Alert archive / Virginia / Mesoscale Discussions in 2004
Mesoscale Discussion 2274
The Storm Prediction Center issued this mesoscale discussion at Sep 28, 2004, 8:56 AM EDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 28, 2004, 8:56 AM EDT (12:56 UTC)
- Expired
- Sep 28, 2004, 11:00 AM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
Counties Sussex County, DE, Dorchester County, MD, Somerset County, MD, Wicomico County, MD, Worcester County, MD, Camden County, NC, Currituck County, NC, Pasquotank County, NC, Tyrrell County, NC, Accomack County, VA, City of Norfolk, VA, City of Virginia Beach, VA, Mathews County, VA, Northampton County, VA, Northumberland County, VA
The radar
The Norfolk radar (KAKQ), 100 km from the middle of the area, began a volume at 13:00 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
Wallops Is Stn, VA (KWAL), launched 12:00Z, 0.9 hours before the alert went out and 87 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.
- Mixed-layer CAPE
- 1005 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 483 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 119 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.1
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 28, 1:49 PM EDT | Mesoscale Discussion | SPC | Kent, New Castle, Sussex | 116 min |
| Sep 28, 2:25 PM EDT | Tornado Watch | SPC | Kent, New Castle, Sussex | 7 hr |
| Sep 28, 4:36 PM EDT | Mesoscale Discussion | SPC | Kent, New Castle, Sussex | 114 min |
| Sep 28, 11:25 AM EDT | Tornado Watch | SPC | Calvert, Charles, Dorchester, Saint Mary's, Somerset, Wicomico and 1 more | 6 hr |
| Sep 27, 9:10 PM EDT | Tornado Watch | SPC | Anson, Bladen, Brunswick, Chatham, Columbus, Cumberland and 15 more | 7 hr |
| Sep 28, 12:46 AM EDT | Mesoscale Discussion | SPC | Anson, Bladen, Brunswick, Cabarrus, Chatham, Columbus and 16 more | 89 min |
| Sep 28, 2:59 AM EDT | Mesoscale Discussion | SPC | Chatham, Cumberland, Durham, Harnett, Johnston, Lee and 5 more | 2 hr |
Nearby
Mesoscale Discussions in Virginia, 2004Mesoscale Discussions in Maryland, 2004Mesoscale Discussions in North Carolina, 2004Every mesoscale discussion in 2004
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.