Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 1589

August 27, 2017Morton County, Stevens County, Kansas; Cimarron County, Texas County, Oklahoma; 9 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2017, 7:45 PM CDT for Morton County, Stevens County, Kansas; Cimarron County, Texas County, Oklahoma; 9 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 27, 2017, 7:45 PM CDT (00:45 UTC)
Expired: Aug 27, 2017, 9:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Morton County, KS, Stevens County, KS, Cimarron County, OK, Texas County, OK, Carson County, TX, Dallam County, TX, Hansford County, TX, Hartley County, TX, Hutchinson County, TX, Moore County, TX, Oldham County, TX, Potter County, TX, Sherman County, TX

The radar

The Amarillo radar (KAMA), 98 km from the middle of the area, began a volume at 00:48 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 0.8 hours before the alert went out and 99 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: 670 J/kg
Mixed-layer CIN: -119 J/kg
Mixed-layer LCL: 1915 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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
Aug 27, 9:50 PM CDT	Mesoscale Discussion	SPC	Brazoria, Chambers, Fort Bend, Galveston, Harris, Jefferson and 2 more	115 min
Aug 28, 1:51 AM CDT	Tornado Watch	SPC	Chambers, Hardin, Jefferson, Liberty, Orange	10 hr
Aug 28, 3:00 AM CDT	Mesoscale Discussion	SPC	Jefferson	60 min
Aug 28, 11:37 AM CDT	Mesoscale Discussion	SPC	Chambers, Galveston, Jefferson, Orange	83 min
Aug 28, 12:16 PM CDT	Tornado Watch	SPC	Jefferson, Orange	12 hr
Aug 28, 3:58 PM CDT	Mesoscale Discussion	SPC	Jefferson, Orange	92 min
Aug 28, 6:49 PM CDT	Mesoscale Discussion	SPC	Jefferson, Orange	116 min

Nearby

Mesoscale Discussions in Texas, 2017 Mesoscale Discussions in Kansas, 2017 Mesoscale Discussions in Oklahoma, 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.