Alert archive / Tennessee / Mesoscale Discussions in 2004

Mesoscale Discussion 2342

October 19, 200413 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Oct 19, 2004, 3:10 PM CDT for 13 counties in Tennessee. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Oct 19, 2004, 3:10 PM CDT (20:10 UTC)
Expired: Oct 19, 2004, 5:45 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Carroll County, TN, Chester County, TN, Crockett County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Madison County, TN, McNairy County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 103 km from the middle of the area, began a volume at 20:13 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

Little Rock, AR (KLZK), launched 12:00Z, 8.2 hours before the alert went out and 141 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: 2047 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 694 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 6.7

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
Oct 18, 8:00 PM CDT	Tornado Watch	SPC	Bedford, Benton, Carroll, Cheatham, Chester, Crockett and 38 more	3 hr
Oct 18, 9:09 PM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Cheatham, Chester, Crockett, Davidson and 33 more	2 hr
Oct 18, 10:33 PM CDT	Mesoscale Discussion	SPC	Bedford, Benton, Bledsoe, Cannon, Carroll, Cheatham and 58 more	117 min
Oct 18, 10:55 PM CDT	Tornado Watch	SPC	Bedford, Benton, Cannon, Carroll, Cheatham, Chester and 42 more	5 hr
Oct 19, 2:04 AM CDT	Mesoscale Discussion	SPC	Benton, Bledsoe, Carroll, Cheatham, Clay, Crockett and 33 more	86 min
Oct 19, 3:34 AM CDT	Mesoscale Discussion	SPC	Bedford, Bledsoe, Bradley, Cannon, Chester, Coffee and 28 more	26 min
Oct 19, 3:50 AM CDT	Severe Thunderstorm Watch	SPC	Franklin, Lincoln, Marion	4 hr

Nearby

Mesoscale Discussions in Tennessee, 2004 Every mesoscale discussion in 2004

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.