Alert archive / Mississippi / Tornado Warnings in 1999

Tornado Warning 15, NWS Jackson, MS

January 17, 1999Leflore County, Mississippi

NWS Jackson, MS issued this tornado warning at Jan 17, 1999, 10:19 PM CST for Leflore County, Mississippi. It was in force for 41 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jan 17, 1999, 10:19 PM CST (04:19 UTC)
Expired: Jan 17, 1999, 11:00 PM CST
In force: 41 min
Issued by: NWS Jackson, MS
Area: Whole counties

County Leflore County, MS

What was reported inside it

Time	Report	Where	Remark
Jan 17, 10:40 PM CST	Hail 1	Greenwood, MS
Jan 17, 10:55 PM CST	Hail 0.75	Greenwood, MS

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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 17, 9:45 PM CST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 4.3 hours before the alert went out and 138 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: 1543 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 801 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 295 m²/s²
0-3 km storm-relative helicity: 407 m²/s²
Significant tornado parameter: 3.2
Supercell composite: 11.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KJAN 180419 RRA
TORJAN
MSC083-180500-

BULLETIN- EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSON MS
1019 PM CST SUN JAN 17 1999

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* TORNADO WARNING FOR...
  LEFLORE COUNTY IN NORTH CENTRAL MISSISSIPPI

* UNTIL 1100 PM CST

* AT 1015 PM CST... RADAR INDICATED A SEVERE THUNDERSTORM WITH A
  TORNADO 15 MILES WEST OF GREENWOOD... MOVING EAST AT 40 MPH.

* SOME LOCATIONS IN THE PATH OF THIS SLTORM INCLUDE...
  GREENWOOD AT 1025 PM CST
  SIDON AT 1030 PM CST

THIS STORM HAS A HISTORY OF GOLFBALL SIZE HAIL. A TORNADO WAS
REPORTED JUST SOUTH OF MOORHEAD AT 1015 PM. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS!

76

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 17, 8:50 PM CST	Severe Thunderstorm Warning	JAN	Sunflower	25 min
Jan 17, 9:45 PM CST	Severe Thunderstorm Warning	JAN	Leflore	30 min
Jan 17, 9:50 PM CST	Severe Thunderstorm Warning	JAN	Sunflower	45 min
Jan 17, 10:22 PM CST	Severe Thunderstorm Warning	JAN	Grenada	48 min
Jan 17, 10:41 PM CST	Severe Thunderstorm Warning	JAN	Carroll	49 min
Jan 17, 11:02 PM CST	Severe Thunderstorm Warning	JAN	Clay	33 min
Jan 17, 11:10 PM CST	Severe Thunderstorm Warning	JAN	Attala, Montgomery	45 min
Jan 17, 11:10 PM CST	Severe Thunderstorm Warning	JAN	Holmes	45 min
Jan 17, 11:55 PM CST	Severe Thunderstorm Warning	JAN	Choctaw	35 min
Jan 18, 12:37 AM CST	Severe Thunderstorm Warning	JAN	Winston	33 min
Jan 18, 1:46 AM CST	Severe Thunderstorm Warning	JAN	Newton	34 min
Jan 18, 1:53 AM CST	Severe Thunderstorm Warning	JAN	Lauderdale	47 min

Nearby

Tornado Warnings in Mississippi, 1999 Every tornado warning in 1999 Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.