Alert archive / North Carolina / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 301, NWS Raleigh, NC
NWS Raleigh, NC issued this severe thunderstorm warning at Aug 17, 2009, 2:48 PM EDT for Durham County, Orange County, Person County, North Carolina. It was in force for 42 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
- Aug 17, 2009, 2:48 PM EDT (18:48 UTC)
- Expired
- Aug 17, 2009, 3:30 PM EDT
- In force
- 42 min
- Issued by
- NWS Raleigh, NC
- Area
- Storm-based polygon
Counties Durham County, NC, Orange County, NC, Person County, NC
The radar
The Raleigh/Durham radar (KRAX), 71 km from the middle of the area, began a volume at 19:05 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, 6.8 hours before the alert went out and 82 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
- 1792 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 661 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 22 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 Aug 17, 11:13 AM EDT, 3 hours 35 minutes earlier.
Area forecast discussion, Aug 17, 11:13 AM EDT, 3 hours 35 minutes before
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</html>Hazardous weather outlook, Aug 17, 4:13 AM EDT, 10 hours 35 minutes before
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</html>In the hours before
Special weather statement, Aug 17, 2:14 PM EDT, 34 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RALEIGH NC 214 PM EDT MON AUG 17 2009 NCZ008-024>026-041-171945- DURHAM-FRANKLIN-GRANVILLE-ORANGE-WAKE- 214 PM EDT MON AUG 17 2009 ...ISOLATED THUNDERSTORMS DEVELOPING ACROSS THE TRIANGLE... AT 210 PM EDT...DOPPLER RADAR SHOWED DEVELOPING THUNDERSTORMS WITH VERY HEAVY RAIN ACROSS EASTERN ORANGE...CENTRAL DURHAM AND NORTHERN WAKE COUNTIES. THESE SHOWERS AND THUNDERSTORMS WERE MOVING EAST AT 20 MPH. THE STRONGEST THUNDERSTORM WITH VERY HEAVY RAIN ALONG WITH SMALL HAIL AND GUSTY WINDS WILL MOVE NEAR BETHESDA...GORMAN...FALLS LAKE...PURNELL...WAKE FOREST THROUGH 315 PM. BLAES
Special weather statement, Aug 17, 2:36 PM EDT, 12 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RALEIGH NC 236 PM EDT MON AUG 17 2009 NCZ075-171930- MOORE- 236 PM EDT MON AUG 17 2009 ...A STRONG THUNDERSTORM WILL MOVE ACROSS MOORE COUNTY THROUGH 330 PM EDT... AT 235 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER TAYLORTOWN...OR ABOUT 8 MILES SOUTHWEST OF CARTHAGE...MOVING SLOWLY EAST AT 5 MPH. SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...TAYLORTOWN... PINEHURST...WHISPERING PINES. GUSTY WINDS OF 30 TO 40 MPH...SMALL HAIL AND DANGEROUS CLOUD-TO-GROUND LIGHTNING CAN BE EXPECTED WITH THESE THUNDERSTORMS. IN ADDITION...VERY HEAVY RAIN WITH RAINFALL RATES EXCEEDING EXCEEDING ONE INCH DURING THE NEXT HOUR CAN BE EXPECTED IN THESE AREAS. MOTORISTS SHOULD DRIVE WITH CAUTION TO AVOID HYDROPLANING. SMITH
The office that day
Everything else NWS Raleigh, NC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 3:07 PM EDT | Areal Flood Advisory | RAH | Moore | 100 min |
| Aug 17, 3:15 PM EDT | Severe Thunderstorm Warning | RAH | Hoke, Scotland | 60 min |
| Aug 17, 3:25 PM EDT | Severe Thunderstorm Warning | RAH | Chatham, Lee | 51 min |
| Aug 17, 3:53 PM EDT | Areal Flood Advisory | RAH | Wake | 86 min |
| Aug 17, 4:14 PM EDT | Areal Flood Advisory | RAH | Orange | 39 min |
| Aug 17, 4:28 PM EDT | Severe Thunderstorm Warning | RAH | Richmond, Scotland | 39 min |
| Aug 17, 4:36 PM EDT | Severe Thunderstorm Warning | RAH | Johnston, Wake | 39 min |
| Aug 17, 4:45 PM EDT | Areal Flood Advisory | RAH | Wake | 61 min |
| Aug 17, 4:49 PM EDT | Areal Flood Advisory | RAH | Richmond, Scotland | 43 min |
| Aug 17, 4:52 PM EDT | Severe Thunderstorm Warning | RAH | Granville, Vance | 38 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.