Alert archive / North Carolina / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 309, NWS Raleigh, NC
NWS Raleigh, NC issued this severe thunderstorm warning at Aug 20, 2009, 3:10 PM EDT for Granville County, North Carolina. It was in force for 43 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 20, 2009, 3:10 PM EDT (19:10 UTC)
- Expired
- Aug 20, 2009, 3:53 PM EDT
- In force
- 43 min
- Issued by
- NWS Raleigh, NC
- Area
- Storm-based polygon
County Granville County, NC
The radar
The Raleigh/Durham radar (KRAX), 73 km from the middle of the area, began a volume at 19:12 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, 7.2 hours before the alert went out and 115 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
- 1782 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 576 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 93 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
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 20, 2:59 PM EDT, 11 minutes earlier.
Area forecast discussion, Aug 20, 2:59 PM EDT, 11 minutes before
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</html>Hazardous weather outlook, Aug 20, 11:58 AM EDT, 3 hours 12 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RALEIGH NC 1158 AM EDT THU AUG 20 2009 NCZ009>011-026>028-041>043-077-078-085-086-088-089-211000- VANCE-WARREN-HALIFAX-FRANKLIN-NASH-EDGECOMBE-WAKE-JOHNSTON-WILSON- HARNETT-WAYNE-SCOTLAND-HOKE-CUMBERLAND-SAMPSON- 1158 AM EDT THU AUG 20 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NORTH CAROLINA. .DAY ONE...TODAY AND TONIGHT. SCATTERED THUNDERSTORMS WILL DEVELOP THIS AFTERNOON WITH THE POTENTIAL THAT A FEW MAY BECOME SEVERE. THE PRIMARY THREAT WILL BE DAMAGING DOWNBURST WINDS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. THE APPROACH OF AN UNSEASONABLY STRONG UPPER LEVEL TROUGH AND PASSAGE OF AN ASSOCIATED COLD FRONT WILL PROMOTE THE DEVELOPMENT OF SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS SATURDAY AFTERNOON. A FEW THUNDERSTORMS COULD BECOME SEVERE... MAINLY BETWEEN NOON AND 8 PM... WITH A PRIMARY THREAT OF DAMAGING WIND GUSTS. THE POTENTIAL FOR THUNDERSTORMS TO TRAIN OVER THE SAME AREAS MAY ALSO RESULT IN LOCALIZED URBAN FLOODING. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTERS ARE ENCOURAGED TO REPORT ANY SEVERE OR SIGNIFICANT WEATHER ASSOCIATED WITH THESE STORMS. NCZ007-008-021>025-038>040-073>076-083-084-211000- PERSON-GRANVILLE-FORSYTH-GUILFORD-ALAMANCE-ORANGE-DURHAM-DAVIDSON- RANDOLPH-CHATHAM-STANLY-MONTGOMERY-MOORE-LEE-ANSON-RICHMOND- 543 AM EDT THU AUG 20 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NORTH CAROLINA. .DAY ONE...TODAY AND TONIGHT. HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. THE APPROACH OF AN UNSEASONABLY STRONG UPPER LEVEL TROUGH AND PASSAGE OF AN ASSOCIATED COLD FRONT WILL PROMOTE THE DEVELOPMENT OF SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS FRIDAY AND FRIDAY NIGHT. A FEW THUNDERSTORMS COULD BECOME SEVERE... MAINLY BETWEEN 3 PM AND 11 PM... WITH A PRIMARY THREAT OF DAMAGING WIND GUSTS. THE POTENTIAL FOR THUNDERSTORMS TO TRAIN OVER THE SAME AREAS MAY ALSO RESULT IN LOCALIZED URBAN FLOODING. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTERS ARE ENCOURAGED TO REPORT ANY SEVERE OR SIGNIFICANT WEATHER ASSOCIATED WITH THESE STORMS.
In the hours before
Special weather statement, Aug 20, 1:12 PM EDT, 1 hour 58 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RALEIGH NC 112 PM EDT THU AUG 20 2009 NCZ022-023-201815- ALAMANCE-GUILFORD- 112 PM EDT THU AUG 20 2009 ...A STRONG THUNDERSTORM WILL MOVE ACROSS GUILFORD AND ALAMANCE COUNTIES THROUGH 215 PM EDT... AT 111 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER GREENSBORO...MOVING NORTHEAST AT 30 MPH. SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE MCLEANSVILLE... MONTICELLO... GIBSONVILLE... ELON COLLEGE... ALTAMAHAW... GLEN RAVEN... UNION RIDGE...AND PLEASANT GROVE. GUSTY WINDS OF 30 TO 40 MPH...SMALL HAIL... AND DANGEROUS CLOUD-TO-GROUND LIGHTNING CAN BE EXPECTED WITH THESE THUNDERSTORMS. ANYONE OUTDOORS SHOULD MOVE INSIDE A SAFE BUILDING... AND WAIT UNTIL THE STORM HAS PASSED. GIH
Local storm report, Aug 20, 1:41 PM EDT, 1 hour 29 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RALEIGH NC
141 PM EDT THU AUG 20 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0115 PM TSTM WND DMG 4 WNW MCLEANSVILLE 36.13N 79.72W
08/20/2009 GUILFORD NC PUBLIC
PUBLIC REPORT LARGE TREE LIMBS BLOWN DOWN AND TWO
BRADFORD PEAR TREES TOPPLED ON BRIARMEAD ROAD.
&&
BLAESSpecial weather statement, Aug 20, 2:02 PM EDT, 1 hour 8 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RALEIGH NC 202 PM EDT THU AUG 20 2009 NCZ022>024-039-201900- ALAMANCE-GUILFORD-ORANGE-RANDOLPH- 202 PM EDT THU AUG 20 2009 ...STRONG THUNDERSTORMS WILL MOVE ACROSS GUILFORD AND ALAMANCE COUNTIES THROUGH 300 PM EDT... AT 200 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS OVER CLIMAX...OR ABOUT 10 MILES NORTHEAST OF RANDLEMAN...MOVING NORTHEAST AT 20 MPH. THE STRONG THUNDERSTORMS WILL BE NEAR ALAMANCE...ELON COLLEGE... BURLINGTON...AND...GLEN RAVEN...GRAHAM. GUSTY WINDS OF 30 TO 40 MPH...SMALL HAIL AND DANGEROUS CLOUD-TO-GROUND LIGHTNING CAN BE EXPECTED WITH THESE THUNDERSTORMS. BLAES
Special weather statement, Aug 20, 2:22 PM EDT, 48 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RALEIGH NC 222 PM EDT THU AUG 20 2009 NCZ021-022-038-039-201915- DAVIDSON-FORSYTH-GUILFORD-RANDOLPH- 222 PM EDT THU AUG 20 2009 ...STRONG THUNDERSTORMS WILL MOVE ACROSS LEXINGTON...SOUTHERN FORSYTH AND WESTERN GUILFORD COUNTIES THROUGH 315 PM EDT... AT 220 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS OVER JUST WEST OF LEXINGTON AND WELCOME...MOVING NORTHEAST AT 30 MPH. THE STRONG THUNDERSTORMS WILL BE NEAR WELCOME...THOMASVILLE... TRINITY...ARCHDALE...HIGH POINT...JAMESTOWN. GUSTY WINDS OF 30 TO 40 MPH...SMALL HAIL AND DANGEROUS CLOUD-TO-GROUND LIGHTNING CAN BE EXPECTED WITH THESE THUNDERSTORMS. BLAES
Special weather statement, Aug 20, 2:45 PM EDT, 25 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RALEIGH NC 245 PM EDT THU AUG 20 2009 NCZ007-023>025-201945- ALAMANCE-DURHAM-ORANGE-PERSON- 245 PM EDT THU AUG 20 2009 ...STRONG THUNDERSTORMS WILL MOVE ACROSS PERSON...ORANGE AND DURHAM COUNTIES THROUGH 345 PM EDT... AT 244 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS OVER EFLAND...OR ABOUT 6 MILES NORTHWEST OF HILLSBOROUGH...MOVING NORTHEAST AT 45 MPH. THE STRONGEST THUNDERSTORMS WILL MOVE NEAR SCHLEY...BUSHY FORK...ROUGEMONT...MORIAH...SURL AND DURHAM. GUSTY WINDS OF 30 TO 40 MPH...SMALL HAIL AND DANGEROUS CLOUD-TO-GROUND LIGHTNING CAN BE EXPECTED WITH THESE THUNDERSTORMS. BLAES
Local storm report, Aug 20, 2:57 PM EDT, 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RALEIGH NC
257 PM EDT THU AUG 20 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0229 PM TSTM WND DMG 1 W LEXINGTON 35.81N 80.28W
08/20/2009 DAVIDSON NC LAW ENFORCEMENT
ONE TREE WAS BLOWN DOWN ONTO A HOME ON SINK CIRLE INSIDE
THE LEXINGTON CITY LIMITS.
&&
BLOCKLEAThe office that day
Everything else NWS Raleigh, NC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 2:32 PM EDT | Severe Thunderstorm Warning | RAH | Davidson, Forsyth, Guilford, Randolph | 38 min |
| Aug 20, 3:42 PM EDT | Severe Thunderstorm Warning | RAH | Lee | 33 min |
| Aug 20, 3:57 PM EDT | Areal Flood Advisory | RAH | Anson, Richmond | 112 min |
| Aug 20, 4:16 PM EDT | Areal Flood Advisory | RAH | Montgomery, Randolph | 92 min |
| Aug 20, 4:48 PM EDT | Severe Thunderstorm Warning | RAH | Anson, Montgomery, Stanly | 42 min |
| Aug 20, 5:16 PM EDT | Areal Flood Advisory | RAH | Stanly | 113 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.