Alert archive / North Carolina / Mesoscale Discussions in 2003

Mesoscale Discussion 2424

September 27, 20036 states

The Storm Prediction Center issued this mesoscale discussion at Sep 27, 2003, 2:41 PM EDT for 6 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Sep 27, 2003, 2:41 PM EDT (18:41 UTC)
Expired: Sep 27, 2003, 4:45 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 62 counties

Fannin County, GA, Gilmer County, GA, Habersham County, GA, Lumpkin County, GA, Rabun County, GA, Stephens County, GA, Towns County, GA, Union County, GA, White County, GA, Alexander County, NC, Alleghany County, NC, Ashe County, NC, Avery County, NC, Buncombe County, NC, Burke County, NC, Caldwell County, NC, Clay County, NC, Haywood County, NC, Henderson County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, McDowell County, NC, Mitchell County, NC, Polk County, NC, Rutherford County, NC, Stokes County, NC, Surry County, NC, Transylvania County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Yancey County, NC, Oconee County, SC, Pickens County, SC, Carter County, TN, Johnson County, TN, Unicoi County, TN, Alleghany County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Carroll County, VA, City of Covington, VA, City of Galax, VA, City of Martinsville, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Floyd County, VA, Franklin County, VA, Giles County, VA, Grayson County, VA, Henry County, VA, Montgomery County, VA, Patrick County, VA, Pulaski County, VA, Roanoke County, VA, Smyth County, VA, Wythe County, VA, Monroe County, WV

The radar

The Knoxville radar (KMRX), 110 km from the middle of the area, began a volume at 18:40 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

Roanoke, VA (KRNK), launched 12:00Z, 6.7 hours before the alert went out and 274 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: 55 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 652 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 129 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 27, 11:42 AM EDT	Mesoscale Discussion	SPC	Dade	108 min
Sep 27, 3:12 AM EDT	Mesoscale Discussion	SPC	Benton, Cannon, Carroll, Cheatham, Clay, Davidson and 27 more	93 min
Sep 27, 2:22 PM EDT	Mesoscale Discussion	SPC	Clarke, Frederick, Loudoun, Shenandoah, Warren, City of Winchester	113 min
Sep 27, 4:05 PM EDT	Severe Thunderstorm Watch	SPC	Augusta, Frederick, Highland, Page, Rockingham, Shenandoah and 4 more	5 hr
Sep 27, 6:52 PM EDT	Mesoscale Discussion	SPC	Amherst, Augusta, Bedford, Botetourt, Frederick, Page and 10 more	53 min
Sep 27, 12:06 AM EDT	Mesoscale Discussion	SPC	Brooke, Hancock, Marshall, Ohio	84 min
Sep 27, 12:40 AM EDT	Tornado Watch	SPC	Hancock	5 hr
Sep 27, 3:37 AM EDT	Mesoscale Discussion	SPC	Brooke, Hancock, Marshall, Ohio	113 min
Sep 27, 5:15 AM EDT	Mesoscale Discussion	SPC	Hancock	60 min

Nearby

Mesoscale Discussions in North Carolina, 2003 Mesoscale Discussions in Virginia, 2003 Mesoscale Discussions in Georgia, 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.