655  
FNUS74 KLIX 181906  
FWSLIX  
 
SPOT FORECAST FOR ROSELAND EVENT...TANGIPAHOA PARISH EM  
NATIONAL WEATHER SERVICE NEW ORLEANS LA  
206 PM CDT SAT OCT 18 2025  
 
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
WE CAN BE REACHED AT (985) 649-0357 IF YOU HAVE QUESTIONS OR CONCERNS  
WITH THIS FORECAST.  
   
DISCUSSION  
 
HIGH PRESSURE HAS MOVED EAST OF THE AREA WITH RELATIVE HUMIDITIES  
MODERATING. MINIMUM RH VALUES WILL LIKELY BE AROUND 60 PERCENT FOR  
MOST OF THE AREA TODAY. A COLD FRONT IS EXPECTED TO MOVE THROUGH  
THE AREA LATE TONIGHT INTO SUNDAY MORNING. SHOWERS AND  
THUNDERSTORMS ARE EXPECTED TO ACCOMPANY THE FRONT, BUT AREAL  
AVERAGE RAINFALL AMOUNTS ARE EXPECTED TO REMAIN BELOW ONE INCH  
ACROSS MOST OR ALL OF THE AREA. DRIER WEATHER IS AGAIN EXPECTED  
BEHIND THIS FRONTAL PASSAGE, WITH MINIMUM RH VALUES NEAR  
40 PERCENT SUNDAY AFTERNOON. MONDAY HAS THE LOWEST POTENTIAL  
MIN RH VALUES WITH LIT REACHING THE LOW 30S TO POSSIBLY CRITICAL  
VALUES.  
 
   
REST OF TODAY  
 
SKY/WEATHER.........MOSTLY SUNNY (45-55 PERCENT). SLIGHT CHANCE OF  
SHOWERS LATE IN THE AFTERNOON. SLIGHT CHANCE OF  
THUNDERSTORMS THROUGH THE DAY. CHANCE OF  
SHOWERS LATE IN THE AFTERNOON.  
CHANCE OF PCPN......50 PERCENT.  
MAX TEMPERATURE.....AROUND 86.  
MIN HUMIDITY........63 PERCENT.  
MAX APPARENT TEMP...92.  
SURFACE WINDS (MPH).SOUTH WINDS 14 TO 16 MPH.  
MIXING HEIGHT (M)...1036-1250 METERS AGL.  
TRANSPORT WINDS.....SOUTH 16 TO 17 MPH.  
TRANSPORT WINDS M/S.SOUTH 7 TO 8 METERS/SECOND.  
CEILING (KFT).......8.5 INCREASING TO 9.5 LATE IN THE AFTERNOON.  
WIND (20 FT)........SOUTH WINDS 12 TO 14 MPH. GUSTY AND ERRATIC  
WINDS EXPECTED NEAR THUNDERSTORMS.  
 
TIME (CDT) 3PM 4PM 5PM  
SKY (%).........38 59 62  
WEATHER COV.....SCH CHC CHC  
WEATHER TYPE....RW RW RW  
TSTM COV........SCH SCH SCH  
CHC OF PCPN (%).20 30 50  
TEMP............86 84 83  
RH..............63 65 67  
APARNT TMP (F)..92 89 88  
20 FT WIND DIR..S SSE SSE  
20 FT WIND SPD..16 15 14  
20 FT WIND GUST.23 22 22  
SURFACE WND DIR.S SSE SSE  
SURFACE WND SPD.16 15 14  
SURFACE WND GST.23 22 22  
MIX HGT (KM)....1.2 1.0 1.0  
TRANSP WIND DIR.S S S  
TRANSP WIND SPD.16 17 17  
TRANS WIND DIR..S S S  
TRANS SPD (M/S).7 8 8  
CEILING (KFT)...8.5 8.5 9.5  
   
TONIGHT  
 
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT). SHOWERS LIKELY  
IN THE EVENING. CHANCE OF THUNDERSTORMS THROUGH  
THE NIGHT. SHOWERS OVERNIGHT.  
CHANCE OF PCPN......90 PERCENT.  
MIN TEMPERATURE.....AROUND 68.  
MAX HUMIDITY........100 PERCENT.  
MAX APPARENT TEMP...85.  
SURFACE WINDS (MPH).SOUTHWEST WINDS 6 TO 14 MPH SHIFTING TO THE  
WEST AROUND 7 MPH AFTER 3 AM.  
MIXING HEIGHT (M)...183-1036 METERS AGL.  
TRANSPORT WINDS.....SOUTH 13 TO 17 MPH SHIFTING TO THE WEST AROUND  
9 MPH AFTER 3 AM.  
TRANSPORT WINDS M/S.SOUTH AROUND 8 METERS/SECOND SHIFTING TO THE  
WEST AROUND 4 METERS/SECOND AFTER 3 AM.  
CEILING (KFT).......8.5 DECREASING TO 5.8 EARLY IN THE EVENING,  
THEN INCREASING TO 9.5 EARLY IN THE EVENING  
DECREASING TO 5.8 LATE IN THE EVENING  
DECREASING TO 3.5 DECREASING TO 1.8 OVERNIGHT  
DECREASING TO 0.7 DECREASING TO 0.5 AFTER 3 AM  
DECREASING TO 0.3.  
WIND (20 FT)........SOUTH WINDS 5 TO 12 MPH SHIFTING TO THE WEST  
AROUND 6 MPH AFTER 3 AM. GUSTY AND ERRATIC  
WINDS EXPECTED NEAR THUNDERSTORMS EARLY IN THE  
EVENING. GUSTY AND ERRATIC WINDS EXPECTED NEAR  
THUNDERSTORMS IN THE LATE EVENING AND  
OVERNIGHT. GUSTY AND ERRATIC WINDS EXPECTED  
NEAR THUNDERSTORMS AFTER 3 AM.  
 
TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........63 77 70 70 72 62 69 81 62 79 80 66  
WEATHER COV.....LKY CHC CHC CHC CHC CHC LKY DEF DEF DEF CHC SCH  
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW  
TSTM COV........SCH CHC CHC CHC CHC CHC CHC SCH SCH  
CHC OF PCPN (%).60 50 50 40 40 40 60 80 90 80 50 20  
TEMP............81 77 74 74 73 73 72 73 71 71 71 70  
RH..............74 85 93 93 100 97 100 97 100 100 100 100  
APARNT TMP (F)..85 77 74 74 73 73 72 73 71 71 71 70  
20 FT WIND DIR..S SSE SSE S S S S S SW WSW WSW W  
20 FT WIND SPD..14 10 12 10 10 9 7 6 6 7 7 7  
20 FT WIND GUST.22 20 20 20 18 18 17 15 16 16 15 15  
SURFACE WND DIR.S SSE SSE S S S S S SW WSW WSW W  
SURFACE WND SPD.14 10 12 10 10 9 7 6 6 7 7 7  
SURFACE WND GST.22 20 20 20 18 18 17 15 16 16 15 15  
MIX HGT (KM)....1.0 0.3 0.3 0.3 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2  
TRANSP WIND DIR.S S S S S S S SW SW SW W W  
TRANSP WIND SPD.17 13 13 13 15 15 15 14 14 14 9 9  
TRANS WIND DIR..S S S S S S S SW SW SW W W  
TRANS SPD (M/S).8 6 6 6 7 7 7 6 6 6 4 4  
CEILING (KFT)...8.5 5.8 9.5 5.8 5.8 3.5 3.5 1.8 1.8 0.7 0.5 0.3  
   
SUNDAY  
 
SKY/WEATHER.........SUNNY (20-30 PERCENT).  
CHANCE OF PCPN......10 PERCENT.  
MAX TEMPERATURE.....AROUND 81.  
MIN HUMIDITY........45 PERCENT.  
MAX APPARENT TEMP...79.  
SURFACE WINDS (MPH).NORTH WINDS 7 TO 16 MPH SHIFTING TO THE 14 TO  
16 MPH LATE IN THE AFTERNOON.  
MIXING HEIGHT (M)...152-1250 METERS AGL.  
TRANSPORT WINDS.....NORTHWEST 9 TO 15 MPH SHIFTING TO THE NORTH 16  
TO 20 MPH IN THE LATE MORNING AND AFTERNOON.  
TRANSPORT WINDS M/S.NORTH 7 TO 9 METERS/SECOND.  
CEILING (KFT).......0.2 INCREASING TO 25.  
WIND (20 FT)........NORTHWEST WINDS 6 TO 14 MPH SHIFTING TO THE  
NORTH 12 TO 14 MPH LATE IN THE AFTERNOON.  
 
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........43 31 21 14 46 31 27 10 8 4 5 4  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CHC OF PCPN (%).0 10 0 0 0 0 0 0 0 0 0 0  
TEMP............70 69 68 70 73 75 78 79 78 79 77 76  
RH..............100 100 100 100 87 76 62 54 50 45 45 45  
APARNT TMP (F)..70 69 68 70 73 75 78 79 78 79 77 76  
20 FT WIND DIR..WNW NW NW NNW NNW NNW NNW NNW NNW N N N  
20 FT WIND SPD..7 7 10 13 14 15 15 15 16 16 15 14  
20 FT WIND GUST.15 15 16 18 18 18 21 20 23 23 22 21  
SURFACE WND DIR.WNW NW NW NNW NNW NNW NNW NNW NNW N N N  
SURFACE WND SPD.7 7 10 13 14 15 15 15 16 16 15 14  
SURFACE WND GST.15 15 16 18 18 18 21 20 23 23 22 21  
MIX HGT (KM)....0.2 0.2 0.2 0.2 0.7 0.7 0.7 1.2 1.2 1.2 1.2 1.2  
TRANSP WIND DIR.W NW NW NW N N N N N N N N  
TRANSP WIND SPD.9 15 15 15 20 20 20 20 20 20 16 16  
TRANS WIND DIR..W NW NW NW N N N N N N N N  
TRANS SPD (M/S).4 7 7 7 9 9 9 9 9 9 7 7  
CEILING (KFT)...0.2 0.2 0.2 1.8 25 25 25 25 25 25 25 25  
 
 
FORECASTER...LIM  
REQUESTED BY...DAWSON PRIMES  
TYPE OF REQUEST...HAZMAT  
.TAG 2523508.5/LIX  
.DELDT 10/18/25  
.FORMATTERVERSION 2.0.0  
.EMAIL SCHROEDER.HOPE@EPA.GOV,SR-LIX.FORECASTERS@NOAA.GOV,DAWSON.PRIMES@TANGIPAHOA.ORG,VTRAVIS@TANGIPAHOA.ORG  
CLICK HERE TO GO TO PREVIOUS BULLETINS.
The Nexlab LA Page
The Nexlab MS Page
Main Text Page