Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 196

March 29, 2018Calcasieu Parish, Cameron Parish, Louisiana; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 29, 2018, 3:17 AM CDT for Calcasieu Parish, Cameron Parish, Louisiana; 4 counties in Texas. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
Mar 29, 2018, 3:17 AM CDT (08:17 UTC)
Expired
Mar 29, 2018, 4:15 AM CDT
In force
58 min
Issued by
the Storm Prediction Center
Chance of a watch
20%

Counties Calcasieu Parish, LA, Cameron Parish, LA, Chambers County, TX, Galveston County, TX, Jefferson County, TX, Orange County, TX

The radar

The Lake Charles radar (KLCH), 86 km from the middle of the area, began a volume at 08:20 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 00:00Z, 8.3 hours before the alert went out and 87 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.

Skew-T log-pSkew-T log-p diagram, Lake Charles Mun, LA at 00:00Z on 2018-03-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1263 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 00:00Z on 2018-03-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 164 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1263 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
604 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
164 m²/s²
0-3 km storm-relative helicity
194 m²/s²
Significant tornado parameter
1.6
Supercell composite
9.7

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 28, 8:28 PM CDTMesoscale DiscussionSPCAllen, Beauregard, Calcasieu, Evangeline, Rapides, Vernon62 min
Mar 28, 7:36 PM CDTSevere Thunderstorm WatchSPCAransas, Atascosa, Bastrop, Bee, Bexar, Brooks and 29 more7 hr
Mar 28, 11:43 PM CDTMesoscale DiscussionSPCAransas, Bee, Brazoria, Brooks, Calhoun, Goliad and 13 more92 min

Nearby

Mesoscale Discussions in Texas, 2018Mesoscale Discussions in Louisiana, 2018Every mesoscale discussion in 2018

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.