Alert archive / North Carolina / Mesoscale Discussions in 2012

Mesoscale Discussion 1444

July 9, 201245 counties in North Carolina; 16 counties in Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 9, 2012, 4:48 PM EDT for 45 counties in North Carolina; 16 counties in Virginia. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Jul 9, 2012, 4:48 PM EDT (20:48 UTC)
Expired
Jul 9, 2012, 6:15 PM EDT
In force
87 min
Issued by
the Storm Prediction Center
All 61 counties

Anson County, NC, Beaufort County, NC, Bertie County, NC, Bladen County, NC, Camden County, NC, Chowan 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, Halifax County, NC, Harnett County, NC, Hertford County, NC, Hoke County, NC, Hyde County, NC, Johnston County, NC, Jones County, NC, Lee County, NC, Lenoir County, NC, Martin County, NC, Moore County, NC, Nash County, NC, Northampton County, NC, Onslow County, NC, Pamlico County, NC, Pasquotank County, NC, Perquimans County, NC, Pitt County, NC, Richmond County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Tyrrell County, NC, Union County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Washington County, NC, Wayne County, NC, Wilson County, NC, Appomattox County, VA, Brunswick County, VA, Charlotte County, VA, City of Chesapeake, VA, City of Emporia, VA, City of Franklin, VA, City of Suffolk, VA, Dinwiddie County, VA, Greensville County, VA, Isle of Wight County, VA, Lunenburg County, VA, Mecklenburg County, VA, Nottoway County, VA, Prince Edward County, VA, Southampton County, VA, Sussex County, VA

The radar

The Raleigh/Durham radar (KRAX), 40 km from the middle of the area, began a volume at 20:50 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 12:00Z, 8.8 hours before the alert went out and 116 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-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 12:00Z on 2012-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1054 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 12:00Z on 2012-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1054 J/kg
Mixed-layer CIN
-119 J/kg
Mixed-layer LCL
1186 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
31 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.

IssuedProductOfficeCountiesLasted
Jul 9, 1:01 PM EDTMesoscale DiscussionSPCAlexander, Avery, Buncombe, Burke, Caldwell, Catawba and 20 more89 min
Jul 9, 1:36 PM EDTMesoscale DiscussionSPCAlamance, Beaufort, Bertie, Caswell, Chatham, Chowan and 35 more54 min
Jul 9, 2:59 PM EDTSevere Thunderstorm WatchSPCAlamance, Beaufort, Bertie, Bladen, Camden, Carteret and 45 more7 hr
Jul 9, 3:19 PM EDTSevere Thunderstorm WatchSPCAlleghany, Ashe, Caswell, Rockingham, Stokes, Surry and 3 more4 hr
Jul 9, 5:53 PM EDTMesoscale DiscussionSPCAlamance, Alleghany, Caswell, Davie, Forsyth, Guilford and 7 more97 min
Jul 9, 7:17 PM EDTMesoscale DiscussionSPCAlamance, Beaufort, Bertie, Brunswick, Camden, Carteret and 25 more88 min
Jul 9, 12:09 AM EDTMesoscale DiscussionSPCArlington, Caroline, Clarke, Culpeper, Fairfax, Fauquier and 21 more96 min

Nearby

Mesoscale Discussions in North Carolina, 2012Mesoscale Discussions in Virginia, 2012Every mesoscale discussion in 2012

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.