Alert archive / Tennessee / Flood Watches in 2009

Flood Watch 4, NWS Nashville, TN

May 5, 200924 counties in Tennessee

NWS Nashville, TN issued this flood watch at May 5, 2009, 3:10 PM CDT for 24 counties in Tennessee. It took effect at May 6, 2009, 7:00 AM CDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: May 5, 2009, 3:10 PM CDT (20:10 UTC)
In effect from: May 6, 2009, 7:00 AM CDT
Expired: May 6, 2009, 2:08 PM CDT
In force: 7 hr
Issued by: NWS Nashville, TN
Flood severity: None

All 24 counties

Bedford County, TN, Benton County, TN, Cannon County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Giles County, TN, Grundy County, TN, Hickman County, TN, Humphreys County, TN, Lawrence County, TN, Lewis County, TN, Marshall County, TN, Maury County, TN, Perry County, TN, Pickett County, TN, Putnam County, TN, Rutherford County, TN, Van Buren County, TN, Warren County, TN, Wayne County, TN, White County, TN, Williamson County, TN

The radar

The Nashville radar (KOHX), 55 km from the middle of the area, began a volume at 20:16 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

Birmingham, AL (KBMX), launched 12:00Z, 8.2 hours before the alert went out and 288 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: 213 J/kg
Mixed-layer CIN: -111 J/kg
Mixed-layer LCL: 752 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flood watch 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 flood watch went out at May 5, 2:50 PM CDT, 20 minutes earlier.

Area forecast discussion, May 5, 2:50 PM CDT, 20 minutes before

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Hazardous weather outlook, May 5, 5:35 AM CDT, 9 hours 35 minutes before

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In the hours before

Special weather statement, May 5, 10:57 AM CDT, 4 hours 13 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 5, 2:04 PM CDT	River Flood Warning	OHX	Decatur, Hardin, Perry, Wayne	4 days

Nearby

Flood Watches in Tennessee, 2009 Every flood watch 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.