Alert archive / Tennessee / Mesoscale Discussions in 2004

Mesoscale Discussion 2226

September 16, 20049 counties in North Carolina; 13 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Sep 16, 2004, 4:52 PM EDT for 9 counties in North Carolina; 13 counties in Tennessee. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Sep 16, 2004, 4:52 PM EDT (20:52 UTC)
Expired: Sep 16, 2004, 6:15 PM EDT
In force: 83 min
Issued by: the Storm Prediction Center

All 22 counties

Cherokee County, NC, Clay County, NC, Graham County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Macon County, NC, Swain County, NC, Transylvania County, NC, Blount County, TN, Bradley County, TN, Cocke County, TN, Hamilton County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Polk County, TN, Rhea County, TN, Sequatchie County, TN, Sevier County, TN

The radar

The Knoxville radar (KMRX), 106 km from the middle of the area, began a volume at 20:52 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

Nashville Metro, TN (KBNA), launched 12:00Z, 8.9 hours before the alert went out and 232 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: 172 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 781 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 16 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
Sep 16, 12:20 PM EDT	Tornado Watch	SPC	Robeson	9 hr
Sep 16, 6:38 PM EDT	Mesoscale Discussion	SPC	Robeson	2 hr

Nearby

Mesoscale Discussions in Tennessee, 2004 Mesoscale Discussions in North Carolina, 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.