Alert archive / Tennessee / Special Weather Statements in 2012

Special Weather Statement, NWS Nashville, TN

May 21, 2012Giles County, Lawrence County, Tennessee

NWS Nashville, TN issued this special weather statement at May 21, 2012, 8:27 PM CDT for Giles County, Lawrence County, Tennessee. It was in force for 63 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 21, 2012, 8:27 PM CDT (01:27 UTC)
Expired
May 21, 2012, 9:30 PM CDT
In force
63 min
Issued by
NWS Nashville, TN

Counties Giles County, TN, Lawrence County, TN

The radar

The Northeast Alabama radar (KHTX), 131 km from the middle of the area, began a volume at 01:27 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 00:00Z, 1.5 hours before the alert went out and 242 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, Birmingham, AL at 00:00Z on 2012-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 174 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, Birmingham, AL at 00:00Z on 2012-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 square meters per square second.1939Sfc1 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
174 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
1734 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
12 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 21, 7:25 PM CDT, 1 hour 2 minutes earlier.

Area forecast discussion, May 21, 7:25 PM CDT, 1 hour 2 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
725 PM CDT MON MAY 21 2012

.UPDATE...

00Z TAF DISCUSSION.

&&

.AVIATION...

CONVECTION HAS MOVED SOUTH OF CKV BUT CONTINUES AROUND CSV WITH
SOME ISOLATED SHRA NEAR BNA. HEAVY TSRA WITH IFR OR LOWER VIS AND
MVFR CIGS WILL CONTINUE AT CSV FOR A COUPLE MORE HOURS...BUT ONLY
VCSH EXPECTED AT BNA THIS EVENING. OVERNIGHT...EXPECTED MVFR/IFR
VIS AT ALL AIRPORTS DUE TO WIDESPREAD RAINFALL TODAY. VFR
CONDITIONS RETURN TUESDAY MORNING WITH LIGHT NORTHWEST TO NORTH
WINDS CONTINUING.

&&

.PREV DISCUSSION... /ISSUED 318 PM CDT MON MAY 21 2012/

DISCUSSION...18Z FRONTAL POSITION FROM NCEP HAS THE FRONT ALONG A
CLARKSVILLE TN TO GREENVILLE MS LINE. DEWPOINT GRADIENT ON LATEST MSAS
ANALYSIS SEEMS TO INDICATE THAT IT IS A BIT FURTHER WEST. AT ANY RATE...
THE FRONT WILL PASS THE AREA THIS EVENING WITH POPS DIMINISHING OVERNIGHT
AND ENDING IN THE PLATEAU COUNTIES ON TUESDAY.

SPC HAS OUTLOOKED SLIGHT RISK SVR TSTMS FOR SOME OF OUR WRN
COUNTIES PLUS NRN MS AND WRN TN. SIMILAR TO YSTDA AND THE DAY
BEFORE...SOUNDING INDICATES WEAK SHEAR BUT GOOD THERMAL
INSTABILITY. HPC 24 RAINFALL TOTALS RUNNING .25 TO .50 INCHES WITH
MODELS SLIGHTLY HIGHER.

FORECAST IS DRY AFTER TUE. HOWEVER...THERE IS SOME DOUBT ABOUT TUE
NGT AND WED DUE TO THE MODELS TAKING THE SRN PORTION OF THE UPPER
TROUGH AND TEMPORARILY CUTTING IT OFF NEAR THE TN/NC BORDER FROM
THE MAIN FLOW. THIS MIGHT EXTEND THE CHANCE OF SHOWERS IN PLATEAU
COUNTIES IN THIS PERIOD.

MOSTLY DRY FOR WED THRU SUN AS A STRONG UPPER RIDGE BUILD OVER THE
AREA AND HIGHS IN THE 90S RETURNS TO THE FCST FOR THU THRU SUN.
UPPER RIDGE WEAKENS A BIT ON MON AND I HAVE INCLUDED A SLIGHT
CHANCE OF TSTMS FOR MON/MON NGT.

&&

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

55
Hazardous weather outlook, May 21, 3:43 PM CDT, 4 hours 44 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE NASHVILLE TN
343 PM CDT MON MAY 21 2012

TNZ005>011-022>034-056>066-075-077>080-093>095-222045-
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-DE KALB-WHITE-
CUMBERLAND-BEDFORD-COFFEE-WARREN-GRUNDY-VAN BUREN-WAYNE-LAWRENCE-
GILES-
343 PM CDT MON MAY 21 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TONIGHT

FRONTAL SYSTEM MOVING THROUGH THE AREA TONIGHT WITH A FEW STORMS
POSSIBLY HAVING STRONG GUSTY WINDS AND SMALL HAIL. OTHERWISE...NO HAZARDOUS
WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

JLM

In the hours before

Special weather statement, May 21, 6:03 PM CDT, 2 hours 24 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
603 PM CDT MON MAY 21 2012

TNZ077-212345-
COFFEE-
603 PM CDT MON MAY 21 2012

...SIGNIFICANT WEATHER ADVISORY FOR COFFEE COUNTY...

AT 558 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 7 MILES NORTHWEST OF MANCHESTER...MOVING
SOUTHEAST AT 15 MPH.

THIS STORM WILL BE NEAR...
  MANCHESTER BY 625 PM CDT.
  TULLAHOMA BY 635 PM CDT.

PENNY SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3531 8600 3534 8604 3535 8609 3536 8610
      3536 8615 3533 8619 3534 8624 3540 8627
      3545 8624 3558 8624 3563 8614 3535 8588
      3529 8592

SHAMBURGER
Special weather statement, May 21, 6:12 PM CDT, 2 hours 15 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
612 PM CDT MON MAY 21 2012

TNZ024-220000-
HUMPHREYS-
612 PM CDT MON MAY 21 2012

...SIGNIFICANT WEATHER ADVISORY FOR HUMPHREYS COUNTY...

AT 608 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR WAVERLY...MOVING SOUTHEAST AT 15 MPH.

THIS STORM WILL BE NEAR...
  HURRICANE MILLS BY 620 PM CDT.

NICKEL SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3606 8798 3613 8792 3616 8792 3620 8785
      3606 8755 3597 8753 3595 8756 3595 8760
      3593 8763 3591 8770 3584 8772 3584 8787
      3588 8793 3594 8793 3594 8799 3596 8802

SHAMBURGER
Special weather statement, May 21, 6:16 PM CDT, 2 hours 11 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
616 PM CDT MON MAY 21 2012

TNZ060-095-220000-
GILES-MAURY-
616 PM CDT MON MAY 21 2012

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN GILES AND SOUTHERN
MAURY COUNTIES...

AT 612 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR MOUNT PLEASANT...OR 12 MILES SOUTHWEST OF
COLUMBIA...MOVING SOUTHEAST AT 10 MPH.

PENNY SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3529 8709 3539 8722 3540 8721 3544 8722
      3543 8724 3545 8729 3548 8727 3550 8729
      3550 8727 3554 8729 3563 8721 3546 8692
      3545 8695 3542 8696

SHAMBURGER
Special weather statement, May 21, 7:45 PM CDT, 42 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
745 PM CDT MON MAY 21 2012

TNZ094-095-220130-
GILES-LAWRENCE-
745 PM CDT MON MAY 21 2012

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN GILES AND LAWRENCE
COUNTIES...

AT 741 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR LAWRENCEBURG...MOVING SOUTHEAST AT 15 MPH.

PENNY SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS
STORM.

LOCATIONS IN THE PATH OF THIS STORM INCLUDE LORETTO AND MINOR HILL.

LAT...LON 3500 8723 3500 8740 3520 8753 3532 8736
      3508 8704 3499 8717 3499 8722

SHAMBURGER
Special weather statement, May 21, 7:58 PM CDT, 29 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
758 PM CDT MON MAY 21 2012

TNZ093-094-220145-
LAWRENCE-WAYNE-
758 PM CDT MON MAY 21 2012

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN LAWRENCE AND WAYNE
COUNTIES...

AT 755 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR WAYNESBORO...MOVING SOUTHEAST AT 15 MPH.

PENNY SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3517 8736 3501 8759 3529 8785 3541 8768

SHAMBURGER
Special weather statement, May 21, 8:27 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
827 PM CDT MON MAY 21 2012

TNZ093>095-220230-
GILES-LAWRENCE-WAYNE-
827 PM CDT MON MAY 21 2012

...SIGNIFICANT WEATHER ADVISORY FOR GILES...LAWRENCE AND WAYNE
COUNTIES...

AT 822 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A CLUSTER OF STRONG THUNDERSTORMS FROM WAYNESBORO TO ETHRIDGE TO
MINOR HILL...MOVING SOUTHEAST AT 20 MPH.

THESE STORMS WILL BE NEAR...
  LAWRENCEBURG BY 850 PM CDT.
  LORETTO BY 920 PM CDT.

PENNY SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THESE
STORMS.

LAT...LON 3500 8765 3530 8782 3540 8753 3540 8752
      3543 8747 3542 8745 3543 8745 3543 8724
      3500 8683

SHAMBURER

The office that day

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

IssuedProductOfficeCountiesLasted
May 21, 7:06 PM CDTAreal Flood AdvisoryOHXCumberland114 min
May 21, 7:45 PM CDTSpecial Weather StatementOHXLawrence45 min
May 21, 7:58 PM CDTSpecial Weather StatementOHXLawrence47 min
May 21, 9:06 PM CDTAreal Flood AdvisoryOHXLawrence114 min
May 22, 1:34 PM CDTAreal Flood AdvisoryOHXFentress3 hr
May 22, 6:06 PM CDTSpecial Weather StatementOHXOverton54 min
May 22, 6:14 PM CDTAreal Flood AdvisoryOHXOverton3 hr
May 22, 6:15 PM CDTAreal Flood AdvisoryOHXGrundy35 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.