Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 930
The Storm Prediction Center issued this mesoscale discussion at May 27, 2012, 7:37 PM CDT for Terrell County, Texas. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- May 27, 2012, 7:37 PM CDT (00:37 UTC)
- Expired
- May 27, 2012, 8:30 PM CDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 5%
County Terrell County, TX
The radar
The Midland/Odessa radar (KMAF), 184 km from the middle of the area, began a volume at 00:37 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 nearest sounding before it
Del Rio, TX (KDRT), launched 00:00Z, 0.6 hours before the alert went out and 171 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
- 1285 J/kg
- Mixed-layer CIN
- -103 J/kg
- Mixed-layer LCL
- 1535 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 4.0
The text
As transmitted, in the capitals the NWS used until 2016.
478 ACUS11 KWNS 280038 SWOMCD SPC MCD 280037 TXZ000-280130- MESOSCALE DISCUSSION 0930 NWS STORM PREDICTION CENTER NORMAN OK 0737 PM CDT SUN MAY 27 2012 AREAS AFFECTED...SWRN TX CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY VALID 280037Z - 280130Z PROBABILITY OF WATCH ISSUANCE...5 PERCENT SUMMARY...THREAT FOR VERY LARGE HAIL AND A TORNADO EXPECTED TO PERSIST UNTIL AROUND 0130Z WITH STORM OVER SWRN TX BETWEEN FORT STOCKTON AND SANDERSON. ON IT PRESENT COURSE THE STORM MAY AFFECT THE TOWN OF SANDERSON BY 01Z. DUE TO THE LIMITED DURATION AND AREAL EXTENT OF THE SEVERE THREAT...A WW IS NOT ANTICIPATED. DISCUSSION...ISOLATED SUPERCELL STORM THAT DEVELOPED OVER THE HIGHER TERRAIN OF SWRN TX IS LOCATED ABOUT 25 SM NW OF SANDERSON TX MOVING SEWD. THE ENVIRONMENT WITHIN WHICH THIS STORM IS DEVELOPING IS CHARACTERIZED BY 2500 J/KG MLCAPE...50 KT EFFECTIVE SHEAR AND SUFFICIENT 0-1 KM SHEAR FOR LOW LEVEL MESOCYCLONES. RECENT RADAR TRENDS HAVE BEEN FOR THIS STORM TO DECREASE IN SIZE AND INTENSITY. INCREASING CONVECTIVE INHIBITION ASSOCIATED WITH ONSET OF NOCTURNAL COOLING WILL PROBABLY RESULT IN A CONTINUED GRADUAL DECREASE AND EVENTUAL DISSIPATION. IN THE MEANTIME...THE STORM WILL REMAIN CAPABLE OF VERY LARGE HAIL AND A TORNADO THROUGH ABOUT 01-0130Z. ..DIAL/HART.. 05/28/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...EWX...MAF... LAT...LON 30620220 29960167 29840256 30430266 30620220
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 28, 2:54 PM CDT | Mesoscale Discussion | SPC | Andrews, Archer, Baylor, Borden, Cottle, Crane and 30 more | 96 min |
| May 28, 3:48 PM CDT | Severe Thunderstorm Watch | SPC | Archer, Baylor, Borden, Brown, Callahan, Clay and 47 more | 8 hr |
| May 28, 6:14 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Borden, Clay, Dawson, Dickens and 23 more | 91 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.