Alert archive / North Carolina / Severe Thunderstorm Watches in 2009
Severe Thunderstorm Watch 749
The Storm Prediction Center issued this severe thunderstorm watch at Sep 28, 2009, 5:47 PM EDT for 29 counties in North Carolina; 18 counties in Virginia. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 28, 2009, 5:47 PM EDT (21:47 UTC)
- Expired
- Sep 28, 2009, 10:00 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 47 counties
Alamance County, NC, Bertie County, NC, Camden County, NC, Chatham County, NC, Chowan County, NC, Currituck County, NC, Davidson County, NC, Durham County, NC, Edgecombe County, NC, Franklin County, NC, Gates County, NC, Granville County, NC, Guilford County, NC, Halifax County, NC, Harnett County, NC, Hertford County, NC, Johnston County, NC, Lee County, NC, Nash County, NC, Northampton County, NC, Orange County, NC, Pasquotank County, NC, Perquimans County, NC, Person County, NC, Randolph County, NC, Vance County, NC, Wake County, NC, Warren County, NC, Wilson County, NC, Brunswick County, VA, City of Chesapeake, 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 Portsmouth, VA, City of Suffolk, VA, City of Virginia Beach, VA, Dinwiddie County, VA, Greensville County, VA, Isle of Wight County, VA, Prince George County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA
The radar
The Norfolk radar (KAKQ), 90 km from the middle of the area, began a volume at 21:49 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
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 28, 5:53 PM EDT | Severe Thunderstorm Warning | RAH | Davidson, Guilford, Randolph | 37 min |
| Sep 28, 5:59 PM EDT | Severe Thunderstorm Warning | AKQ | Amelia, Brunswick, Charles City, Chesterfield, Dinwiddie, Greensville and 7 more | 61 min |
| Sep 28, 6:13 PM EDT | Severe Thunderstorm Warning | RAH | Durham, Granville, Orange, Wake | 62 min |
| Sep 28, 6:24 PM EDT | Severe Thunderstorm Warning | RAH | Durham, Granville, Person, Vance | 40 min |
| Sep 28, 6:26 PM EDT | Severe Thunderstorm Warning | RAH | Alamance, Chatham, Guilford, Orange, Randolph | 49 min |
| Sep 28, 6:52 PM EDT | Severe Thunderstorm Warning | AKQ | Southampton | 53 min |
| Sep 28, 7:01 PM EDT | Severe Thunderstorm Warning | RAH | Franklin, Granville, Nash, Wake | 44 min |
| Sep 28, 7:05 PM EDT | Severe Thunderstorm Warning | RAH | Chatham, Wake | 40 min |
| Sep 28, 7:49 PM EDT | Severe Thunderstorm Warning | RAH | Edgecombe, Halifax, Nash | 41 min |
| Sep 28, 8:18 PM EDT | Severe Thunderstorm Warning | RAH | Edgecombe, Wilson | 32 min |
| Sep 28, 8:21 PM EDT | Severe Thunderstorm Warning | AKQ | Bertie, Chowan, Gates, Hertford, Perquimans | 39 min |
| Sep 28, 8:27 PM EDT | Severe Thunderstorm Warning | RAH | Edgecombe, Halifax | 18 min |
| Sep 28, 8:40 PM EDT | Severe Thunderstorm Warning | AKQ | Camden, Chowan, Currituck, Gates, Pasquotank, Perquimans | 50 min |
| Sep 28, 8:45 PM EDT | Severe Thunderstorm Warning | AKQ | Bertie, Chowan, Perquimans | 45 min |
| Sep 28, 9:16 PM EDT | Severe Thunderstorm Warning | AKQ | Camden, Chowan, Currituck, Pasquotank, Perquimans | 59 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, 9.8 hours before the alert went out and 195 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1519 m above ground
- 0-6 km bulk shear
- 0 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 0 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 28, 4:44 PM EDT | Mesoscale Discussion | SPC | Alamance, Anson, Cabarrus, Caswell, Chatham, Davidson and 26 more | 61 min |
Nearby
Severe Thunderstorm Watches in North Carolina, 2009Severe Thunderstorm Watches in Virginia, 2009Every severe thunderstorm watch 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.