National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Weather observations for the past three days for
Chester County Airport
Imperial (Metric)
Date Time (edt) Wind (mph) Vis. (mi.) Weather Sky Cond. Temperature (ºF) Relative Humidity Wind Chill (°F) Heat Index (°F) Pressure Precipitation (in)
Air Dwpt 6 hour altimeter (in) sea level (mb) 1 hr 3 hr 6 hr
Max. Min.
14 15:55 NW 18 G 24 10.00 Overcast FEW036 OVC046 57.4 42.4 58% 29.8 0.0
14 15:35 NW 13 G 22 10.00 Overcast OVC041 57.7 43 58% 29.8 0.0
14 15:15 NW 17 10.00 Overcast OVC039 56.8 41.7 57% 29.8 0.0
14 14:55 NW 16 G 20 10.00 Overcast BKN035 OVC043 57 43 60% 29.79 0.0
14 14:35 NW 13 10.00 Overcast BKN037 OVC090 56.7 43.3 61% 29.8 0.0
14 14:15 NW 12 10.00 Overcast OVC037 57.6 44.6 62% 29.8 0.0
14 13:55 NW 14 G 21 10.00 Overcast BKN038 OVC090 57.7 42.4 59.7 51.1 57% 29.79 0.0
14 13:35 NW 14 G 21 10.00 Mostly Cloudy SCT040 BKN090 58.8 43.3 57% 29.8 0.0
14 13:15 NW 16 G 23 10.00 Mostly Cloudy BKN040 58.6 43.9 58% 29.8 0.0
14 12:55 NW 18 G 23 10.00 Partly Cloudy SCT038 59 43.7 57% 29.8 0.0
14 12:35 NW 18 10.00 Mostly Cloudy BKN040 BKN360 59.4 45 59% 29.8 0.0
14 12:15 NW 16 G 20 10.00 Mostly Cloudy BKN037 57.4 44.1 61% 29.8 0.0
14 11:55 NW 13 G 18 10.00 Mostly Cloudy BKN036 BKN043 56.7 44.6 64% 29.81 0.0
14 11:35 NW 13 10.00 Mostly Cloudy FEW031 BKN042 58.3 46.6 65% 29.81 0.0
14 11:15 NW 7 10.00 Mostly Cloudy BKN030 BKN044 57 45.3 65% 29.81 0.0
14 10:55 NW 14 10.00 Mostly Cloudy BKN029 BKN090 56.3 45.1 66% 29.81 0.0
14 10:35 NW 12 10.00 Overcast SCT029 OVC090 55.6 46.4 71% 29.81 0.0
14 10:15 NW 12 10.00 Overcast FEW028 OVC090 55.9 47.1 72% 29.82 0.0
14 09:55 NW 12 10.00 Overcast OVC085 54.1 46.4 75% 29.82 0.0
14 09:35 NW 12 10.00 Overcast FEW020 OVC090 53.4 46.9 79% 29.81 0.0
14 09:15 NW 14 10.00 Overcast SCT019 OVC090 52.9 47.5 82% 29.81 0.0
14 08:55 NW 9 10.00 Mostly Cloudy BKN085 51.3 48.2 89% 29.81 0.0
14 08:35 NW 9 10.00 Overcast OVC080 51.1 49.3 94% 29.81 0.0
14 08:15 NW 8 9.00 Overcast OVC080 51.3 49.6 94% 29.8 0.0
14 07:55 NW 10 10.00 Overcast OVC065 51.1 50 52.2 51.1 96% 29.8 0.0
14 07:35 N 5 10.00 Overcast FEW009 OVC065 51.3 50.9 99% 29.8 0.0
14 07:15 NW 6 9.00 Overcast FEW008 OVC060 51.4 51.4 100% 29.8 0.0
14 06:55 NW 9 10.00 Overcast OVC060 51.6 51.6 100% 29.79 0.0
14 06:35 NW 9 9.00 Overcast BKN060 OVC095 51.4 51.4 100% 29.79 0.0
14 06:15 NW 8 8.00 Overcast FEW060 OVC085 51.4 51.4 100% 29.78 0.0
14 05:55 NW 9 8.00 Mostly Cloudy FEW007 BKN080 BKN130 51.4 51.4 100% 29.77 0.0
14 05:35 NW 8 8.00 Overcast BKN005 OVC080 51.6 51.6 100% 29.77 0.0
14 05:15 NW 7 5.00 Fog/Mist OVC004 51.8 51.8 100% 29.77 0.0
14 04:55 W 5 4.00 Fog/Mist OVC003 51.6 51.6 100% 29.77 0.0
14 04:35 NW 7 3.00 Fog/Mist OVC003 51.6 51.6 100% 29.75 0.0
14 04:15 NW 12 4.00 Fog/Mist OVC004 51.8 51.8 100% 29.75 0.0
14 03:55 NW 9 7.00 Overcast OVC004 51.6 51.6 100% 29.77 0.0
14 03:35 NW 10 7.00 Overcast OVC004 51.8 51.8 100% 29.77 0.0
14 03:15 NW 8 10.00 Overcast OVC004 51.6 51.6 100% 29.77 0.0
14 02:55 NW 3 7.00 Overcast OVC003 52 52 100% 29.78 0.0
14 02:35 W 3 5.00 Fog/Mist BKN002 OVC010 51.8 51.8 100% 29.78 0.0
14 02:15 Calm 9.00 Overcast OVC009 52 52 100% 29.78 0.0
14 01:55 W 5 9.00 Mostly Cloudy SCT007 BKN150 BKN170 52.2 52.2 64.8 52 100% 29.8 0.0 0.42
14 01:35 W 5 9.00 Overcast FEW004 SCT085 BKN150 OVC170 52 52 100% 29.79 0.0
14 01:15 W 6 6.00 Fog/Mist FEW004 BKN090 BKN100 BKN120 52.3 52.3 100% 29.8 0.0
14 00:55 NW 5 6.00 Fog/Mist SCT005 BKN032 BKN120 52.2 52.2 100% 29.81 0.0 0.01
14 00:35 NW 6 6.00 Fog/Mist SCT003 BKN033 BKN085 OVC110 52.3 52.3 100% 29.82 0.0 0.01
14 00:15 Calm 6.00 Fog/Mist FEW033 BKN085 52.3 52.3 100% 29.82 0.0 0.01
13 23:55 Calm 7.00 Overcast SCT055 BKN080 OVC095 52.3 52.3 100% 29.81 0.0 0.06
13 23:35 Calm 6.00 Light Rain Fog/Mist BKN060 OVC075 52.3 52.3 100% 29.81 0.0 0.06
13 23:15 SE 5 3.00 Light Rain Fog/Mist OVC070 52.3 52.3 100% 29.82 0.0 0.05
13 22:55 SE 8 2.50 Light Rain Fog/Mist OVC075 52.5 52.5 100% 29.81 0.0 0.17 0.35
13 22:35 SE 5 1.75 Light Rain Fog/Mist OVC075 52.7 52.7 100% 29.82 0.0 0.12
13 22:15 W 5 3.00 Thunderstorm Rain Fog/Mist OVC065 52.9 52.9 100% 29.83 0.0 0.08
13 21:55 NW 17 G 31 0.75 Thunderstorm Heavy Rain Fog/Mist FEW028 BKN042 OVC065 53.6 52.3 96% 29.84 0.0 0.18
13 21:35 NW 28 G 33 10.00 Mostly Cloudy and Windy FEW029 SCT047 BKN060 BKN120 60.8 51.3 71% 29.83 0.0
13 21:15 SW 8 10.00 Fair CLR 62.2 52.2 70% 29.79 0.0
13 20:55 Vrbl 7 10.00 Fair CLR 62.6 51.8 68% 29.78 0.0
13 20:35 Vrbl 7 10.00 A Few Clouds FEW160 63.1 52 67% 29.78 0.0
13 20:15 Vrbl 7 9.00 Partly Cloudy FEW160 SCT190 63.9 51.6 65% 29.79 0.0
13 19:55 Vrbl 7 9.00 Overcast OVC170 65.3 52.3 68.9 65.3 63% 29.77 0.0
13 19:35 S 8 G 17 9.00 Overcast FEW100 OVC150 65.8 52.2 62% 29.77 0.0
13 19:15 S 9 9.00 Overcast FEW080 BKN100 OVC160 66.2 52 60% 29.77 0.0
13 18:55 SW 10 G 23 8.00 Overcast BKN085 OVC150 67.1 51.6 58% 29.78 0.0
13 18:35 S 7 9.00 Overcast SCT080 OVC150 67.6 51.3 56% 29.78 0.0
13 18:15 Vrbl 7 8.00 Overcast OVC150 68 50.7 54% 29.78 0.0
13 17:55 S 8 9.00 Overcast OVC150 68.2 50.7 54% 29.79 0.0
13 17:35 S 7 G 22 9.00 Overcast FEW110 OVC150 68 49.8 52% 29.79 0.0
13 17:15 S 13 G 20 9.00 Mostly Cloudy BKN150 BKN170 68.2 48.9 50% 29.8 0.0
13 16:55 S 10 G 24 9.00 Mostly Cloudy BKN120 BKN160 68.4 48.9 50% 29.81 0.0
13 16:35 S 10 G 17 9.00 Overcast OVC120 68 48.6 50% 29.81 0.0
13 16:15 SW 10 10.00 Overcast OVC120 68.5 48.4 49% 29.82 0.0
13 15:55 S 13 G 24 9.00 Overcast OVC120 67.3 46.6 48% 29.83 0.0
13 15:35 S 9 G 22 9.00 Mostly Cloudy FEW100 BKN130 67.6 46.4 47% 29.83 0.0
13 15:15 S 10 G 28 9.00 Mostly Cloudy FEW100 BKN150 67.5 45.3 45% 29.85 0.0
13 14:55 SW 9 G 20 10.00 Mostly Cloudy BKN085 BKN150 BKN210 68.7 45.7 44% 29.86 0.0
13 14:35 SW 12 G 22 9.00 Overcast BKN085 OVC150 67.3 45 45% 29.86 0.0
13 14:15 S 10 G 22 9.00 Overcast FEW090 OVC150 68.4 44.6 43% 29.87 0.0
13 13:55 S 9 G 21 9.00 Mostly Cloudy SCT085 BKN160 BKN210 66.6 43.5 68 59.5 43% 29.87 0.0
13 13:35 SW 10 G 25 9.00 Mostly Cloudy SCT170 BKN200 BKN220 66.6 43.9 44% 29.88 0.0
13 13:15 S 10 G 23 9.00 Overcast BKN160 OVC190 67.6 44.4 43% 29.89 0.0
13 12:55 S 10 G 17 9.00 Overcast OVC160 66.4 44.6 46% 29.9 0.0
13 12:35 SW 10 G 20 9.00 Mostly Cloudy BKN170 66.6 43.9 44% 29.9 0.0
13 12:15 SW 7 G 20 9.00 A Few Clouds FEW170 66.2 43.9 45% 29.9 0.0
13 11:55 Vrbl 7 9.00 Partly Cloudy SCT160 67.1 45.5 46% 29.92 0.0
13 11:35 Vrbl 6 9.00 Overcast OVC160 65.7 45.5 48% 29.92 0.0
13 11:15 S 8 9.00 Partly Cloudy SCT160 SCT220 65.3 45.7 49% 29.93 0.0
13 10:55 S 9 9.00 Partly Cloudy FEW270 SCT370 65.5 45.9 49% 29.94 0.0
13 10:35 Vrbl 7 10.00 Partly Cloudy FEW085 SCT260 SCT350 64.6 45.3 50% 29.94 0.0
13 10:15 S 10 10.00 Mostly Cloudy SCT085 BKN270 63.9 45 50% 29.94 0.0
13 09:55 Vrbl 7 9.00 A Few Clouds FEW090 64.2 45.3 50% 29.95 0.0
13 09:35 SW 9 10.00 Fair CLR 63.3 45.5 52% 29.95 0.0
13 09:15 Vrbl 7 10.00 Fair CLR 62.6 45.3 53% 29.96 0.0
13 08:55 SW 8 10.00 Fair CLR 61.5 44.1 53% 29.97 0.0
13 08:35 SW 9 9.00 Fair CLR 60.8 43.9 54% 29.97 0.0
13 08:15 Vrbl 5 10.00 Fair CLR 59.9 44.2 56% 29.97 0.0
13 07:55 SW 8 10.00 Fair CLR 59 44.1 59 51.3 58% 29.96 0.0
13 07:35 Vrbl 5 10.00 Fair CLR 58.3 44.1 59% 29.96 0.0
13 07:15 Vrbl 7 10.00 Fair CLR 57.4 44.4 62% 29.97 0.0
13 06:55 Vrbl 6 9.00 Partly Cloudy SCT160 56.1 44.8 66% 29.97 0.0
13 06:35 Vrbl 5 9.00 Partly Cloudy FEW140 SCT160 56.3 45 66% 29.97 0.0
13 06:15 SW 7 9.00 Mostly Cloudy BKN160 55.8 46.4 71% 29.96 0.0
13 05:55 Vrbl 5 10.00 Overcast OVC160 54.5 48 79% 29.97 0.0
13 05:35 Vrbl 5 10.00 Overcast OVC150 54.1 48.7 82% 29.97 0.0
13 05:15 Vrbl 5 10.00 Overcast OVC150 54 48.9 83% 29.98 0.0
13 04:55 Vrbl 3 10.00 Mostly Cloudy BKN160 BKN190 53.4 48.9 85% 29.99 0.0
13 04:35 Vrbl 3 10.00 Mostly Cloudy BKN180 53.4 48.9 85% 29.99 0.0
13 03:55 Calm 10.00 Overcast BKN120 OVC140 52.2 47.5 84% 30.01 0.0
13 03:35 Calm 10.00 Overcast BKN120 OVC150 52 46.9 83% 30.01 0.0
13 03:15 Calm 10.00 Overcast BKN130 OVC160 51.6 46 81% 30.02 0.0
13 02:55 Vrbl 3 10.00 Overcast BKN140 OVC160 51.6 45.7 80% 30.02 0.0
13 02:35 Vrbl 3 10.00 Overcast OVC150 51.6 45.3 79% 30.03 0.0
13 02:15 Vrbl 3 10.00 Overcast OVC150 51.3 45.1 80% 30.04 0.0
13 01:55 SE 3 10.00 A Few Clouds FEW160 51.4 45.1 59 50.9 79% 30.05 0.0
13 01:35 SE 5 10.00 A Few Clouds FEW075 52 45.3 78% 30.06 0.0
13 01:15 Vrbl 3 10.00 Mostly Cloudy BKN075 52 45.5 79% 30.07 0.0
13 00:55 Calm 10.00 A Few Clouds FEW075 52 45.5 79% 30.08 0.0
13 00:35 Calm 10.00 A Few Clouds FEW070 51.6 45.7 80% 30.08 0.0
13 00:15 Vrbl 3 10.00 Mostly Cloudy BKN070 52.5 45.9 78% 30.08 0.0
12 23:55 Vrbl 3 10.00 Fair CLR 52.5 46.6 80% 30.09 0.0
12 23:35 Vrbl 5 10.00 Fair CLR 52.7 46.2 79% 30.09 0.0
12 23:15 Calm 10.00 Fair CLR 52.2 45.7 79% 30.1 0.0
12 22:55 Vrbl 3 10.00 Fair CLR 53.4 43.5 69% 30.1 0.0
12 22:35 Vrbl 5 10.00 Fair CLR 54.1 41.4 62% 30.11 0.0
12 22:15 Calm 10.00 Fair CLR 54.9 39.4 56% 30.11 0.0
12 21:55 Vrbl 3 10.00 Fair CLR 55.8 39 54% 30.1 0.0
12 21:35 Calm 10.00 Fair CLR 55.8 38.7 53% 30.1 0.0
12 21:15 Vrbl 3 10.00 Fair CLR 56.3 38.1 51% 30.1 0.0
12 20:55 Vrbl 3 10.00 Fair CLR 57.6 37 46% 30.1 0.0
12 20:35 Vrbl 3 9.00 Fair CLR 57.2 37.4 48% 30.1 0.0
12 20:15 Calm 10.00 Fair CLR 57.7 37.4 47% 30.1 0.0
12 19:55 Calm 10.00 Fair CLR 59.7 37.4 65.5 59.7 44% 30.1 0.0
12 19:35 Vrbl 3 10.00 Fair CLR 60.3 37.8 43% 30.1 0.0
12 19:15 Vrbl 3 10.00 Fair CLR 61.5 37.2 41% 30.1 0.0
12 18:55 Vrbl 3 10.00 Fair CLR 62.6 37.2 39% 30.09 0.0
12 18:35 Vrbl 5 10.00 Fair CLR 62.8 36.7 38% 30.1 0.0
12 18:15 Vrbl 5 10.00 Fair CLR 63.5 36.7 37% 30.1 0.0
12 17:55 Vrbl 6 10.00 Fair CLR 65.3 35.8 34% 30.09 0.0
12 17:35 Calm 10.00 Fair CLR 64.8 35.2 34% 30.1 0.0
12 17:15 Vrbl 6 10.00 Fair CLR 64.9 36 34% 30.1 0.0
12 16:55 NW 8 10.00 Fair CLR 64.6 35.2 34% 30.11 0.0
12 16:35 NW 7 10.00 Fair CLR 64.4 34.9 33% 30.11 0.0
12 16:15 NW 14 10.00 A Few Clouds FEW340 64.4 34.7 33% 30.11 0.0
12 15:55 NW 10 10.00 Fair CLR 63.9 34.2 33% 30.12 0.0
12 15:35 NW 10 10.00 Fair CLR 63.5 34.5 34% 30.13 0.0
12 15:15 W 8 10.00 Fair CLR 62.6 33.6 34% 30.13 0.0
12 14:55 Vrbl 3 10.00 Fair CLR 62.1 32.4 33% 30.14 0.0
12 14:35 NW 10 10.00 Fair CLR 62.1 32.9 34% 30.15 0.0
12 14:15 Vrbl 6 10.00 Fair CLR 60.8 30.9 32% 30.15 0.0
12 13:55 Vrbl 7 10.00 A Few Clouds FEW370 60.3 30.4 61.5 48.7 32% 30.17 0.0
12 13:35 NW 13 10.00 A Few Clouds FEW370 61.3 31.3 32% 30.17 0.0
12 13:15 W 12 G 17 10.00 A Few Clouds FEW360 59.7 29.1 31% 30.17 0.0
12 12:55 NW 10 10.00 Fair CLR 60.3 31.1 33% 30.18 0.0
12 12:35 NW 8 10.00 Fair CLR 58.3 28.2 32% 30.19 0.0
12 12:15 W 9 10.00 A Few Clouds FEW380 59 28.4 31% 30.19 0.0
12 11:55 W 9 10.00 Fair CLR 57.6 28.2 33% 30.2 0.0
12 11:35 N 6 10.00 Fair CLR 57.4 28.2 33% 30.21 0.0
12 11:15 Vrbl 6 10.00 Fair CLR 56.5 26.6 32% 30.21 0.0
12 10:55 NW 7 10.00 Fair CLR 55.9 27 33% 30.22 0.0
12 10:35 E 6 10.00 Fair CLR 55.2 27 34% 30.22 0.0
12 10:15 E 7 10.00 Fair CLR 54.1 25.7 33% 30.22 0.0
12 09:15 Vrbl 7 10.00 Fair CLR 52.3 27.5 38% 30.23 0.0
12 08:55 N 9 10.00 Fair CLR 51.6 28.4 41% 30.23 0.0
12 08:35 N 10 10.00 Fair CLR 50.4 28.6 43% 30.22 0.0
12 08:15 N 7 10.00 Fair CLR 49.5 29.7 47% 47 30.23 0.0
12 07:55 N 8 10.00 Fair CLR 48 28.9 49.3 41.9 48% 45 30.23 0.0
12 07:35 N 6 10.00 Fair CLR 47.8 29.5 49% 46 30.22 0.0
12 07:15 N 7 10.00 Fair CLR 46.2 28.8 51% 43 30.21 0.0
12 06:55 N 6 10.00 Fair CLR 44.2 28 53% 41 30.21 0.0
12 06:35 N 5 10.00 Fair CLR 43.2 27.7 54% 41 30.2 0.0
12 06:15 N 5 10.00 Fair CLR 43.3 27.1 53% 41 30.2 0.0
12 05:55 NW 3 10.00 Fair CLR 42.4 27.3 55% 30.19 0.0
12 05:35 NW 3 10.00 Fair CLR 43.3 27.9 54% 30.19 0.0
12 05:15 N 5 10.00 Fair CLR 43.5 28.8 56% 41 30.18 0.0
12 04:35 N 6 10.00 Fair CLR 43.5 30 59% 41 30.18 0.0
12 04:15 NW 5 10.00 Fair CLR 45.5 28.9 52% 44 30.18 0.0
12 03:55 N 6 10.00 Fair CLR 46 30 54% 44 30.17 0.0
12 03:35 NE 5 10.00 Fair CLR 47.1 30.7 53% 46 30.17 0.0
12 03:15 N 6 10.00 Fair CLR 47.3 33.3 58% 45 30.16 0.0
12 02:55 N 7 10.00 Fair CLR 47.5 35.4 63% 45 30.16 0.0
12 02:15 Vrbl 6 10.00 Fair CLR 48.9 35.4 60% 47 30.15 0.0
12 01:55 N 10 10.00 Fair CLR 49.6 35.2 54.9 46.2 58% 46 30.15 0.0
12 01:35 N 12 10.00 Fair CLR 50.2 35.2 57% 30.15 0.0
12 01:15 N 13 G 18 10.00 Fair CLR 50.4 34.9 55% 30.15 0.0
12 00:55 N 6 10.00 Fair CLR 47.1 37.9 71% 45 30.14 0.0
12 00:35 NW 3 10.00 A Few Clouds FEW090 48.6 37.8 66% 30.14 0.0
12 00:15 Vrbl 6 10.00 Partly Cloudy SCT090 49.6 40.1 70% 48 30.13 0.0
11 23:55 W 7 10.00 Fair CLR 49.8 38.7 66% 47 30.12 0.0
11 23:35 W 6 10.00 A Few Clouds FEW095 49.8 37.6 63% 48 30.11 0.0
11 23:15 W 6 10.00 Partly Cloudy SCT095 50 36.3 60% 48 30.12 0.0
11 22:55 W 6 10.00 Partly Cloudy SCT090 51.1 34.5 53% 30.11 0.0
11 22:35 W 6 10.00 Partly Cloudy SCT080 SCT100 51.8 33.3 49% 30.11 0.0
11 22:15 W 3 10.00 Mostly Cloudy BKN090 BKN100 52.5 32.9 47% 30.11 0.0
11 21:55 SW 3 10.00 Partly Cloudy SCT085 53.1 32.2 45% 30.1 0.0
11 21:35 SW 3 10.00 A Few Clouds FEW090 53.1 32.2 45% 30.1 0.0
11 21:15 Calm 10.00 Fair CLR 53.2 32.5 45% 30.1 0.0
11 20:55 SW 3 10.00 Partly Cloudy SCT100 54.1 32.4 44% 30.09 0.0
11 20:35 SW 3 10.00 Partly Cloudy SCT100 54.3 32.2 43% 30.08 0.0
11 20:15 SW 3 10.00 Fair CLR 54.7 32.2 43% 30.08 0.0
11 19:55 SW 3 10.00 Fair CLR 55.6 32.2 60.1 55.2 41% 30.08 0.0
11 19:35 SW 3 10.00 A Few Clouds FEW090 56.7 31.5 38% 30.08 0.0
11 19:15 Calm 10.00 Fair CLR 57.2 32.2 39% 30.08 0.0
11 18:55 W 3 10.00 Fair CLR 58.1 32.7 38% 30.08 0.0
11 18:35 W 5 10.00 Fair CLR 58.5 31.8 37% 30.07 0.0
11 18:15 W 5 10.00 Fair CLR 58.6 32 37% 30.07 0.0
11 17:55 Vrbl 5 10.00 Fair CLR 59.5 31.6 35% 30.07 0.0
11 17:35 W 9 10.00 Fair CLR 59.5 31.3 34% 30.07 0.0
11 17:15 NW 6 10.00 Fair CLR 59.2 30.4 34% 30.07 0.0
11 16:55 Vrbl 3 10.00 Fair CLR 58.3 30.2 34% 30.07 0.0
11 16:35 W 9 10.00 A Few Clouds FEW260 59.2 30.9 34% 30.07 0.0
11 16:15 NW 7 10.00 Partly Cloudy SCT250 57.9 32.4 38% 30.08 0.0
Date Time (edt) Wind (mph) Vis. (mi.) Weather Sky Cond. Air Dwpt Max. Min. Relative Humidity Wind Chill (°F) Heat Index (°F) altimeter (in) sea level (mb) 1 hr 3 hr 6 hr
6 hour
Temperature (ºF) Pressure Precipitation (in)