Alert archive / South Carolina / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 21, NWS Charleston, SC

April 15, 2007Allendale County, South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Apr 15, 2007, 3:37 AM EDT for Allendale County, South Carolina. It was in force for 38 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: Apr 15, 2007, 3:37 AM EDT (07:37 UTC)
Expired: Apr 15, 2007, 4:15 AM EDT
In force: 38 min
Issued by: NWS Charleston, SC
Area: Counties, with a storm outline in the text

County Allendale County, SC

The radar

The Charleston,SC radar (KCLX), 65 km from the middle of the area, began a volume at 07:37 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 15, 2:01 AM EDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 7.6 hours before the alert went out and 143 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: 329 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 638 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 264 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS52 KCHS 150737
SVRCHS
SCC005-150815-
/O.NEW.KCHS.SV.W.0021.070415T0737Z-070415T0815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
337 AM EDT SUN APR 15 2007

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN ALLENDALE COUNTY IN SOUTHEAST SOUTH CAROLINA...

* UNTIL 415 AM EDT

* AT 337 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN
  EXCESS OF 80 MPH.  THIS STORM WAS LOCATED 8 MILES SOUTHWEST OF
  MILLETT...OR ABOUT 19 MILES NORTH OF SYLVANIA...MOVING NORTHEAST AT
  35 MPH.

* SOME LOCATIONS IN OR NEAR THE PATH OF THE STORM INCLUDE...
  MILLETT...
  MARTIN...

A TORNADO WATCH IS ALSO IN EFFECT. SEVERE THUNDERSTORMS CAN PRODUCE
TORNADOES SUDDENLY. BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS
AND BE READY TO ACT QUICKLY.

TO REPORT SEVERE WEATHER ONLY...PLEASE CONTACT THE NATIONAL WEATHER
SERVICE IN CHARLESTON TOLL FREE AT 1-888-383-2024.

LAT...LON 3309 8161 3301 8151 3310 8130 3315 8153

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 1:45 AM EDT	Tornado Warning	CHS	Berkeley	30 min
Apr 15, 3:44 AM EDT	Tornado Warning	CHS	Allendale	31 min
Apr 15, 4:23 AM EDT	Tornado Warning	CHS	Allendale	27 min
Apr 15, 7:02 AM EDT	Tornado Warning	CHS	Allendale	13 min
Apr 15, 7:39 AM EDT	Tornado Warning	CHS	Allendale	36 min
Apr 15, 9:38 AM EDT	Tornado Warning	CHS	Colleton	39 min
Apr 15, 10:03 AM EDT	Tornado Warning	CHS	Dorchester	27 min
Apr 15, 10:21 AM EDT	Severe Thunderstorm Warning	CHS	Berkeley	39 min
Apr 15, 10:35 AM EDT	Severe Thunderstorm Warning	CHS	Colleton, Dorchester	40 min
Apr 15, 10:59 AM EDT	Severe Thunderstorm Warning	CHS	Berkeley, Charleston	91 min
Apr 15, 11:14 AM EDT	Severe Thunderstorm Warning	CHS	Colleton, Dorchester	37 min
Apr 15, 4:02 PM EDT	Fire Weather Watch	CHS	Allendale, Berkeley, Colleton, Dorchester, Hampton	13 hr

Nearby

Severe Thunderstorm Warnings in South Carolina, 2007 Every severe thunderstorm warning in 2007

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.