Alert archive / North Carolina / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 80

March 28, 200737 counties in North Carolina; 19 counties in Virginia

The Storm Prediction Center issued this severe thunderstorm watch at Mar 28, 2007, 3:03 PM EDT for 37 counties in North Carolina; 19 counties in Virginia. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Mar 28, 2007, 3:03 PM EDT (19:03 UTC)
Expired: Mar 28, 2007, 9:59 PM EDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 56 counties

Alamance County, NC, Alleghany County, NC, Ashe County, NC, Beaufort County, NC, Caswell County, NC, Chatham County, NC, Dare County, NC, Davidson County, NC, Durham County, NC, Edgecombe County, NC, Forsyth County, NC, Franklin County, NC, Granville County, NC, Greene County, NC, Guilford County, NC, Halifax County, NC, Hyde County, NC, Johnston County, NC, Martin County, NC, Nash County, NC, Orange County, NC, Person County, NC, Pitt County, NC, Randolph County, NC, Rockingham County, NC, Stokes County, NC, Surry County, NC, Tyrrell County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Washington County, NC, Watauga County, NC, Wayne County, NC, Wilkes County, NC, Wilson County, NC, Yadkin County, NC, Bland County, VA, Carroll County, VA, City of Danville, VA, City of Galax, VA, City of Martinsville, VA, City of Radford, VA, Floyd County, VA, Franklin County, VA, Giles County, VA, Grayson County, VA, Halifax County, VA, Henry County, VA, Montgomery County, VA, Patrick County, VA, Pittsylvania County, VA, Pulaski County, VA, Smyth County, VA, Tazewell County, VA, Wythe County, VA

The radar

The Raleigh/Durham radar (KRAX), 87 km from the middle of the area, began a volume at 19:03 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 10%
One or more EF2 to EF5 tornadoes: 5%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 40%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

27 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Mar 28, 3:12 PM EDT	Severe Thunderstorm Warning	RNK	Montgomery, Pulaski	78 min
Mar 28, 3:20 PM EDT	Severe Thunderstorm Warning	RNK	Montgomery	70 min
Mar 28, 3:21 PM EDT	Severe Thunderstorm Warning	RAH	Nash	54 min
Mar 28, 3:22 PM EDT	Severe Thunderstorm Warning	RAH	Granville	38 min
Mar 28, 3:33 PM EDT	Flash Flood Warning	RAH	Halifax, Nash	3 hr
Mar 28, 3:49 PM EDT	Severe Thunderstorm Warning	RNK	Ashe	71 min
Mar 28, 3:56 PM EDT	Severe Thunderstorm Warning	RAH	Franklin, Warren	49 min
Mar 28, 3:58 PM EDT	Severe Thunderstorm Warning	RAH	Granville	47 min
Mar 28, 4:01 PM EDT	Flash Flood Warning	RAH	Granville	3 hr
Mar 28, 4:02 PM EDT	Severe Thunderstorm Warning	MHX	Beaufort	43 min
Mar 28, 4:10 PM EDT	Severe Thunderstorm Warning	RNK	Grayson	65 min
Mar 28, 4:15 PM EDT	Severe Thunderstorm Warning	RAH	Nash	45 min
Mar 28, 4:21 PM EDT	Severe Thunderstorm Warning	RAH	Vance	21 min
Mar 28, 4:25 PM EDT	Severe Thunderstorm Warning	RAH	Edgecombe	65 min
Mar 28, 4:28 PM EDT	Severe Thunderstorm Warning	RNK	Pulaski	47 min
Mar 28, 4:44 PM EDT	Severe Thunderstorm Warning	MHX	Beaufort	31 min
Mar 28, 4:52 PM EDT	Flash Flood Warning	RNK	Ashe	4 hr
Mar 28, 5:07 PM EDT	Severe Thunderstorm Warning	RAH	Person	38 min
Mar 28, 5:09 PM EDT	Severe Thunderstorm Warning	MHX	Pitt	66 min
Mar 28, 5:22 PM EDT	Severe Thunderstorm Warning	RNK	Henry, City of Martinsville	83 min
Mar 28, 5:35 PM EDT	Tornado Warning	MHX	Pitt	25 min
Mar 28, 5:44 PM EDT	Severe Thunderstorm Warning	RAH	Person	31 min
Mar 28, 5:45 PM EDT	Severe Thunderstorm Warning	RNK	Pittsylvania, City of Danville	90 min
Mar 28, 6:12 PM EDT	Severe Thunderstorm Warning	MHX	Hyde	48 min
Mar 28, 6:27 PM EDT	Severe Thunderstorm Warning	RNK	Franklin	51 min
Mar 28, 6:37 PM EDT	Severe Thunderstorm Warning	RAH	Person	30 min
Mar 28, 7:48 PM EDT	Severe Thunderstorm Warning	RNK	Rockingham	48 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 7.1 hours before the alert went out and 76 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: 842 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 1339 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 28, 12:50 PM EDT	Mesoscale Discussion	SPC	Alleghany, Ashe, Avery, Buncombe, Graham, Haywood and 7 more	85 min
Mar 28, 2:33 PM EDT	Mesoscale Discussion	SPC	Alamance, Alexander, Alleghany, Ashe, Avery, Buncombe and 41 more	117 min

Nearby

Severe Thunderstorm Watches in North Carolina, 2007 Severe Thunderstorm Watches in Virginia, 2007 Every severe thunderstorm watch in 2007

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.