Alert archive / Mississippi / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 83, NWS New Orleans, LA

April 11, 2005Hancock County, Harrison County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Apr 11, 2005, 10:18 PM CDT for Hancock County, Harrison County, Mississippi. It was in force for 42 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: Apr 11, 2005, 10:18 PM CDT (03:18 UTC)
Expired: Apr 11, 2005, 11:00 PM CDT
In force: 42 min
Issued by: NWS New Orleans, LA
Area: Counties, with a storm outline in the text

Counties Hancock County, MS, Harrison County, MS

The radar

The Mobile radar (KMOB), 99 km from the middle of the area, began a volume at 03:23 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 11, 6:35 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 3.3 hours before the alert went out and 52 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: 619 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 502 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 192 m²/s²
0-3 km storm-relative helicity: 292 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 10.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS54 KLIX 120320
SVRLIX
MSC045-047-120400-
/O.NEW.KLIX.SV.W.0083.050412T0318Z-050412T0400Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1018 PM CDT MON APR 11 2005

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  HANCOCK COUNTY IN SOUTHERN MISSISSIPPI
  THIS INCLUDES THE CITY OF DIAMONDHEAD
  HARRISON COUNTY IN SOUTHERN MISSISSIPPI

* UNTIL 1100 PM CDT

* AT 1013 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM KILN TO 12 MILES SOUTHWEST OF KILN...MOVING EAST AT 40 MPH.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. 
REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR 
NO ADVANCED WARNING.

LAT...LON 3059 8943 3029 8955 3046 8893 3065 8894

$$

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 11, 10:10 PM CDT, 8 minutes earlier.

Area forecast discussion, Apr 11, 10:10 PM CDT, 8 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1010 PM CDT MON APR 11 2005

.UPDATE...
TORNADO WATCH NUMBER 155 CONTINUES UNTIL 11 PM FOR THE MS COAST AND
THE SOUTHEAST LOUISIANA PARISHES SOUTH OF LAKE PONTCHARTRAIN FROM
JEFFERSON PARISH EASTWARD. RADAR SHOWS THE BACK EDGE OF THE RAIN
FROM BOGALUSA TO COVINGTON...TO LAPLACE...TO THIBODAUX. NORTHWEST OF
THIS LINE...HAVE DROPPED THE FLASH FLOOD WATCH. REMAINDER OF AREA
STILL EXPERIENCING RAIN WILL REMAIN IN THE FLASH FLOOD WATCH THROUGH
MOST OF TONIGHT OR UNTIL THE THREAT OF HEAVY RAIN ENDS.

RADAR SHOWS STRONG THUNDERSTORMS ALONG BOWING LINE SEGMENT NEAR THE
HANCOCK/HARRISON BORDER. SOME THREAT OF SEVERE MAY CONTINUE A BIT
PAST 11 PM ALONG THE MS COAST...OTHERWISE...HEAVY RAINFALL AND
LOCALIZED FLOODING WILL BE THE MAIN PROBLEM THE NEXT FEW HOURS.

UPDATED GRIDS TO REFLECT CURRENT RADAR TRENDS.

&&

.MARINE...
SMALL CRAFT ADVISORIES REMAIN IN EFFECT FOR THE COASTAL WATERS BUT
HAVE LOWERED TO SMALL CRAFT EXERCISE CAUTION ON LAKES PONTCHARTRAIN
AND MAUREPAS MAINLY FOR WINDS ASSOCIATED WITH CONVECTION THE NEXT
HOUR OR TWO. OTHERWISE FOR TONIGHT...CONDITIONS WILL IMPROVING BY
DAYBREAK AS WINDS BEHIND THE FRONT WILL NOT BE AS STRONG AS AHEAD OF
IT.

&&

.UPDATED POINT TEMPS/POPS...
MCB  58  78  50  74 /  20   0   0   0
BTR  58  78  50  77 /  20   0   0   0
MSY  64  77  55  78 /  90  00   0   0
GPT  65  79  52  73 /  90  20   0   0

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...FLASH FLOOD WATCH IN EFFECT UNTIL 4 AM CDT TONIGHT FOR THE
     FOLLOWING ZONES...LAZ040-058>070.
MS...FLASH FLOOD WATCH IN EFFECT UNTIL 4 AM CDT TONIGHT FOR THE
     FOLLOWING ZONES...MSZ077-080>082.
SE LA AND MS COASTAL WATERS...SMALL CRAFT ADVISORY KPQL TO
ATCHAFALAYA RIVER OUT 60 NM.

&&

22

Hazardous weather outlook, Apr 11, 7:35 PM CDT, 2 hours 43 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
735 PM CDT MON APR 11 2005

LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-121100-
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-
735 PM CDT MON APR 11 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL AND SOUTHEAST
LOUISIANA AND EXTREME SOUTHWEST...SOUTH CENTRAL AND COASTAL
MISSISSIPPI.

.DAY ONE...TONIGHT

THUNDERSTORMS...
THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS FROM THE BATON
ROUGE AREA AND AREAS NORTHWEST OF LAKE PONTCHARTRAIN NORTHWARD INTO
SOUTHWEST MISSISSIPPI...AND A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR
THE REMAINDER OF THE AREA TONIGHT. A STRONG UPPER LEVEL DISTURBANCE
AND AN ASSOCIATED SURFACE LOW PRESSURE SYSTEM OVER TEXAS WILL MOVE
ACROSS THE REGION TONIGHT.

NUMEROUS THUNDERSTORMS WILL CONTINUE IN ADVANCE OF THE LOW PRESSURE
SYSTEM TONIGHT. SOME THUNDERSTORMS WILL LIKELY BE SEVERE PRODUCING
DAMAGING WIND GUSTS AND ISOLATED TORNADOES.

HEAVY RAINFALL...A FLOOD WATCH IS ALSO IN EFFECT FOR SOUTHEAST
LOUISIANA AND EXTREME SOUTH MISSISSIPPI. HEAVY RAINFALL FROM
THE THUNDERSTORM ACTIVITY WILL LIKELY PRODUCE STORM TOTALS 1 TO 3
INCHES OVER THE AREA WITH LOCAL PER HOUR WITH LOCAL AMOUNTS OF 3 TO 5
INCHES.

MARINE...
A SMALL CRAFT ADVISORY IS IN EFFECT FOR THE GULF COASTAL WATERS AND
TIDAL LAKES FOR STRONG ONSHORE FLOW OF 20 TO 25 KNOTS AND GUSTY. IN
ADDITIONAL TIDES WILL RANGE FROM 1 TO 2 FEET ABOVE NORMAL DUE TO THE
STRONG ONSHORE WINDS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

HAZARDOUS WEATHER IS NOT EXPECTED DURING THE PERIOD.

.SPOTTER INFORMATION STATEMENT...

THE ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS AND EMERGENCY
MANAGEMENT PERSONNEL...IN SUPPORT OF SEVERE WEATHER OPERATIONS...IS
REQUESTED THIS AFTERNOON AND TONIGHT.

In the hours before

Special weather statement, Apr 11, 4:49 PM CDT, 5 hours 29 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
449 PM CDT MON APR 11 2005

LAZ035-036-MSZ068-069-112247-
AMITE MS-EAST FELICIANA LA-WEST FELICIANA LA-WILKINSON MS-
449 PM CDT MON APR 11 2005

AT 443 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF STRONG THUNDERSTORMS EXTENDING FROM NEAR CROSBY TO
CENTREVILLE TO NEAR JACKSON.  THIS LINE OF THUNDERSTORMS IS MOVING TO
THE EAST NORTHEAST AT 30 MPH...AND WILL AFFECT AREAS IN AND NEAR
CROSBY...CENTREVILLE...JACKSON...LIBERTY...NORWOOD...CLINTON...AND
FELPS THROUGH 545 PM CDT.  THIS LINE OF THUNDERSTORMS IS CAPABLE OF
PRODUCING WINDS GUSTING TO 45 MPH...FREQUENT LIGHTNING...AND HEAVY
DONWPOURS.

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

32

Local storm report, Apr 11, 6:56 PM CDT, 3 hours 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
656 PM CDT MON APR 11 2005

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

0624 PM     HAIL             THIBODAUX               29.79N 90.82W
04/11/2005  0.75 INCH        LAFOURCHE          LA   PUBLIC

&&

8

Local storm report, Apr 11, 9:17 PM CDT, 1 hour 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
917 PM CDT MON APR 11 2005

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

0604 PM     FUNNEL CLOUD     GILLSBERG               31.02N 90.66W
04/11/2005                   AMITE              MS   EMERGENCY MNGR

0620 PM     FUNNEL CLOUD     MCCOMB AIRPORT          31.18N 90.47W
04/11/2005                   PIKE               MS   EMERGENCY MNGR

0655 PM     TSTM WND DMG     5 SE TYLERTOWN          31.07N 90.08W
04/11/2005                   WALTHALL           MS   EMERGENCY MNGR

            TREES AND POWERLINES DOWN IN SOUTHEAST PORTION OF
            WALTHALL COUNTY.

0655 PM     TORNADO          5 E TYLERTOWN           31.12N 90.06W
04/11/2005                   WALTHALL           MS   STORM CHASER

            SMALL TORNADO OBSERVED.

&&

Special weather statement, Apr 11, 10:10 PM CDT, 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1010 PM CDT MON APR 11 2005

MSZ080-120345-
HANCOCK-
1010 PM CDT MON APR 11 2005

...STRONG THUNDERSTORMS MOVING ACROSS HANCOCK COUNTY...

A LINE OF STRONG THUNDERSTORMS EXTENDING FROM SELLERS TO EAST OF
NAPOLEON WILL MOVE EAST ACROSS HANCOCK COUNTY THROUGH 1045 PM CDT.
THESE THUNDERSTORMS WILL PRODUCE FREQUENT LIGHTNING...GUSTY WINDS
TO 45 MPH...AND HEAVY DOWNPOURS OF RAIN AS THEY AFFECT AREAS AROUND
KILN...DIAMONDHEAD AND WAVELAND.

A TORNADO WATCH REMAINS IN EFFECT THROUGH 11 PM CDT.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 7:13 PM CDT	Severe Thunderstorm Warning	LIX	Walthall	32 min
Apr 11, 8:00 PM CDT	Tornado Warning	LIX	Pearl River	45 min
Apr 11, 8:44 PM CDT	Tornado Warning	LIX	Pearl River	46 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2005 Every 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.