Alert archive / North Carolina / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 285, NWS Greenville-Spartanburg, SC
NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Jul 20, 2009, 6:25 PM EDT for Avery County, North Carolina. It was in force for 36 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
- Jul 20, 2009, 6:25 PM EDT (22:25 UTC)
- Expired
- Jul 20, 2009, 7:01 PM EDT
- In force
- 36 min
- Issued by
- NWS Greenville-Spartanburg, SC
- Area
- Storm-based polygon
County Avery County, NC
The radar
The Knoxville radar (KMRX), 133 km from the middle of the area, began a volume at 22:28 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, 10.4 hours before the alert went out and 182 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
- 632 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 660 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
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 Greenville-Spartanburg, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 20, 2:33 PM EDT, 3 hours 52 minutes earlier.
Area forecast discussion, Jul 20, 2:33 PM EDT, 3 hours 52 minutes before
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HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC 350 PM EDT MON JUL 20 2009 GAZ010-017-018-026-028-029-NCZ048-051>053-058-059-062>065-082-507- 509-510-SCZ001>014-019-212000- RABUN-HABERSHAM-STEPHENS-FRANKLIN-HART-ELBERT-MADISON-SWAIN-HAYWOOD- BUNCOMBE-GRAHAM-NORTHERN JACKSON-MACON-SOUTHERN JACKSON-TRANSYLVANIA- HENDERSON-UNION NC-RUTHERFORD MOUNTAINS-POLK MOUNTAINS-EASTERN POLK- OCONEE MOUNTAINS-PICKENS MOUNTAINS-GREENVILLE MOUNTAINS- GREATER OCONEE-GREATER PICKENS-GREATER GREENVILLE-SPARTANBURG- CHEROKEE-YORK-ANDERSON-ABBEVILLE-LAURENS-UNION SC-CHESTER-GREENWOOD- 350 PM EDT MON JUL 20 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST GEORGIA...PIEDMONT NORTH CAROLINA...WESTERN NORTH CAROLINA AND UPSTATE SOUTH CAROLINA. .DAY ONE...THIS AFTERNOON AND TONIGHT. ISOLATED SHOWERS AND THUNDERSTORMS ARE POSSIBLE INTO THIS EVENING. CLOUD TO GROUND LIGHTNING WILL BE THE MAIN THREAT THAT ACCOMPANIES ANY STORMS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... NONE. NCZ033-035>037-049-050-056-057-068>072-501>506-508-212000- AVERY-ALEXANDER-IREDELL-DAVIE-YANCEY-MITCHELL-CATAWBA-ROWAN- CLEVELAND-LINCOLN-GASTON-MECKLENBURG-CABARRUS-CALDWELL MOUNTAINS- GREATER CALDWELL-BURKE MOUNTAINS-GREATER BURKE-MCDOWELL MOUNTAINS- EASTERN MCDOWELL-GREATER RUTHERFORD- 350 PM EDT MON JUL 20 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PIEDMONT NORTH CAROLINA AND WESTERN NORTH CAROLINA. .DAY ONE...THIS AFTERNOON AND TONIGHT. SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO CONTINUE INTO THIS EVENING. A FEW THUNDERSTORMS COULD BECOME SEVERE... PRODUCING HAIL UP TO THE SIZE OF PENNIES. MORE COMMON WILL BE STORMS CAPABLE OF PRODUCING PEA SIZE HAIL...ALONG WITH FREQUENT CLOUD TO GROUND LIGHTNING AND BRIEF...HEAVY RAIN. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... NONE.
In the hours before
Special weather statement, Jul 20, 4:39 PM EDT, 1 hour 46 minutes before
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</html>Local storm report, Jul 20, 5:09 PM EDT, 1 hour 16 minutes before
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</html>Local storm report, Jul 20, 5:23 PM EDT, 1 hour 2 minutes before
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</html>Local storm report, Jul 20, 5:34 PM EDT, 51 minutes before
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</html>Local storm report, Jul 20, 5:43 PM EDT, 42 minutes before
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</html>Local storm report, Jul 20, 6:22 PM EDT, 3 minutes before
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</html>The office that day
Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 5:08 PM EDT | Severe Thunderstorm Warning | GSP | Buncombe, Madison | 52 min |
| Jul 20, 5:19 PM EDT | Severe Thunderstorm Warning | GSP | Burke | 41 min |
| Jul 20, 5:30 PM EDT | Severe Thunderstorm Warning | GSP | Mitchell, Yancey | 60 min |
| Jul 20, 5:48 PM EDT | Severe Thunderstorm Warning | GSP | Burke, Caldwell | 57 min |
| Jul 20, 5:52 PM EDT | Severe Thunderstorm Warning | GSP | Rowan | 53 min |
| Jul 20, 5:56 PM EDT | Severe Thunderstorm Warning | GSP | Buncombe, Madison | 45 min |
| Jul 20, 6:44 PM EDT | Severe Thunderstorm Warning | GSP | Union | 23 min |
| Jul 20, 6:54 PM EDT | Severe Thunderstorm Warning | GSP | Burke, Catawba, Lincoln | 43 min |
| Jul 20, 7:21 PM EDT | Severe Thunderstorm Warning | GSP | Caldwell | 17 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.