Alert archive / South Carolina / Tornado Warnings in 2020
Tornado Warning 20, NWS Columbia, SC
NWS Columbia, SC issued this tornado warning at Sep 17, 2020, 10:00 AM EDT for Calhoun County, Clarendon County, Orangeburg County, South Carolina. It was in force for 45 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 17, 2020, 10:00 AM EDT (14:00 UTC)
- Expired
- Sep 17, 2020, 10:45 AM EDT
- In force
- 45 min
- Issued by
- NWS Columbia, SC
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.0 in
Counties Calhoun County, SC, Clarendon County, SC, Orangeburg County, SC
The radar
The Columbia radar (KCAE), 75 km from the middle of the area, began a volume at 14:02 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 17, 10:17 AM EDT | TORNADO | 4 Ne Santee, SC | A NATIONAL WEATHER SERVICE STORM SURVEY TEAM CONFIRMED AN EF-0 TORNADO, WITH PEAK WIND SPEEDS OF 85 MPH, NORTHEAST OF SANTEE IN CLARENDON COUNTY, SC. THE TORNADO BEGAN ALONG THE EDGE OF LAKE MARION, JUST WEST OF I-95, NEAR THE ADAMS LANDING COMMUNITY. THE TORN |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Charleston AFB, SC (KCHS), launched 12:00Z, 2.0 hours before the alert went out and 90 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
- 1154 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 652 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 188 m²/s²
- 0-3 km storm-relative helicity
- 261 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 5.7
The text
As transmitted.
521
WFUS52 KCAE 171400
TORCAE
SCC017-027-075-171445-
/O.NEW.KCAE.TO.W.0020.200917T1400Z-200917T1445Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Columbia SC
1000 AM EDT Thu Sep 17 2020
The National Weather Service in Columbia has issued a
* Tornado Warning for...
Southeastern Calhoun County in central South Carolina...
Southwestern Clarendon County in central South Carolina...
East central Orangeburg County in central South Carolina...
* Until 1045 AM EDT.
* At 959 AM EDT, a severe thunderstorm capable of producing a tornado
was located 7 miles south of Santee State Park, or 15 miles north
of Indian Field, moving north at 25 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Santee State Park around 1015 AM EDT.
Summerton around 1035 AM EDT.
Other locations impacted by this tornadic thunderstorm include
Santee, Davis Station, Mill Creek Marina and Campground, Vance and
St. Paul.
This includes Interstate 95 between mile markers 94 and 116.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! If you are outdoors, in a mobile home, or in a
vehicle, move to an interior room or closet on the lowest floor of a
sturdy building immediately.
Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. Immediately move to an interior room on the lowest floor of
a sturdy building.
&&
LAT...LON 3365 8019 3339 8041 3343 8053 3371 8047
3371 8045 3372 8045 3372 8043 3371 8043
3371 8041
TIME...MOT...LOC 1359Z 198DEG 20KT 3344 8046
TORNADO...RADAR INDICATED
HAIL...0.00IN
$$
JAQ1 follow-up statement
035
WWUS52 KCAE 171426
SVSCAE
Severe Weather Statement
National Weather Service Columbia SC
1026 AM EDT Thu Sep 17 2020
SCC017-075-171435-
/O.CAN.KCAE.TO.W.0020.000000T0000Z-200917T1445Z/
Calhoun SC-Orangeburg SC-
1026 AM EDT Thu Sep 17 2020
...THE TORNADO WARNING FOR SOUTHEASTERN CALHOUN AND EAST CENTRAL
ORANGEBURG COUNTIES IS CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 600 PM EDT for central South
Carolina.
LAT...LON 3367 8025 3353 8039 3356 8048 3371 8047
3371 8045 3372 8045 3372 8043 3371 8043
3371 8041
TIME...MOT...LOC 1425Z 198DEG 20KT 3358 8040
$$
SCC027-171445-
/O.CON.KCAE.TO.W.0020.000000T0000Z-200917T1445Z/
Clarendon SC-
1026 AM EDT Thu Sep 17 2020
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1045 AM EDT FOR
SOUTHWESTERN CLARENDON COUNTY...
At 1025 AM EDT, a severe thunderstorm capable of producing a tornado
was located near Summerton, or 13 miles southwest of Manning, moving
north at 25 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Summerton around 1035 AM EDT.
Other locations impacted by this tornadic thunderstorm include St.
Paul.
This includes Interstate 95 between mile markers 104 and 116.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! If you are outdoors, in a mobile home, or in a
vehicle, move to an interior room or closet on the lowest floor of a
sturdy building immediately.
Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. Immediately move to an interior room on the lowest floor of
a sturdy building.
&&
LAT...LON 3367 8025 3353 8039 3356 8048 3371 8047
3371 8045 3372 8045 3372 8043 3371 8043
3371 8041
TIME...MOT...LOC 1425Z 198DEG 20KT 3358 8040
TORNADO...RADAR INDICATED
HAIL...0.00IN
$$
JAQThe office that day
Everything else NWS Columbia, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 16, 11:22 PM EDT | River Flood Advisory | CAE | Lexington, Richland | 46 hr |
| Sep 17, 7:56 AM EDT | Tornado Warning | CAE | Richland, Sumter | 34 min |
| Sep 17, 8:09 AM EDT | Tornado Warning | CAE | Calhoun, Richland, Sumter | 21 min |
| Sep 17, 8:30 AM EDT | Flash Flood Warning | CAE | Aiken, Edgefield, McCormick | 3 hr |
| Sep 17, 9:22 AM EDT | Flash Flood Warning | CAE | Aiken, Barnwell, Edgefield, McCormick, Newberry, Saluda | 3 hr |
| Sep 17, 9:33 AM EDT | Tornado Warning | CAE | Calhoun, Orangeburg | 27 min |
| Sep 17, 9:46 AM EDT | River Flood Warning | CAE | Calhoun, Lexington, Richland | 35 hr |
| Sep 17, 9:46 AM EDT | River Flood Warning | CAE | Calhoun, Richland | 3 days |
| Sep 17, 9:46 AM EDT | River Flood Warning | CAE | Edgefield, McCormick | 12 hr |
| Sep 17, 10:28 AM EDT | Flash Flood Warning | CAE | Bamberg, Calhoun, Clarendon, Orangeburg, Richland, Sumter | 3 hr |
| Sep 17, 10:38 AM EDT | Flash Flood Warning | CAE | Aiken, Bamberg, Barnwell, Calhoun, Fairfield, Kershaw and 6 more | 3 hr |
| Sep 17, 10:44 AM EDT | Tornado Warning | CAE | Clarendon, Sumter | 46 min |
| Sep 17, 11:01 AM EDT | Tornado Warning | CAE | Clarendon, Sumter | 29 min |
| Sep 17, 11:27 AM EDT | Tornado Warning | CAE | Lee, Sumter | 48 min |
| Sep 17, 11:44 AM EDT | Tornado Warning | CAE | Calhoun, Clarendon, Orangeburg, Sumter | 46 min |
| Sep 17, 12:06 PM EDT | Flash Flood Warning | CAE | Clarendon, Kershaw, Lee, Richland, Sumter | 3 hr |
| Sep 17, 12:39 PM EDT | Tornado Warning | CAE | Clarendon, Sumter | 33 min |
| Sep 17, 12:56 PM EDT | Tornado Warning | CAE | Calhoun, Clarendon, Orangeburg | 36 min |
| Sep 17, 1:11 PM EDT | Tornado Warning | CAE | Sumter | 49 min |
| Sep 17, 1:34 PM EDT | Flash Flood Warning | CAE | Calhoun, Clarendon, Orangeburg, Richland, Sumter | 3 hr |
| Sep 17, 2:37 PM EDT | Severe Thunderstorm Warning | CAE | Lee, Sumter | 23 min |
| Sep 17, 2:52 PM EDT | Severe Thunderstorm Warning | CAE | Clarendon | 40 min |
| Sep 17, 3:02 PM EDT | Tornado Warning | CAE | Clarendon, Sumter | 28 min |
| Sep 17, 3:19 PM EDT | Flash Flood Warning | CAE | Clarendon, Lee, Sumter | 3 hr |
| Sep 17, 5:45 PM EDT | Areal Flood Advisory | CAE | Clarendon, Orangeburg, Sumter | 60 min |
| Sep 17, 6:08 PM EDT | Special Weather Statement | CAE | Clarendon | 22 min |
Nearby
Tornado Warnings in South Carolina, 2020Every tornado warning in 2020Tornadoes in 2020
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.