Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 601

April 29, 201717 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2017, 8:57 PM CDT for 17 counties in Texas. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Apr 29, 2017, 8:57 PM CDT (01:57 UTC)
Expired: Apr 29, 2017, 10:00 PM CDT
In force: 63 min
Issued by: the Storm Prediction Center

Counties Bastrop County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Fayette County, TX, Gonzales County, TX, Grimes County, TX, Guadalupe County, TX, Houston County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Milam County, TX, Robertson County, TX, Travis County, TX, Washington County, TX

The radar

The Ft Hood radar (KGRK), 57 km from the middle of the area, began a volume at 01:59 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

Corpus Christi, TX (KCRP), launched 00:00Z, 2.0 hours before the alert went out and 283 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 4355 J/kg
Mixed-layer CIN: -249 J/kg
Mixed-layer LCL: 1127 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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.

Issued	Product	Office	Counties	Lasted
Apr 29, 7:34 PM CDT	Mesoscale Discussion	SPC	Anderson, Delta, Fannin, Franklin, Freestone, Henderson and 11 more	56 min
Apr 29, 9:38 PM CDT	Mesoscale Discussion	SPC	Bowie, Cass, Gregg, Harrison, Marion, Morris and 4 more	67 min
Apr 29, 10:23 PM CDT	Severe Thunderstorm Watch	SPC	Angelina, Bowie, Cass, Gregg, Harrison, Marion and 6 more	8 hr
Apr 29, 11:37 PM CDT	Mesoscale Discussion	SPC	Cass, Harrison, Marion, Nacogdoches, Panola, Rusk and 3 more	53 min
Apr 30, 1:14 AM CDT	Mesoscale Discussion	SPC	Chambers, Hardin, Jasper, Jefferson, Liberty, Newton and 2 more	91 min
Apr 30, 1:25 AM CDT	Mesoscale Discussion	SPC	Dallam, Sherman	6 hr

Nearby

Mesoscale Discussions in Texas, 2017 Every mesoscale discussion in 2017

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.