Alert archive / Texas / Mesoscale Discussions in 2013
Mesoscale Discussion 2
The Storm Prediction Center issued this mesoscale discussion at Jan 8, 2013, 7:02 AM CST for Chambers County, Galveston County, Texas. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Jan 8, 2013, 7:02 AM CST (13:02 UTC)
- Expired
- Jan 8, 2013, 8:30 AM CST
- In force
- 88 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 5%
Counties Chambers County, TX, Galveston County, TX
The radar
The Houston radar (KHGX), 40 km from the middle of the area, began a volume at 13:03 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
Lake Charles Mun, LA (KLCH), launched 12:00Z, 1.0 hours before the alert went out and 204 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
- 528 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 258 m²/s²
- 0-3 km storm-relative helicity
- 289 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
640
ACUS11 KWNS 081302
SWOMCD
SPC MCD 081302
TXZ000-081430-
MESOSCALE DISCUSSION 0002
NWS STORM PREDICTION CENTER NORMAN OK
0702 AM CST TUE JAN 08 2013
AREAS AFFECTED...UPPER TX COAST
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 081302Z - 081430Z
PROBABILITY OF WATCH ISSUANCE...5 PERCENT
SUMMARY...A NEAR-SHORE SEVERE/WATERSPOUT POTENTIAL COULD OCCUR ALONG
THE UPPER TX COAST THIS MORNING...ALTHOUGH ANY SUCH POTENTIAL SHOULD
REMAIN VERY ISOLATED /AND OF SHORT DURATION/ THIS MORNING. NO WATCH
IS ANTICIPATED.
DISCUSSION...RECENT RADAR IMAGERY /SINCE 1230Z/ IS INDICATIVE OF A
STORM WITH UPDRAFT ROTATION JUST OFF THE UPPER TX COAST...SOUTHWEST
OF THE FREEPORT TX VICINITY AS OF 1250Z. THIS TSTM IS LIKELY
OCCURRING VERY NEAR/PERHAPS JUST A BIT NORTH OF A SHARPENING WARM
FRONT THAT DEMARCATES RELATIVELY COOL CONTINENTAL TRAJECTORIES
INLAND AND A MORE MOISTURE-RICH AIR MASS /60S F SURFACE DEWPOINTS/
OVER THE WESTERN GULF OF MEXICO. WHILE LOW-LEVEL/DEEP LAYER SHEAR IS
MORE THAN ADEQUATE FOR SUPERCELLS PER A LONG-CURVING HODOGRAPH PER
THE HOUSTON WSR-88D VWP...THIS STORM SHOULD TEND TO REMAIN OFFSHORE
FAVORING THE NEARLY-STALLED SURFACE BOUNDARY AND/OR BECOME
INCREASINGLY ELEVATED TOWARD THE COAST. WHILE A NEAR-SHORE SEVERE
POTENTIAL CANNOT BE RULED OUT INCLUDING THE POSSIBILITY OF
WATERSPOUTS...IT SHOULD REMAIN MARGINAL/ISOLATED.
..GUYER/CORFIDI.. 01/08/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LCH...HGX...
LAT...LON 28429543 28919559 29319523 29739486 29779414 29309408
28429543SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 8, 3:53 PM CST | Mesoscale Discussion | SPC | Atascosa, Bandera, Dimmit, Frio, Gillespie, Jim Hogg and 13 more | 3 hr |
Nearby
Mesoscale Discussions in Texas, 2013Every mesoscale discussion in 2013
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.