Alert archive / Texas / Mesoscale Discussions in 2005

Mesoscale Discussion 1797

July 20, 200513 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2005, 12:42 PM CDT for 13 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 20, 2005, 12:42 PM CDT (17:42 UTC)
Expired: Jul 20, 2005, 2:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Tornado watch 650

Counties Brooks County, TX, Cameron County, TX, Duval County, TX, Hidalgo County, TX, Jim Hogg County, TX, Jim Wells County, TX, Kenedy County, TX, Kleberg County, TX, Nueces County, TX, Starr County, TX, Webb County, TX, Willacy County, TX, Zapata County, TX

The radar

The Corpus Christi radar (KCRP), 98 km from the middle of the area, began a volume at 17:42 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 12:00Z, 5.7 hours before the alert went out and 103 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: 1529 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 798 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 124 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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.

Issued	Product	Office	Counties	Lasted
Jul 19, 10:01 PM CDT	Mesoscale Discussion	SPC	Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 6 more	89 min
Jul 20, 12:55 AM CDT	Tornado Watch	SPC	Brooks, Cameron, Hidalgo, Kenedy, Starr, Willacy and 1 more	9 hr
Jul 20, 9:24 AM CDT	Mesoscale Discussion	SPC	Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 5 more	96 min
Jul 20, 9:40 AM CDT	Tornado Watch	SPC	Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 7 more	9 hr
Jul 20, 5:08 PM CDT	Mesoscale Discussion	SPC	Bee, Brooks, Duval, Hidalgo, Jim Hogg, Jim Wells and 9 more	2 hr

Nearby

Mesoscale Discussions in Texas, 2005 Every mesoscale discussion in 2005

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.