Alert archive / Tennessee / Special Weather Statements in 2012

Special Weather Statement, NWS Nashville, TN

September 2, 2012Marshall County, Tennessee

NWS Nashville, TN issued this special weather statement at Sep 2, 2012, 6:09 PM CDT for Marshall County, Tennessee. It was in force for 36 min. 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 2, 2012, 6:09 PM CDT (23:09 UTC)
Expired: Sep 2, 2012, 6:45 PM CDT
In force: 36 min
Issued by: NWS Nashville, TN

County Marshall County, TN

The radar

The Nashville radar (KOHX), 90 km from the middle of the area, began a volume at 23:09 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, 11.2 hours before the alert went out and 77 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: 257 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 627 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Sep 2, 4:36 PM CDT, 1 hour 33 minutes earlier.

Area forecast discussion, Sep 2, 4:36 PM CDT, 1 hour 33 minutes before

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Hazardous weather outlook, Sep 2, 5:10 AM CDT, 12 hours 59 minutes before

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In the hours before

Special weather statement, Sep 2, 4:43 PM CDT, 1 hour 26 minutes before

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Special weather statement, Sep 2, 6:09 PM CDT, 0 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
Sep 1, 9:18 PM CDT	Special Weather Statement	OHX	Benton, Houston, Humphreys, Perry	57 min
Sep 1, 10:32 PM CDT	Special Weather Statement	OHX	Cheatham, Davidson, Dickson, Montgomery, Robertson	43 min
Sep 2, 1:11 AM CDT	Special Weather Statement	OHX	Cheatham, Davidson, Dickson, Montgomery, Robertson	2 hr
Sep 2, 4:43 PM CDT	Special Weather Statement	OHX	Williamson	32 min
Sep 2, 6:36 PM CDT	Special Weather Statement	OHX	Putnam	39 min

Nearby

Special Weather Statements in Tennessee, 2012 Every special weather statement in 2012

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.