Alert archive / South Carolina / Special Weather Statements in 2018

Special Weather Statement, NWS Charleston, SC

December 20, 2018Charleston County, South Carolina

NWS Charleston, SC issued this special weather statement at Dec 20, 2018, 3:03 PM EST for Charleston County, South Carolina. It was in force for 42 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: Dec 20, 2018, 3:03 PM EST (20:03 UTC)
Expired: Dec 20, 2018, 3:45 PM EST
In force: 42 min
Issued by: NWS Charleston, SC

County Charleston County, SC

The radar

The Charleston,SC radar (KCLX), 83 km from the middle of the area, began a volume at 20:02 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.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 8.1 hours before the alert went out and 293 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: 32 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 532 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 265 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 Charleston, SC wrote its last area forecast discussion before this special weather statement went out at Dec 20, 1:12 PM EST, 1 hour 51 minutes earlier.

Area forecast discussion, Dec 20, 1:12 PM EST, 1 hour 51 minutes before

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Hazardous weather outlook, Dec 20, 9:03 AM EST, 6 hours before

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In the hours before

Special weather statement, Dec 20, 12:18 PM EST, 2 hours 45 minutes before

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Special weather statement, Dec 20, 12:46 PM EST, 2 hours 17 minutes before

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Special weather statement, Dec 20, 1:16 PM EST, 1 hour 47 minutes before

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Special weather statement, Dec 20, 1:45 PM EST, 1 hour 18 minutes before

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Special weather statement, Dec 20, 2:36 PM EST, 27 minutes before

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Special weather statement, Dec 20, 3:03 PM EST, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 19, 9:35 PM EST	Flash Flood Watch	CHS	Berkeley, Colleton, Dorchester	19 hr
Dec 20, 3:22 AM EST	Gale Warning	CHS		48 hr
Dec 20, 6:35 AM EST	Areal Flood Advisory	CHS	Charleston	55 min
Dec 20, 8:51 AM EST	High Surf Advisory	CHS		30 hr
Dec 20, 12:14 PM EST	Special Marine Warning	CHS		61 min
Dec 20, 12:46 PM EST	Special Weather Statement	CHS	Beaufort, Jasper	29 min
Dec 20, 12:49 PM EST	Special Marine Warning	CHS		56 min
Dec 20, 1:16 PM EST	Special Weather Statement	CHS	Beaufort, Jasper	29 min
Dec 20, 1:45 PM EST	Special Weather Statement	CHS	Beaufort, Jasper	45 min
Dec 20, 2:28 PM EST	Special Marine Warning	CHS		62 min
Dec 20, 2:36 PM EST	Special Weather Statement	CHS	Colleton	24 min
Dec 20, 3:10 PM EST	Special Marine Warning	CHS		73 min
Dec 20, 3:24 PM EST	Lake Wind Advisory	CHS	Berkeley	18 hr
Dec 20, 3:24 PM EST	Wind Advisory	CHS	Allendale, Berkeley, Colleton, Dorchester, Hampton	27 hr
Dec 20, 3:36 PM EST	Special Weather Statement	CHS	Berkeley	24 min
Dec 20, 4:33 PM EST	Special Marine Warning	CHS		21 min
Dec 20, 12:18 PM EST	Special Weather Statement	CHS	Bryan, Chatham, Liberty, Long, McIntosh	27 min

Nearby

Special Weather Statements in South Carolina, 2018 Every special weather statement in 2018

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.