Alert archive / Tennessee / Flash Flood Warnings in 2009

Flash Flood Warning 36, NWS Nashville, TN

May 9, 2009White County, Tennessee

NWS Nashville, TN issued this flash flood warning at May 9, 2009, 11:45 AM CDT for White County, Tennessee. It was in force for 2 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: May 9, 2009, 11:45 AM CDT (16:45 UTC)
Expired: May 9, 2009, 1:45 PM CDT
In force: 2 hr
Issued by: NWS Nashville, TN
Area: Storm-based polygon
Flood severity: None

County White County, TN

The radar

The Nashville radar (KOHX), 111 km from the middle of the area, began a volume at 16:37 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.

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, 4.8 hours before the alert went out and 112 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: 216 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 493 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: -33 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KOHX 091645
FFWOHX
TNC185-091845-
/O.NEW.KOHX.FF.W.0036.090509T1645Z-090509T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
1145 AM CDT SAT MAY 9 2009

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN WHITE COUNTY IN MIDDLE TENNESSEE...
  THIS INCLUDES THE CITY OF SPARTA...

* UNTIL 145 PM CDT

* AT 1141 AM CDT...TRAINED WEATHER SPOTTERS REPORTED FLASH FLOODING 
  ALONG THE CALFKILLER RIVER. 

* THE STORM PRODUCING FLASH FLOODING WILL OTHERWISE REMAIN OVER
  MAINLY RURAL AREAS OF THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 3586 8544 3602 8553 3608 8546 3604 8533
      3590 8522 3589 8523

$$

07

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 May 9, 3:40 AM CDT, 8 hours 5 minutes earlier.

Area forecast discussion, May 9, 3:40 AM CDT, 8 hours 5 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
340 AM CDT SAT MAY 9 2009

.DISCUSSION...
SFC HIGH PRES WORKING EAST OF THE ROCKIES ATTM. MODELS LOOK GOOD
WITH STRONG PUSH OF SFC TROUGH/COLD FRONT SOUTH ACR MID TN TODAY.
PLENTY OF MOISTURE ALONG FRONT.

ONE HOUR FFG VALUES AROUND ONE INCH...WITH NUMEROUS REPORTS OF
STREET FLOODING STEWART-MONTGOMERY-ROBERTSON COUNTIES LAST COUPLE
OF HOURS.

FLASH FLOODING WL CONTINUE TO BE A THREAT THIS MORNING...INTO SOUTH
AND EAST PORTIONS OF THE MIDSTATE THIS AFTERNOON. UPDATE TO FLASH
FLOOD WATCH CONFIGURATION WITH ROUTINE ISSUANCE.

COLD FRONT WL CLEAR SOUTH MID TN THIS EVENING. LIKELY POPS REMAIN
IN THE SOUTH WITH SOME OVERRUNNING. WL TIME BACK CLOUDS/POPS SUN-
MON WITH LESS POST-FRONTAL MOISTURE. DRY MON NIGHT-TUE NIGHT. NEXT
CHANCE OF PCPN WED-THU WITH NEXT FRONTAL SYSTEM. SLIGHT COOLDOWN
NEXT WEEKEND.

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      73  55  70  52 /  90  40  20  30
CLARKSVILLE    72  52  70  49 /  70  30  10  20
CROSSVILLE     72  52  67  47 /  90  40  30  40
COLUMBIA       75  57  70  53 /  90  50  30  40
LAWRENCEBURG   76  58  70  53 /  80  60  40  40
WAVERLY        73  54  70  50 /  90  30  20  30

&&

.OHX WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH THROUGH THIS AFTERNOON FOR TNZ005>011-022>034-
056>066-075-077>080-093>095.

&&

04

Hazardous weather outlook, May 9, 5:27 AM CDT, 6 hours 18 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
527 AM CDT SAT MAY 9 2009

TNZ005>011-022>034-056>066-075-077>080-093>095-101030-
STEWART-MONTGOMERY-ROBERTSON-SUMNER-MACON-CLAY-PICKETT-BENTON-
HOUSTON-HUMPHREYS-DICKSON-CHEATHAM-DAVIDSON-WILSON-TROUSDALE-
SMITH-JACKSON-PUTNAM-OVERTON-FENTRESS-PERRY-HICKMAN-LEWIS-
WILLIAMSON-MAURY-MARSHALL-RUTHERFORD-CANNON-DEKALB-WHITE-
CUMBERLAND-BEDFORD-COFFEE-WARREN-GRUNDY-VAN BUREN-WAYNE-LAWRENCE-
GILES-
527 AM CDT SAT MAY 9 2009

...FLASH FLOOD WATCH IN EFFECT THROUGH THIS AFTERNOON...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

...FLASH FLOOD WATCH IN EFFECT THROUGH THIS AFTERNOON...

A COLD FRONT WILL MARCH ACROSS MIDDLE TENNESSEE TODAY. PERIODS OF
MODERATE TO HEAVY RAINFALL ARE LIKELY...WITH ONE TO TWO INCHES OF
ADDITIONAL RAINFALL.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS AND LOCAL EMERGENCY MANAGEMENT OFFICIALS ARE ENCOURAGED
TO REPORT HEAVY RAINFALL AMOUNTS TO THE NATIONAL WEATHER SERVICE
IN NASHVILLE.

04

The office that day

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

Issued	Product	Office	Counties	Lasted
May 8, 8:57 PM CDT	River Flood Advisory	OHX	Humphreys	21 hr
May 8, 8:57 PM CDT	River Flood Advisory	OHX	Montgomery	36 hr
May 8, 8:57 PM CDT	River Flood Advisory	OHX	Montgomery, Robertson	36 hr
May 8, 11:59 PM CDT	Severe Thunderstorm Warning	OHX	Stewart	31 min
May 9, 1:22 AM CDT	Severe Thunderstorm Warning	OHX	Montgomery, Robertson	38 min
May 9, 1:25 AM CDT	Flash Flood Warning	OHX	Montgomery, Robertson	3 hr
May 9, 1:52 AM CDT	Severe Thunderstorm Warning	OHX	Macon, Sumner	38 min
May 9, 1:56 AM CDT	Flash Flood Warning	OHX	Stewart	3 hr
May 9, 3:56 AM CDT	Flash Flood Warning	OHX	Macon, Robertson, Sumner, Trousdale	3 hr
May 9, 4:12 AM CDT	Flash Flood Warning	OHX	Cheatham	3 hr
May 9, 4:21 AM CDT	Flash Flood Warning	OHX	Davidson, Jackson, Smith, Wilson	3 hr
May 9, 5:01 AM CDT	Flash Flood Warning	OHX	Putnam	3 hr
May 9, 6:35 AM CDT	Flash Flood Warning	OHX	DeKalb	3 hr
May 9, 7:07 AM CDT	Flash Flood Warning	OHX	White	3 hr
May 9, 7:30 AM CDT	River Flood Warning	OHX	Stewart	7 hr
May 9, 7:30 AM CDT	River Flood Warning	OHX	Davidson	4 hr
May 9, 8:02 AM CDT	River Flood Warning	OHX	Davidson	4 hr
May 9, 8:29 AM CDT	Flash Flood Warning	OHX	Wilson	3 hr
May 9, 8:34 AM CDT	Flash Flood Warning	OHX	Cumberland	3 hr
May 9, 6:09 PM CDT	River Flood Warning	OHX	Montgomery, Robertson	18 hr
May 9, 6:28 PM CDT	River Flood Advisory	OHX	Decatur, Hardin, Perry, Wayne	36 hr

Nearby

Flash Flood Warnings in Tennessee, 2009 Every flash flood warning in 2009

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.