Alert archive / South Carolina / Freeze Watches in 2018

Freeze Watch 2, NWS Charleston, SC

March 22, 20185 counties in South Carolina; Screven County, Georgia

NWS Charleston, SC issued this freeze watch at Mar 22, 2018, 9:50 AM EDT for 5 counties in South Carolina; Screven County, Georgia. It took effect at Mar 23, 2018, 5:00 AM EDT. It was in force for .

The area

The counties it named.

The facts

Issued: Mar 22, 2018, 9:50 AM EDT (13:50 UTC)
In effect from: Mar 23, 2018, 5:00 AM EDT
Expired: Mar 22, 2018, 2:56 PM EDT
In force
Issued by: NWS Charleston, SC

Counties Screven County, GA, Allendale County, SC, Berkeley County, SC, Colleton County, SC, Dorchester County, SC, Hampton County, SC

The radar

The Charleston,SC radar (KCLX), 36 km from the middle of the area, began a volume at 13:51 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, 1.8 hours before the alert went out and 80 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1277 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freeze watch 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 freeze watch went out at Mar 22, 7:37 AM EDT, 2 hours 13 minutes earlier.

Area forecast discussion, Mar 22, 7:37 AM EDT, 2 hours 13 minutes before

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Hazardous weather outlook, Mar 22, 3:59 AM EDT, 5 hours 51 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
Mar 22, 12:13 AM EDT	Small Craft Advisory	CHS		10 hr
Mar 22, 2:56 PM EDT	Frost Advisory	CHS	Allendale, Hampton	18 hr
Mar 22, 2:56 PM EDT	Freeze Warning	CHS	Allendale, Berkeley, Colleton, Dorchester, Hampton	18 hr

Nearby

Freeze Watches in South Carolina, 2018 Freeze Watches in Georgia, 2018 Every freeze watch 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.