Alert archive / Tennessee / Flash Flood Warnings in 2009

Flash Flood Warning 34, NWS Huntsville, AL

May 15, 2009Franklin County, Tennessee

NWS Huntsville, AL issued this flash flood warning at May 15, 2009, 1:11 PM CDT for Franklin County, Tennessee. It was in force for 71 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 15, 2009, 1:11 PM CDT (18:11 UTC)
Expired: May 15, 2009, 2:22 PM CDT
In force: 71 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Flood severity: None

County Franklin County, TN

The radar

The Northeast Alabama radar (KHTX), 25 km from the middle of the area, began a volume at 18:11 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, 6.2 hours before the alert went out and 118 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: 1735 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 673 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: 14 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 flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Huntsville, AL wrote its last area forecast discussion before this flash flood warning went out at May 15, 12:09 PM CDT, 1 hour 2 minutes earlier.

Area forecast discussion, May 15, 12:09 PM CDT, 1 hour 2 minutes before

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Hazardous weather outlook, May 15, 11:45 AM CDT, 1 hour 26 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1145 AM CDT FRI MAY 15 2009

ALZ001>010-016-TNZ076-096-097-160400-
LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN-
MARSHALL-JACKSON-DEKALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN-
1145 AM CDT FRI MAY 15 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH ALABAMA AND PORTIONS
OF SOUTHERN MIDDLE TENNESSEE.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP ACROSS THE REGION
THROUGH THIS EVENING...AND MAY LINGER INTO TONIGHT AS A COLD FRONT
APPROACHES THE REGION FROM THE NORTHWEST. A FEW OF THESE STORMS MAY
BECOME STRONG TO SEVERE...CAPABLE OF PRODUCING DAMAGING WINDS AND
FREQUENT LIGHTNING. HOWEVER...DUE TO ABUNDANT MOISTURE AND
RELATIVELY SLOW STORM MOTION...CONDITIONS ARE FAVORABLE FOR
LOCALIZED FLOODING WHERE STORMS DEVELOP.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...

THE COLD FRONT WILL SLOWLY MOVE INTO THE CENTRAL TENNESSEE VALLEY
SATURDAY AND SATURDAY NIGHT...PROMPTING ADDITIONAL SHOWER AND
THUNDERSTORM DEVELOPMENT. A FEW STRONG TO SEVERE THUNDERSTORMS ARE
POSSIBLE...BUT LOCALIZED FLOODING IS LIKELY TO REMAIN THE PRIMARY
THREAT. THE THREAT FOR RAIN AND THUNDERSTORMS WILL DIMINISH
SIGNIFICANTLY BY MIDDAY SUNDAY AS THE FRONT PUSHES SOUTH OF THE
TENNESSEE VALLEY.

.SPOTTER CALL TO ACTION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL
IS NOT ANTICIPATED AT THIS TIME.

BCC/CBD

In the hours before

Special weather statement, May 15, 11:36 AM CDT, 1 hour 35 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1136 AM CDT FRI MAY 15 2009

ALZ006-TNZ096-151700-
LINCOLN-MADISON-
1136 AM CDT FRI MAY 15 2009

...SIGNIFICANT WEATHER ALERT FOR SOUTHEAST LINCOLN AND EASTERN
MADISON COUNTIES UNTIL NOON CDT...

AT 1134 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A CLUSTER OF STRONG THUNDERSTORMS EXTENDING FROM PLEVNA TO NEAR
MAYSVILLE...MOVING NORTH AT 10 MPH.

PEA SIZE HAIL...WIND GUSTS UP TO 50 MPH...AND FREQUENT CLOUD TO
GROUND LIGHTNING ARE POSSIBLE FROM THESE STORMS.

* LOCATIONS IN OR NEAR THE PATH INCLUDE...
  NEW MARKET.
  PLEVNA.
  ELORA...FLINTVILLE.

REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO THE
STORM TO BE STRUCK BY LIGHTNING. SEEK SAFE SHELTER IMMEDIATELY.

CBD

Special weather statement, May 15, 12:07 PM CDT, 1 hour 4 minutes before

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Special weather statement, May 15, 12:12 PM CDT, 59 minutes before

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Special weather statement, May 15, 12:25 PM CDT, 46 minutes before

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Special weather statement, May 15, 12:54 PM CDT, 17 minutes before

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Special weather statement, May 15, 12:59 PM CDT, 12 minutes before

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The office that day

Everything else NWS Huntsville, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 15, 11:48 AM CDT	Severe Thunderstorm Warning	HUN	Madison	42 min
May 15, 12:31 PM CDT	Severe Thunderstorm Warning	HUN	Limestone	29 min
May 15, 3:51 PM CDT	Severe Thunderstorm Warning	HUN	Lauderdale	24 min
May 15, 4:22 PM CDT	Severe Thunderstorm Warning	HUN	Lauderdale	23 min
May 15, 4:42 PM CDT	Flash Flood Warning	HUN	Lauderdale	44 min
May 15, 5:17 PM CDT	Severe Thunderstorm Warning	HUN	Limestone	28 min
May 15, 5:46 PM CDT	Severe Thunderstorm Warning	HUN	Limestone	29 min
May 15, 5:59 PM CDT	Severe Thunderstorm Warning	HUN	Madison	31 min
May 15, 6:20 PM CDT	Flash Flood Warning	HUN	Madison	3 hr
May 15, 6:29 PM CDT	Severe Thunderstorm Warning	HUN	Madison	31 min
May 15, 1:09 PM CDT	Severe Thunderstorm Warning	HUN	Franklin	36 min
May 15, 3:59 PM CDT	Severe Thunderstorm Warning	HUN	Lincoln	31 min
May 15, 4:19 PM CDT	Flash Flood Warning	HUN	Lincoln	116 min
May 15, 4:38 PM CDT	Severe Thunderstorm Warning	HUN	Lincoln	37 min
May 15, 4:48 PM CDT	Severe Thunderstorm Warning	HUN	Lincoln	27 min
May 15, 5:29 PM CDT	Flash Flood Warning	HUN	Lincoln	2 hr
May 15, 5:53 PM CDT	Severe Thunderstorm Warning	HUN	Lincoln	52 min
May 15, 6:42 PM CDT	Severe Thunderstorm Warning	HUN	Lincoln	33 min

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.