Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 383
The Storm Prediction Center issued this mesoscale discussion at Mar 29, 2012, 5:57 PM CDT for 8 counties in Texas. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- Mar 29, 2012, 5:57 PM CDT (22:57 UTC)
- Expired
- Mar 29, 2012, 7:00 PM CDT
- In force
- 63 min
- Issued by
- the Storm Prediction Center
Counties Coke County, TX, Crockett County, TX, Irion County, TX, Nolan County, TX, Reagan County, TX, Schleicher County, TX, Sterling County, TX, Tom Green County, TX
The radar
The San Angelo radar (KSJT), 57 km from the middle of the area, began a volume at 22:58 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
Midland Regional, TX (KMAF), launched 12:00Z, 11.0 hours before the alert went out and 141 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
- 706 J/kg
- Mixed-layer CIN
- -227 J/kg
- Mixed-layer LCL
- 1690 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 109 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
274
ACUS11 KWNS 292258
SWOMCD
SPC MCD 292257
TXZ000-300000-
MESOSCALE DISCUSSION 0383
NWS STORM PREDICTION CENTER NORMAN OK
0557 PM CDT THU MAR 29 2012
AREAS AFFECTED...SWRN/W-CNTRL TX
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 292257Z - 300000Z
A THREAT FOR ISOLATED SVR HAIL AND DMGG WIND GUSTS WILL EXIST
THROUGH AROUND 01Z OVER SWRN/W-CNTRL TX...BUT SHOULD BEGIN TO
DECREASE THEREAFTER. DUE TO THE EXPECTED ISOLATED/SHORT-LIVED NATURE
OF THE THREAT...A WW IS NOT ANTICIPATED.
STRONG SFC HEATING INVOF A DIFFUSE DRYLINE...ALONG WITH A WEAK
MIDLEVEL VORT MAX MOVING OVER NRN MEXICO...HAVE SUPPORTED ISOLATED
TSTM DEVELOPMENT ACROSS SWRN/W-CNTRL TX. ALTHOUGH BOUNDARY LAYER
MOISTURE REMAINS MODEST /SFC DEW POINTS IN THE MID-UPPER 50S PER 23Z
SFC ANALYSIS/...STEEP MIDLEVEL LAPSE RATES AND WARM SFC TEMPERATURES
HAVE YIELDED MLCAPE VALUES NEAR 2000 J/KG. WEAK/VEERING DEEP-LAYER
FLOW SHOULD SUPPORT DISCRETE PULSE TO SMALL MULTICELL
CLUSTERS...CAPABLE OF PRODUCING ISOLATED LARGE HAIL AND DMGG WINDS
/OWING TO DEEP-BOUNDARY LAYER MIXING AND LARGE SFC T-TD SPREADS/.
HOWEVER...ENVIRONMENTAL CONDITIONS WILL GRADUALLY BECOME LESS
FAVORABLE AFTER 01Z...OWING TO THE ONSET OF DIURNAL COOLING AND
INCREASING CINH.
..ROGERS.. 03/29/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...EWX...SJT...MAF...
LAT...LON 31960126 32380082 32380012 32029991 31190031 30050105
29790148 29830200 29990218 31960126SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 29, 4:50 PM CDT | Mesoscale Discussion | SPC | Hemphill, Lipscomb | 55 min |
| Mar 29, 5:27 PM CDT | Mesoscale Discussion | SPC | Aransas, Kenedy, Kleberg, Nueces, Refugio, San Patricio and 1 more | 63 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.