Alert archive / North Carolina / Mesoscale Discussions in 2003

Mesoscale Discussion 1769

July 10, 200311 counties in North Carolina; 4 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2003, 9:29 PM EDT for 11 counties in North Carolina; 4 counties in Tennessee. It was in force for 31 min.

The area

The outline as issued.

The facts

Issued: Jul 10, 2003, 9:29 PM EDT (01:29 UTC)
Expired: Jul 10, 2003, 10:00 PM EDT
In force: 31 min
Issued by: the Storm Prediction Center

Counties Alleghany County, NC, Ashe County, NC, Avery County, NC, Buncombe County, NC, Haywood County, NC, Jackson County, NC, Madison County, NC, Mitchell County, NC, Transylvania County, NC, Watauga County, NC, Yancey County, NC, Carter County, TN, Johnson County, TN, Sullivan County, TN, Unicoi County, TN

The radar

The Knoxville radar (KMRX), 107 km from the middle of the area, began a volume at 01:33 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

Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 1.5 hours before the alert went out and 210 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: 1414 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 1147 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 82 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 11, 12:45 PM EDT	Mesoscale Discussion	SPC	Anson, Beaufort, Bertie, Bladen, Camden, Chatham and 41 more	2 hr
Jul 11, 1:55 PM EDT	Severe Thunderstorm Watch	SPC	Anson, Scotland, Union	6 hr
Jul 11, 4:10 PM EDT	Severe Thunderstorm Watch	SPC	Alamance, Anson, Bertie, Cabarrus, Camden, Caswell and 44 more	4 hr
Jul 11, 4:49 PM EDT	Mesoscale Discussion	SPC	Scotland	116 min
Jul 11, 6:34 PM EDT	Mesoscale Discussion	SPC	Beaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 42 more	86 min
Jul 11, 7:05 PM EDT	Severe Thunderstorm Watch	SPC	Beaufort, Bertie, Bladen, Brunswick, Camden, Chowan and 22 more	6 hr

Nearby

Mesoscale Discussions in North Carolina, 2003 Mesoscale Discussions in Tennessee, 2003 Every mesoscale discussion in 2003

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.