Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 754

May 28, 2020Galveston County, Texas

The Storm Prediction Center issued this mesoscale discussion at May 28, 2020, 3:01 PM CDT for Galveston County, Texas. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
May 28, 2020, 3:01 PM CDT (20:01 UTC)
Expired
May 28, 2020, 5:00 PM CDT
In force
119 min
Issued by
the Storm Prediction Center
Concerning
Severe potential...watch unlikely
Chance of a watch
20%

County Galveston County, TX

The radar

The Houston radar (KHGX), 16 km from the middle of the area, began a volume at 20:03 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, 8.0 hours before the alert went out and 195 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 12:00Z on 2020-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 117 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2020-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 220 square meters per square second.19395878Sfc1 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
117 J/kg
Mixed-layer CIN
-237 J/kg
Mixed-layer LCL
1285 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
220 m²/s²
0-3 km storm-relative helicity
239 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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
May 27, 7:11 PM CDTMesoscale DiscussionSPCBexar, Comal, Guadalupe, Kendall, Wilson2 hr
May 27, 9:35 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, DeWitt, Frio, Gonzales and 5 more115 min
May 28, 1:44 PM CDTMesoscale DiscussionSPCBandera, Bexar, Concho, Crockett, Edwards, Gillespie and 19 more2 hr
May 28, 2:26 PM CDTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bexar, Blanco, Comal, Dimmit and 16 more5 hr
May 28, 6:29 PM CDTMesoscale DiscussionSPCAransas, Atascosa, Bee, Caldwell, Calhoun, Colorado and 22 more2 hr

Nearby

Mesoscale Discussions in Texas, 2020Every mesoscale discussion in 2020

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.