Alert archive / Tennessee / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 321, NWS Nashville, TN

August 21, 2010Giles County, Marshall County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Aug 21, 2010, 7:30 PM CDT for Giles County, Marshall County, Tennessee. It was in force for 60 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: Aug 21, 2010, 7:30 PM CDT (00:30 UTC)
Expired: Aug 21, 2010, 8:30 PM CDT
In force: 60 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Giles County, TN, Marshall County, TN

The radar

The Northeast Alabama radar (KHTX), 87 km from the middle of the area, began a volume at 00:30 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.

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 21, 2:46 PM CDT, 4 hours 44 minutes earlier.

Area forecast discussion, Aug 21, 2:46 PM CDT, 4 hours 44 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
246 PM CDT SAT AUG 21 2010

.DISCUSSION...
CONVECTION IN LINEAR MODE EXITING PLATEAU AND DOWN ALONG ALABAMA BORDER
AT MID-AFTERNOON. BOTHERSOME SURFACE WARM FRONT DRAPED FROM SOUTHEAST
MISSOURI DOWN THROUGH NORTHERN PART OF WEST TENNESSEE ACROSS
SOUTHERN MIDDLE TENNESSEE INTO CHATTANOOGA AREA. MUCH HOTTER TEMPS
SOUTH AND WEST OF THIS FRONT. ANOTHER FRONT OFF TO OUR NORTHWEST
WILL DROP SOUTHEAST TONIGHT AND INTO MIDDLE TENNESSEE AFTER MIDNIGHT.
STORM DEVELOPMENT TODAY HAS BEEN LIMITED DUE TO CAP ALOFT. BELIEVE
CAP HAS STRENGTHENED DURING THE DAY AS VAD WIND PROFILE HAS SHOWN
A UNIDIRECTIONAL WEST WIND MUCH OF THE DAY ALLOWING FOR WARM
ADVECTION THROUGH THE MID LEVELS. MUCH DRIER AIR MASS CURRENTLY
ADVECTING ACROSS CENTRAL PLAINS AND ACROSS MIDDLE MISSISSIPPI
VALLEY AND TOWARD OHIO AND TENNESSEE VALLEYS. BELIEVE MID STATE IS
ON EDGE OF LID. COULD SEE STORMS EXPLODE TO OUR WEST IF CAP
BREAKS. MID STATE IN NORTHWEST FLOW ALOFT SO EVENING SHIFT WILL
NEED TO WATCH SITUATION CLOSELY.

FRONTAL BOUNDARY SLIPS THROUGH MID STATE LATE TONIGHT AND EARLY SUNDAY.
WILL KEEP A SHOWER/TSTM CHANCE GOING MAINLY FOR THE MORNING ON SUNDAY.
UPCOMING WORK WEEK LOOKS DRY WITH TEMPS GENERALLY IN THE LOW TO
MIDDLE 90S WITH MID AND UPPER 80S ON PLATEAU.

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      74  93  70  91 /  50  20  10  10
CLARKSVILLE    71  92  67  91 /  50  10  10  10
CROSSVILLE     69  88  65  86 /  60  40  10  10
COLUMBIA       74  94  71  92 /  50  30  10  10
LAWRENCEBURG   73  94  70  93 /  60  30  10  10
WAVERLY        72  93  69  92 /  50  10  10  10

&&

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

BOYD

Hazardous weather outlook, Aug 21, 9:08 AM CDT, 10 hours 22 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
908 AM CDT SAT AUG 21 2010

TNZ005>011-022>034-056>066-075-077>080-093>095-221415-
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-
908 AM CDT SAT AUG 21 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

THERE IS A LIKELIHOOD FOR LOCALLY HEAVY RAINFALL TODAY AND TONIGHT
ACROSS THE MID STATE...INCLUDING THOSE AREAS THAT WERE HIT HARDEST
BY THE HEAVY RAINS LAST TUESDAY THROUGH THURSDAY. A LOOK AT THE
ATMOSPHERE THIS MORNING SHOWED A VERY MOIST ENVIRONMENT...AND THE
POTENTIAL FOR SOME AREAS TO RECEIVE AS MUCH AS TWO INCHES OF RAIN
OR MORE...IN A SHORT PERIOD OF TIME... DURING THUNDERSTORMS TODAY
AND TONIGHT. THIS WILL LEAD TO RAPID RUN OFF AND THE LIKELIHOOD
OF PONDING OF WATER...AND POSSIBLY FLASH FLOODING.

STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLY TODAY AND TONIGHT
AS WELL. STRONG DAMAGING STRAIGHT LINE WINDS WILL LIKELY BE THE
BIGGEST THREAT FROM THESE STORMS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

SOME THUNDERSTORMS...WITH LOCALLY HEAVY RAINS...WILL LINGER OVER
SOUTHERN AND EASTERN SECTIONS OF THE MID STATE ON SUNDAY...ALONG WITH A
CONTINUED POTENTIAL FOR PONDING OF WATER IN LOW LYING...POORLY
DRAINED...AREAS.

.SPOTTER INFORMATION STATEMENT...

REPORTS FROM TRAINED WEATHER SPOTTERS MAY BE NEEDED.

SPOTTER THUNDERSTORM REPORTING CRITERIA...
TORNADO
FUNNEL CLOUD
FLOODING
HAIL >= 1/2 INCH
WINDS > 50 MPH (MEASURED)
STRUCTURAL DAMAGE
TREES OR POWER LINES DOWN

19

In the hours before

Local storm report, Aug 21, 5:32 PM CDT, 1 hour 58 minutes before

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Local storm report, Aug 21, 5:35 PM CDT, 1 hour 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
535 PM CDT SAT AUG 21 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0520 PM     FLASH FLOOD      WHITE BLUFF             36.11N 87.21W
08/21/2010                   DICKSON            TN   LAW ENFORCEMENT

            WATER COVERED ROADS. UNKNOWN DEPTH.

&&

04

Local storm report, Aug 21, 5:58 PM CDT, 1 hour 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
558 PM CDT SAT AUG 21 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0523 PM     TSTM WND DMG     3 NW MURFREESBORO       35.88N 86.43W
08/21/2010                   RUTHERFORD         TN   LAW ENFORCEMENT

            S.O. REPORTS A TREE BLOWN DOWN ON LEANNA ROAD IN
            NORTHWEST MURFREESBORO.

&&

JLM

Local storm report, Aug 21, 6:01 PM CDT, 1 hour 29 minutes before

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Local storm report, Aug 21, 6:33 PM CDT, 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
633 PM CDT SAT AUG 21 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0625 PM     FUNNEL CLOUD     MANCHESTER              35.47N 86.08W
08/21/2010                   COFFEE             TN   TRAINED SPOTTER

            SPOTTER REPORTED A POSSIBLE FUNNEL CLOUD NEAR THE WALMART
            IN MANCHESTER.

&&

JLM

Local storm report, Aug 21, 6:48 PM CDT, 42 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
Aug 21, 7:58 PM CDT	Severe Thunderstorm Warning	OHX	Macon	32 min
Aug 21, 8:19 PM CDT	Severe Thunderstorm Warning	OHX	Maury	26 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2010 Every severe thunderstorm warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.