Alert archive / Tennessee / Areal Flood Advisories in 2014

Areal Flood Advisory 21, NWS Nashville, TN

August 11, 2014Macon County, Sumner County, Tennessee

NWS Nashville, TN issued this areal flood advisory at Aug 11, 2014, 12:31 PM CDT for Macon County, Sumner County, Tennessee. It was in force for 119 min.

The area

The counties it named.

The facts

Issued: Aug 11, 2014, 12:31 PM CDT (17:31 UTC)
Expired: Aug 11, 2014, 2:30 PM CDT
In force: 119 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Macon County, TN, Sumner County, TN

The radar

The Nashville radar (KOHX), 41 km from the middle of the area, began a volume at 17:34 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

Nashville Metro, TN (KBNA), launched 12:00Z, 5.5 hours before the alert went out and 53 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: 1887 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 623 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

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 Nashville, TN wrote its last area forecast discussion before this areal flood advisory went out at Aug 11, 10:14 AM CDT, 2 hours 17 minutes earlier.

Area forecast discussion, Aug 11, 10:14 AM CDT, 2 hours 17 minutes before

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Hazardous weather outlook, Aug 11, 5:00 AM CDT, 7 hours 31 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
500 AM CDT MON AUG 11 2014

TNZ005>011-023>034-056>066-075-077>080-093>095-121030-
STEWART-MONTGOMERY-ROBERTSON-SUMNER-MACON-CLAY-PICKETT-HOUSTON-
HUMPHREYS-DICKSON-CHEATHAM-DAVIDSON-WILSON-TROUSDALE-SMITH-
JACKSON-PUTNAM-OVERTON-FENTRESS-PERRY-HICKMAN-LEWIS-WILLIAMSON-
MAURY-MARSHALL-RUTHERFORD-CANNON-DE KALB-WHITE-CUMBERLAND-BEDFORD-
COFFEE-WARREN-GRUNDY-VAN BUREN-WAYNE-LAWRENCE-GILES-
500 AM CDT MON AUG 11 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT.

MOIST AND UNSTABLE CONDITIONS MAY RESULT IN A FEW STRONG
THUNDERSTORMS TODAY AND TONIGHT. ALSO, MINOR FLOODING IS POSSIBLE
DURING HEAVIER DOWNPOURS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

NO WIDESPREAD SEVERE WEATHER IS EXPECTED AT THIS TIME.

ROSE

In the hours before

Special weather statement, Aug 11, 11:25 AM CDT, 1 hour 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
1125 AM CDT MON AUG 11 2014

TNZ008-009-111700-
MACON-SUMNER-
1125 AM CDT MON AUG 11 2014

...SIGNIFICANT WEATHER ADVISORY FOR MACON AND SUMNER COUNTIES...

AT 1123 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
TRACKING A STRONG THUNDERSTORM NEAR WESTMORELAND...MOVING EAST AT 20
MPH.

SOME LOCATIONS IN THE PATH INCLUDE OAK GROVE...BETHPAGE AND
WESTMORELAND.

WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM.

LAT...LON 3664 8607 3648 8601 3647 8618 3648 8619
      3649 8623 3647 8624 3647 8646 3659 8650
      3665 8628

SHAMBURGER

The office that day

Everything else NWS Nashville, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 11, 11:25 AM CDT	Special Weather Statement	OHX	Sumner	35 min
Aug 11, 12:40 PM CDT	Special Weather Statement	OHX	Clay	50 min
Aug 11, 1:16 PM CDT	Areal Flood Advisory	OHX	Clay, Jackson, Macon, Trousdale	119 min
Aug 11, 1:43 PM CDT	Special Weather Statement	OHX	Jackson	47 min
Aug 11, 2:09 PM CDT	Special Weather Statement	OHX	Davidson	36 min
Aug 11, 2:56 PM CDT	Special Weather Statement	OHX	Wilson	49 min
Aug 11, 3:06 PM CDT	Special Weather Statement	OHX	Jackson, Smith	39 min
Aug 11, 3:13 PM CDT	Severe Thunderstorm Warning	OHX	DeKalb, Jackson, Putnam, Smith, Wilson	47 min
Aug 11, 3:50 PM CDT	Special Weather Statement	OHX	DeKalb, Overton, Putnam	55 min
Aug 11, 4:27 PM CDT	Severe Thunderstorm Warning	OHX	DeKalb, Putnam, White	30 min
Aug 11, 4:38 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland, Fentress, Overton, Putnam, White	52 min
Aug 11, 4:43 PM CDT	Areal Flood Advisory	OHX	DeKalb, Wilson	2 hr
Aug 11, 6:09 PM CDT	Special Weather Statement	OHX	Davidson	36 min
Aug 11, 6:19 PM CDT	Areal Flood Advisory	OHX	Davidson, Rutherford, Sumner, Williamson, Wilson	116 min

Nearby

Areal Flood Advisories in Tennessee, 2014 Every areal flood advisory in 2014

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.