Alert archive / Mississippi / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 449, NWS Jackson, MS
NWS Jackson, MS issued this severe thunderstorm warning at Aug 20, 2002, 6:56 PM CDT for Lowndes County, Mississippi. It was in force for 44 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 20, 2002, 6:56 PM CDT (23:56 UTC)
- Expired
- Aug 20, 2002, 7:40 PM CDT
- In force
- 44 min
- Issued by
- NWS Jackson, MS
- Area
- Counties, with a storm outline in the text
County Lowndes County, MS
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 20, 7:20 PM CDT | Thunderstorm Wind | Countywide, MS | Several trees were blown down in Columbus, as well as the remainder of Lowndes County. |
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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 20, 2:10 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Birmingham, AL (KBMX), launched 12:00Z, 11.9 hours before the alert went out and 157 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
- 1890 J/kg
- Mixed-layer CIN
- -63 J/kg
- Mixed-layer LCL
- 786 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 52 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
224
WUUS54 KJAN 202356
SVRJAN
MSC087-210040-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSON MS
653 PM CDT TUE AUG 20 2002
THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
LOWNDES COUNTY IN NORTHEAST MISSISSIPPI
* UNTIL 740 PM CDT
* AT 653 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 6 MILES NORTH OF COLUMBUS...OR ABOUT 4 MILES
SOUTHEAST OF COLUMBUS AFB...MOVING SOUTHWEST AT 15 MPH.
* THE SEVERE THUNDERSTORM WILL...
BE NEAR COLUMBUS...TIBBEE AND MAYHEW BY 715 PM CDT
DAMAGING WINDS FROM 60 TO 70 MPH AND TORRENTIAL RAINS ARE LIKELY. GO
INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS.
LAT...LON 3369 8828 3366 8840 3353 8853 3335 8868
3332 8835What 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.
NWS Jackson, MS wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 20, 4:05 PM CDT, 2 hours 51 minutes earlier.
Area forecast discussion, Aug 20, 4:05 PM CDT, 2 hours 51 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE JACKSON MS 315 PM CDT TUE AUG 20 2002 AIR MASS CONTINUES VERY MOIST AND UNSTABLE. BEST DYNAMICS LOCATED ERN ZONES WHERE LOWLEVEL CONVERGENCE IS BEST. CONVECTION SHOULD BE GENERALLY DIURNAL. UPPER TROUGHING INCREASING SLIGHTLY WED. SHORTWAVE SLIPS WWD UNDERNEATH UPPER RIDGE...MOVING ACROSS MS COAST INTO SRN LA. WEAK UPPER DIVERGENCE AND WEAK SURFACE BOUNDARY NOTED OVER REGION TOMORROW. MID/UPPER HEIGHTS SHOW VERY LITTLE CHANGE SO EXPECT WEAK CAPPING EFFECTS TO LINGER NRN ZONES. WILL KEEP SLIGHT CHANCE NRN AREAS AND CHC POPS SRN AREAS WITH ISOLATED EVENING CONVECTION FOR WED NIGHT. UPPER TROUGH POSITIONED OVER LA/WRN MS BY THU MORNING WITH WEAK SHEAR ZONE SUGGESTED ACROSS THE AREA. 500 MB HEIGHT REMAIN HIGH. WITH LOW LEVEL BOUNDARY LINGERING ACROSS CENTRAL/SRN ZONES WILL GO WITH CHANCE POPS ALL AREAS FOR THU INTO THU NIGHT. TROUGH SHIFTS TO THE W AND UPPER TROUGHING DIMINISHES FOR FRI AFOR FORECAST AREA. NO SURFACE FORCING NOTED SO WILL KEEP ISOLATED CONVECTION ACROSS THE REGION FOR FRI AFTERNOON ADN EVENING. HEIGHTS BEGIN TO FALL FRIDAY NIGHT AND THE SHORTWAVE TRACK THAT HAS PERSISTED WELL NORTH OF THE REGION DROPS THIS WAY. SURFACE BOUNDARY DROPS INTO NRN AREAS BY 00Z SUNDAY. JET MAX REMAINS TO THE NORTH BUT WILL SEE RIGHT REAR JET QUAD CLOSE ENOUGH TO EFFECT FORECAST AREA...ESPECIALLY NRN ZONES. UPPER TROUGHING CONTINUES THROUGH MONDAY...WEAKENING TUESDAY. BY TUESDAY SURFACE BOUNDARY FINALLY SHIFTS TO THE E BUT WILL MAINTAIN CHANCE OF AFTERNOON ACTIVITY THROUGH EXTENDED PERIOD. PRELIM NUMBERS: JAN 72/93/73/92 2223 MEI 71/93/72/92 2223 .JAN... AR...NONE. LA...NONE. MS...NONE.
In the hours before
Special weather statement, Aug 20, 2:39 PM CDT, 4 hours 17 minutes before
ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025>066-072>074- 211200- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE JACKSON MS 239 PM CDT TUE AUG 20 2002 ...THUNDERSTORMS... ISOLATED SEVERE THUNDERSTORMS WILL BE POSSIBLE THROUGH 8 PM TONIGHT ALONG AND SOUTHEAST OF A RAYVILLE TO VICKSBURG TO CANTON TO KOSCIUSKO TO EUPORA LINE. DAMAGING WIND GUSTS TO 70 MPH WILL BE THE MAIN THREAT WITH THESE STORMS. A VERY MOIST AND UNSTABLE AIRMASS IS IN PLACE ACROSS THE LOWER MISSISSIPPI VALLEY TODAY. A DISTURBANCE IN THE UPPER LEVELS OF THE ATMOSPHERE WILL MOVE SOUTHWEST ACROSS THE AREA...TRIGGERING SCATTERED THUNDERSTORMS. DUE TO THE STRONG INSTABILITY IN PLACE...A FEW OF THESE STORMS MAY BECOME SEVERE OVER PORTIONS OF NORTHEAST LOUISIANA AND MUCH OF SOUTHERN AND EASTERN MISSISSIPPI. THE THUNDERSTORMS SHOULD GRADUALLY DISSIPATE AFTER SUNSET. ACTIVATION OF STORM SPOTTERS...EMERGENCY MANAGEMENT PERSONNELL...AND HAM RADIO OPERATORS MAY BE NEEDED THIS AFTERNOON AND EVENING. FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.SRH.NOAA.GOV/JAN. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK.
Local storm report, Aug 20, 3:14 PM CDT, 3 hours 42 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSON MS
314 PM CDT TUE AUG 20 2002
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0307 PM 3S NEWTON MS 0.88 INCH HAIL
08/20/02 NEWTONSpecial weather statement, Aug 20, 4:37 PM CDT, 2 hours 19 minutes before
MSZ030>033-037>039-044>046-049>052-055>058-062>066-202230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE JACKSON MS 437 PM CDT TUE AUG 20 2002 THE NATIONAL WEATHER SERVICE IN JACKSON HAS CANCELED SEVERE THUNDERSTORM WATCH NUMBER 623 FOR THE FOLLOWING COUNTIES... ATTALA LEAKE SCOTT RANKIN LAUDERDALE NEWTON JASPER CLARKE SMITH SIMPSON JONES COVINGTON JEFFERSON DAVIS LAWRENCE LINCOLN NESHOBA SEVERE THUNDERSTORM WATCH NUMBER 623 REMAINS IN EFFECT UNTIL 7 PM FOR THE FOLLOWING COUNTIES... CHOCTAW CLAY LOWNDES WINSTON NOXUBEE KEMPER OKTIBBEHA
The office that day
Everything else NWS Jackson, MS issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 1:31 PM CDT | Severe Thunderstorm Warning | JAN | Newton | 29 min |
| Aug 20, 1:54 PM CDT | Severe Thunderstorm Warning | JAN | Smith | 41 min |
| Aug 20, 2:00 PM CDT | Severe Thunderstorm Warning | JAN | Jasper | 45 min |
| Aug 20, 2:45 PM CDT | Severe Thunderstorm Warning | JAN | Jasper | 30 min |
| Aug 20, 2:48 PM CDT | Severe Thunderstorm Warning | JAN | Simpson | 42 min |
| Aug 20, 2:52 PM CDT | Severe Thunderstorm Warning | JAN | Newton | 43 min |
| Aug 20, 3:32 PM CDT | Severe Thunderstorm Warning | JAN | Copiah | 43 min |
Nearby
Severe Thunderstorm Warnings in Mississippi, 2002Every severe thunderstorm warning in 2002
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.