Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 151

March 26, 2015Cameron County, Hidalgo County, Willacy County, Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 26, 2015, 12:30 PM CDT for Cameron County, Hidalgo County, Willacy County, Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Mar 26, 2015, 12:30 PM CDT (17:30 UTC)
Expired
Mar 26, 2015, 2:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
5%

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

The radar

The Brownsville radar (KBRO), 75 km from the middle of the area, began a volume at 17:31 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

Brownsville Intl, TX (KBRO), launched 12:00Z, 5.5 hours before the alert went out and 77 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 12:00Z on 2015-03-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2435 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 12:00Z on 2015-03-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
2435 J/kg
Mixed-layer CIN
-125 J/kg
Mixed-layer LCL
476 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
51 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 25, 11:39 PM CDTMesoscale DiscussionSPCCooke, Denton, Fannin, Grayson, Lamar, Wise96 min
Mar 26, 2:17 AM CDTMesoscale DiscussionSPCBowie, Delta, Franklin, Hopkins, Lamar, Red River and 1 more58 min

Nearby

Mesoscale Discussions in Texas, 2015Every mesoscale discussion in 2015

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.