Alert archive / North Carolina / Mesoscale Discussions in 2009

Mesoscale Discussion 894

May 29, 20094 states

The Storm Prediction Center issued this mesoscale discussion at May 29, 2009, 6:01 PM EDT for 4 states. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: May 29, 2009, 6:01 PM EDT (22:01 UTC)
Expired: May 29, 2009, 7:00 PM EDT
In force: 59 min
Issued by: the Storm Prediction Center

All 128 counties

Bryan County, GA, Bulloch County, GA, Chatham County, GA, Effingham County, GA, Evans County, GA, Liberty County, GA, Long County, GA, Screven County, GA, Alamance County, NC, Anson County, NC, Beaufort County, NC, Bertie County, NC, Bladen County, NC, Brunswick County, NC, Caswell County, NC, Chatham County, NC, Chowan County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Duplin County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Granville County, NC, Greene County, NC, Guilford County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Hoke County, NC, Johnston County, NC, Jones County, NC, Lee County, NC, Lenoir County, NC, Martin County, NC, Montgomery County, NC, Moore County, NC, Nash County, NC, New Hanover County, NC, Northampton County, NC, Onslow County, NC, Orange County, NC, Pender County, NC, Perquimans County, NC, Person County, NC, Pitt County, NC, Randolph County, NC, Richmond County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Stanly County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Allendale County, SC, Bamberg County, SC, Beaufort County, SC, Berkeley County, SC, Calhoun County, SC, Charleston County, SC, Chesterfield County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Florence County, SC, Georgetown County, SC, Hampton County, SC, Horry County, SC, Jasper County, SC, Kershaw County, SC, Lee County, SC, Marion County, SC, Marlboro County, SC, Orangeburg County, SC, Richland County, SC, Sumter County, SC, Williamsburg County, SC, Amelia County, VA, Appomattox County, VA, Brunswick County, VA, Campbell County, VA, Charles City County, VA, Charlotte County, VA, Chesterfield County, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Danville, VA, City of Emporia, VA, City of Franklin, VA, City of Hampton, VA, City of Hopewell, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Williamsburg, VA, Cumberland County, VA, Dinwiddie County, VA, Gloucester County, VA, Greensville County, VA, Halifax County, VA, Henrico County, VA, Isle of Wight County, VA, James City County, VA, Lunenburg County, VA, Mathews County, VA, Mecklenburg County, VA, New Kent County, VA, Northampton County, VA, Nottoway County, VA, Pittsylvania County, VA, Prince Edward County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, York County, VA

The radar

The Wilmington radar (KLTX), 54 km from the middle of the area, began a volume at 22:03 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.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 10.0 hours before the alert went out and 154 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: 2514 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 668 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 78 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
May 29, 2:41 PM EDT	Severe Thunderstorm Watch	SPC	Bryan, Bulloch, Candler, Chatham, Effingham, Evans and 4 more	8 hr
May 29, 2:22 PM EDT	Mesoscale Discussion	SPC	Alamance, Anson, Beaufort, Bertie, Bladen, Brunswick and 47 more	23 min
May 29, 12:20 PM EDT	Mesoscale Discussion	SPC	Albemarle, Arlington, Caroline, Clarke, Culpeper, Essex and 26 more	55 min
May 29, 1:26 PM EDT	Severe Thunderstorm Watch	SPC	Accomack, Albemarle, Amherst, Arlington, Buckingham, Caroline and 37 more	8 hr
May 29, 4:30 PM EDT	Mesoscale Discussion	SPC	Albemarle, Amherst, Arlington, Buckingham, Caroline, Culpeper and 35 more	60 min
May 29, 6:20 PM EDT	Mesoscale Discussion	SPC	Arlington, Buckingham, Caroline, Cumberland, Essex, Fairfax and 24 more	55 min

Nearby

Mesoscale Discussions in North Carolina, 2009 Mesoscale Discussions in Virginia, 2009 Mesoscale Discussions in South Carolina, 2009 Every mesoscale discussion in 2009

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.