Alert archive / Mississippi / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 189, NWS Memphis, TN

August 21, 2005Lafayette County, Mississippi

NWS Memphis, TN issued this severe thunderstorm warning at Aug 21, 2005, 3:14 PM CDT for Lafayette County, Mississippi. It was in force for 31 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, 2005, 3:14 PM CDT (20:14 UTC)
Expired
Aug 21, 2005, 3:45 PM CDT
In force
31 min
Issued by
NWS Memphis, TN
Area
Counties, with a storm outline in the text

County Lafayette County, MS

The radar

The Memphis radar (KNQA), 115 km from the middle of the area, began a volume at 20:13 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

Jackson, MS (KJAN), launched 12:00Z, 8.2 hours before the alert went out and 233 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, Jackson, MS at 12:00Z on 2005-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1741 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, Jackson, MS at 12:00Z on 2005-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 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
1741 J/kg
Mixed-layer CIN
-65 J/kg
Mixed-layer LCL
1294 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
48 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 21, 10:42 AM CDT, 4 hours 32 minutes earlier.

Area forecast discussion, Aug 21, 10:42 AM CDT, 4 hours 32 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEMPHIS TN
1042 AM CDT SUN AUG 21 2005

.DISCUSSION...

WEAK HIGH PRESSURE REMAINS IN PLACE OVER THE MID-SOUTH THIS
MORNING AND THIS HAS ALLOWED TEMPERATURES TO WARM AT A PACE SIMILAR
TO YESTERDAY ACROSS THE SOUTHERN TWO-THIRDS OF THE AREA.
TEMPERATURES ARE A FEW DEGREES COOLER ACROSS NORTHERN TIER
COUNTIES. SURFACE DEWPOINTS ARE ALSO HIGHER AREAWIDE THIS MORNING AS
COMPARED TO YESTERDAY.

IN THE UPPER LEVELS...A VERY WEAK SHORTWAVE TROUGH WAS NOTED ON
REGIONAL WATER VAPOR IMAGERY MOVING ACROSS EASTERN ARKANSAS INTO
WEST TENNESSEE AND NORTH MISSISSIPPI THIS MORNING. ALSO...VISIBLE
SATELLITE IMAGERY SHOWING CONVECTIVE CLOUD COVER OVER THESE AREAS
IN RESPONSE TO THIS FEATURE. DUE TO THE SUBTLE NATURE OF THIS SYSTEM
AND NO SIGNIFICANT LOW LEVEL FEATURES PRESENT TO FOCUS CONVECTION...
THINK THAT CURRENT FORECAST OF LOW END CHANCE POPS LOOKS GOOD.
SHOULD SEE A BIT OF AN INCREASE IN SCATTERED THUNDERSTORM COVERAGE
LATER TODAY...AS REGIONAL 12Z SOUNDINGS SHOW A MOIST AND UNCAPPED
ENVIRONMENT...AND CONTINUED DAYTIME HEATING SHOULD LEAD TO
INCREASINGLY UNSTABLE CONDITIONS.

SINCE TEMPERATURES AND HUMIDITY LEVELS ARE ON TRACK TO PRODUCE HEAT
INDICES BETWEEN 105-110 DEGREES ACROSS MOST OF THE MID-SOUTH AGAIN
THIS AFTERNOON...HAVE DECIDED TO EXPAND THE CURRENT HEAT ADVISORY
FURTHER NORTH TO INCLUDE ALL BUT OUR FAR NORTHERN TIER COUNTIES. IN
ADDITION...DUE TO THE SCATTERED NATURE OF ANY CONVECTION THAT
DEVELOPS...THIS SHOULD NOT HINDER HEATING ACROSS MOST OF THE
ADVISORY AREA.

UPDATED ZONES...GRIDS...AND HEADLINES OUT SHORTLY.

&&

.MEG WATCHES/WARNINGS/ADVISORIES
AR...HEAT ADVISORY EXPANDED TO INCLUDE ALL OF EAST CENTRAL
     ARKANSAS...TO THE SOUTH OF A JONESBORO TO BLYTHEVILLE LINE
     THROUGH 7PM SUNDAY.
MO...NONE.
MS...HEAT ADVISORY EXPANDED TO INCLUDE ALL OF NORTH MISSISSIPPI
     THROUGH 7PM SUNDAY.
TN...HEAT ADVISORY EXPANDED TO INCLUDE ALL OF WEST TENNESSEE...TO THE
     SOUTH OF A DYERSBURG TO HUNTINGDON LINE THROUGH 7PM SUNDAY.

JLH
Hazardous weather outlook, Aug 21, 3:00 AM CDT, 12 hours 14 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MEMPHIS TN
300 AM CDT SUN AUG 21 2005

ARZ008-009-017-018-026>028-035-036-048-049-058-MOZ113-115-MSZ001>017-
020>024-TNZ001>004-019>021-048>055-088>092-221000-
ALCORN-BENTON-CALHOUN-CARROLL-CHESTER-CHICKASAW-CLAY-COAHOMA-
CRAIGHEAD-CRITTENDEN-CROCKETT-CROSS-DECATUR-DESOTO-DUNKLIN-DYER-
FAYETTE-GIBSON-GREENE-HARDEMAN-HARDIN-HAYWOOD-HENDERSON-HENRY-
ITAWAMBA-LAFAYETTE-LAKE-LAUDERDALE-LAWRENCE-LEE(AR)-LEE(MS)-MADISON-
MARSHALL-MCNAIRY-MISSISSIPPI-MONROE-OBION-PANOLA-PEMISCOT-PHILLIPS-
POINSETT-PONTOTOC-PRENTISS-QUITMAN-RANDOLPH-SHELBY-ST. FRANCIS-
TALLAHATCHIE-TATE-TIPPAH-TIPTON-TISHOMINGO-TUNICA-UNION-WEAKLEY-
YALOBUSHA-
300 AM CDT SUN AUG 21 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST ARKANSAS...NORTH
MISSISSIPPI...WEST TENNESSEE AND THE MISSOURI BOOTHEEL.

.DAY ONE...

A HEAT ADVISORY WILL CONTINUE ACROSS THE SOUTHERN HALF OF THE
MID-SOUTH WITH HEAT INDICES REACHING 105 TO 111 DEGREES. THE ELDERLY
AND THOSE WITH HEALTH PROBLEMS SHOULD REMAIN IN AN AIR CONDITIONED
AREAS. IF OUTDOOR ACTIVITIES ARE PLANNED...TAKE FREQUENT BREAKS AND
DRINK PLENTY OF WATER.

A PRE-FRONTAL TROUGH OF LOW PRESSURE IS IN THE MID-SOUTH AND IT WILL
TRIGGER SCATTERED THUNDERSTORMS ACROSS THE NORTHERN HALF OF THE AREA
TODAY AND THIS EVENING. THE ATMOSPHERE WILL REMAIN UNSTABLE AND A
FEW THUNDERSTORMS COULD APPROACH SEVERE LIMITS...WITH STRONG AND
GUSTY WINDS POSSIBLE. ANY SEVERE THREAT SHOULD REMAIN LIMITED AND
END LATER THIS EVENING WITH THE LOSS OF DAYTIME HEATING.

.DAYS TWO THROUGH SEVEN...

THE PRE-FRONTAL TROUGH WILL TRIGGER ADDITIONAL SCATTERED
THUNDERSTORMS MONDAY. THE ATMOSPHERE WILL ONCE AGAIN BECOME UNSTABLE AND A
FEW THUNDERSTORMS COULD AGAIN APPROACH SEVERE LIMITS...WITH STRONG
AND GUSTY WINDS POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION FOR WIDESPREAD SEVERE WEATHER IS NOT ANTICIPATED
AT THIS TIME.

JLH/WER

In the hours before

Local storm report, Aug 21, 3:03 PM CDT, 11 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 2:39 PM CDTSevere Thunderstorm WarningMEGChickasaw36 min
Aug 21, 3:42 PM CDTSevere Thunderstorm WarningMEGYalobusha33 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2005Every severe thunderstorm warning in 2005

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.