Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 287

April 4, 20204 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2020, 6:18 AM CDT for 4 counties in Texas. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Apr 4, 2020, 6:18 AM CDT (11:18 UTC)
Expired
Apr 4, 2020, 8:15 AM CDT
In force
117 min
Issued by
the Storm Prediction Center
Chance of a watch
5%

Counties Cameron County, TX, Hidalgo County, TX, Starr County, TX, Willacy County, TX

The nearest sounding before it

Brownsville Intl, TX (KBRO), launched 00:00Z, 11.3 hours before the alert went out and 92 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, Brownsville Intl, TX at 00:00Z on 2020-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1520 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, Brownsville Intl, TX at 00:00Z on 2020-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.1939587897Sfc1 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
1520 J/kg
Mixed-layer CIN
-133 J/kg
Mixed-layer LCL
774 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
112 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.6

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
Apr 3, 8:59 PM CDTMesoscale DiscussionSPCBrooks, Dimmit, Duval, Jim Hogg, Jim Wells, Kleberg and 5 more91 min

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.