Fire Weather Point Forecast Matrices
Issued by NWS New Orleans/Baton Rouge, LA
Issued by NWS New Orleans/Baton Rouge, LA
268
FOUS54 KLIX 060916
PFWLIX
Fire Weather Point Forecast Matrices
National Weather Service New Orleans LA
416 AM CDT Sun Apr 6 2025
LAZ080-062100-
Big Branch-South Western St Tammany Parish LA-Elev 3 ft
30.27N 89.90W Elev. 3 ft
416 AM CDT Sun Apr 6 2025
Date Sun 04/06/25 Mon 04/07/25 Tue 04/08/25
UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00
CDT 3hrly 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19
Max/Min 77 53 65 45 73
Temp 72 74 75 75 69 63 59 57 55 57 63 64 59 54 51 49 47 59 69 72 66
Dewpt 72 72 71 68 65 60 56 54 51 51 50 48 47 46 45 43 42 44 44 44 47
Min/Max RH 76 93 57 84 37
RH 99 95 85 78 86 90 91 91 88 81 62 57 63 75 79 79 84 57 40 37 50
Wind Dir S W W W NW NW NW N N N NW NW N N N N N N N N N
Wind Spd 8 8 8 6 4 4 4 4 4 6 8 8 6 4 4 4 3 4 5 5 3
Clouds OV OV B2 B2 B2 B2 B2 OV OV B2 B1 B1 SC SC FW CL FW CL CL CL FW
Clouds(%) 94 91 87 79 72 82 73 88 92 83 66 56 44 32 9 4 7 3 4 5 9
Visibility 4 4 6 6 5 7 10 10 10 8 10 10
PoP 12hr 100 60 30 0 0
QPF 12hr 1.17 0.03 0.02 0 0
Rain Showers L D L C C C C S C C
Tstms L L L C C C S S
Mix Hgt 1300 1800 1900 2000 2200 4300 2700 500 3100 6800
Trans Wind Dir SW NW N N N NW N N N N
Trans Wind Spd 18 12 17 16 14 18 13 11 11 12
ADI 27 23 12 30 48 53 25 13 42 44
Max LVORI 5 5 5 5 4 2 4 4 4 1
Stability C C E D C C F F B B
Date Wed 04/09/25Thu 04/10/25Fri 04/11/25Sat 04/12/25
UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00
CDT 6hrly 01 07 13 19 01 07 13 19 01 07 13 19 01 07 13 19
Min/Max 48 74 51 78 57 79 53 77
Temp 55 49 70 68 59 56 75 73 64 60 77 72 59 54 74 71
Dewpt 45 43 46 49 52 51 54 57 58 56 53 51 49 48 50 52
Max/Min RH 81 39 85 45 88 39 82 39
RH 68 78 42 51 78 83 48 57 81 87 43 48 69 79 43 51
Wind Dir N NE S S S SW SW SW W NW NW N N N NW NW
Wind Spd 3 3 3 2 2 1 3 2 3 3 5 3 3 2 3 3
Avg Clouds CL CL CL CL CL CL FW CL FW FW FW FW CL FW FW CL
PoP 12hr 0 0 0 0 5 0 0 0
$$
MSZ080-062100-
Hancock-Northern Hancock County MS-Elev 98 ft
30.45N 89.45W Elev. 98 ft
416 AM CDT Sun Apr 6 2025
Date Sun 04/06/25 Mon 04/07/25 Tue 04/08/25
UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00
CDT 3hrly 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19
Max/Min 77 53 63 42 71
Temp 72 74 75 74 69 64 60 57 54 55 60 62 58 53 50 47 44 58 67 70 64
Dewpt 72 73 72 70 66 61 56 54 51 50 50 48 46 45 44 42 41 44 43 44 46
Min/Max RH 81 92 59 90 37
RH 100 98 90 86 89 91 88 91 89 83 69 59 64 74 80 84 88 58 41 39 51
Wind Dir S S SW W NW NW NW NW NW NW NW NW N N NW NW N N N N N
Wind Spd 10 10 9 8 4 4 4 5 6 8 8 9 6 4 4 3 3 5 8 6 3
Clouds OV OV OV OV B2 B2 B2 B2 OV OV B2 SC SC SC FW CL FW CL CL CL FW
Clouds(%) 94 91 90 88 83 83 82 84 94 91 76 49 46 33 11 3 6 3 4 4 10
Visibility 4 4 5 5 5 6 7 10 10 7 10 10
PoP 12hr 100 60 40 0 0
QPF 12hr 1.68 0.07 0.03 0 0
Rain Showers L D D L C C C S C C
Tstms L L D L C C S S
Mix Hgt 1600 1400 1700 1600 2000 4300 1700 400 3400 6900
Trans Wind Dir S W NW N N N N N N N
Trans Wind Spd 19 12 14 14 13 17 12 9 12 12
ADI 33 20 11 25 44 50 19 11 46 46
Max LVORI 5 5 5 6 4 2 5 5 4 1
Stability C C E D C C F F B B
Date Wed 04/09/25Thu 04/10/25Fri 04/11/25Sat 04/12/25
UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00
CDT 6hrly 01 07 13 19 01 07 13 19 01 07 13 19 01 07 13 19
Min/Max 45 74 47 79 55 77 49 76
Temp 52 46 70 66 55 51 75 71 61 58 75 70 57 51 73 70
Dewpt 43 40 44 51 50 49 53 56 56 55 50 48 47 45 47 50
Max/Min RH 85 37 97 42 94 37 83 37
RH 72 81 39 57 83 94 45 58 84 90 41 46 69 80 40 48
Wind Dir N NE SE S S N SW S SW NW NW NW N N N NW
Wind Spd 2 2 2 2 1 0 4 3 2 3 6 4 2 2 4 3
Avg Clouds FW CL CL CL CL CL CL CL FW FW FW FW CL FW FW CL
PoP 12hr 0 0 0 0 5 0 0 0
$$
MSZ082-062100-
Sandhill Crane-South Central Jackson County MS-Elev 25 ft
30.45N 88.66W Elev. 25 ft
416 AM CDT Sun Apr 6 2025
Date Sun 04/06/25 Mon 04/07/25 Tue 04/08/25
UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00
CDT 3hrly 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19
Max/Min 80 54 65 44 72
Temp 74 77 79 78 73 68 64 60 56 58 61 64 60 54 51 48 46 60 68 71 66
Dewpt 72 74 72 72 70 66 61 57 55 53 52 50 48 47 46 44 42 44 44 45 47
Min/Max RH 79 98 60 89 39
RH 93 90 79 82 89 93 90 90 96 83 72 60 66 77 83 86 86 55 42 39 50
Wind Dir S S S SW W NW NW NW NW NW NW NW NW N N N N N N N N
Wind Spd 12 13 14 11 8 5 5 6 8 8 8 9 8 6 5 5 4 8 8 8 4
Clouds OV OV B2 B2 OV B2 OV OV OV B2 B2 B1 SC SC FW FW FW CL CL CL FW
Clouds(%) 97 89 81 85 92 82 94 92 90 87 81 60 48 37 18 8 8 3 3 2 7
Visibility 6 5 2 3 2 3 4 10 2 5 10 10
PoP 12hr 90 80 60 0 0
QPF 12hr 0.78 0.65 0.12 0 0
Rain Showers C L D D D D L L L L S S
Tstms C C L L D C C S C
Mix Hgt 2200 2200 1300 1400 1800 4100 1700 400 3300 7000
Trans Wind Dir S SW NW N N NW N N N N
Trans Wind Spd 27 24 13 14 14 17 14 10 12 12
ADI 60 59 11 27 32 48 18 13 45 45
Max LVORI 4 5 6 5 4 3 5 5 4 1
Stability D C D D C C F F B B
Date Wed 04/09/25Thu 04/10/25Fri 04/11/25Sat 04/12/25
UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00
CDT 6hrly 01 07 13 19 01 07 13 19 01 07 13 19 01 07 13 19
Min/Max 46 72 49 76 56 78 51 76
Temp 53 47 70 65 58 53 75 70 63 60 77 71 59 53 73 70
Dewpt 44 42 44 49 50 49 53 56 58 56 53 50 48 46 47 50
Max/Min RH 85 38 89 45 90 40 80 37
RH 71 81 40 56 76 86 46 61 83 87 43 47 67 77 40 48
Wind Dir N NE SE S S N S SW W NW NW NW N N N NW
Wind Spd 4 3 3 3 1 2 5 4 3 4 6 5 3 3 5 3
Avg Clouds FW FW CL CL CL CL CL CL FW SC SC FW CL FW FW CL
PoP 12hr 0 0 0 0 5 0 0 0
$$
MSZ082-062100-
Grand Bay-Southeast Jackson County MS-Elev 7 ft
30.44N 88.42W Elev. 7 ft
416 AM CDT Sun Apr 6 2025
Date Sun 04/06/25 Mon 04/07/25 Tue 04/08/25
UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00
CDT 3hrly 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19
Max/Min 79 54 64 44 71
Temp 74 77 78 78 74 68 64 60 56 57 60 63 58 54 51 48 46 59 66 70 64
Dewpt 72 74 73 73 71 66 62 58 55 54 53 51 50 47 46 44 42 45 45 46 48
Min/Max RH 82 100 65 89 42
RH 93 90 85 85 90 93 93 93 96 90 78 65 75 77 83 86 86 60 47 42 56
Wind Dir S S S S SW NW NW NW NW NW NW NW NW N N N N N N N N
Wind Spd 10 12 13 11 6 5 4 5 6 8 8 8 6 5 4 4 4 6 8 6 4
Clouds B2 B2 B2 B2 OV B2 OV OV OV OV B2 B1 SC SC FW FW FW CL CL CL FW
Clouds(%) 83 87 80 87 94 84 95 89 92 92 85 67 48 38 17 9 9 3 3 2 7
Visibility 5 9 3 3 3 4 4 7 2 5 9 10
PoP 12hr 90 90 70 0 0
QPF 12hr 0.71 0.81 0.14 0 0
Rain Showers C C L D D D D L L L C C
Tstms C C L L D C C C C
Mix Hgt 1800 2400 1300 1300 1600 3700 1300 400 2900 7000
Trans Wind Dir S SW NW N N NW N N N N
Trans Wind Spd 27 25 13 14 14 17 14 10 12 12
ADI 61 61 11 27 32 46 14 11 45 45
Max LVORI 4 5 6 6 4 3 5 6 4 1
Stability C C D D C C F F B B
Date Wed 04/09/25Thu 04/10/25Fri 04/11/25Sat 04/12/25
UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00
CDT 6hrly 01 07 13 19 01 07 13 19 01 07 13 19 01 07 13 19
Min/Max 46 71 48 75 56 77 50 75
Temp 53 47 68 64 56 52 73 68 62 59 76 69 57 52 71 68
Dewpt 44 42 45 50 50 49 54 56 58 56 54 52 49 47 47 51
Max/Min RH 86 41 93 50 93 42 83 38
RH 71 83 44 60 80 89 51 65 87 90 46 55 75 83 42 55
Wind Dir N NE E S S N S SW W NW NW NW N N N NW
Wind Spd 3 3 3 2 1 2 5 3 3 3 6 4 3 3 4 3
Avg Clouds FW FW CL CL CL CL CL CL FW SC SC FW FW FW FW CL
PoP 12hr 0 0 0 0 5 0 0 0
$$
MSZ070-062100-
Pike-Northern Pike County MS-Elev 366 ft
31.19N 90.48W Elev. 366 ft
416 AM CDT Sun Apr 6 2025
Date Sun 04/06/25 Mon 04/07/25 Tue 04/08/25
UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00
CDT 3hrly 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19
Max/Min 69 48 60 40 69
Temp 66 64 67 67 61 57 54 51 50 52 58 59 55 50 46 44 42 58 66 69 63
Dewpt 66 62 62 59 54 52 50 48 46 46 45 43 42 41 40 39 39 43 43 42 43
Min/Max RH 73 89 55 93 37
RH 99 92 83 74 78 83 86 89 86 79 62 55 61 71 78 82 89 57 43 37 49
Wind Dir W NW NW NW NW NW N N NW NW NW NW N N N N NW N N N N
Wind Spd 8 5 6 8 5 5 5 5 5 8 9 9 6 4 3 3 3 4 6 6 3
Clouds OV B2 B2 B2 OV B2 B2 OV OV B2 B2 B1 SC FW CL CL CL CL CL FW FW
Clouds(%) 93 83 87 83 90 87 83 90 91 77 76 61 37 14 5 2 5 3 3 6 6
Visibility 6 5 9 7 9 10 10 10 9 10 10 10
PoP 12hr 70 20 10 0 0
QPF 12hr 0.12 0 0 0 0
Rain Showers L C C S
Tstms C C S
Tornado
Mix Hgt 1200 2100 1800 2000 2500 4600 1600 400 3000 6200
Trans Wind Dir NW NW N N N N N N N N
Trans Wind Spd 11 12 16 14 16 19 12 9 10 12
ADI 17 27 18 28 49 58 7 10 37 42
Max LVORI 5 4 5 5 4 3 4 6 4 1
Stability C C D D C C F F B B
Date Wed 04/09/25Thu 04/10/25Fri 04/11/25Sat 04/12/25
UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00
CDT 6hrly 01 07 13 19 01 07 13 19 01 07 13 19 01 07 13 19
Min/Max 43 73 47 79 54 75 49 75
Temp 48 44 70 67 53 49 75 72 60 56 73 67 54 51 72 68
Dewpt 41 40 44 48 46 48 53 55 54 52 48 47 45 45 47 49
Max/Min RH 86 35 95 42 90 37 83 37
RH 77 86 39 50 77 95 46 55 80 86 41 49 71 80 41 51
Wind Dir N E S S S S SW SW W NW N N N N N NW
Wind Spd 2 2 3 2 2 2 5 2 3 3 6 3 2 2 4 3
Avg Clouds CL CL CL CL CL CL CL FW FW FW FW CL CL CL FW CL
PoP 12hr 0 0 0 5 5 0 0 0
$$
MSZ082-062100-
Vancleave-Northern Jackson County MS-Elev 125 ft
30.62N 88.71W Elev. 125 ft
416 AM CDT Sun Apr 6 2025
Date Sun 04/06/25 Mon 04/07/25 Tue 04/08/25
UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00
CDT 3hrly 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19
Max/Min 78 53 63 43 72
Temp 73 76 77 77 72 66 62 58 55 57 60 62 58 54 51 47 46 59 68 70 64
Dewpt 72 74 72 72 68 64 61 56 54 52 52 48 47 46 45 43 42 44 43 44 46
Min/Max RH 82 97 60 89 38
RH 97 94 85 85 87 93 97 93 96 83 75 60 67 74 80 86 86 57 40 39 52
Wind Dir S S S SW W NW NW NW NW NW NW NW NW NW NW N N N N N N
Wind Spd 11 12 12 9 5 4 4 5 6 8 8 8 6 5 4 4 4 5 6 6 4
Clouds OV B2 B2 B2 OV B2 OV B2 OV B2 B2 B1 SC SC FW FW CL CL CL CL FW
Clouds(%) 92 85 87 82 89 73 92 78 92 87 78 60 42 40 13 6 5 3 3 2 7
Visibility 6 2 2 3 3 4 5 10 4 6 10 10
PoP 12hr 90 80 50 0 0
QPF 12hr 1.32 0.39 0.10 0 0
Rain Showers C D D D D L L L C C S S
Tstms C L D D D C C S C
Mix Hgt 2000 2100 1300 1300 1900 4100 1700 500 3500 7000
Trans Wind Dir S SW NW N N NW N N N N
Trans Wind Spd 25 20 13 14 13 17 13 9 12 12
ADI 53 52 11 23 36 48 17 11 46 46
Max LVORI 4 5 6 6 5 3 5 6 4 1
Stability C C D D C C F F B B
Date Wed 04/09/25Thu 04/10/25Fri 04/11/25Sat 04/12/25
UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00
CDT 6hrly 01 07 13 19 01 07 13 19 01 07 13 19 01 07 13 19
Min/Max 44 73 47 77 55 78 49 76
Temp 52 46 70 65 56 50 75 70 61 58 77 70 57 52 73 69
Dewpt 43 40 43 50 50 48 52 56 57 55 51 49 47 45 46 49
Max/Min RH 83 35 96 42 93 37 80 36
RH 71 79 38 58 80 93 45 61 87 90 40 47 69 77 38 49
Wind Dir N NE SE S S N S S W NW NW NW N N N NW
Wind Spd 3 3 3 2 1 1 5 3 2 3 6 4 3 2 4 3
Avg Clouds FW CL CL CL CL CL CL CL FW FW FW FW CL FW FW CL
PoP 12hr 0 0 0 0 10 0 0 0
$$
MSZ081-062100-
Camp Keller-Northern Harrison County MS-Elev 130 ft
30.52N 88.98W Elev. 130 ft
416 AM CDT Sun Apr 6 2025
Date Sun 04/06/25 Mon 04/07/25 Tue 04/08/25
UTC 3hrly 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00
CDT 3hrly 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19
Max/Min 77 53 63 44 72
Temp 73 76 76 76 72 66 62 59 55 57 61 63 59 54 51 49 47 60 68 70 66
Dewpt 72 73 72 70 67 64 59 56 53 51 50 48 46 45 44 43 42 42 42 43 44
Min/Max RH 82 96 58 86 37
RH 97 90 87 82 84 93 90 90 93 80 67 58 62 71 77 80 83 51 39 38 45
Wind Dir S S S SW NW NW NW NW NW NW NW NW NW N N N N N N N N
Wind Spd 13 13 13 11 6 5 6 8 8 8 9 9 8 8 5 5 4 8 8 8 4
Clouds OV OV OV B2 B2 B2 B2 B2 OV B2 B2 B1 SC SC FW CL CL CL CL CL FW
Clouds(%) 94 91 90 84 80 83 85 85 92 87 84 59 43 43 16 3 4 4 4 3 7
Visibility 5 3 3 5 4 5 5 10 7 7 10 10
PoP 12hr 90 80 50 0 0
QPF 12hr 1.29 0.30 0.08 0 0
Rain Showers C D D L D L C C C C S S
Tstms C L D L L C S S C
Mix Hgt 1400 1600 1300 1500 1900 4200 2500 400 3400 7200
Trans Wind Dir S SW NW N N N N N N N
Trans Wind Spd 25 18 14 16 13 17 16 10 12 12
ADI 41 41 19 26 36 49 25 11 45 45
Max LVORI 5 5 5 5 4 3 4 5 3 1
Stability D C D D C C F F B B
Date Wed 04/09/25Thu 04/10/25Fri 04/11/25Sat 04/12/25
UTC 6hrly 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00
CDT 6hrly 01 07 13 19 01 07 13 19 01 07 13 19 01 07 13 19
Min/Max 46 72 48 77 57 78 51 75
Temp 53 47 70 66 58 53 75 70 63 60 77 71 59 53 73 70
Dewpt 43 40 43 49 50 49 52 54 57 56 50 48 47 46 45 49
Max/Min RH 77 35 89 43 90 36 77 34
RH 69 76 38 54 75 86 45 57 81 87 39 44 64 77 37 47
Wind Dir N NE SE S S N S S W NW NW NW N N N NW
Wind Spd 4 3 3 3 2 2 5 4 3 4 6 5 3 3 5 4
Avg Clouds CL CL CL CL CL CL CL CL FW FW FW FW CL CL FW CL
PoP 12hr 0 0 0 0 10 0 0 0
$$
This product is for planning and review purposes only and
is not to be substituted for an official fire weather spot
forecast. The data displayed are caculated from a 2.5 by
2.5 km digital database and only approximate weather conditions
in highly varying terrain. Please relay any comments you have to
the NWS via email at sr-lix.webmaster@noaa.gov.
Below is a weather element key for this product.
(Note: Winds do not reflect local terrain effects.)
Day 1 through 3...
Max/Min temp or Min/Max temp(F).....Maximum/Minimum Air Temperature
Temp(F).............................Air Temperature
Dewpt(F)............................Dew Point Temperature
Min/Max RH or Max/Min RH(%).........Maximum/Minimum Humidity
RH(%)...............................Relative Humidity
Wind Dir(8 point compass)...........20 ft. Wind Direction
Wind Dir Deg(degrees)...............20 ft. Wind Direction in Tens of Degrees
relative to due north.
Example: 09 = 90 degrees = east; 18 = 180 degrees = south;
27 = 270 degrees = west; 36 = 360 degrees = north
Wind Spd(mph).......................20 ft. Wind Speed
Wind Gust(mph)......................20 ft. Wind Gust
Wind Chill..........................Wind Chill Temperature
Heat Indx...........................Heat Index
Clouds(cat).........................Cloud Cover Category
Example: CL = clear; FW = few; SC = scattered;
B1 = mostly cloudy; B2 = considerable clouds; OV = overcast
Clouds(%)...........................Cloud Cover as a Percentage
Visibility..........................Visibility Value in Statute Miles
PoP 12hr(%).........................Probability of Accumulating Precipitation
QPF 12hr(in)........................Liquid Equivalent Precipitation Amount
Weather...
Type...
Rain...........Rain
Rain Shwrs.....Rain Showers
Tstms..........Thunderstorms
Drizzle........Drizzle
Snow...........Snow
Snow Shwrs.....Snow Showers
Sleet..........Sleet
Flurries.......Flurries
Frzg Rain......Freezing Rain
Frzg Drzl......Freezing Drizzle
Coverage...
S..............Slight Chance
C..............Chance
L..............Likely
O..............Occasional
D..............Definite
AR.............Areas
PA.............Patchy
Obvis...............................Obstruction to Visibility
Type...
F..............Fog
PF.............Patchy Fog
F+.............Dense Fog
H..............Haze
BS.............Blowing Snow
K..............Smoke
BD.............Blowing Dust
AF.............Volcanic Ashfall
DSI (cat)...........................Davis Stability Index
Mix Hgt(ft AGL).....................Mixing Height
T wind dir(8 point compass).........Transport Wind Direction
T wind spd(mph).....................Transport Wind Speed
ADI (index).........................Atmospheric Dispersion Index
Ceiling (ft)........................Ceiling
LVORI (index).......................Low Visibility Occurrence Risk Index
Stability (cat).....................Pasquill Turner Stability
Watch/Warning/Advisory...
Example: W = Warning; Y = Advisory; A = Watch
in effect for the indicated hour
Day 4 through 7...
Max/Min temp or Min/Max temp(F).....Maximum/Minimum Air Temperature
Temp(F).............................Air Temperature
Dewpt(F)............................Dew Point Temperature
RH(%)...............................Relative Humidity
Wind dir............................20 ft. Wind Direction
Wind spd(mph).......................20 ft. Wind Speed
Avg clouds(cat).....................Average Cloud Cover Category
PoP 12hr(%).........................Probability for Accumulating Precipitation
Weather...
See day 1 through 3 weather descriptions