTED TO EXTEND BEYOND
20Z...RESULTING IN THE POTENTIAL FOR A LOCAL TEMPORAL EXTENSION OF
WW 181. IN ADDITION TO THE SEVERE WEATHER THREAT...HEAVY RAINFALL
RATES EXCEEDING 1.5-2.0 INCH PER HOUR ARE LIKELY TO PERSIST AS
STORMS TRAIN ENEWD ALONG A SLOW SWD MOVING BOUNDARY.
TRENDS IN REGIONAL RADAR IMAGERY AND SURFACE OBSERVATIONS INDICATED
A SLOW SWD MOVING CONVECTIVE OUTFLOW BOUNDARY...WHICH AT 1910Z
EXTENDED FROM THE TX COAST /55 S CRP/ WSWWD TO NRN STARR COUNTY /OR
40 NNW MFE/ WHERE IT INTERSECTED A N-S BOUNDARY. MODERATE
INSTABILITY...A MOIST AIR MASS /PW VALUES EXCEEDING 1.5 INCH/...AND
EFFECTIVE BULK SHEAR OF 30-40 KT SUPPORT ADDITIONAL TSTMS /MULTICELL
AND SUPERCELL STORM MODES/ THROUGH THE REST OF THE AFTERNOON AS THE
SURFACE BOUNDARY ADVANCES SWD. HAIL AND LOCALLY DAMAGING WINDS WILL
REMAIN THE PRIMARY SEVERE THREATS.
..PETERS.. 04/16/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CRP...BRO...
LAT...LON 26159865 27039840 27419734 27629682 26949693 25919670
25839739 25979771 26009823 26159865SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 16, 5:50 AM CDT | Mesoscale Discussion | SPC | Aransas, Calhoun, Nueces, Refugio, San Patricio | 55 min |
| Apr 16, 8:07 AM CDT | Severe Thunderstorm Watch | SPC | Aransas, Bee, Brooks, Calhoun, Cameron, Goliad and 10 more | 7 hr |
| Apr 16, 12:06 PM CDT | Mesoscale Discussion | SPC | Aransas, Bee, Brooks, Calhoun, Cameron, DeWitt and 14 more | 84 min |
| Apr 16, 3:28 PM CDT | Severe Thunderstorm Watch | SPC | Cameron, Hidalgo, Kenedy, Willacy | 4 hr |
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.