Alert archive / North Carolina / Mesoscale Discussions in 2007

Mesoscale Discussion 507

April 15, 200725 counties in North Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2007, 2:40 PM EDT for 25 counties in North Carolina. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued
Apr 15, 2007, 2:40 PM EDT (18:40 UTC)
Expired
Apr 15, 2007, 3:45 PM EDT
In force
65 min
Issued by
the Storm Prediction Center
All 25 counties

Beaufort County, NC, Bladen County, NC, Brunswick County, NC, Carteret County, NC, Columbus County, NC, Craven County, NC, Cumberland County, NC, Dare County, NC, Duplin County, NC, Greene County, NC, Hyde County, NC, Jones County, NC, Lenoir County, NC, Martin County, NC, New Hanover County, NC, Onslow County, NC, Pamlico County, NC, Pender County, NC, Pitt County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Tyrrell County, NC, Washington County, NC, Wayne County, NC

The radar

The Morehead City radar (KMHX), 35 km from the middle of the area, began a volume at 18:43 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Newport, NC (KMHX), launched 12:00Z, 6.7 hours before the alert went out and 35 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, Newport, NC at 12:00Z on 2007-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 188 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, Newport, NC at 12:00Z on 2007-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 343 square meters per square second.1939587897Sfc1 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
188 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
594 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
343 m²/s²
0-3 km storm-relative helicity
397 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.5

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
Apr 14, 10:10 PM EDTMesoscale DiscussionSPCAnson, Union95 min
Apr 15, 2:01 AM EDTTornado WatchSPCBladen, Brunswick, Columbus, New Hanover, Pender, Robeson7 hr
Apr 15, 3:33 AM EDTMesoscale DiscussionSPCAlamance, Anson, Cabarrus, Chatham, Cumberland, Davidson and 21 more87 min
Apr 15, 7:39 AM EDTMesoscale DiscussionSPCBeaufort, Bladen, Brunswick, Chatham, Columbus, Craven and 26 more66 min
Apr 15, 8:08 AM EDTTornado WatchSPCBeaufort, Bladen, Brunswick, Carteret, Columbus, Craven and 29 more7 hr
Apr 15, 11:15 AM EDTMesoscale DiscussionSPCBeaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 37 more2 hr
Apr 15, 12:19 PM EDTMesoscale DiscussionSPCAlamance, Alexander, Anson, Cabarrus, Caswell, Catawba and 29 more86 min
Apr 15, 12:42 PM EDTTornado WatchSPCAlamance, Alexander, Anson, Bertie, Burke, Cabarrus and 44 more7 hr
Apr 15, 2:50 PM EDTTornado WatchSPCBeaufort, Carteret, Craven, Cumberland, Dare, Duplin and 14 more5 hr
Apr 15, 4:12 PM EDTMesoscale DiscussionSPCAlamance, Beaufort, Bertie, Camden, Carteret, Chatham and 41 more2 hr

Nearby

Mesoscale Discussions in North Carolina, 2007Every mesoscale discussion 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.