Alert archive / Mississippi / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 126, NWS Jackson, MS

May 11, 2004Copiah County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at May 11, 2004, 2:57 PM CDT for Copiah County, Mississippi. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 11, 2004, 2:57 PM CDT (19:57 UTC)
Expired: May 11, 2004, 3:45 PM CDT
In force: 48 min
Issued by: NWS Jackson, MS
Area: Counties, with a storm outline in the text

County Copiah County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 75 km from the middle of the area, began a volume at 19:56 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

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

Jackson, MS (KJAN), launched 12:00Z, 8.0 hours before the alert went out and 72 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: 392 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 620 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 162 m²/s²
0-3 km storm-relative helicity: 183 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KJAN 111957
SVRJAN
MSC029-112045-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSON MS
257 PM CDT TUE MAY 11 2004

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  COPIAH COUNTY IN CENTRAL MISSISSIPPI

* UNTIL 345 PM CDT

* AT 257 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 19 MILES SOUTH OF DENTVILLE...OR ABOUT 15 MILES
  NORTHWEST OF BROOKHAVEN...MOVING NORTH AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL...
  BE NEAR DENTVILLE AT 330 PM CDT

WINDS UP TO 60 MPH ARE LIKELY WITH THIS STORM.

LAT...LON 3170 9072 3171 9050 3204 9037 3205 9066

$$

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 May 11, 11:25 AM CDT, 3 hours 32 minutes earlier.

Area forecast discussion, May 11, 11:25 AM CDT, 3 hours 32 minutes before

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE JACKSON MS
1125 AM CDT TUE MAY 11 2004

.DISCUSSION...
DOING A MESOSCALE/SYNOPTIC ANALYSIS THIS MORNING SHOWS A VARIETY OF
FACTORS COMING TOGETHER FOR WIDESPREAD CONVECTIVE DEVELOPMENT THIS
AFTERNOON: VERY LITTLE EVIDENCE OF CAPPING INVERSION ON MORNING
SOUNDINGS AROUND THE REGION GOOD LOW LEVEL WAA REGIME SET UP OVER
MOST OF SOUTHERN AND WESTERN CWA LOW TO MODERATE LEVELS OF
INSTABILITY (1500-2500 SURFACE-BASED CAPE) PVA ENTERING THE REGION
AS S/W APPROACHES THE MS RIVER DIFFERENTIAL HEATING BOUNDARY
SETTING UP FROM NW TO SE ACROSS THE FORECAST AREA AND SEA-BREEZE
TYPE CONVECTION MIGRATING TOWARD SOUTHEAST MS ZONES. THINKING IS
THAT THE LEAST AMOUNT OF COVERAGE WILL BE ACHIEVED IN NORTHEAST
MISSISSIPPI THIS AFTERNOON...BUT STILL WILL KEEP CHANCE HERE. I
BUMPED UP POPS TO CATEGORICAL IN THE SOUTHEAST AND STRENGTHENED
LIKELIES IN CENTRAL MS NEAR THE DIFF HEATING BOUNDARY. ONLY MINOR
POPS ADJUSTMENT OTHERWISE.

ONLY OTHER MAJOR ADJUSTMENTS WERE MADE TO TEMPERATURES...MAINLY
LOWERING HIGHS AROUND ONE CATEGORY IN AREAS WHERE POPS WHERE
STRENGTHENED. THE REASONING FOR THIS SHOULD BE SELF EVIDENT.

UPDATES TO GRIDS HAVE BEEN MADE WITH ZONES COMING SHORTLY.

&&

.JAN WATCHES/WARNINGS/ADVISORIES...
MS...NONE.
LA...NONE.
AR...NONE.
&&

50

Hazardous weather outlook, May 11, 5:36 AM CDT, 9 hours 21 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSON MS
536 AM CDT TUE MAY 11 2004

ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025>066-072>074-
121036-
ADAMS-ASHLEY-ATTALA-BOLIVAR-CARROLL-CATAHOULA-CHICOT-CHOCTAW-
CLAIBORNE-CLARKE-CLAY-CONCORDIA-COPIAH-COVINGTON-EAST CARROLL-
FORREST-FRANKLIN LA-FRANKLIN MS-GRENADA-HINDS-HOLMES-HUMPHREYS-
ISSAQUENA-JASPER-JEFFERSON-JEFFERSON DAVIS-JONES-KEMPER-LAMAR-
LAUDERDALE-LAWRENCE-LEAKE-LEFLORE-LINCOLN-LOWNDES-MADISON LA-
MADISON MS-MARION-MONTGOMERY-MOREHOUSE-NESHOBA-NEWTON-NOXUBEE-
OKTIBBEHA-RANKIN-RICHLAND-SCOTT-SHARKEY-SIMPSON-SMITH-SUNFLOWER-
TENSAS-WARREN-WASHINGTON-WEBSTER-WEST CARROLL-WINSTON-YAZOO-
536 AM CDT TUE MAY 11 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL MISSISSIPPI...
NORTHEAST LOUISIANA...AND EXTREME SOUTHEAST ARKANSAS

.DAY ONE...TODAY AND TONIGHT...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER CALL TO ACTION STATEMENT...
THE ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND
EMERGENCY MANAGEMENT PERSONNEL IN SUPPORT OF SEVERE WEATHER
OPERATIONS...IS NOT ANTICIPATED THROUGH NEXT TUESDAY, MAY 18.

FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT
WWW.SRH.NOAA.GOV/JAN. THIS INCLUDES THE GRAPHICAL HAZARDOUS
WEATHER OUTLOOK.

In the hours before

Local storm report, May 11, 12:49 PM CDT, 2 hours 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSON MS
1249 PM CDT TUE MAY 11 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

1245 PM     HAIL             HATTIESBURG             31.31N 89.31W
05/11/2004  1.00 INCH        FORREST            MS   EMERGENCY MNGR

            REPORTED BY HATTIESBURG EOC OFFICE

&&

LJW

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 12:41 PM CDT	Severe Thunderstorm Warning	JAN	Forrest, Lamar	44 min
May 11, 2:23 PM CDT	Severe Thunderstorm Warning	JAN	Simpson	42 min
May 11, 4:26 PM CDT	Severe Thunderstorm Warning	JAN	Hinds	44 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2004 Every severe thunderstorm warning in 2004

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.