Alert archive / Mississippi / Tornado Warnings in 1999

Tornado Warning 39, NWS New Orleans, LA

June 25, 1999Harrison County, Mississippi

NWS New Orleans, LA issued this tornado warning at Jun 25, 1999, 12:40 PM CDT for Harrison County, Mississippi. It was in force for 20 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
Jun 25, 1999, 12:40 PM CDT (17:40 UTC)
Expired
Jun 25, 1999, 1:00 PM CDT
In force
20 min
Issued by
NWS New Orleans, LA
Area
Whole counties

County Harrison County, MS

The radar

The Mobile radar (KMOB), 86 km from the middle of the area, began a volume at 17:40 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 nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.7 hours before the alert went out and 62 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 1999-06-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1109 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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 1999-06-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 square meters per square second.1939Sfc1 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
1109 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
874 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

The text

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

659 
WFUS1 KNEW 251742 RRA
TORNEW
GMZ555-MSC047-251800-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1240 PM CDT FRI JUN 25 1999

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS LA HAS ISSUED A...

* TORNADO WARNING FOR
   - EXTREME SOUTHERN HARRISON COUNTY IN SOUTHERN MISSISSIPPI

* UNTIL 100 PM CDT

* AT 1235 PM CDT... SHERIFFS DEPARTMENT REPORTED A WATERSPOUT
  APPROACHING THE VICINITY OF THE GRAND CASINO IN GULFPORT.
  DRIFTING SLOWLY TO THE THE NORTHEAST.

IF YOU ARE IN THESE AREAS...SEEK SHELTER IN A SMALL INTERIOR ROOM
AWAY FROM WINDOWS

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING.  AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH
OR LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

&

What forecasters said that day

The local office's own words before this tornado 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, Jun 25, 12:10 PM CDT, 30 minutes before
LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-260100-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1210 PM CDT FRI JUN 25 1999

AN ABUNDANCE OF TROPICAL MOISTURE ACROSS THE REGION IS BECOMING
DISTURBED BY A WEAK TROUGH OF LOW PRESSURE DRIFTING INTO THE STATE
FROM ARKANSAS.

TROPICAL RAINSHOWERS AND THUNDERSTORMS WILL BECOME WIDESPREAD
THROUGHOUT THE AFTERNOON AND EVENING. HOWEVER...SEVERE THUNDERSTORMS
ARE NOT EXPECTED TODAY. THE MAIN THREAT WILL BE BRIEF HEAVY RAINFALL
AT THE RATES OF ONE TO TWO INCHES PER HOUR...OCCASIONAL LIGHTNING AND
WIND GUSTS OF 30 TO 40 MPH FROM SOME OF THE STRONGER STORMS.
WATERSPOUTS MAY ALSO FORM OVER LARGE BODIES OF WATER.
Special weather statement, Jun 25, 12:10 PM CDT, 30 minutes before
LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-260100-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1210 PM CDT FRI JUN 25 1999

AN ABUNDANCE OF TROPICAL MOISTURE ACROSS THE REGION IS BECOMING
DISTURBED BY A WEAK TROUGH OF LOW PRESSURE DRIFTING INTO THE STATE
FROM ARKANSAS.

TROPICAL RAINSHOWERS AND THUNDERSTORMS WILL BECOME WIDESPREAD
THROUGHOUT THE AFTERNOON AND EVENING. HOWEVER...SEVERE THUNDERSTORMS
ARE NOT EXPECTED TODAY. THE MAIN THREAT WILL BE BRIEF HEAVY RAINFALL
AT THE RATES OF ONE TO TWO INCHES PER HOUR...OCCASIONAL LIGHTNING AND
WIND GUSTS OF 30 TO 40 MPH FROM SOME OF THE STRONGER STORMS.
WATERSPOUTS MAY ALSO FORM OVER LARGE BODIES OF WATER.

Nearby

Tornado Warnings in Mississippi, 1999Every tornado warning in 1999Tornadoes 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; radar from the NEXRAD Level II archive.