Alert archive / South Carolina / Severe Thunderstorm Watches in 2009
Severe Thunderstorm Watch 421
The Storm Prediction Center issued this severe thunderstorm watch at Jun 15, 2009, 3:21 PM EDT for 17 counties in North Carolina; 23 counties in South Carolina. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 15, 2009, 3:21 PM EDT (19:21 UTC)
- Expired
- Jun 15, 2009, 11:00 PM EDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 40 counties
Anson County, NC, Bladen County, NC, Chatham County, NC, Columbus County, NC, Cumberland County, NC, Harnett County, NC, Hoke County, NC, Johnston County, NC, Lee County, NC, Moore County, NC, Richmond County, NC, Robeson County, NC, Sampson County, NC, Scotland County, NC, Wake County, NC, Wayne County, NC, Wilson County, NC, Berkeley County, SC, Calhoun County, SC, Charleston County, SC, Chesterfield County, SC, Clarendon County, SC, Colleton County, SC, Darlington County, SC, Dillon County, SC, Dorchester County, SC, Fairfield County, SC, Florence County, SC, Georgetown County, SC, Horry County, SC, Kershaw County, SC, Lancaster County, SC, Lee County, SC, Lexington County, SC, Marion County, SC, Marlboro County, SC, Orangeburg County, SC, Richland County, SC, Sumter County, SC, Williamsburg County, SC
The radar
The Wilmington radar (KLTX), 118 km from the middle of the area, began a volume at 19:24 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
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 15, 5:05 PM EDT | Severe Thunderstorm Warning | RAH | Cumberland, Harnett, Sampson | 55 min |
| Jun 15, 5:44 PM EDT | Severe Thunderstorm Warning | RAH | Chatham, Randolph | 46 min |
| Jun 15, 6:30 PM EDT | Severe Thunderstorm Warning | ILM | Bladen, Columbus, Robeson | 60 min |
| Jun 15, 7:04 PM EDT | Severe Thunderstorm Warning | CAE | Fairfield, Kershaw, Richland | 41 min |
| Jun 15, 7:06 PM EDT | Severe Thunderstorm Warning | ILM | Robeson | 30 min |
| Jun 15, 7:21 PM EDT | Tornado Warning | ILM | Bladen, Columbus | 39 min |
| Jun 15, 7:28 PM EDT | Severe Thunderstorm Warning | ILM | Columbus, Robeson | 62 min |
| Jun 15, 8:06 PM EDT | Severe Thunderstorm Warning | ILM | Brunswick, Columbus | 39 min |
| Jun 15, 8:16 PM EDT | Severe Thunderstorm Warning | ILM | Robeson | 44 min |
| Jun 15, 9:52 PM EDT | Severe Thunderstorm Warning | ILM | Horry | 25 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, 7.4 hours before the alert went out and 185 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
- 276 J/kg
- Mixed-layer CIN
- -45 J/kg
- Mixed-layer LCL
- 940 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 69 m²/s²
- 0-3 km storm-relative helicity
- 83 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 15, 1:26 PM EDT | Mesoscale Discussion | SPC | Anson, Bladen, Buncombe, Burke, Cabarrus, Catawba and 37 more | 64 min |
| Jun 15, 6:42 PM EDT | Mesoscale Discussion | SPC | Bladen, Brunswick, Columbus, Cumberland, Duplin, Hoke and 7 more | 63 min |
Nearby
Severe Thunderstorm Watches in South Carolina, 2009Severe Thunderstorm Watches in North Carolina, 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.