Alert archive / Tennessee / Flash Flood Warnings in 2015

Flash Flood Warning 15, NWS Nashville, TN

September 9, 2015Lawrence County, Tennessee

NWS Nashville, TN issued this flash flood warning at Sep 9, 2015, 1:48 PM CDT for Lawrence County, Tennessee. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 9, 2015, 1:48 PM CDT (18:48 UTC)
Expired: Sep 9, 2015, 4:45 PM CDT
In force: 3 hr
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

County Lawrence County, TN

The radar

The Nashville radar (KOHX), 123 km from the middle of the area, began a volume at 18:47 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 6.8 hours before the alert went out and 111 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: 358 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 916 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

041 
WGUS54 KOHX 091848
FFWOHX
TNC099-092145-
/O.NEW.KOHX.FF.W.0015.150909T1848Z-150909T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
ISSUED BY NATIONAL WEATHER SERVICE JACKSON MS
148 PM CDT WED SEP 9 2015

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN LAWRENCE COUNTY IN MIDDLE TENNESSEE...

* UNTIL 445 PM CDT
    
* AT 148 PM CDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO THREE INCHES OF RAIN HAVE
  ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  SUMMERTOWN...ETHRIDGE AND HENRYVILLE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3539 8757 3545 8731 3543 8721 3534 8722
      3528 8758

$$

GRG

1 follow-up statement

481 
WGUS74 KOHX 092117
FFSOHX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
417 PM CDT WED SEP 9 2015

TNC099-092145-
/O.CON.KOHX.FF.W.0015.000000T0000Z-150909T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LAWRENCE TN-
417 PM CDT WED SEP 9 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM CDT FOR
NORTHERN LAWRENCE COUNTY...

AT 416 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY
RAIN ACROSS THE WARNED AREA. UP TO THREE INCHES OF RAIN HAVE ALREADY
FALLEN THIS AFTERNOON. 

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
SUMMERTOWN...ETHRIDGE AND HENRYVILLE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 3539 8757 3545 8731 3543 8721 3534 8722
      3528 8758

$$

13

What forecasters said that day

The local office's own words before this flash flood warning 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 flash flood warning went out at Sep 9, 12:30 PM CDT, 1 hour 18 minutes earlier.

Area forecast discussion, Sep 9, 12:30 PM CDT, 1 hour 18 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE NASHVILLE TN
ISSUED BY NATIONAL WEATHER SERVICE JACKSON MS
1230 PM CDT WED SEP 9 2015

.AVIATION UPDATE...VCTS WILL CONTINUE TO DEVELOP AND PASS AROUND
THE TAF SITES THROUGH THE AFTERNOON AND EVENING...OTHERWISE VFR
CONDITIONS WILL PREVAIL. AFTER 06Z...MVFR CIGS AND VSBYS WILL MOVE
INTO THE CKV AND BNA AREAS AS AREAS OF RAIN BREAK OUT. THESE
CONDITIONS WILL LAST THROUGH THE REMAINDER OF THE PERIOD WITH THE
RAIN TAPERING OFF AFTER 14Z. FURTHER EAST AROUND CSV...MVFR
CIGS/VSBYS WILL MOVE IN BY 10Z WITH AREAS OF RAIN DEVELOPING BY
12Z. THESE CONDITIONS WILL PERSIST THROUGH THE END OF THE
PERIOD./26/

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      86  70  83  66 /  60  60  50  20
CLARKSVILLE    85  68  82  63 /  60  60  30  10
CROSSVILLE     80  66  77  63 /  70  60  60  40
COLUMBIA       86  68  81  64 /  60  60  60  20
LAWRENCEBURG   86  68  82  65 /  60  60  60  20
WAVERLY        85  68  83  64 /  60  60  40  20

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

Hazardous weather outlook, Sep 9, 5:00 AM CDT, 8 hours 48 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
500 AM CDT WED SEP 9 2015

TNZ005>011-023>034-056>066-075-077>080-093>095-101000-
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 WED SEP 9 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF MIDDLE
TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

55

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 9, 2:23 PM CDT	Special Weather Statement	OHX	Williamson	37 min
Sep 9, 2:35 PM CDT	Special Weather Statement	OHX	Humphreys	25 min
Sep 9, 2:49 PM CDT	Special Weather Statement	OHX	Macon	26 min
Sep 9, 3:23 PM CDT	Special Weather Statement	OHX	Wilson	52 min
Sep 9, 3:32 PM CDT	Special Weather Statement	OHX	Davidson	43 min
Sep 9, 3:51 PM CDT	Special Weather Statement	OHX	Perry	24 min
Sep 9, 3:58 PM CDT	Special Weather Statement	OHX	Wayne	47 min
Sep 9, 4:11 PM CDT	Areal Flood Advisory	OHX	Macon, Sumner, Trousdale	2 hr
Sep 9, 4:36 PM CDT	Special Weather Statement	OHX	Wilson	24 min
Sep 9, 4:43 PM CDT	Special Weather Statement	OHX	Cheatham, Davidson, Dickson, Hickman, Lewis, Maury and 3 more	62 min
Sep 9, 4:50 PM CDT	Flash Flood Warning	OHX	Lawrence, Lewis, Maury	115 min
Sep 9, 4:55 PM CDT	Special Weather Statement	OHX	Cheatham, Davidson, Dickson, Hickman, Lewis, Maury and 3 more	50 min
Sep 9, 5:17 PM CDT	Areal Flood Advisory	OHX	Montgomery, Robertson	58 min
Sep 9, 6:10 PM CDT	Areal Flood Advisory	OHX	Davidson, Williamson	50 min

Nearby

Flash Flood Warnings in Tennessee, 2015 Every flash flood warning in 2015

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.