Alert archive / Mississippi / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 342, NWS Jackson, MS

July 21, 2002Attala County, Leake County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Jul 21, 2002, 3:44 PM CDT for Attala County, Leake County, Mississippi. It was in force for 61 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: Jul 21, 2002, 3:44 PM CDT (20:44 UTC)
Expired: Jul 21, 2002, 4:45 PM CDT
In force: 61 min
Issued by: NWS Jackson, MS
Area: Counties, with a storm outline in the text

Counties Attala County, MS, Leake County, MS

What was reported inside it

Time	Report	Where	Remark
Jul 21, 4:00 PM CDT	Thunderstorm Wind	Countywide, MS	Numerous trees were blown down across the county. In addition, a roof was also blown off a chicken house.

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 nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 8.7 hours before the alert went out and 222 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: 4554 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 1064 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 23 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

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

285 
WUUS54 KJAN 212044
SVRJAN
MSC007-079-212145-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSON MS
344 PM CDT SUN JUL 21 2002

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ATTALA COUNTY IN CENTRAL MISSISSIPPI
  LEAKE COUNTY IN CENTRAL MISSISSIPPI

* UNTIL 445 PM CDT

* AT 344 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 15 MILES NORTHWEST OF CARTHAGE...OR ABOUT 11
  MILES SOUTHWEST OF KOSCIUSKO...MOVING SOUTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL...
  BE NEAR CARTHAGE AT 420 PM CDT

WINDS FROM 60 TO 70 MPH ARE LIKELY WITH THIS STORM.

HAIL TO THE SIZE OF QUARTERS IS LIKELY WITH THIS STORM.

LAT...LON 3305 8966 3296 8985 3281 8970 3259 8965
          3261 8939

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.

NWS Jackson, MS wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 21, 3:25 PM CDT, 19 minutes earlier.

Area forecast discussion, Jul 21, 3:25 PM CDT, 19 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSON MS
325 PM CDT SUN JUL 21 2002

THE MAIN FORECAST CONCERN OVER THE NEXT FEW DAYS WILL CONTINUE TO BE
THE CHANCE OF SHOWERS AND THUNDERSTORMS AND THE EFFECT OF A MID
SUMMER FRONT THAT SHOULD PUSH INTO MISSISSIPPI BY WEDNESDAY.

FOR TONIGHT...EXPECT THUNDERSTORM ACTIVITY TO PERSIST INTO THE
EVENING HOURS AS BOUNDARIES FROM ONGOING CONVECTION CONTINUE TO
INITIATE ADDITIONAL SHOWER AND THUNDERSTORM ACTIVITY UP TO SEVERAL
HOURS AFTER SUNSET. A FEW SHOWERS OR THUNDERSTORMS COULD ALSO
DEVELOP LATER ON DURING THE NIGHT...BUT COVERAGE AFTER 9 PM SHOULD
BE VERY ISOLATED. FOR MONDAY AND TUESDAY...NOT MUCH CHANGE. EXPECT
CONTINUED WARM AND HUMID CONDITIONS WITH SCATTERED MAINLY AFTERNOON
AND EVENING THUNDERSTORMS. THUNDERSTORM ACTIVITY TUESDAY EVENING MAY
CONTINUE THROUGH THE NIGHT ACROSS PORTIONS OF THE FORECAST AREA DUE
TO AN APPROACHING FRONTAL SYSTEM. WILL KEEP SCATTERED SHOWERS AND
THUNDERSTORMS IN FORECAST FOR ALL ZONES THROUGH WEDNESDAY. WILL GO
WITH POPS FOR WEDNESDAY IN THE 40 PERCENT RANGE DUE TO ANTICIPATED
MOVEMENT OF A WEAK FRONT THROUGH MISSISSIPPI AND NORTHEAST LOUISIANA
DURING THE DAY.

FOR TEMPERATURES...MORE OF THE SAME WARM AND HUMID CONDITIONS.
SLIGHTLY COOLER TEMPERATURES ARE EXPECTED IN NORTHERN ZONES DUE TO
THE IMPACT OF THE FRONT...BUT WILL STILL KEEP HIGHS AROUND 90 THERE.
NOT MUCH CHANCE OF SIGNIFICANTLY COOL AIR MAKING IT INTO OUR
FORECAST AREA IN LATE JULY

IN THE EXTENDED...THURSDAY THROUGH SUNDAY...THUNDERSTORM ACTIVITY
SHOULD BE LESS WIDESPREAD THROUGH SATURDAY...ESPECIALLY IN NORTHERN
AND WESTERN SECTIONS AS DRIER AIR MOVES INTO THE LOWER MISSISSIPPI
VALLEY FOR SEVERAL DAYS. BY SUNDAY...EXPECT SCATTERED AFTERNOON AND
EVENING CONVECTION ONCE AGAIN. SLIGHTLY COOLER TEMPERATURES IN
NORTHERN SECTIONS ARE LIKELY FOR THURSDAY...BUT BACK INTO THE 90S
ACROSS THE ENTIRE FORECAST AREA BY FRIDAY.

PRELIM NUMBERS:
JAN 73/93/73/93 2423
MEI 72/92/72/92 2423

.JAN...
AR...NONE.
LA...NONE.
MS...NONE.

15

In the hours before

Local storm report, Jul 21, 3:34 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSON MS
334 PM CDT SUN JUL 21 2002

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0300 PM    10SW LOUISVILLE           MS   60 MPH WIND GUST
07/21/02   WINSTON                        REPORTED BY SPOTTER

0320 PM    5W COLUMBIA               MS   1.75 INCH HAIL
07/21/02   MARION                         REPORTED BY MARION COUNTY
                                          EOC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 2:03 PM CDT	Severe Thunderstorm Warning	JAN	Kemper, Lauderdale	42 min
Jul 21, 2:21 PM CDT	Severe Thunderstorm Warning	JAN	Covington, Forrest, Jones, Lamar	44 min
Jul 21, 2:44 PM CDT	Severe Thunderstorm Warning	JAN	Winston	46 min
Jul 21, 2:53 PM CDT	Severe Thunderstorm Warning	JAN	Jefferson Davis, Lawrence, Lincoln, Marion	37 min
Jul 21, 2:54 PM CDT	Severe Thunderstorm Warning	JAN	Holmes	41 min
Jul 21, 3:01 PM CDT	Severe Thunderstorm Warning	JAN	Neshoba	39 min
Jul 21, 3:08 PM CDT	Severe Thunderstorm Warning	JAN	Humphreys, Sharkey, Yazoo	42 min
Jul 21, 3:13 PM CDT	Severe Thunderstorm Warning	JAN	Jasper	42 min
Jul 21, 3:31 PM CDT	Severe Thunderstorm Warning	JAN	Lincoln	44 min
Jul 21, 3:37 PM CDT	Severe Thunderstorm Warning	JAN	Carroll, Holmes	43 min
Jul 21, 3:53 PM CDT	Severe Thunderstorm Warning	JAN	Humphreys, Sunflower	52 min
Jul 21, 4:23 PM CDT	Severe Thunderstorm Warning	JAN	Carroll, Holmes	42 min
Jul 21, 4:27 PM CDT	Severe Thunderstorm Warning	JAN	Madison, Yazoo	43 min
Jul 21, 4:41 PM CDT	Severe Thunderstorm Warning	JAN	Noxubee	59 min
Jul 21, 5:04 PM CDT	Severe Thunderstorm Warning	JAN	Lowndes	46 min
Jul 21, 5:10 PM CDT	Severe Thunderstorm Warning	JAN	Rankin, Smith	60 min
Jul 21, 5:12 PM CDT	Severe Thunderstorm Warning	JAN	Madison	43 min
Jul 21, 5:25 PM CDT	Severe Thunderstorm Warning	JAN	Sharkey, Washington	40 min
Jul 21, 5:26 PM CDT	Severe Thunderstorm Warning	JAN	Oktibbeha	44 min
Jul 21, 5:30 PM CDT	Severe Thunderstorm Warning	JAN	Hinds	40 min
Jul 21, 5:33 PM CDT	Severe Thunderstorm Warning	JAN	Hinds	37 min
Jul 21, 6:07 PM CDT	Severe Thunderstorm Warning	JAN	Clay, Webster	43 min
Jul 21, 6:12 PM CDT	Severe Thunderstorm Warning	JAN	Hinds, Rankin	48 min
Jul 21, 6:51 PM CDT	Severe Thunderstorm Warning	JAN	Grenada	49 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2002 Every 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.