Alert archive / Tennessee / Flash Flood Warnings in 2018

Flash Flood Warning 18, NWS Nashville, TN

June 23, 2018Wayne County, Tennessee

NWS Nashville, TN issued this flash flood warning at Jun 23, 2018, 11:23 PM CDT for Wayne 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: Jun 23, 2018, 11:23 PM CDT (04:23 UTC)
Expired: Jun 24, 2018, 2:15 AM CDT
In force: 3 hr
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

County Wayne County, TN

The radar

The Nashville radar (KOHX), 157 km from the middle of the area, began a volume at 04:24 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 00:00Z, 4.4 hours before the alert went out and 147 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: 389 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1162 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

As transmitted.

809 
WGUS54 KOHX 240423
FFWOHX
TNC181-240715-
/O.NEW.KOHX.FF.W.0018.180624T0423Z-180624T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Nashville TN
1123 PM CDT SAT JUN 23 2018

The National Weather Service in Nashville has issued a

* Flash Flood Warning for...
  Central Wayne County in Middle Tennessee...

* Until 215 AM CDT.

* At 1122 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. One and a half to three inches 
  of rain have fallen since early Saturday morning. Flash flooding 
  is becoming increasingly likely.

* Some locations that will experience flooding include...
  Waynesboro and Clifton. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 3539 8802 3539 8799 3541 8797 3543 8801
      3546 8798 3545 8797 3534 8758 3516 8758
      3532 8802 3535 8801 3536 8802

$$

Rose

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 Jun 23, 7:24 PM CDT, 3 hours 59 minutes earlier.

Area forecast discussion, Jun 23, 7:24 PM CDT, 3 hours 59 minutes before

Area Forecast Discussion
National Weather Service Nashville TN
724 PM CDT Sat Jun 23 2018

.DISCUSSION...

Updated the suite of forecast products to remove the late this
afternoon wording from the zone forecast product. With shwrs/tstms
moving now thru Wayne county, raised pops to likely and address
convection to numerous shwrs/tstms across Wayne, Lawrence, and
Giles Counties. Tweaked hrly temp, dewpoint, and wind speed/direction
grids. Remainder of forecast continues to be on track.

&&

.AVIATION...
00Z TAF DISCUSSION.

BNA/MQY/CKV/CSV...Radar scope is largely clear this hour, but more
convection is coming our way during the evening and possibly past
midnight owing to a weak shortwave passage. Expect more
thunderstorm development Sunday afternoon as the warm, moist air
mass currently in place is affected by yet another shortwave.
Don't expect much radiation fog overnight. No fog was observed at
any of our terminals last night and there's nothing to suggest
that conditions will be different tonight.

&&

.PRELIMINARY POINT TEMPS/POPS...
Nashville      72  88  72  90  73 /  50  50  40  40  10
Clarksville    71  86  71  88  73 /  50  50  40  40  10
Crossville     69  82  68  83  68 /  60  50  50  50  20
Columbia       71  88  71  89  72 /  50  50  30  40  10
Lawrenceburg   71  88  70  89  71 /  50  50  30  40  10
Waverly        71  86  71  89  73 /  50  50  40  40  10

&&

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

&&

DISCUSSION......31
AVIATION........08

Hazardous weather outlook, Jun 23, 5:47 PM CDT, 5 hours 36 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
547 PM CDT Sat Jun 23 2018

TNZ005>011-023>034-056>066-075-077>080-093>095-241100-
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-
547 PM CDT Sat Jun 23 2018

This Hazardous Weather Outlook is for portions of Middle
Tennessee.

.DAY ONE...Tonight

Isolated severe thunderstorms are possible over extreme
southwestern Middle Tennessee during the evening, producing
damaging winds, large hail and possibly isolated tornadoes

Later tonight, mainly after 900 pm CDT isolated strong
thunderstorms may push southward out of Kentucky, into the Mid-
State bringing along gusty straight line winds and heavy
downpours.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Isolated strong to severe thunderstorms are possible on Sunday
and Monday, producing damaging straight line winds and hail.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is possible at some point over the next
several days.

19

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 23, 7:46 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	29 min
Jun 23, 8:01 PM CDT	Tornado Warning	OHX	Wayne	29 min
Jun 23, 8:52 PM CDT	Areal Flood Advisory	OHX	Wayne	3 hr
Jun 23, 8:55 PM CDT	Tornado Warning	OHX	Lawrence, Wayne	35 min
Jun 23, 9:28 PM CDT	Tornado Warning	OHX	Lawrence, Wayne	32 min
Jun 23, 9:38 PM CDT	Flash Flood Warning	OHX	Lawrence, Wayne	3 hr
Jun 24, 12:40 PM CDT	Special Weather Statement	OHX	Cumberland	35 min
Jun 24, 1:59 PM CDT	Special Weather Statement	OHX	Marshall	31 min
Jun 24, 2:06 PM CDT	Special Weather Statement	OHX	Overton, Putnam	39 min
Jun 24, 2:23 PM CDT	Special Weather Statement	OHX	Coffee	22 min
Jun 24, 2:46 PM CDT	Special Weather Statement	OHX	Cumberland	44 min
Jun 24, 3:40 PM CDT	Special Weather Statement	OHX	Jackson	35 min
Jun 24, 3:49 PM CDT	Special Weather Statement	OHX	Cumberland	41 min
Jun 24, 4:04 PM CDT	Severe Thunderstorm Warning	OHX	Overton, Putnam	26 min
Jun 24, 4:24 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland, Fentress, Overton, Putnam	18 min
Jun 24, 4:30 PM CDT	Special Weather Statement	OHX	Fentress, Overton, Pickett	30 min
Jun 24, 4:45 PM CDT	Special Weather Statement	OHX	Jackson, Overton	30 min
Jun 24, 6:45 PM CDT	Special Weather Statement	OHX	Sumner	30 min
Jun 24, 6:50 PM CDT	Special Weather Statement	OHX	Bedford	25 min

Nearby

Flash Flood Warnings in Tennessee, 2018 Every flash flood warning 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.