Alert archive / Mississippi / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 511, NWS Jackson, MS

June 11, 1999Covington County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Jun 11, 1999, 1:52 PM CDT for Covington County, Mississippi. It was in force for 33 min. 1 report 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
Jun 11, 1999, 1:52 PM CDT (18:52 UTC)
Expired
Jun 11, 1999, 2:25 PM CDT
In force
33 min
Issued by
NWS Jackson, MS
Area
Whole counties

County Covington County, MS

What was reported inside it

TimeReportWhereRemark
Jun 11, 2:05 PM CDTThunderstorm WindCollins, MSPower lines were blown down.

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 nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 6.9 hours before the alert went out and 91 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, Jackson, MS at 12:00Z on 1999-06-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 589 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jackson, MS at 12:00Z on 1999-06-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
589 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
992 m above ground
0-6 km bulk shear
3 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
-18 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

366 
WUUS1 KJAN 111854 RRA
SVRJAN
MSC031-111925-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSON MS
152 PM CDT FRI JUN 11 1999

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  COVINGTON COUNTY IN SOUTHEASTERN MISSISSIPPI

* UNTIL 225 PM CDT

* AT 153 PM CDT... RADAR INDICATED A RAPIDLY DEVELOPING SEVERE
  THUNDERSTORM 2 MILES WEST OF COLLINS... MOVING SOUTH AT LESS THAN
  5 MPH.

THIS STORM WILL MAINLY AFFECT SMALLER COMMUNITIES AND RURAL AREAS.

DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS

64


&

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, Jun 11, 9:45 AM CDT, 4 hours 7 minutes before
ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025>066-072>074-
120400-

AREA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE JACKSON MS
945 AM CDT FRI JUN 11 1999

SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS MUCH OF
MISSISSIPPI...NORTHEAST LOUISIANA...AND EXTREME SOUTHEAST ARKANSAS
THIS AFTERNOON. THESE WILL BE TRIGGERED BY A COMBINATION OF
HEATING...A MOIST AND UNSTABLE AIRMASS...AND A WEAK UPPER LEVEL
DISTURBANCE DRIFTING ALONG THE GULF COAST.

ORGANIZED SEVERE WEATHER IS NOT EXPECTED DUE TO WEAK WINDS IN THE
ATMOSPHERE. HOWEVER...STRONGER THUNDERSTORMS MAY PRODUCE LOCALLY
EXCESSIVE RAINFALL AND GUSTY WINDS AS THEY DRIFT SLOWLY NORTHWEST.

ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND EMERGENCY
MANAGEMENT PERSONNEL IS NOT ANTICIPATED THROUGH TONIGHT.

FOR MORE INFORMATION...PLEASE VISIT OUR INTERNET WEB SITE AT:
HTTP://WWW.JANNWS.STATE.MS.US
Special weather statement, Jun 11, 9:45 AM CDT, 4 hours 7 minutes before
ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025>066-072>074-
120400-

AREA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE JACKSON MS
945 AM CDT FRI JUN 11 1999

SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS MUCH OF
MISSISSIPPI...NORTHEAST LOUISIANA...AND EXTREME SOUTHEAST ARKANSAS
THIS AFTERNOON. THESE WILL BE TRIGGERED BY A COMBINATION OF
HEATING...A MOIST AND UNSTABLE AIRMASS...AND A WEAK UPPER LEVEL
DISTURBANCE DRIFTING ALONG THE GULF COAST.

ORGANIZED SEVERE WEATHER IS NOT EXPECTED DUE TO WEAK WINDS IN THE
ATMOSPHERE. HOWEVER...STRONGER THUNDERSTORMS MAY PRODUCE LOCALLY
EXCESSIVE RAINFALL AND GUSTY WINDS AS THEY DRIFT SLOWLY NORTHWEST.

ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND EMERGENCY
MANAGEMENT PERSONNEL IS NOT ANTICIPATED THROUGH TONIGHT.

FOR MORE INFORMATION...PLEASE VISIT OUR INTERNET WEB SITE AT:
HTTP://WWW.JANNWS.STATE.MS.US

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 11, 3:51 PM CDTSevere Thunderstorm WarningJANRankin34 min
Jun 11, 4:36 PM CDTSevere Thunderstorm WarningJANYazoo34 min
Jun 11, 4:45 PM CDTSevere Thunderstorm WarningJANClaiborne35 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 1999Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.