Alert archive / Mississippi / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 511, NWS Jackson, MS
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
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 11, 2:05 PM CDT | Thunderstorm Wind | Collins, MS | Power 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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 3:51 PM CDT | Severe Thunderstorm Warning | JAN | Rankin | 34 min |
| Jun 11, 4:36 PM CDT | Severe Thunderstorm Warning | JAN | Yazoo | 34 min |
| Jun 11, 4:45 PM CDT | Severe Thunderstorm Warning | JAN | Claiborne | 35 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.