Alert archive / Mississippi / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 128, NWS New Orleans, LA

May 15, 2008Jackson County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at May 15, 2008, 10:28 AM CDT for Jackson County, Mississippi. It was in force for 32 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: May 15, 2008, 10:28 AM CDT (15:28 UTC)
Expired: May 15, 2008, 11:00 AM CDT
In force: 32 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

County Jackson County, MS

The radar

The Mobile radar (KMOB), 44 km from the middle of the area, began a volume at 15:28 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
May 15, 8:58 AM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.5 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-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: 1782 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 501 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 197 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 8.4

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 May 15, 4:20 AM CDT, 6 hours 8 minutes earlier.

Area forecast discussion, May 15, 4:20 AM CDT, 6 hours 8 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS LA
420 AM CDT THU MAY 15 2008

.UPDATE...
TOR WATCH #325 ISSUED THIS MORNING WITH VALID TIMES OF 5AM TIL
11AM. CONDITIONS WILL WARRANT ISOLATED TORNADIC DEVELOPMENT MAINLY
DURING THE MORNING. CONDITIONS WILL THEN BEGIN TO EVOLVE INTO MORE
OF A HEAVY RAINFALL SCENARIO WITH ISOLATED SEVERE TS POSSIBLE WITH
LARGE HAIL...DAMAGING WINDS...VERY HEAVY RAINFALL AND CONTINUOUS LIGHTNING
BEING THE MAJOR HAZARDS.

&&

.PREV DISCUSSION... /ISSUED 313 AM CDT THU MAY 15 2008/

SHORT TERM...
THE MAIN FOCUS TODAY WILL BE FLOODING ISSUES. THE FLOOD WATCH THAT
WAS ISSUED YESTERDAY WAS PLACES VERY WELL AND WILL SIMPLY BE
EXTENDED TO TAKE UP ALL SOUTH SHORE REAL ESTATE AS WELL. WILL NOT
EXTEND THE TIME OF THE WATCH YET SINCE CONFIDENCE ON HOW MUCH
RAINFALL WE GET TONIGHT IS SHAKY AT BEST.

CONDITIONS ARE RIPE FOR DEVELOPMENT THIS MORNING OVER THE WESTERN
PART OF LA AND THE WESTERN GULF. ALL SMALL DEVELOPING ACTIVITY
WILL MOVE NE WHILE LARGE AREAS OF CONVECTION WILL MOVE EAST. THE
STRONGEST OF THESE CONVECTIVE CENTROID TS AREAS WILL BE ABLE TO
MODIFY THE LOCAL ENVIRONMENTAL VALUES SUCH AS HELICITY. STORM
ENHANCED INFLOW WILL BE STRONGER THAN AREAS AWAY FROM THE INFLOW
CAUSING WINDS TO INCREASE QUITE A BIT WITH HEIGHT AND VEER AS
WELL. THIS MAY LEAD TO AN ISOLATED TORNADO WITH THE STRONGEST TS
TODAY BUT BY FAR WE WILL BE LOOKING AT TORRENTIAL DOWNPOURS. THE
STRONGEST TS WILL BE ABLE TO PRODUCE LARGE HAIL...STRONG DAMAGING
WINDS AND INTENSE CONTINUOUS LIGHTNING.

LONG TERM...
FRONT MOVES SLOWLY THROUGH THE AREA FRIDAY AND BRINGS SOME COOL
DRY AIR FOR THE WEEKEND AND THE FIRST PART OF THE NEW WORK WEEK.

AVIATION...
TS ACTIVITY WILL BE WIDESPREAD TODAY WITH NUMEROUS AREAS OF
TURBULANCE AND ISOLATED STRONG TO SEVERE TS POSSIBLY AFFECTING ONE
OR TWO TERMINALS. ACTIVITY WILL DECREASE THIS EVENING ONLY TO FIRE
AGAIN OVERNIGHT AND FINALLY MOVE OFFSHORE WITH THE COLD FRONT
FRIDAY MORNING.

MARINE...
STRONG TS WILL BEGIN TO MOVE ACROSS THE COASTAL WATERS TODAY AS A
COLD FRONT MOVES CLOSER TO THE AREA. SOME OF THESE TS WILL PRODUCE
STRONG WINDS TO 40+ KNOTS AND EXTREMELY HEAVY RAINFALL. LIGHTNING
WILL BE FREQUENT TO CONTINUOUS WITH THE STRONGEST ACIVITY AS WELL.
ONCE THE FRONT MOVES THROUGH...MODERATE NORTHERLY WINDS WILL FLOW
IN BRIEFLY.

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  83  65  78  55 /  80  60  30  10
BTR  83  67  78  57 /  90  60  30  10
MSY  83  70  82  61 /  90  60  40  30
GPT  82  69  81  59 /  90  60  40  10

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...FLASH FLOOD WATCH THROUGH THIS EVENING FOR LAZ056>070.

     FLASH FLOOD WATCH THROUGH THIS EVENING FOR LAZ034>040-046>050.

GM...NONE.
MS...FLASH FLOOD WATCH THROUGH THIS EVENING FOR MSZ080>082.

     FLASH FLOOD WATCH THROUGH THIS EVENING FOR MSZ068>071-077.

GM...NONE.
&&

In the hours before

Local storm report, May 15, 9:31 AM CDT, 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
931 AM CDT THU MAY 15 2008

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

0900 AM     TSTM WND DMG     SLIDELL                 30.28N 89.78W
05/15/2008                   ST. TAMMANY        LA   BROADCAST MEDIA

            TURTLE CREEK SUBDIVISION HAD TREES BLOWN DOWN AND
            BASKETBALL POLES SNAPPED.

0845 AM     TSTM WND DMG     3 WNW PONCHATOULA       30.45N 90.49W
05/15/2008                   TANGIPAHOA         LA   EMERGENCY MNGR

            POSSIBLE TORNADO. NUMEROUS TREES BLOWN DOWN IN PUMPKIN
            CENTER COMMUNITY.

0815 AM     TSTM WND DMG     HOUMA                   29.58N 90.71W
05/15/2008                   TERREBONNE         LA   EMERGENCY MNGR

            3 TREES BLOWN DOWN ON HOMES...2 IN HOUMA...1 IN SCHRIEVER

&&

25

Local storm report, May 15, 9:38 AM CDT, 50 minutes before

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Local storm report, May 15, 9:50 AM CDT, 38 minutes before

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Local storm report, May 15, 10:08 AM CDT, 20 minutes before

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Local storm report, May 15, 10:12 AM CDT, 16 minutes before

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Local storm report, May 15, 10:20 AM CDT, 8 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 7:00 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	45 min
May 14, 7:32 PM CDT	Special Marine Warning	LIX		88 min
May 14, 7:40 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	50 min
May 14, 7:41 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Saint Bernard	49 min
May 14, 7:53 PM CDT	Flash Flood Warning	LIX	Saint Tammany	2 hr
May 14, 8:28 PM CDT	River Flood Warning	LIX	Saint Tammany	25 hr
May 14, 8:28 PM CDT	River Flood Warning	LIX	Saint Tammany	64 hr
May 14, 8:39 PM CDT	Flash Flood Warning	LIX	East Baton Rouge, Iberville, Livingston, Pointe Coupee, Tangipahoa, West Baton Rouge	2 hr
May 14, 9:24 PM CDT	River Flood Warning	LIX	Saint Tammany	4 days
May 15, 4:16 AM CDT	River Flood Warning	LIX	Tangipahoa	63 hr
May 15, 6:24 AM CDT	Special Marine Warning	LIX		96 min
May 15, 6:40 AM CDT	Flash Flood Warning	LIX	Livingston	3 hr
May 15, 6:59 AM CDT	Flash Flood Warning	LIX	East Baton Rouge, Iberville, Pointe Coupee, West Baton Rouge	3 hr
May 15, 7:09 AM CDT	Flash Flood Warning	LIX	Tangipahoa	3 hr
May 15, 7:23 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, Iberville, West Baton Rouge	67 min
May 15, 7:42 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Assumption, Saint James	63 min
May 15, 8:16 AM CDT	Severe Thunderstorm Warning	LIX	Livingston	44 min
May 15, 8:17 AM CDT	Special Marine Warning	LIX		88 min
May 15, 8:24 AM CDT	Flash Flood Warning	LIX	Ascension	2 hr
May 15, 8:27 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 1 more	48 min
May 15, 8:37 AM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa	38 min
May 15, 8:50 AM CDT	Severe Thunderstorm Warning	LIX	Washington	40 min
May 15, 8:59 AM CDT	Special Marine Warning	LIX		91 min
May 15, 9:09 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Plaquemines, Saint Bernard	66 min
May 15, 9:13 AM CDT	Tornado Warning	LIX	Washington	32 min
May 15, 9:15 AM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	15 min
May 15, 9:52 AM CDT	Special Marine Warning	LIX		83 min
May 15, 10:06 AM CDT	River Flood Warning	LIX	Tangipahoa	14 hr
May 15, 10:24 AM CDT	Special Marine Warning	LIX		96 min
May 15, 10:43 AM CDT	River Flood Warning	LIX	East Baton Rouge	13 hr
May 15, 11:06 AM CDT	Special Marine Warning	LIX		84 min
May 15, 11:33 AM CDT	Special Marine Warning	LIX		87 min
May 15, 12:25 PM CDT	Special Marine Warning	LIX		35 min
May 14, 8:30 PM CDT	Severe Thunderstorm Warning	LIX	Hancock, Harrison	45 min
May 15, 9:04 AM CDT	Severe Thunderstorm Warning	LIX	Hancock, Pearl River	56 min
May 15, 9:20 AM CDT	Severe Thunderstorm Warning	LIX	Harrison	40 min
May 15, 9:31 AM CDT	Tornado Warning	LIX	Pearl River	29 min
May 15, 9:58 AM CDT	Severe Thunderstorm Warning	LIX	Harrison, Jackson	32 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2008 Every severe thunderstorm warning in 2008

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.