Alert archive / South Carolina / Special Weather Statements in 2017

Special Weather Statement, NWS Columbia, SC

July 16, 2017Sumter County, South Carolina

NWS Columbia, SC issued this special weather statement at Jul 16, 2017, 2:18 PM EDT for Sumter County, South Carolina. It was in force for 27 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 16, 2017, 2:18 PM EDT (18:18 UTC)
Expired: Jul 16, 2017, 2:45 PM EDT
In force: 27 min
Issued by: NWS Columbia, SC

County Sumter County, SC

The radar

The Columbia radar (KCAE), 74 km from the middle of the area, began a volume at 18:19 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

Charleston AFB, SC (KCHS), launched 12:00Z, 6.3 hours before the alert went out and 106 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 852 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 977 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Columbia, SC wrote its last area forecast discussion before this special weather statement went out at Jul 16, 2:04 PM EDT, 14 minutes earlier.

Area forecast discussion, Jul 16, 2:04 PM EDT, 14 minutes before

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Hazardous weather outlook, Jul 16, 3:16 AM EDT, 11 hours 2 minutes before

Hazardous Weather Outlook
National Weather Service Columbia SC
316 AM EDT Sun Jul 16 2017

GAZ040-063>065-077-SCZ015-016-018-020>022-025>031-035>038-041-170730-
Lincoln-McDuffie-Columbia-Richmond-Burke-Lancaster-Chesterfield-
McCormick-Newberry-Fairfield-Kershaw-Edgefield-Saluda-Lexington-
Richland-Lee-Aiken-Sumter-Barnwell-Orangeburg-Calhoun-Clarendon-
Bamberg-
316 AM EDT Sun Jul 16 2017

This Hazardous Weather Outlook is for the Midlands of South Carolina
and the Central Savannah River area of Georgia.

.DAY ONE...Today and Tonight.

Thunderstorms through Tonight could possibly contain strong to
damaging winds, along with heavy rain with localized flooding.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Monday, A few thunderstorms with damaging wind will be possible
along a decaying surface front. The storms may also contain heavy
rain with localized flooding.

Friday and Saturday, heat index values may climb back above 105
degrees in many areas.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Jul 16, 2:18 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Columbia SC
218 PM EDT SUN JUL 16 2017

SCZ031-161845-
Sumter-
218 PM EDT SUN JUL 16 2017

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL SUMTER COUNTIES...

At 217 PM EDT, a strong thunderstorm was just south of
Sumter, moving northeast at 10 mph.

Wind gusts up to 50 mph are possible with this storm along
with small hail. Ponding of water will occur in poor-drainage
areas. Do not drive on flooded roads.

Locations impacted include...
South Sumter.

LAT...LON 3381 8025 3378 8028 3377 8040 3375 8040
      3375 8042 3384 8048 3396 8031 3383 8021
TIME...MOT...LOC 1817Z 236DEG 9KT 3386 8038

The office that day

Everything else NWS Columbia, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 15, 8:00 PM EDT	Severe Thunderstorm Warning	CAE	Bamberg	45 min
Jul 15, 8:34 PM EDT	Flash Flood Warning	CAE	Aiken	3 hr
Jul 16, 3:01 PM EDT	Special Weather Statement	CAE	Clarendon	44 min
Jul 16, 4:37 PM EDT	Areal Flood Advisory	CAE	Lee	113 min
Jul 16, 5:11 PM EDT	Special Weather Statement	CAE	McCormick	49 min
Jul 16, 5:50 PM EDT	Special Weather Statement	CAE	Richland	40 min
Jul 16, 5:53 PM EDT	Areal Flood Advisory	CAE	Lexington, Richland	112 min
Jul 16, 5:53 PM EDT	Severe Thunderstorm Warning	CAE	Kershaw, Richland	40 min
Jul 16, 6:20 PM EDT	Flash Flood Warning	CAE	Kershaw, Richland	115 min
Jul 16, 6:39 PM EDT	Areal Flood Advisory	CAE	Calhoun, Lexington, Orangeburg, Richland, Sumter	2 hr
Jul 16, 6:41 PM EDT	Special Weather Statement	CAE	Calhoun	49 min
Jul 16, 7:14 PM EDT	Special Weather Statement	CAE	Newberry	46 min

Nearby

Special Weather Statements in South Carolina, 2017 Every special weather statement in 2017

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.