Alert archive / South Carolina / Areal Flood Advisories in 2012

Areal Flood Advisory 76, NWS Columbia, SC

September 7, 2012Orangeburg County, South Carolina

NWS Columbia, SC issued this areal flood advisory at Sep 7, 2012, 5:38 AM EDT for Orangeburg County, South Carolina. It was in force for 52 min.

The area

The counties it named.

The facts

Issued: Sep 7, 2012, 5:38 AM EDT (09:38 UTC)
Expired: Sep 7, 2012, 6:30 AM EDT
In force: 52 min
Issued by: NWS Columbia, SC
Area: Storm-based polygon

County Orangeburg County, SC

The radar

The Columbia radar (KCAE), 64 km from the middle of the area, began a volume at 09:39 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 00:00Z, 9.6 hours before the alert went out and 96 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: 1904 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 911 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 67 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 areal flood advisory 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 areal flood advisory went out at Sep 7, 4:45 AM EDT, 53 minutes earlier.

Area forecast discussion, Sep 7, 4:45 AM EDT, 53 minutes before

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Hazardous weather outlook, Sep 7, 5:02 AM EDT, 36 minutes before

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In the hours before

Special weather statement, Sep 7, 1:27 AM EDT, 4 hours 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
127 AM EDT FRI SEP 7 2012

SCZ028-031-038-070630-
CLARENDON-RICHLAND-SUMTER-
127 AM EDT FRI SEP 7 2012

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF RICHLAND...SUMTER AND
CLARENDON COUNTIES THROUGH 230 AM EDT...

AT 125 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
CLUSTER OF THUNDERSTORMS OVER THE EASTERN MIDLANDS...MOVING
SOUTHEAST AT 5 MPH. THESE STORMS WERE PRODUCING RAINFALL RATES UP TO
TWO INCHES PER HOUR. RADAR HAS ESTIMATED BETWEEN 2.00 AND 3.00
INCHES OF RAIN MAY HAVE FALLEN.

SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE...
EASTOVER...MANNING...MILLWOOD...MULBERRY...SOUTH SUMTER...SUMMERTON
AND SUMTER...

PREPARE NOW FOR THE FOLLOWING HAZARDS...
TORRENTIAL RAIN WHICH MAY PRODUCE LOCALIZED FLOODING...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REPORT LARGE HAIL...DAMAGING WINDS OR FLOODING TO YOUR COUNTY
SHERIFF...OR CALL THE NATIONAL WEATHER SERVICE TOLL FREE AT 1...8 7
7...6 3 3...6 7 7 2.

&&

LAT...LON 3377 7999 3372 7997 3350 8009 3348 8014
      3346 8013 3343 8035 3347 8043 3353 8047
      3354 8045 3356 8049 3397 8077 3397 8018
      3396 8017 3397 8014 3397 8000 3396 7995
      3394 7997 3390 7995 3389 7991 3385 7989
TIME...MOT...LOC 0522Z 332DEG 5KT 3386 8043

Special weather statement, Sep 7, 2:51 AM EDT, 2 hours 47 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
251 AM EDT FRI SEP 7 2012

SCZ031-038-070745-
CLARENDON-SUMTER-
250AM EDT FRI SEP 7 2012

...THUNDERSTORMS PRODUCING HEAVY RAIN WILL IMPACT PORTIONS OF SUMTER
AND CLARENDON COUNTIES THROUGH 345 AM EDT...

AT 250 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
CLUSTER OF THUNDERSTORMS PRODUCING HEAVY RAINFALL...BETWEEN PINEWOOD
AND SUMMERTON...MOVING SOUTH NEAR 5 MPH. THESE STORMS WERE PRODUCING
RAINFALL RATES UP TO THREE INCHES PER HOUR. RADAR HAS ESTIMATED
BETWEEN 2.00 AND 4.00 INCHES OF RAIN MAY HAVE FALLEN.

SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE...
SUMMERTON...
LAKE MARION...

PREPARE NOW FOR THE FOLLOWING HAZARDS...
TORRENTIAL RAIN WHICH MAY PRODUCE LOCALIZED FLOODING...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REPORT FLOODING TO YOUR COUNTY SHERIFF...OR CALL THE NATIONAL
WEATHER SERVICE TOLL FREE AT 1...8 7 7...6 3 3...6 7 7 2.

&&

LAT...LON 3347 8015 3347 8043 3350 8044 3352 8047
      3353 8046 3353 8045 3354 8045 3356 8051
      3358 8052 3359 8050 3363 8054 3364 8053
      3368 8058 3373 8061 3389 8035
TIME...MOT...LOC 0647Z 341DEG 10KT 3364 8040

Special weather statement, Sep 7, 2:52 AM EDT, 2 hours 46 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
252 AM EDT FRI SEP 7 2012

SCZ031-038-070745-
CLARENDON-SUMTER-
252 AM EDT FRI SEP 7 2012

...THUNDERSTORMS PRODUCING HEAVY RAIN WILL IMPACT PORTIONS OF SUMTER
AND CLARENDON COUNTIES THROUGH 345 AM EDT...

AT 250 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
CLUSTER OF THUNDERSTORMS PRODUCING HEAVY RAINFALL...BETWEEN PINEWOOD
AND SUMMERTON...MOVING SOUTH NEAR 5 MPH. THESE STORMS WERE PRODUCING
RAINFALL RATES UP TO THREE INCHES PER HOUR. RADAR HAS ESTIMATED
BETWEEN 2.00 AND 4.00 INCHES OF RAIN MAY HAVE FALLEN.

SOME LOCATIONS THAT WILL BE AFFECTED INCLUDE...
SUMMERTON...
LAKE MARION...

PREPARE NOW FOR THE FOLLOWING HAZARDS...
TORRENTIAL RAIN WHICH MAY PRODUCE LOCALIZED FLOODING...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REPORT FLOODING TO YOUR COUNTY SHERIFF...OR CALL THE NATIONAL
WEATHER SERVICE TOLL FREE AT 1...8 7 7...6 3 3...6 7 7 2.

&&

LAT...LON 3347 8015 3347 8043 3350 8044 3352 8047
      3353 8046 3353 8045 3354 8045 3356 8051
      3358 8052 3359 8050 3363 8054 3364 8053
      3368 8058 3373 8061 3389 8035
TIME...MOT...LOC 0647Z 341DEG 10KT 3364 8040

Special weather statement, Sep 7, 5:18 AM EDT, 20 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 6, 11:30 PM EDT	Special Weather Statement	CAE	Sumter	60 min
Sep 7, 1:27 AM EDT	Special Weather Statement	CAE	Clarendon, Sumter	63 min
Sep 7, 2:51 AM EDT	Special Weather Statement	CAE	Clarendon	54 min
Sep 7, 2:52 AM EDT	Special Weather Statement	CAE	Clarendon	53 min
Sep 7, 5:18 AM EDT	Special Weather Statement	CAE	Orangeburg	57 min
Sep 7, 7:35 PM EDT	Special Weather Statement	CAE	Burke	40 min
Sep 7, 7:49 PM EDT	Severe Thunderstorm Warning	CAE	Burke	41 min

Nearby

Areal Flood Advisories in South Carolina, 2012 Every areal flood advisory in 2012

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.