Alert archive / North Carolina / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 22, NWS Raleigh, NC
NWS Raleigh, NC issued this severe thunderstorm warning at Apr 20, 2009, 2:31 PM EDT for Alamance County, Guilford County, Randolph County, North Carolina. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 20, 2009, 2:31 PM EDT (18:31 UTC)
- Expired
- Apr 20, 2009, 3:15 PM EDT
- In force
- 44 min
- Issued by
- NWS Raleigh, NC
- Area
- Storm-based polygon
Counties Alamance County, NC, Guilford County, NC, Randolph County, NC
The radar
The Raleigh/Durham radar (KRAX), 110 km from the middle of the area, began a volume at 18:32 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, 6.5 hours before the alert went out and 26 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 602 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 133 m²/s²
- 0-3 km storm-relative helicity
- 179 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Raleigh, NC wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 20, 11:45 AM EDT, 2 hours 46 minutes earlier.
Area forecast discussion, Apr 20, 11:45 AM EDT, 2 hours 46 minutes before
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</html>Hazardous weather outlook, Apr 20, 4:18 AM EDT, 10 hours 13 minutes before
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Special weather statement, Apr 20, 2:07 PM EDT, 24 minutes before
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</html>The office that day
Everything else NWS Raleigh, NC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 3:35 PM EDT | Severe Thunderstorm Warning | RAH | Alamance, Durham, Orange, Person | 40 min |
| Apr 20, 3:57 PM EDT | Severe Thunderstorm Warning | RAH | Halifax, Warren | 17 min |
| Apr 20, 4:17 PM EDT | Severe Thunderstorm Warning | RAH | Durham, Granville, Person, Vance | 58 min |
| Apr 20, 4:48 PM EDT | Severe Thunderstorm Warning | RAH | Granville, Halifax, Vance, Warren | 62 min |
| Apr 20, 5:12 PM EDT | Severe Thunderstorm Warning | RAH | Sampson | 19 min |
| Apr 20, 5:42 PM EDT | Severe Thunderstorm Warning | RAH | Johnston, Wayne | 36 min |
| Apr 20, 6:41 PM EDT | Severe Thunderstorm Warning | RAH | Edgecombe, Wilson | 49 min |
| Apr 20, 6:59 PM EDT | Severe Thunderstorm Warning | RAH | Warren | 31 min |
Nearby
Severe Thunderstorm Warnings in North Carolina, 2009Every severe thunderstorm warning 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.