Alert archive / Mississippi / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 9, NWS New Orleans, LA

January 2, 1999Harrison County, Jackson County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Jan 2, 1999, 9:12 AM CST for Harrison County, Jackson County, Mississippi. It was in force for 33 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: Jan 2, 1999, 9:12 AM CST (15:12 UTC)
Expired: Jan 2, 1999, 9:45 AM CST
In force: 33 min
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Harrison County, MS, Jackson County, MS

The watch it was issued in

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

Issued	Product	Office	Lasted
Jan 2, 9:00 AM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.2 hours before the alert went out and 84 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: 549 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 615 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 256 m²/s²
0-3 km storm-relative helicity: 331 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.7

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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.

In the hours before

Special weather statement, Jan 2, 8:13 AM CST, 59 minutes before

LAZ034>039-046>050-056>060-065>067-MSZ068>071-021500-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
813 AM CST SAT JAN 2 1999

THE TORNADO WATCH ISSUED EARLIER HAS BEEN CANCELED. THE LINE OF
VERY STRONG THUNDERSTORMS HAS MOVED EAST THROUGH THE AREA. HOWEVER
A LARGE AREA OF RAIN AND A FEW THUNDERSTORMS WILL CONTINUE FOR A FEW
HOURS. PRECIPITATION WILL GRADUALLY END FROM THE WEST.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 2, 4:38 AM CST	Tornado Warning	LIX	Pointe Coupee	32 min
Jan 2, 4:49 AM CST	Tornado Warning	LIX	West Feliciana	31 min
Jan 2, 5:36 AM CST	Tornado Warning	LIX	East Feliciana, Saint Helena	34 min
Jan 2, 6:26 AM CST	Tornado Warning	LIX	Tangipahoa, Washington	34 min
Jan 2, 6:56 AM CST	Severe Thunderstorm Warning	LIX	Lafourche, Saint Charles, Saint John the Baptist	34 min
Jan 2, 7:05 AM CST	Tornado Warning	LIX	Saint Charles, Saint John the Baptist	30 min
Jan 2, 7:53 AM CST	Severe Thunderstorm Warning	LIX	Saint Tammany	32 min
Jan 2, 8:09 AM CST	Tornado Warning	LIX	Saint Tammany	16 min
Jan 2, 8:54 AM CST	Severe Thunderstorm Warning	LIX	Plaquemines	21 min
Jan 2, 4:29 AM CST	Severe Thunderstorm Warning	LIX	Wilkinson	31 min
Jan 2, 6:26 AM CST	Tornado Warning	LIX	Walthall	34 min
Jan 2, 8:13 AM CST	Tornado Warning	LIX	Hancock	32 min
Jan 2, 8:37 AM CST	Tornado Warning	LIX	Harrison	33 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 1999 Every severe thunderstorm warning in 1999

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.