Alert archive / Mississippi / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 24, NWS New Orleans, LA

April 21, 2006Jackson County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Apr 21, 2006, 3:20 PM CDT for Jackson County, Mississippi. It was in force for 55 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
Apr 21, 2006, 3:20 PM CDT (20:20 UTC)
Expired
Apr 21, 2006, 4:15 PM CDT
In force
55 min
Issued by
NWS New Orleans, LA
Area
Counties, with a storm outline in the text

County Jackson County, MS

The radar

The Mobile radar (KMOB), 44 km from the middle of the area, began a volume at 20:19 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.

IssuedProductOfficeLasted
Apr 21, 1:24 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.3 hours before the alert went out and 106 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, Slidell Radar S, LA at 12:00Z on 2006-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1172 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, Slidell Radar S, LA at 12:00Z on 2006-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 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
1172 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
699 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
55 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.7

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 New Orleans, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 21, 2:05 PM CDT, 1 hour 15 minutes earlier.

Area forecast discussion, Apr 21, 2:05 PM CDT, 1 hour 15 minutes before
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE NEW ORLEANS LA
205 PM CDT FRI APR 21 2006

.UPDATE...
DID A QUICK UPDATE FOR NEW WATCH AND PORTIONS OF OLD WATCH THAT
HAVE EXPIRED. ALSO UPDATED POPS AND WEATHER TO ACCOUNT FOR CURRENT
TRENDS WHICH MOVE OUT ALL MEASURABLE RAIN OUT OF OUR LAND BASED
FORECAST AREA WELL BEFORE 7 PM.

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...NONE.
GM...NONE.
MS...NONE.
GM...NONE.
&&

22
Hazardous weather outlook, Apr 21, 11:48 AM CDT, 3 hours 32 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1148 AM CDT FRI APR 21 2006

LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-212300-
AMITE-ASCENSION-ASSUMPTION-EAST BATON ROUGE-EAST FELICIANA-HANCOCK-
HARRISON-IBERVILLE-JACKSON-LIVINGSTON-LOWER JEFFERSON-
LOWER LAFOURCHE-LOWER PLAQUEMINES-LOWER ST BERNARD-LOWER TERREBONNE-
ORLEANS-PEARL RIVER-PIKE-POINTE COUPEE-ST CHARLES-ST HELENA-ST JAMES-
ST JOHN THE BAPTIST-ST TAMMANY-TANGIPAHOA-UPPER JEFFERSON-
UPPER LAFOURCHE-UPPER PLAQUEMINES-UPPER ST BERNARD-UPPER TERREBONNE-
WALTHALL-WASHINGTON-WEST BATON ROUGE-WEST FELICIANA-WILKINSON-
1120 AM CDT FRI APR 21 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST
LOUISIANA AND SOUTHERN MISSISSIPPI.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS TODAY. STRONG TO
LOCALLY SEVERE THUNDERSTORMS WILL MOVE ACROSS MOST OF EAST CENTRAL
AND SOUTHEAST LOUISIANA AND SOUTH MISSISSIPPI THROUGH EARLY
EVENING. THE MAIN THREATS FROM SEVERE THUNDERSTORMS WILL BE DAMAGING
STRAIGHT LINE WINDS AND FREQUENT LIGHTNING. A FEW OF THE STRONGEST
STORMS COULD PRODUCE LARGE HAIL.

A COLD FRONT WILL MOVE ACROSS THE AREA AND END THE THREAT OF SEVERE
WEATHER FROM WEST TO EAST DURING THE MID AFTERNOON TO EARLY EVENING
HOURS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS REQUESTED FOR THIS AFTERNOON. A SEVERE
THUNDERSTORM WATCH IS IN EFFECT FOR SOUTHEAST LOUISIANA AND MUCH OF
SOUTHERN MISSISSIPPI THROUGH 4 PM CDT. FIRST RESPONDERS AND STORM
SPOTTERS ARE URGED TO CLOSELY MONITOR THE WEATHER AND CALL IN ANY
SEVERE STORM REPORTS INTO THE NATIONAL WEATHER SERVICE OFFICE IN
SLIDELL LOUISIANA. THE PUBLIC SHOULD RELAY ANY REPORTS INTO THEIR
LOCAL LAW ENFORCEMENT AGENCY FOR RELAY TO THE NATIONAL WEATHER
SERVICE. PERSONS CAN ALSO ENTER STORM REPORTS ON OUR WEBSITE AT
WWW.SRH.NOAA.GOV/LIX (ALL LOWER CASE).

24

In the hours before

Special weather statement, Apr 21, 12:18 PM CDT, 3 hours 2 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1218 PM CDT FRI APR 21 2006

LAZ035>038-046>050-056>060-065>067-MSZ068>070-211800-
AMITE MS-ASCENSION LA-ASSUMPTION LA-EAST BATON ROUGE LA-
EAST FELICIANA LA-IBERVILLE LA-LIVINGSTON LA-LOWER LAFOURCHE LA-
LOWER TERREBONNE LA-PIKE MS-ST. CHARLES LA-ST. HELENA LA-
ST. JAMES LA-ST. JOHN THE BAPTIST LA-TANGIPAHOA LA-
UPPER LAFOURCHE LA-UPPER TERREBONNE LA-WEST BATON ROUGE LA-
WEST FELICIANA LA-WILKINSON MS-
1218 PM CDT FRI APR 21 2006

...STRONG THUNDERSTORMS MOVING INTO SOUTHEAST LOUISIANA...
...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 4 PM CDT...

AT 1215 PM CDT...DOPPLER RADAR INDICATED A LINE OF THUNDERSTORMS
EXTENDING FROM CENTRAL WILKINSON COUNTY MISSISSIPPI TO MARINGOUIN TO
NEAR MORGAN CITY...MOVING EAST AT 35 MPH. SHOWERS AND THUNDERSTORMS
WERE ALSO DEVELOPING IN SCATTERED COVERAGE WELL EAST OF THE LINE.

EXPECT WIND GUSTS OF 35 TO 50 MPH AND OCCASIONAL LIGHTNING FROM
THESE STORMS AS THEY MOVE ACROSS EXTREME SOUTHWEST MISSISSIPPI AND
EAST-CENTRAL LOUISIANA THROUGH 1 PM. A FEW OF THE STRONGER STORMS
MAY BECOME LOCALLY SEVERE THIS AFTERNOON...PRIMARILY WITH A THREAT
OF DAMAGING WINDS.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO OR TELEVISION
STATIONS...OR YOUR CABLE TELEVISION PROVIDER FOR FURTHER DETAILS OR
UPDATES.

24
Local storm report, Apr 21, 12:38 PM CDT, 2 hours 42 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1238 PM CDT FRI APR 21 2006

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

1234 PM     HAIL             6 W COVINGTON           30.48N 90.21W
04/21/2006  E0.25 INCH       ST. TAMMANY        LA   PUBLIC

            ALSO SMALL LIMBS BLOWN DOWN BY ESTIMATED 40-50 MPH WIND
            GUSTS. REPORTED IN GOODBEE.

&&

RICKS
Local storm report, Apr 21, 12:53 PM CDT, 2 hours 27 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1253 PM CDT FRI APR 21 2006

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

1251 PM     HAIL             5 W COVINGTON           30.48N 90.20W
04/21/2006  E0.50 INCH       ST. TAMMANY        LA   NWS EMPLOYEE

            GOODBEE AT I-12 AND HWY 1077 EXIT.

&&

RICKS
Special weather statement, Apr 21, 1:59 PM CDT, 1 hour 21 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
159 PM CDT FRI APR 21 2006

MSZ077-080>082-212000-
HANCOCK MS-HARRISON MS-JACKSON MS-PEARL RIVER MS-
159 PM CDT FRI APR 21 2006

...STRONG STORMS TO MOVE ACROSS SOUTH MISSISSIPPI...
...SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR HANCOCK COUNTY UNTIL 4
   PM CDT...HARRISON AND JACKSON COUNTIES UNTIL 9 PM CDT...

A LARGE CLUSTER OF THUNDERSTORMS EXTENDED FROM POPLARVILLE TO NEAR
SLIDELL AT 158 PM...MOVING EAST AT AROUND 30 MPH. FREQUENT
LIGHTNING...WIND GUSTS OF 35 TO 45 MPH AND BRIEF HEAVY RAINFALL CAN
BE EXPECTED WITH THESE STORMS. ONE OR TWO MAY BECOME BRIEFLY SEVERE
WITH DAMAGING WINDS AND SMALL HAIL THROUGH 3 PM.

THESE STORMS SHOULD BE IN BAY ST LOUIS AREA AROUND 220 PM...GULFPORT
BY 250 PM AND BILOXI AND OCEAN SPRINGS AROUND 3 PM.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO OR TELEVISION
STATIONS...OR YOUR CABLE TELEVISION PROVIDER FOR FURTHER DETAILS OR
UPDATES.

24
Local storm report, Apr 21, 2:42 PM CDT, 38 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
242 PM CDT FRI APR 21 2006

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

1221 PM     MARINE TSTM WIND 12 SSW MANDEVILLE       30.21N 90.16W
04/21/2006  M44 MPH          GMZ530             LA   OFFICIAL NWS OBS

            MEASURED AT MID-LAKE MDLL1 ON THE OLD CAUSEWAY
            TURN-AROUND.

1242 PM     MARINE TSTM WIND MANDEVILLE              30.37N 90.08W
04/21/2006  M53 MPH          ST. TAMMANY        LA   OFFICIAL NWS OBS

            TIME ESTIMATED BUT OCCURRED BETWEEN 1243 AND 142 PM CDT.
            RECORDED AT MANDEVILLE MDVL1 AT CAUSEWAY TOLL PLAZA.

&&

RICKS
Local storm report, Apr 21, 3:07 PM CDT, 13 minutes before
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The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 21, 12:06 PM CDTSpecial Marine WarningLIX24 min
Apr 21, 12:40 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa50 min
Apr 21, 12:59 PM CDTSpecial Marine WarningLIX2 hr
Apr 21, 1:15 PM CDTTornado WarningLIXSaint Tammany18 min
Apr 21, 3:25 PM CDTSpecial Marine WarningLIX95 min
Apr 21, 4:57 PM CDTSpecial Marine WarningLIX63 min
Apr 21, 6:00 PM CDTSpecial Marine WarningLIX60 min
Apr 21, 6:56 PM CDTSpecial Marine WarningLIX64 min
Apr 21, 2:49 PM CDTSevere Thunderstorm WarningLIXHarrison41 min
Apr 21, 4:03 PM CDTSevere Thunderstorm WarningLIXHarrison27 min
Apr 21, 4:15 PM CDTSevere Thunderstorm WarningLIXJackson30 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2006Every severe thunderstorm warning in 2006

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.