Alert archive / Tennessee / Special Weather Statements in 2012

Special Weather Statement, NWS Nashville, TN

May 5, 201227 counties in Tennessee

NWS Nashville, TN issued this special weather statement at May 5, 2012, 5:28 AM CDT for 27 counties in Tennessee. It was in force for 62 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
May 5, 2012, 5:28 AM CDT (10:28 UTC)
Expired
May 5, 2012, 6:30 AM CDT
In force
62 min
Issued by
NWS Nashville, TN
All 27 counties

Benton County, TN, Cannon County, TN, Cheatham County, TN, Clay County, TN, Cumberland County, TN, Davidson County, TN, DeKalb County, TN, Dickson County, TN, Fentress County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Jackson County, TN, Macon County, TN, Montgomery County, TN, Overton County, TN, Pickett County, TN, Putnam County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 26 km from the middle of the area, began a volume at 10:28 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 00:00Z, 10.5 hours before the alert went out and 22 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-pSkew-T log-p diagram, Nashville Metro, TN at 00:00Z on 2012-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1078 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 00:00Z on 2012-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1078 J/kg
Mixed-layer CIN
-70 J/kg
Mixed-layer LCL
1542 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
111 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.6

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 May 5, 4:16 AM CDT, 1 hour 12 minutes earlier.

Area forecast discussion, May 5, 4:16 AM CDT, 1 hour 12 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
416 AM CDT SAT MAY 5 2012

.DISCUSSION...
FRONTAL BOUNDARY ACROSS THE OH VALLEY SINKING SLOWLY SOUTH...WITH
PRETTY HEALTHY LEWP AHEAD DROPPING SOUTHEAST IN NORTHWEST ML FLOW.
THIS TREND EXPECTED TO CONTINUE INTO THE LATE MORNING...WITH
STRONG/SEVERE STORMS CLIPPING THE EXTREME NORTH AND EAST COUNTIES
EARLY THIS MORNING. LINE THEN EXPECTED TO WEAKEN SOME 12-18Z...BECOMING
MORE SCT IN NATURE THIS AFTERNOON. AIRMASS REMAINS PLENTY UNSTABLE
AND ISO SEVERE STILL IN THE EQUATION LATER TODAY. BEST CHANCE REMAINS
ACROSS THE NORTH AND EAST.

THIS TREND HOLDS INTO THE FIRST PART OF NEXT WEEK AS RIDGES ACROSS
THE REGION REMAIN DIRTY...WITH SERIES OF PASSING IMPULSES. THIS
COMBINED WITH WEAK SFC VICINITY BOUNDARY AND UNSTABLE AIR WILL
KEEP ISO-SCT TSTMS GOING THRU 12Z MON.

LATER MON...THINGS BECOME LITTLE BETTER ORGANIZED AS COLD FRONT
DROPS INTO THE MS RIVER VALLEY AS SFC LOW CROSSES THE MIDWEST.
THIS WILL INCREASE LL FORCING AS WELL AS MOISTURE ADVECTION AHEAD
ALLOWING STORMS TO BECOME MORE WIDESPREAD ACROSS THE NORTH/WEST.
ML/UL FLOW NOT ESPECIALLY STRONG THUS COLD FRONT WILL BE SLOW TO
MOVE ACROSS THE MID-STATE. COLD FRONT LOOKS TO MOVE INTO THE CWA
AROUND 12Z TUE...THEN TAKE MOST OF THE DAY TO PUSH EAST. THIS WILL
KEEP SHWRS/STMS QUITE WIDESPREAD MON NIGHT THRU TUE.

SHWRS/STORMS DECREASE DRASTICALLY TUE NIGHT BEHIND FRONT...BUT
PASSING ML/UL TROUGH AXIS POSSIBLY SETTING OFF A FEW SHOWERS
NORTHEAST ON WED.

BEHIND FRONT AND UPPER TROUGHS...DRY AND COOLER WEATHER EXPECTED
TO RETURN WED NIGHT WHICH AT THIS POINT LOOKS TO HOLD INTO THE
FIRST PART OF THE WEEKEND.

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      89  68  88  69 /  40  20  30  30
CLARKSVILLE    89  66  88  67 /  30  20  30  30
CROSSVILLE     84  61  83  63 /  50  20  20  30
COLUMBIA       90  67  88  68 /  30  20  30  30
LAWRENCEBURG   90  67  88  66 /  20  20  30  40
WAVERLY        90  66  88  67 /  30  20  30  30

&&

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

07
Hazardous weather outlook, May 5, 5:24 AM CDT, 4 minutes before
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In the hours before

Special weather statement, May 5, 4:07 AM CDT, 1 hour 21 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
407 AM CDT SAT MAY 5 2012

TNZ005>011-023-025>034-051000-
CHEATHAM-CLAY-DAVIDSON-DICKSON-FENTRESS-HOUSTON-JACKSON-MACON-
MONTGOMERY-OVERTON-PICKETT-PUTNAM-ROBERTSON-SMITH-STEWART-SUMNER-
TROUSDALE-WILSON-
407 AM CDT SAT MAY 5 2012

...SIGNIFICANT WEATHER ADVISORY FOR CHEATHAM...CLAY...DAVIDSON...
DICKSON...FENTRESS...HOUSTON...JACKSON...MACON...MONTGOMERY...
OVERTON...PICKETT...PUTNAM...ROBERTSON...SMITH...STEWART...SUMNER...
TROUSDALE AND WILSON COUNTIES...

AT 402 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS ARE TRACKING
A LINE OF STRONG TO SEVERE THUNDERSTORMS CURRENTLY ALIGNED WEST TO
EAST ACROSS SOUTHERN KENTUCKY. A GUST FRONT HAS PUSHED AHEAD OF THE
MAIN LINE OF STORMS AND WILL BEGIN AFFECTING THE NORTHERN TIER OF
COUNTIES OF ROBERTSON AND SUMNER AROUND 5 AM CDT.

WINDS 40 TO 50 MPH ARE EXPECTED.

LAT...LON 3629 8479 3629 8487 3615 8491 3617 8503
      3613 8513 3624 8774 3664 8773 3661 8479
      3641 8466

BOYD
Special weather statement, May 5, 5:28 AM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 5, 4:07 AM CDTSpecial Weather StatementOHXCheatham, Clay, Fentress, Houston, Jackson, Macon and 7 more53 min
May 5, 4:39 AM CDTTornado WarningOHXClay, Overton, Pickett36 min
May 5, 5:12 AM CDTSevere Thunderstorm WarningOHXFentress33 min
May 5, 7:59 AM CDTSpecial Weather StatementOHXMarshall, Maury61 min

Nearby

Special Weather Statements in Tennessee, 2012Every 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.