Alert archive / Tennessee / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 397, NWS Memphis, TN

August 5, 2009Dyer County, Lauderdale County, Tennessee; Mississippi County, Arkansas

NWS Memphis, TN issued this severe thunderstorm warning at Aug 5, 2009, 12:02 AM CDT for Dyer County, Lauderdale County, Tennessee; Mississippi County, Arkansas. It was in force for 30 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 5, 2009, 12:02 AM CDT (05:02 UTC)
Expired: Aug 5, 2009, 12:32 AM CDT
In force: 30 min
Issued by: NWS Memphis, TN
Area: Storm-based polygon

Counties Mississippi County, AR, Dyer County, TN, Lauderdale County, TN

The radar

The Memphis radar (KNQA), 60 km from the middle of the area, began a volume at 05:04 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 4, 11:11 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 5.0 hours before the alert went out and 117 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: 2116 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 1606 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Memphis, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 4, 8:13 PM CDT, 3 hours 49 minutes earlier.

Area forecast discussion, Aug 4, 8:13 PM CDT, 3 hours 49 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEMPHIS TN
813 PM CDT TUE AUG 4 2009

.DISCUSSION...

HUGE SQUALL LINE MOVING THROUGH MIDDLE TENNESSEE AND EXTENDING
INTO NORTHWEST TENNESSEE. THIS LINE WILL CONTINUE TO MOVE SOUTH TO
SOUTHEAST AFFECTING MANY AREAS ALONG THE TENNESSEE RIVER. OVER THE
PAST TWO HOURS...ADDITIONAL STRONG TO SEVERE THUNDERSTORMS WERE
DEVELOPING NORTHWEST OF THE MAIN LINE ABOUT 75 MILES SOUTH OF STL.

THE SEVERE THUNDERSTORM WATCH WILL CONTINUE UNTIL 11 PM AND MAY
NEED TO BE EXTENDED DEPENDING ON THE EVOLUTION OF THE
AFOREMENTIONED STORMS SOUTH OF STL. THE SAME AREAS CURRENTLY
EXPERIENCING HEAVY RAIN WILL LIKELY SEE ADDITIONAL HEAVY RAIN AND
POSSIBLE FLOODING. FLASH FLOODING AND STRAIGHT-LINE WINDS WILL BE
THE MAIN PROBLEMS WITH STORMS OVER THE REMAINDER OF THE NIGHT.

WILL RAISE OVERNIGHT TEMPERATURES FOR MUCH OF THE MIDSOUTH DUE TO
ABUNDANT LOW LEVEL MOISTURE REMAINING IN PLACE. COOLEST
TEMPERATURES WILL OCCUR DURING OR SHORTLY AFTER SHOWERS MOVE OVER
A PARTICULAR AREA...AND BE SHORT LIVED.

AC

&&

.PREV DISCUSSION... /ISSUED 348 PM CDT TUE AUG 4 2009/

DISCUSSION...
REMNANTS OF THIS MORNING/S MCS OVER IL/IN HAVE DROPPED INTO KY AND
EASTERN TN AT DISCUSSION TIME. SCATTERED THUNDERSTORMS EXTENDED
WEST OF THE MCS THROUGH CENTRAL AND SOUTHERN MO. THIS SCATTERED
LINE OF STORMS APPEARED HAVE FORMED ALONG A WEAK BAROCLINIC
ZONE... WHILE A MORE PRONOUNCED SURFACE COLD FRONT WAS SLOWLY
DROPPING SOUTH THROUGH IA AND EASTERN NE. NOT CONFIDENT THAT
THESE STORMS WILL PERSIST INTO THE NIGHTTIME...PARTICULARLY WEST OF
THE MS RIVER. HAVE KEPT POPS DOWN INTO THE 20S/30S AT MEMPHIS AT
JACKSON.

ONE MORE POTENTIAL ROUND OF SCATTERED THUNDERSTORMS WEDNESDAY
NIGHT / EARLY THURSDAY... BEFORE THE SOUTHERN PLAINS UPPER LEVEL
RIDGE EXTENDS ITS REACH INTO THE LOWER MS RIVER VALLEY. HEAT
INDICES WILL LIKELY REACH 105 AT MEMPHIS AND THE EASTERN AR/NORTHWEST
MS DELTA WEDNESDAY AFTERNOON. HAVE INCLUDED EXCESSIVE HEAT MENTION
IN THE HAZARDOUS WEATHER OUTLOOK. MIDSHIFT WILL LIKELY NEED TO
ISSUE HEAT ADVISORY HEADLINES FOR AT LEAST A PORTION OF THE
MIDSOUTH FOR WEDNESDAY. GFS/NAM MOS HAVE YET TO KEY IN ON THE
SIGNIFICANT EVAPOTRANSPIRATION FOLLOWING THE RECENT RAINS.

FOR THURSDAY AND FRIDAY...THE 12Z GFS KEEPS THE MIDSOUTH BETWEEN
THE SEA BREEZE STORMS ALONG THE GULF COAST AND THE NORTHWEST FLOW
THUNDERSTORMS IN THE UPPER MIDWEST. WHAT REMAINS FOR THE MIDSOUTH
IS HOT HUMID AND MOSTLY SUNNY CONDITIONS. MAY SEE ISOLATED
AFTERNOON THUNDERSTORMS RETURN LATE WEEKEND/EARLY NEXT WEEK... AS
THE UPPER RIDGE CENTER LIFTS EAST TO THE CAROLINAS.

PWB

&&

.AVIATION...

00Z TAF CYCLE

PRIMARY FORECAST CONCERN FOR THIS EVENING WILL BE SEVERE MCS
TRACKING SOUTHEAST OUT OF WESTERN KENTUCKY INTO PORTIONS OF
NORTHWEST TENNESSEE. AIRMASS REMAINS AT LEAST MODERATELY UNSTABLE
TO THE SOUTH OF THIS COMPLEX...YET LARGE SCALE SUBSIDENCE APPEARS
STRONG JUST TO THE WEST OF THIS COMPLEX. SO THERE STILL REMAINS
UNCERTAINTY WITH HOW FAR WEST THIS COMPLEX WILL BACKBUILD. DECIDED
TO INCLUDE TEMPO FOR A COUPLE OF HOURS AT MKL FOR +TSRA ALONG WITH
OCCASIONAL IFR/MVFR CEILINGS/VISBYS AND STRONG WIND GUST
POTENTIAL. OTHERWISE THUNDERSTORM POTENTIAL TOO LOW AT ALL OTHER
SITES TO INCLUDE TEMPOS...AND HAVE MAINTAINED VFR CONDITIONS AND
LIGHT SOUTH WINDS.

VFR CONDITIONS WILL PREVAIL TOMORROW MORNING WITH PERIODS OF MVFR
POSSIBLE BY AFTERNOON WITH ADDITIONAL CHANCES FOR SHOWERS AND
THUNDERSTORMS.

JLH

&&

.PRELIMINARY POINT TEMPS/POPS...
MEM  75  94  76  95 /  30  30  10  10
MKL  72  92  70  92 /  50  30  10  10
JBR  73  93  73  94 /  40  30  10  10
TUP  73  94  71  93 /  20  30  20  20

&&

.MEG WATCHES/WARNINGS/ADVISORIES...
AR...NONE.
MO...NONE.
MS...NONE.
TN...NONE.
&&

Hazardous weather outlook, Aug 4, 11:25 PM CDT, 37 minutes before

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In the hours before

Local storm report, Aug 4, 8:05 PM CDT, 3 hours 57 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE MEMPHIS TN
805 PM CDT TUE AUG 04 2009

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

0729 PM     HAIL             PURYEAR                 36.44N 88.33W
08/04/2009  E0.75 INCH       HENRY              TN   PUBLIC

0751 PM     TSTM WND DMG     PARIS                   36.30N 88.31W
08/04/2009                   HENRY              TN   LAW ENFORCEMENT

            SEVERAL LARGE TREES AND POWER POLES DOWN IN THE CITY OF
            PARIS

&&

DSV

Local storm report, Aug 4, 8:16 PM CDT, 3 hours 46 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MEMPHIS TN
816 PM CDT TUE AUG 04 2009

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

0729 PM     HAIL             PURYEAR                 36.44N 88.33W
08/04/2009  E0.75 INCH       HENRY              TN   PUBLIC

0751 PM     TSTM WND DMG     PARIS                   36.30N 88.31W
08/04/2009                   HENRY              TN   LAW ENFORCEMENT

            SEVERAL LARGE TREES AND POWER POLES DOWN IN THE CITY OF
            PARIS

0759 PM     TSTM WND GST     7 ESE HENRY             36.16N 88.29W
08/04/2009  E60.00 MPH       HENRY              TN   TRAINED SPOTTER

0804 PM     TSTM WND DMG     MCKENZIE                36.14N 88.51W
08/04/2009                   CARROLL            TN   EMERGENCY MNGR

            TREES AND POWER LINES DOWN

0810 PM     TSTM WND DMG     HUNTINGDON              36.01N 88.41W
08/04/2009                   CARROLL            TN   EMERGENCY MNGR

            TREES AND POWER LINES DOWN

&&

DSV

Local storm report, Aug 4, 9:11 PM CDT, 2 hours 51 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MEMPHIS TN
911 PM CDT TUE AUG 04 2009

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

0729 PM     HAIL             PURYEAR                 36.44N 88.33W
08/04/2009  E0.75 INCH       HENRY              TN   PUBLIC

0751 PM     TSTM WND DMG     PARIS                   36.30N 88.31W
08/04/2009                   HENRY              TN   LAW ENFORCEMENT

            SEVERAL LARGE TREES AND POWER POLES DOWN IN THE CITY OF
            PARIS

0759 PM     TSTM WND GST     7 ESE HENRY             36.16N 88.29W
08/04/2009  E60.00 MPH       HENRY              TN   TRAINED SPOTTER

0804 PM     TSTM WND DMG     MCKENZIE                36.14N 88.51W
08/04/2009                   CARROLL            TN   EMERGENCY MNGR

            TREES AND POWER LINES DOWN

0810 PM     TSTM WND DMG     HUNTINGDON              36.01N 88.41W
08/04/2009                   CARROLL            TN   EMERGENCY MNGR

            TREES AND POWER LINES DOWN

0840 PM     TSTM WND GST     10 NNE PARSONS          35.79N 88.06W
08/04/2009  E60.00 MPH       DECATUR            TN   PUBLIC

            BLEW 2 LARGE TRASH BINS END OVER END ACROSS PARKING LOT
            AT GAS STATION IN SUGAR TREE TENNESSEE

&&

DSV

Special weather statement, Aug 4, 9:14 PM CDT, 2 hours 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEMPHIS TN
914 PM CDT TUE AUG 4 2009

TNZ001>004-050300-
HENRY TN-WEAKLEY TN-LAKE TN-OBION TN-
914 PM CDT TUE AUG 4 2009

...THIS SIGNIFICANT WEATHER ALERT IS FOR...

  HENRY COUNTY IN NORTHWEST TENNESSEE...
  EXTREME NORTHEASTERN LAKE COUNTY IN NORTHWEST TENNESSEE...
  OBION COUNTY IN NORTHWEST TENNESSEE...
  WEAKLEY COUNTY IN NORTHWEST TENNESSEE...

A LINE OF STRONG THUNDERSTORMS PRODUCING 40 TO 50 MPH WINDS WAS
LOCATED FROM 19 MILES NORTHWEST OF PARIS LANDING STATE PARK TO 4
MILES SOUTHEAST OF CLAYTON AT 915 PM CDT...MOVING SOUTHEAST AT 50
MPH.

PEOPLE IN HENRY...LAKE...OBION AND WEAKLEY COUNTIES...INCLUDING
LOCATIONS NEAR MARTIN...PARIS LANDING STATE PARK...PARIS AND UNION
CITY...SHOULD MONITOR THIS STORM CLOSELY THIS SIGNIFICANT WEATHER
ALERT IS IN EFFECT UNTIL 1000 PM CDT.

.A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT FOR THE ALERT
AREA.

Local storm report, Aug 4, 11:16 PM CDT, 46 minutes before

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Local storm report, Aug 4, 11:30 PM CDT, 32 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 3:19 AM CDT	Severe Thunderstorm Warning	MEG	Tunica	56 min
Aug 4, 7:03 PM CDT	Severe Thunderstorm Warning	MEG	Henry, Obion, Weakley	42 min
Aug 4, 7:06 PM CDT	Flash Flood Warning	MEG	Henry, Obion, Weakley	3 hr
Aug 4, 7:34 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Henry, Weakley	41 min
Aug 4, 7:38 PM CDT	Flash Flood Warning	MEG	Carroll, Henry, Weakley	3 hr
Aug 4, 7:43 PM CDT	Severe Thunderstorm Warning	MEG	Henry, Weakley	47 min
Aug 4, 8:09 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Decatur, Henderson	66 min
Aug 4, 9:34 PM CDT	Severe Thunderstorm Warning	MEG	Lake, Obion	56 min
Aug 4, 9:38 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Gibson, Henry, Obion, Weakley	67 min
Aug 4, 10:05 PM CDT	Tornado Warning	MEG	Carroll, Gibson, Obion, Weakley	22 min
Aug 4, 10:10 PM CDT	Flash Flood Warning	MEG	Carroll, Decatur, Gibson, Henry, Lake, Obion and 1 more	3 hr
Aug 4, 10:14 PM CDT	Tornado Warning	MEG	Carroll, Henderson	46 min
Aug 4, 10:16 PM CDT	Severe Thunderstorm Warning	MEG	Dyer, Lake	44 min
Aug 4, 10:39 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Decatur, Henderson	51 min
Aug 4, 11:00 PM CDT	Severe Thunderstorm Warning	MEG	Dyer, Lake	45 min
Aug 4, 11:12 PM CDT	Severe Thunderstorm Warning	MEG	Clay	63 min
Aug 4, 11:32 PM CDT	Severe Thunderstorm Warning	MEG	Clay, Greene, Randolph	43 min
Aug 4, 11:56 PM CDT	Severe Thunderstorm Warning	MEG	Mississippi	37 min
Aug 5, 12:41 AM CDT	Flash Flood Warning	MEG	Clay, Greene, Randolph	3 hr
Aug 5, 12:49 AM CDT	Severe Thunderstorm Warning	MEG	Clay, Randolph	41 min
Aug 5, 2:05 AM CDT	Flash Flood Warning	MEG	Craighead, Lawrence, Poinsett	3 hr
Aug 5, 2:47 AM CDT	Severe Thunderstorm Warning	MEG	Crittenden, Cross, Mississippi, Poinsett, St. Francis	43 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2009 Severe Thunderstorm Warnings in Arkansas, 2009 Every severe thunderstorm warning 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.