Alert archive / Mississippi / Tornado Warnings in 2011

Tornado Warning 46, NWS New Orleans, LA

April 4, 2011Harrison County, Mississippi

NWS New Orleans, LA issued this tornado warning at Apr 4, 2011, 8:04 PM CDT for Harrison County, Mississippi. It was in force for 41 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 4, 2011, 8:04 PM CDT (01:04 UTC)
Expired: Apr 4, 2011, 8:45 PM CDT
In force: 41 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

County Harrison County, MS

The radar

The Mobile radar (KMOB), 83 km from the middle of the area, began a volume at 01:07 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 was reported inside it

Time	Report	Where	Remark
Apr 4, 8:25 PM CDT	TSTM WND DMG	Gulfport, MS	ROOF OFF OF BUSINESSES IN NORTHWOOD HILLS SHOPPING CENTER 12100 HWY 49. TREES DOWN NEAR ORANGE GROVE RD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 4, 5:28 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 1.1 hours before the alert went out and 65 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: 3275 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 562 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 245 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 4.7
Supercell composite: 20.4

Open this sounding in Storm Lab

The text

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

792 
WFUS54 KLIX 050104
TORLIX
MSC047-050145-
/O.NEW.KLIX.TO.W.0046.110405T0104Z-110405T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
804 PM CDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL HARRISON COUNTY IN SOUTHERN MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...GULFPORT...BILOXI...

* UNTIL 845 PM CDT

* AT 759 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 13 MILES WEST OF
  LYMAN...OR 6 MILES NORTH OF DIAMONDHEAD...MOVING EAST AT 50 MPH.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS UNDER A WORKBENCH OR OTHER
PIECE OF STURDY FURNITURE. SEEK SHELTER ON THE LOWEST FLOOR OF THE
BUILDING IN AN INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE
BLANKETS OR PILLOWS TO COVER YOUR BODY AND ALWAYS STAY AWAY FROM
WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT TUESDAY MORNING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 3039 8899 3038 8900 3038 8933 3058 8933
      3060 8888 3039 8888
TIME...MOT...LOC 0104Z 272DEG 43KT 3047 8928

$$

1 follow-up statement

355 
WWUS54 KLIX 050127
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
827 PM CDT MON APR 4 2011

MSC047-050145-
/O.CON.KLIX.TO.W.0046.000000T0000Z-110405T0145Z/
HARRISON MS-
827 PM CDT MON APR 4 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR CENTRAL
HARRISON COUNTY...

AT 821 PM CDT...A TORNADO WAS REPORTED.  THIS TORNADO WAS LOCATED 6
MILES NORTHEAST OF GULFPORT AIRPORT...OR 6 MILES NORTHWEST OF
BILOXI...MOVING EAST AT 55 MPH.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS UNDER A WORKBENCH OR OTHER
PIECE OF STURDY FURNITURE. SEEK SHELTER ON THE LOWEST FLOOR OF THE
BUILDING IN AN INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE
BLANKETS OR PILLOWS TO COVER YOUR BODY AND ALWAYS STAY AWAY FROM
WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT TUESDAY MORNING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 3039 8899 3038 8900 3038 8933 3058 8933
      3060 8888 3039 8888
TIME...MOT...LOC 0127Z 267DEG 46KT 3047 8892

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 7:00 PM CDT	Tornado Warning	LIX	Pearl River	45 min
Apr 4, 7:42 PM CDT	Tornado Warning	LIX	Hancock	48 min
Apr 4, 7:47 PM CDT	Severe Thunderstorm Warning	LIX	Hancock, Harrison, Jackson, Pearl River	73 min
Apr 4, 8:31 PM CDT	Tornado Warning	LIX	Jackson	44 min

Nearby

Tornado Warnings in Mississippi, 2011 Every tornado warning in 2011 Tornadoes in 2011

Sources

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