Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 130

March 17, 20186 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 17, 2018, 5:45 PM CDT for 6 counties in Texas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Mar 17, 2018, 5:45 PM CDT (22:45 UTC)
Expired
Mar 17, 2018, 7:15 PM CDT
In force
90 min
Issued by
the Storm Prediction Center
Chance of a watch
5%

Counties Caldwell County, TX, Comal County, TX, Guadalupe County, TX, Hays County, TX, Travis County, TX, Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 10 km from the middle of the area, began a volume at 22:49 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

Fort Worth, TX (KFWD), launched 12:00Z, 10.8 hours before the alert went out and 362 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, Fort Worth, TX at 12:00Z on 2018-03-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Fort Worth, TX at 12:00Z on 2018-03-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2469 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
-22 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 17, 1:15 PM CDTMesoscale DiscussionSPCAnderson, Bell, Bosque, Brown, Callahan, Cherokee and 30 more3 hr
Mar 17, 2:20 PM CDTSevere Thunderstorm WatchSPCAnderson, Bell, Bosque, Brown, Callahan, Coleman and 37 more9 hr
Mar 17, 5:25 PM CDTMesoscale DiscussionSPCAnderson, Bell, Coryell, Falls, Freestone, Henderson and 7 more2 hr

Nearby

Mesoscale Discussions in Texas, 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.