Alert archive / Mississippi / Flash Flood Warnings in 1991

Flash Flood Warning 49, NWS Jackson, MS

April 29, 1991Covington County, Forrest County, Lamar County, Mississippi

NWS Jackson, MS issued this flash flood warning at Apr 29, 1991, 4:57 PM CDT for Covington County, Forrest County, Lamar County, Mississippi. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Apr 29, 1991, 4:57 PM CDT (21:57 UTC)
Expired
Apr 29, 1991, 9:00 PM CDT
In force
4 hr
Issued by
NWS Jackson, MS
Area
Whole counties

Counties Covington County, MS, Forrest County, MS, Lamar County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.0 hours before the alert went out and 124 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, Slidell Radar S, LA at 12:00Z on 1991-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2664 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, Slidell Radar S, LA at 12:00Z on 1991-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 193 square meters per square second.193958Sfc1 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
2664 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
578 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
193 m²/s²
0-3 km storm-relative helicity
211 m²/s²
Significant tornado parameter
2.6
Supercell composite
12.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KJAN 292200 COR
FFWJAN
MSC127-129-031-065-077-091-147-035-073-113-300200-

BULLETIN - EBS ACTIVATION REQUESTED...CORRECTION TO WARNING
FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
457 PM CDT MON APR 29 1991

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A
FLOOD WARNING EFFECTIVE UNTIL  900 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN CENTRAL MISSISSIPPI

   ...SIMPSON COUNTY...SMITH COUNTY

IN SOUTH CENTRAL MISSISSIPPI

   ...COVINGTON COUNTY...JEFFERSON.DAVIS COUNTY...LAWRENCE COUNTY
   ...MARION COUNTY...WALTHALL COUNTY

IN SOUTHEAST MISSISSIPPI

   ...FORREST COUNTY...LAMAR COUNTY

IN SOUTHWEST MISSISSIPPI

   ...PIKE COUNTY

AT 455PM MORE SHOWERS AND THUNDERSTORMS WERE DEVELOPING
BETWEEN MCCOMB AND NEW ORLEANS AND WERE HEADING FOR SOUTHEAST
MISSISSIPPI.  ADDITIONAL HEAVY RAINFALL WILL CONTINUE AT LEAST
THROUGH THE EVENING HOURS AND ONLY AGGRAVATE ONGOING FLOODING
IN THESE AREAS.  SEVERAL ROADS IN JEFFERSON-DAVIS WERE COVERED
BY WATER AND PROBLEMS WERE DEVELOPING IN SIMPSON COUNTY AS WELL.

RAINFALL AMOUNTS OF 2 TO 4 INCHES HAVE FALLEN IN MUCH OF THESE
COUNTIES SINCE DAYBREAK AND MORE RAIN IS ON THE WAY WITH ANOTHER
2 TO 4 INCHES POSSIBLE BY EARLY TUESDAY.


DvO NOT DRIVE YOUR CAR INTO AREAS WHERE WATER COVERS THE ROAD.
THE WATER DEPTH MAY BE TOO DEEP TO ALLOW YOU TO CROSS SAFELY.
VEHICLES CAUGHT IN RISING WATER MUST BE ABANDONED QUICKLY.
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What forecasters said that day

The local office's own words before this flash flood 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, Apr 29, 11:31 AM CDT, 5 hours 26 minutes before
MSZ009-012-ALZ008-013-291730-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MERIDIAN MS
1129 AM CDT MON APR 29 1991

TORNADO WATCH NUMBER 237 IS NO LONGER IN EFFECT FOR CLARKE...JONES
AND WAYNE COUMTIES IN EAST CENTRAL MISSISIPPI AND CHOCTAW AND
SUMTER COUNTIES IN EXTREME WEST CENTRAL ALABAMA. HOWEVER TORNADO
WATCH NUMBER 237 REMAINS IN EFFECT FOR OTHER PARTS OF MISSISSIPPI
AND ALABAMA AND LOUISIANA.

A FLASH FLOOD WATCH REMAINS IN EFFECT TODAY FOR PARTS OF MISSISSIPPI
AND ALABAMA.

AT 1125 AM CDT RADAR INDICATED A LARGE AREA OF RAIN AND THUNDERSTORMS
OVER A LARGE PART OF MISSISSIPPI AND ALABAMA.

ALTHOUGH RADAR INDICATED THE THUNDERSTORMS OVER EAST CENTRAL
MISSISSIPPI AND EXT	REME WEST CENTRAL ALABAMA HAD DECREASED DURING
THE PAST HOUR ANY ADDITIONAL HEAVY RAINFALL WILL CAUSE FLOODING IN
THE AREA.
Special weather statement, Apr 29, 11:43 AM CDT, 5 hours 14 minutes before
MSZALL-ARZ014>016-LAZ002-003-004-006-009-010-013-
ALZ004-008-013-016-291625-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE JACKSON MS
 1125 AM CDT MON APR 29 1991

 TORNADO WATCH NUMBER 237 REMAINS IN EFFECT UNTIL 1 PM THIS MONDAY
AFTERNOON FOR A LARGE PORTION OF SOUTHEAST MISSISSIPPI.

AT 1125 AM CDT...NUMEROUS THUNDERSTORMS...WITH VERY HEAVY RAINFALL
CONTINUED FROM MERIDIAN SOUTH TO MC CLAIN MISSISSIPPI THEN WEST
TO BOGALUSA LOUISIANA.

SOME STREET FLOODING HAS BEEN REPORTED IN THE HATTIESBURG AREA.

THIS AREA WAS MOVING SOUTHEAST AT 15 MILES AN HOUR.

ELSEWHERE WIDELY SCATTERED THUNDERSTORMS...A FEW WITH HEAVY RAINFALL...
MIXED IN A LARGE AREA OF MOSTLY LIGHT RAIN COVERED MOST OF MISSISSIPPI
...WEST CENTRAL ALABAMA...AND EASTERN LOUISIANA.
 INDIVIDUAL THUNDERSTORMS WERE MOVING NORTHEAST AT 35 MILES AN HOUR.
Special weather statement, Apr 29, 12:36 PM CDT, 4 hours 21 minutes before
MSZALL-ARZ014>016-LAZ002-003-004-006-009-010-013-
ALZ004-008-013-016-291800-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE JACKSON MS
 1225 PM CDT MON APR 29 1991

 TORNADO WATCH NUMBER 237 REMAINS IN EFFECT FOR PORTIONS OF SOUTHEAST
MISSISSIPPI UNTIL 1 PM THIS MONDAY AFTERNOON...TORNADO WATCH NUMBER
239 HAS BEEN ISSUED FOR THE EXTREME SOUTHEAST CORNER OF SOUTHEAST
MISSISSIPPI UNTIL 8 PM THIS MONDAY EVENING.

AT 1225 PM CDT...WIDELY SCATTERED THUNDERSTORMS...A FEW WITH HEAVY
RAINFALL...MIXED IN A LARGE AREA OF MOSTLY LIGHT RAIN CONTINUED TO
COVER MOST OF MISSISSIPPI EXCEPT FOR THE EXTREME NORTHWEST COUNTIES.

THIS RAINFALL EXTENDED INTO MOST OF LOUISIANA...EXCEPT THE NORTHWEST
PORTION AND OVER MUCH OF SOUTHWEST ALABAMA.

THE STRONGER THUNDERSTORMS HAVE MOVED INTO INTERIOR SOUTHWEST ALABAMA.

 THE BACK EDGE OF THIS RO^UND OF RAINFALL WAS EVIDENT OVER NORTHEAST
AND CENTRAL LOUISIANA FROM RAYVILLE TO DRY PRONG.
Special weather statement, Apr 29, 1:35 PM CDT, 3 hours 22 minutes before
MSZALL-ARZ014>016-LAZ002-003-004-006-009-010-013-
ALZ004-008-013-016-300100-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE JACKSON MS
 126 PM CDT MON APR 29 1991

 TORNADO WATCH NUMBER 237 EXPIRED AT 1 PM...TORNADO WATCH NUMBER 239
REMAINS IN EFFECT UNTIL 8 PM THIS MONDAY EVENING FOR THE EXTREME
SOUTHEAST COUNTIES OF MISSISSIPPI.

AT 126 PM CDT...WIDELY SCATTERED THUNDERSTORMS...A FEW WITH HEAVY
RAINFALL...CONTINUED OVER MISSISSIPPI MIXED IN A LARGE AREA OF MOSTLY
LIGHT RAIN THAT COVERED ALL BUT THE EXTREME NORTHWEST COUNTIES OF
MISSISSIPPI.

THE RAINFALL EXTENDED WEST INTO NORTHEAST LOUISIANA AND THE EXTREME
SOUTHERN FRINGES OF EXTREME SOUTHEAST ARKANSAS AND OVER SOUTHWEST
ALABAMA AND MOST OF SOUTHEAST LOUISIANA.

THUNDERSTORMS WERE MORE NUMEROUS OVER EXTREME SOUTHEAST MISSISSIPPI
AND OVER SOUTHWEST ALABAMA.

MOVEMENT WAS NORTHEAST AT 45 MILES AN HOUR.
Special weather statement, Apr 29, 2:36 PM CDT, 2 hours 21 minutes before
MSZALL-ARZ014>016-LAZ002-003-004-006-009-010-013-
ALZ004-008-013-016-302000-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE JACKSON MS
 225 PM CDT MON APR 19 1991

 TORNADO WATCH NUMBER 239 FOR EXTREME SOUTHEAST MISSISSIPPI HAS BEEN
CANCELED...

AT 225 PM CDT...WIDELY SCATTERED THUNDERSTORMS...A FEW WITH HEAVY RAIN-
FALL...CONTINUED MIXED IN A LARGE AREA OF MOSTLY LIGHT RAIN THAT COVERED
MOST OF MISSISSIPPI...SOUTHWEST ALABAMA AND SOUTHEAST LOUISIANA.

THE HEAVIER RAINFALL WAS INDICATED ACROSS THE CENTRAL SECTIONS OF MISSISSIPPI
NORTH TO SOUTH FROM WESSON TO TYLERTOWN.

MOVEMENT WAS NORTHEAST AT 45 MILES AN HOUR.

A FEW THUNDERSTORMS WERE DEVELOPING OVER NORTH CENTRAL AND CENTRAL LOUISIANA.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 28, 7:07 PM CDTSevere Thunderstorm WarningJANAmite, Franklin38 min
Apr 28, 7:26 PM CDTSevere Thunderstorm WarningJANWilkinson49 min
Apr 28, 7:47 PM CDTSevere Thunderstorm WarningJANAmite28 min
Apr 28, 8:20 PM CDTSevere Thunderstorm WarningJANFranklin40 min
Apr 28, 9:13 PM CDTFlash Flood WarningJANHumphreys, Sharkey, Sunflower, Washington2 hr
Apr 28, 9:13 PM CDTFlash Flood WarningJANIssaquena2 hr
Apr 28, 9:13 PM CDTFlash Flood WarningJANBolivar2 hr
Apr 28, 9:13 PM CDTSevere Thunderstorm WarningJANBolivar, Humphreys, Sunflower, Washington2 hr
Apr 28, 9:13 PM CDTSevere Thunderstorm WarningJANIssaquena, Sharkey2 hr
Apr 28, 10:04 PM CDTFlash Flood WarningJANYazoo116 min
Apr 28, 10:04 PM CDTFlash Flood WarningJANLeflore, Tallahatchie116 min
Apr 28, 10:04 PM CDTSevere Thunderstorm WarningJANLeflore, Tallahatchie116 min
Apr 28, 10:04 PM CDTSevere Thunderstorm WarningJANYazoo116 min
Apr 28, 10:15 PM CDTSevere Thunderstorm WarningJANWarren60 min
Apr 28, 10:30 PM CDTFlash Flood WarningJANCarroll, Holmes2 hr
Apr 28, 10:30 PM CDTSevere Thunderstorm WarningJANCarroll, Holmes2 hr
Apr 28, 10:49 PM CDTTornado WarningJANYazoo26 min
Apr 28, 11:15 PM CDTFlash Flood WarningJANBolivar, Humphreys, Sunflower, Washington3 hr
Apr 28, 11:15 PM CDTFlash Flood WarningJANIssaquena, Sharkey3 hr
Apr 28, 11:45 PM CDTFlash Flood WarningJANWarren2 hr
Apr 28, 11:45 PM CDTSevere Thunderstorm WarningJANWarren2 hr
Apr 29, 12:02 AM CDTFlash Flood WarningJANWarren, Yazoo3 hr
Apr 29, 1:37 AM CDTFlash Flood WarningJANCarroll, Holmes, Leflore83 min
Apr 29, 1:48 AM CDTSevere Thunderstorm WarningJANAdams, Claiborne, Jefferson57 min
Apr 29, 1:48 AM CDTSevere Thunderstorm WarningJANWarren57 min
Apr 29, 1:59 AM CDTSevere Thunderstorm WarningJANHumphreys, Sharkey, Yazoo61 min
Apr 29, 2:16 AM CDTSevere Thunderstorm WarningJANCarroll, Holmes, Leflore44 min
Apr 29, 2:26 AM CDTFlash Flood WarningJANBolivar, Humphreys, Issaquena, Sharkey, Sunflower, Washington4 hr
Apr 29, 2:59 AM CDTSevere Thunderstorm WarningJANHinds, Madison61 min
Apr 29, 3:07 AM CDTFlash Flood WarningJANCarroll, Holmes, Leflore, Yazoo3 hr
Apr 29, 4:43 AM CDTFlash Flood WarningJANAttala3 hr
Apr 29, 3:05 PM CDTFlash Flood WarningJANCovington, Jefferson Davis115 min
Apr 29, 3:05 PM CDTFlash Flood WarningJANLawrence, Marion, Walthall115 min
Apr 29, 4:57 PM CDTFlash Flood WarningJANJefferson Davis, Lawrence, Marion, Simpson, Walthall4 hr
Apr 29, 4:57 PM CDTFlash Flood WarningJANSmith4 hr
Apr 29, 4:57 PM CDTFlash Flood WarningJANPike4 hr
Apr 29, 5:36 PM CDTFlash Flood WarningJANNeshoba3 hr

Nearby

Flash Flood Warnings in Mississippi, 1991Every flash flood warning in 1991

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.