Each colour starts at the value shown. Wind colours match across all three units. Dry cells stay neutral. Colours describe the displayed values, not official weather warnings.
Preparing forecast graphs…
Times and values match the detailed forecast. Tap or point at a value for details. Scroll each chart sideways for later days. Rain / precipitation is the total water equivalent per forecast interval, including snow; snowfall is fresh snow per interval, not snow depth.
GFS and ECMWF model comparison. Each model retains its own forecast times and horizon. Precipitation and snowfall amounts cover their own forecast intervals; these can differ between models.
ECMWF IFS · Run 2026-10-17 00:00:00 UTC · 10 days · Times: UTC.
Coordinates: 42.3185702°N, -90.4018138°E · Requested elevation: 184 m. Model terrain: 246 m. Terrain and 1000/925/850/700 hPa profiles are used for height estimates.
Outside the available profile, temperature uses an estimated 5.5°C/km height correction; wind retains the nearest available model-level value. Humidity is estimated with adjusted pressure and temperature.
These are altitude estimates, not a simulation of local mountain terrain. Precipitation, cloud and sea-level pressure use horizontal interpolation only.
Precipitation includes rain and snow water equivalent: preceding 3 hours through day 6, then 6 hours (see cell tooltip). Snow (cm) estimates fresh snowfall from precipitation and temperature using the GFS conversion; it is not snow depth on the ground. Freezing (m) uses additional 600/500 hPa temperatures when available and estimates the lowest resolved 0°C crossing above sea level. When all sampled levels are warm, the upper profile limit is shown (see tooltip). < marks an entirely cold sampled profile and its lower height limit. No extrapolation is used.
Day Time (UTC) Temp. (°C) Humidity (%) Wind (km/h) Wind (knots) Wind (Bft) Direction Precip. (mm) Snow (cm) Pressure (hPa) Freezing (m) Conditions | Saturday, 17/10 00:00 9.5 57 18 10 3B N — — 1030 1346 Clear 4% cloud 03:00 7.8 60 15 8 3B N 0 0 1033 1293 Clear 0% cloud 06:00 5.2 70 9 5 2B N 0 0 1034 1394 Clear 0% cloud 09:00 3.5 80 5 3 1B N 0 0 1034 1740 Clear 0% cloud 12:00 2.8 82 1 1 1B SW 0 0 1034 2691 Clear 5% cloud 15:00 7.6 57 10 5 2B SW 0 0 1035 3077 Clear 0% cloud 18:00 11.7 43 13 7 3B SW 0 0 1033 3195 Clear 0% cloud 21:00 12.9 42 16 9 3B SW 0 0 1030 3428 Clear 3% cloud Sunday, 18/10 00:00 9.2 58 12 7 2B S 0 0 1029 3658 Clear 0% cloud 03:00 7.7 63 14 8 3B S 0 0 1030 3874 Clear 0% cloud 06:00 7.2 67 16 8 3B S 0 0 1029 3986 Clear 0% cloud 09:00 6.7 72 15 8 3B SW 0 0 1029 4018 Clear 0% cloud 12:00 6.1 76 15 8 3B S 0 0 1029 4083 Clear 0% cloud 15:00 10.4 65 18 10 3B S 0 0 1029 4228 Clear 0% cloud 18:00 15.4 54 22 12 4B SW 0 0 1027 4289 Clear 0% cloud 21:00 16.7 52 21 11 4B S 0 0 1026 4204 Clear 0% cloud Monday, 19/10 00:00 12.7 66 15 8 3B S 0 0 1026 4385 Clear 0% cloud 03:00 10.6 75 15 8 3B S 0 0 1027 4396 Clear 0% cloud 06:00 8.8 77 11 6 2B S 0 0 1027 4103 Clear 0% cloud 09:00 7.1 83 7 4 2B SW 0 0 1028 3860 Clear 0% cloud 12:00 5.9 88 7 4 2B S 0 0 1029 3780 Clear 3% cloud 15:00 11.4 71 8 4 2B S 0 0 1029 3736 Overcast 95% cloud 18:00 16.1 59 9 5 2B S 0 0 1028 3705 Overcast 100% cloud 21:00 17.2 54 8 4 2B S 0 0 1026 3672 Partly cloudy 40% cloud Tuesday, 20/10 00:00 12.4 76 6 3 2B SE 0 0 1026 3733 Overcast 96% cloud 03:00 10.2 82 7 4 2B SE 0 0 1027 3791 Cloudy 75% cloud 06:00 8.9 85 6 3 1B SE 0 0 1027 3802 Overcast 87% cloud 09:00 7.4 88 4 2 1B SE 0 0 1028 3787 Overcast 90% cloud 12:00 6.4 91 5 3 1B SE 0 0 1028 3774 Clear 2% cloud 15:00 12.7 73 6 3 1B SE 0 0 1029 3688 Overcast 98% cloud 18:00 16.8 56 8 4 2B S 0 0 1028 3580 Cloudy 79% cloud 21:00 18.3 49 9 5 2B SE 0 0 1026 3621 Partly cloudy 23% cloud Wednesday, 21/10 00:00 13 72 7 4 2B SE 0 0 1026 3632 Cloudy 69% cloud 03:00 12 75 8 5 2B SE 0 0 1026 3679 Partly cloudy 36% cloud 06:00 9.8 84 7 4 2B S 0 0 1025 3671 Partly cloudy 40% cloud 09:00 8.7 87 6 3 1B S 0 0 1025 3687 Partly cloudy 26% cloud 12:00 8 90 5 3 1B SE 0 0 1026 3707 Clear 8% cloud 15:00 13.9 74 6 3 2B S 0 0 1026 3702 Clear 10% cloud 18:00 19.1 54 10 5 2B S 0 0 1024 3716 Clear 2% cloud 21:00 20.1 49 10 5 2B S 0 0 1022 3717 Clear 13% cloud Thursday, 22/10 00:00 14.6 73 6 3 1B S 0 0 1023 3652 Clear 7% cloud 03:00 12.4 79 5 3 1B S 0 0 1023 3629 Clear 1% cloud 06:00 11.2 81 2 1 1B S 0 0 1023 3606 Clear 7% cloud 09:00 10.1 85 1 1 1B SW 0 0 1023 3608 Clear 0% cloud 12:00 9.5 87 0 0 0B E 0 0 1023 3632 Clear 0% cloud 15:00 15.5 72 3 1 1B E 0 0 1024 3632 Clear 0% cloud 18:00 20.6 52 6 3 2B SE 0 0 1024 3616 Clear 0% cloud 21:00 20.9 50 5 3 1B SE 0 0 1022 3678 Clear 0% cloud Friday, 23/10 00:00 15.7 72 3 2 1B E 0 0 1023 3737 Clear 5% cloud 06:00 11.9 85 9 5 2B E 0 0 1024 3856 Partly cloudy 49% cloud 12:00 10.5 94 9 5 2B SE 0 0 1025 3943 Clear 1% cloud 18:00 19.8 58 15 8 3B SE 0 0 1024 3951 Overcast 89% cloud Saturday, 24/10 00:00 15.8 71 13 7 3B SE 0 0 1023 3930 Cloudy 69% cloud 06:00 13.1 81 14 8 3B SE 0 0 1023 3946 Cloudy 77% cloud 12:00 11.6 86 13 7 3B SE 0 0 1024 3990 Overcast 83% cloud 18:00 18.6 59 17 9 3B SE 0 0 1022 4101 Overcast 96% cloud Sunday, 25/10 00:00 16.7 64 14 8 3B SE 0 0 1021 4122 Overcast 100% cloud 06:00 14.5 69 13 7 3B S 0 0 1021 3159 Overcast 100% cloud 12:00 13.1 76 10 6 2B S 0 0 1021 3154 Overcast 100% cloud 18:00 19.4 61 10 5 2B S 0.03 0 1022 3155 Cloudy 62% cloud Monday, 26/10 00:00 16.9 81 1 0 0B SW 0.12 0 1023 3156 Overcast 99% cloud 06:00 14.3 92 11 6 2B NW 0 0 1024 3167 Clear 3% cloud 12:00 12.7 93 14 7 3B N 0 0 1028 3186 Partly cloudy 45% cloud 18:00 17.8 70 11 6 2B NE 0.01 0 1029 3202 Overcast 96% cloud Tuesday, 27/10 00:00 16.4 74 8 4 2B NE 0.00 0 1028 3196 Overcast 100% cloud |
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Chestnut Mountain Resort is a downhill ski area in Illinois, United States. Mapped terrain includes easy, intermediate, advanced routes. Its mapped lift network extends from approximately 184 to 311 metres above sea level.
Data: OpenSkiData / OpenSkiMap, OpenStreetMap contributors (ODbL), Skimap.org, Who's On First, Mapterhorn.
Preparing forecast graphs…
Times and values match the detailed forecast. Tap or point at a value for details. Scroll each chart sideways for later days. Rain / precipitation is the total water equivalent per forecast interval, including snow; snowfall is fresh snow per interval, not snow depth.
GFS and ECMWF model comparison. Each model retains its own forecast times and horizon. Precipitation and snowfall amounts cover their own forecast intervals; these can differ between models.
ECMWF IFS · Run 2026-10-17 00:00:00 UTC · 10 days · Times: UTC.
Coordinates: 42.3185702°N, -90.4018138°E · Requested elevation: 184 m. Model terrain: 246 m. Terrain and 1000/925/850/700 hPa profiles are used for height estimates.
Outside the available profile, temperature uses an estimated 5.5°C/km height correction; wind retains the nearest available model-level value. Humidity is estimated with adjusted pressure and temperature.
These are altitude estimates, not a simulation of local mountain terrain. Precipitation, cloud and sea-level pressure use horizontal interpolation only.
Precipitation includes rain and snow water equivalent: preceding 3 hours through day 6, then 6 hours (see cell tooltip). Snow (cm) estimates fresh snowfall from precipitation and temperature using the GFS conversion; it is not snow depth on the ground. Freezing (m) uses additional 600/500 hPa temperatures when available and estimates the lowest resolved 0°C crossing above sea level. When all sampled levels are warm, the upper profile limit is shown (see tooltip). < marks an entirely cold sampled profile and its lower height limit. No extrapolation is used.
Day Time (UTC) Temp. (°C) Humidity (%) Wind (km/h) Wind (knots) Wind (Bft) Direction Precip. (mm) Snow (cm) Pressure (hPa) Freezing (m) Conditions | Saturday, 17/10 00:00 9.5 57 18 10 3B N — — 1030 1346 Clear 4% cloud 03:00 7.8 60 15 8 3B N 0 0 1033 1293 Clear 0% cloud 06:00 5.2 70 9 5 2B N 0 0 1034 1394 Clear 0% cloud 09:00 3.5 80 5 3 1B N 0 0 1034 1740 Clear 0% cloud 12:00 2.8 82 1 1 1B SW 0 0 1034 2691 Clear 5% cloud 15:00 7.6 57 10 5 2B SW 0 0 1035 3077 Clear 0% cloud 18:00 11.7 43 13 7 3B SW 0 0 1033 3195 Clear 0% cloud 21:00 12.9 42 16 9 3B SW 0 0 1030 3428 Clear 3% cloud Sunday, 18/10 00:00 9.2 58 12 7 2B S 0 0 1029 3658 Clear 0% cloud 03:00 7.7 63 14 8 3B S 0 0 1030 3874 Clear 0% cloud 06:00 7.2 67 16 8 3B S 0 0 1029 3986 Clear 0% cloud 09:00 6.7 72 15 8 3B SW 0 0 1029 4018 Clear 0% cloud 12:00 6.1 76 15 8 3B S 0 0 1029 4083 Clear 0% cloud 15:00 10.4 65 18 10 3B S 0 0 1029 4228 Clear 0% cloud 18:00 15.4 54 22 12 4B SW 0 0 1027 4289 Clear 0% cloud 21:00 16.7 52 21 11 4B S 0 0 1026 4204 Clear 0% cloud Monday, 19/10 00:00 12.7 66 15 8 3B S 0 0 1026 4385 Clear 0% cloud 03:00 10.6 75 15 8 3B S 0 0 1027 4396 Clear 0% cloud 06:00 8.8 77 11 6 2B S 0 0 1027 4103 Clear 0% cloud 09:00 7.1 83 7 4 2B SW 0 0 1028 3860 Clear 0% cloud 12:00 5.9 88 7 4 2B S 0 0 1029 3780 Clear 3% cloud 15:00 11.4 71 8 4 2B S 0 0 1029 3736 Overcast 95% cloud 18:00 16.1 59 9 5 2B S 0 0 1028 3705 Overcast 100% cloud 21:00 17.2 54 8 4 2B S 0 0 1026 3672 Partly cloudy 40% cloud Tuesday, 20/10 00:00 12.4 76 6 3 2B SE 0 0 1026 3733 Overcast 96% cloud 03:00 10.2 82 7 4 2B SE 0 0 1027 3791 Cloudy 75% cloud 06:00 8.9 85 6 3 1B SE 0 0 1027 3802 Overcast 87% cloud 09:00 7.4 88 4 2 1B SE 0 0 1028 3787 Overcast 90% cloud 12:00 6.4 91 5 3 1B SE 0 0 1028 3774 Clear 2% cloud 15:00 12.7 73 6 3 1B SE 0 0 1029 3688 Overcast 98% cloud 18:00 16.8 56 8 4 2B S 0 0 1028 3580 Cloudy 79% cloud 21:00 18.3 49 9 5 2B SE 0 0 1026 3621 Partly cloudy 23% cloud Wednesday, 21/10 00:00 13 72 7 4 2B SE 0 0 1026 3632 Cloudy 69% cloud 03:00 12 75 8 5 2B SE 0 0 1026 3679 Partly cloudy 36% cloud 06:00 9.8 84 7 4 2B S 0 0 1025 3671 Partly cloudy 40% cloud 09:00 8.7 87 6 3 1B S 0 0 1025 3687 Partly cloudy 26% cloud 12:00 8 90 5 3 1B SE 0 0 1026 3707 Clear 8% cloud 15:00 13.9 74 6 3 2B S 0 0 1026 3702 Clear 10% cloud 18:00 19.1 54 10 5 2B S 0 0 1024 3716 Clear 2% cloud 21:00 20.1 49 10 5 2B S 0 0 1022 3717 Clear 13% cloud Thursday, 22/10 00:00 14.6 73 6 3 1B S 0 0 1023 3652 Clear 7% cloud 03:00 12.4 79 5 3 1B S 0 0 1023 3629 Clear 1% cloud 06:00 11.2 81 2 1 1B S 0 0 1023 3606 Clear 7% cloud 09:00 10.1 85 1 1 1B SW 0 0 1023 3608 Clear 0% cloud 12:00 9.5 87 0 0 0B E 0 0 1023 3632 Clear 0% cloud 15:00 15.5 72 3 1 1B E 0 0 1024 3632 Clear 0% cloud 18:00 20.6 52 6 3 2B SE 0 0 1024 3616 Clear 0% cloud 21:00 20.9 50 5 3 1B SE 0 0 1022 3678 Clear 0% cloud Friday, 23/10 00:00 15.7 72 3 2 1B E 0 0 1023 3737 Clear 5% cloud 06:00 11.9 85 9 5 2B E 0 0 1024 3856 Partly cloudy 49% cloud 12:00 10.5 94 9 5 2B SE 0 0 1025 3943 Clear 1% cloud 18:00 19.8 58 15 8 3B SE 0 0 1024 3951 Overcast 89% cloud Saturday, 24/10 00:00 15.8 71 13 7 3B SE 0 0 1023 3930 Cloudy 69% cloud 06:00 13.1 81 14 8 3B SE 0 0 1023 3946 Cloudy 77% cloud 12:00 11.6 86 13 7 3B SE 0 0 1024 3990 Overcast 83% cloud 18:00 18.6 59 17 9 3B SE 0 0 1022 4101 Overcast 96% cloud Sunday, 25/10 00:00 16.7 64 14 8 3B SE 0 0 1021 4122 Overcast 100% cloud 06:00 14.5 69 13 7 3B S 0 0 1021 3159 Overcast 100% cloud 12:00 13.1 76 10 6 2B S 0 0 1021 3154 Overcast 100% cloud 18:00 19.4 61 10 5 2B S 0.03 0 1022 3155 Cloudy 62% cloud Monday, 26/10 00:00 16.9 81 1 0 0B SW 0.12 0 1023 3156 Overcast 99% cloud 06:00 14.3 92 11 6 2B NW 0 0 1024 3167 Clear 3% cloud 12:00 12.7 93 14 7 3B N 0 0 1028 3186 Partly cloudy 45% cloud 18:00 17.8 70 11 6 2B NE 0.01 0 1029 3202 Overcast 96% cloud Tuesday, 27/10 00:00 16.4 74 8 4 2B NE 0.00 0 1028 3196 Overcast 100% cloud |
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Preparing forecast graphs…
Times and values match the detailed forecast. Tap or point at a value for details. Scroll each chart sideways for later days. Rain / precipitation is the total water equivalent per forecast interval, including snow; snowfall is fresh snow per interval, not snow depth.
GFS and ECMWF model comparison. Each model retains its own forecast times and horizon. Precipitation and snowfall amounts cover their own forecast intervals; these can differ between models.
ECMWF IFS · Run 2026-10-17 00:00:00 UTC · 10 days · Times: UTC.
Coordinates: 42.3166266°N, -90.3968356°E · Requested elevation: 311 m. Model terrain: 245 m. Terrain and 1000/925/850/700 hPa profiles are used for height estimates.
These are altitude estimates, not a simulation of local mountain terrain. Precipitation, cloud and sea-level pressure use horizontal interpolation only.
Precipitation includes rain and snow water equivalent: preceding 3 hours through day 6, then 6 hours (see cell tooltip). Snow (cm) estimates fresh snowfall from precipitation and temperature using the GFS conversion; it is not snow depth on the ground. Freezing (m) uses additional 600/500 hPa temperatures when available and estimates the lowest resolved 0°C crossing above sea level. When all sampled levels are warm, the upper profile limit is shown (see tooltip). < marks an entirely cold sampled profile and its lower height limit. No extrapolation is used.
Day Time (UTC) Temp. (°C) Humidity (%) Wind (km/h) Wind (knots) Wind (Bft) Direction Precip. (mm) Snow (cm) Pressure (hPa) Freezing (m) Conditions | Saturday, 17/10 00:00 8.7 59 22 12 4B N — — 1030 1346 Clear 4% cloud 03:00 7 61 18 10 3B N 0 0 1033 1293 Clear 0% cloud 06:00 4.6 70 12 7 3B N 0 0 1034 1394 Clear 0% cloud 09:00 3 77 7 4 2B N 0 0 1034 1738 Clear 0% cloud 12:00 2.5 77 1 1 1B W 0 0 1034 2690 Clear 5% cloud 15:00 6.9 55 10 5 2B SW 0 0 1035 3076 Clear 0% cloud 18:00 10.5 45 14 8 3B SW 0 0 1033 3195 Clear 0% cloud 21:00 11.9 43 17 9 3B SW 0 0 1030 3427 Clear 3% cloud Sunday, 18/10 00:00 8.5 58 15 8 3B S 0 0 1029 3657 Clear 0% cloud 03:00 7.4 61 17 9 3B SW 0 0 1030 3873 Clear 0% cloud 06:00 6.9 66 20 11 3B SW 0 0 1029 3985 Clear 0% cloud 09:00 6.5 68 20 11 4B SW 0 0 1029 4018 Clear 0% cloud 12:00 6 74 19 10 3B SW 0 0 1029 4082 Clear 0% cloud 15:00 9.9 64 22 12 4B SW 0 0 1029 4227 Clear 0% cloud 18:00 14.3 55 25 14 4B SW 0 0 1027 4288 Clear 0% cloud 21:00 15.7 54 23 12 4B S 0 0 1026 4204 Clear 0% cloud Monday, 19/10 00:00 12.2 66 18 10 3B S 0 0 1026 4384 Clear 0% cloud 03:00 10.3 73 18 10 3B S 0 0 1027 4397 Clear 0% cloud 06:00 8.7 75 14 8 3B SW 0 0 1027 4103 Clear 0% cloud 09:00 7.1 82 10 6 2B SW 0 0 1028 3859 Clear 0% cloud 12:00 6 87 7 4 2B S 0 0 1029 3780 Clear 3% cloud 15:00 10.9 71 8 5 2B S 0 0 1029 3736 Overcast 95% cloud 18:00 15.2 60 10 5 2B S 0 0 1028 3705 Overcast 100% cloud 21:00 16.2 57 9 5 2B S 0 0 1026 3672 Partly cloudy 40% cloud Tuesday, 20/10 00:00 11.9 76 7 4 2B SE 0 0 1026 3733 Overcast 96% cloud 03:00 10 81 8 4 2B SE 0 0 1027 3791 Cloudy 75% cloud 06:00 8.8 83 7 4 2B S 0 0 1027 3802 Overcast 87% cloud 09:00 7.5 85 4 2 1B SE 0 0 1028 3787 Overcast 89% cloud 12:00 6.5 88 5 3 1B SE 0 0 1028 3774 Clear 2% cloud 15:00 12.1 73 6 3 2B SE 0 0 1029 3688 Overcast 98% cloud 18:00 15.9 57 9 5 2B S 0 0 1028 3581 Cloudy 79% cloud 21:00 17.3 51 10 5 2B SE 0 0 1026 3621 Partly cloudy 22% cloud Wednesday, 21/10 00:00 12.6 72 9 5 2B SE 0 0 1026 3632 Cloudy 69% cloud 03:00 11.7 74 10 5 2B S 0 0 1026 3679 Partly cloudy 38% cloud 06:00 9.8 82 9 5 2B S 0 0 1025 3671 Partly cloudy 40% cloud 09:00 8.7 86 7 4 2B S 0 0 1025 3687 Partly cloudy 25% cloud 12:00 8.1 87 6 3 1B S 0 0 1026 3707 Clear 9% cloud 15:00 13.5 73 7 4 2B S 0 0 1026 3702 Clear 10% cloud 18:00 18.2 55 11 6 2B S 0 0 1024 3716 Clear 2% cloud 21:00 19.1 51 10 6 2B S 0 0 1022 3717 Clear 13% cloud Thursday, 22/10 00:00 14.3 72 6 3 2B S 0 0 1023 3653 Clear 7% cloud 03:00 12.3 77 6 3 2B S 0 0 1023 3629 Clear 1% cloud 06:00 11.3 79 3 2 1B SW 0 0 1023 3606 Clear 7% cloud 09:00 10.2 83 2 1 1B SW 0 0 1023 3608 Clear 0% cloud 12:00 9.7 85 0 0 0B N 0 0 1023 3632 Clear 0% cloud 15:00 15 72 3 2 1B E 0 0 1024 3632 Clear 0% cloud 18:00 19.5 54 7 4 2B SE 0 0 1024 3616 Clear 0% cloud 21:00 19.9 52 5 3 1B SE 0 0 1022 3677 Clear 0% cloud Friday, 23/10 00:00 15.2 72 3 2 1B E 0 0 1023 3736 Clear 5% cloud 06:00 11.9 84 10 5 2B E 0 0 1024 3856 Partly cloudy 49% cloud 12:00 10.5 92 10 5 2B SE 0 0 1025 3943 Clear 2% cloud 18:00 18.8 60 16 9 3B SE 0 0 1024 3951 Overcast 89% cloud Saturday, 24/10 00:00 15.2 72 15 8 3B SE 0 0 1023 3931 Cloudy 68% cloud 06:00 12.8 80 18 10 3B SE 0 0 1023 3946 Cloudy 77% cloud 12:00 11.4 84 16 9 3B S 0 0 1024 3989 Overcast 83% cloud 18:00 17.8 59 20 11 4B S 0 0 1022 4101 Overcast 96% cloud Sunday, 25/10 00:00 16.1 65 17 9 3B SE 0 0 1021 4122 Overcast 100% cloud 06:00 14.3 68 17 9 3B S 0 0 1021 3159 Overcast 100% cloud 12:00 13.2 73 12 6 2B S 0 0 1021 3154 Overcast 100% cloud 18:00 18.6 61 11 6 2B SW 0.03 0 1022 3155 Cloudy 62% cloud Monday, 26/10 00:00 16.4 80 1 0 0B SW 0.12 0 1023 3156 Overcast 99% cloud 06:00 14 91 11 6 2B NW 0 0 1024 3167 Clear 3% cloud 12:00 12.5 94 15 8 3B N 0 0 1028 3186 Partly cloudy 46% cloud 18:00 16.7 74 11 6 2B NE 0.01 0 1029 3202 Overcast 96% cloud Tuesday, 27/10 00:00 15.6 77 8 4 2B NE 0.00 0 1028 3196 Overcast 100% cloud |
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