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Current US Threat Advisory Level
Grand Rapids, Michigan, United States
| Today | Tonight | Friday | Friday Night |
Saturday | Saturday Night |
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| Snow Showers |
Flurries | Snow Showers |
Snow Showers |
Mostly Sunny |
Partly Cloudy |
| Hi: 31°F |
Lo: 18°F | Hi: 29°F |
Lo: 18°F | Hi: 35°F |
Lo: 25°F |
Expires: 530 PM EDT THU NOV 20 2008
- KGRR is at: Grand Rapids, Gerald R. Ford International Airport
- In the state of: (MI)
- In the country of United States (US)
- Station Latitude = 42.88N (decimal)
- Station Longitude = 85.52W (decimal)
- Station Elevation = 242 (meters)
- Time Zone = Eastern Daylight Time (EDT)
- Time Zone Offset from GMT = -4* (hours)
The International Civil Aviation Organization (ICAO), an agency of the United Nations, codifies the principles and techniques of international air navigation. The ICAO Code is a 4-letter airport code used to determin current conditions at that location at the time of request.
Wind Speed: NW 17 MPH G 23
Barometer: 30.13 in.
Dewpoint: 23°F
Heat Index: 34°F
Wind Chill: 23°F
Mostly cloudy with a 30 percent chance of snow showers. Highs in the lower 30s. Northwest winds 15 to 20 mph.
Sunrise: 8:40 AM EDT
Partly cloudy with a chance of flurries. Lows 15 to 20. Northwest winds 10 to 15 mph.
Moon Phase: Waning Crescent MoonSunset: 6:15 PM EDT
Dusk: 6:46 PM EDT
Snow showers likely. Snow accumulation an inch or less. Highs in the upper 20s. Northwest winds around 15 mph. Chance of snow 70 percent.
Sunrise: 8:42 AM EDT
Mostly cloudy then becoming partly cloudy. A 30 percent chance of light snow showers. Lows 15 to 20. West winds 5 to 15 mph becoming light.
Moon Phase: Waning Crescent MoonSunset: 6:14 PM EDT
Dusk: 6:45 PM EDT
Mostly sunny. Highs in the mid 30s. Southwest winds 5 to 10 mph.
Sunrise: 8:43 AM EDT
Partly cloudy. Lows in the mid 20s.
Moon Phase: Waning Crescent MoonSunset: 6:13 PM EDT
Dusk: 6:44 PM EDT
Moon Phase: The phases of the Moon are related to (actually, caused by) the relative positions of the Moon and Sun in the sky. For example, New Moon occurs when the Sun and Moon are quite close together in the sky. Full Moon occurs when the Sun and Moon are at nearly opposite positions in the sky - which is why a Full Moon rises about the time of sunset, and sets about the time of sunrise, for most places on Earth.
Waning Crescent Moon: The Moon appears to be partly but less than one-half illuminated by direct sunlight. The fraction of the Moons disk that is illuminated is decreasing.
Twilight: Also known as "Dawn" preceding Sunrise and "Dusk" following Sunset. There are three kinds of twilight defined: civil twilight, nautical twilight, and astronomical twilight. For computational purposes, civil twilight begins before sunrise and ends after sunset when the geometric zenith distance of the center of the Sun is 96 degrees - 6 degrees below a horizontal plane. The corresponding solar zenith distances for nautical and astronomical twilight are 102 and 108 degrees, respectively. That is, at the dark limit of nautical twilight, the center of the Sun is geometrically 12 degrees below a horizontal plane; and at the dark limit of astronomical twilight, the center of the Sun is geometrically 18 degrees below a horizontal plane.
Sunrise and sunset: For computational purposes, sunrise or sunset is defined to occur when the geometric zenith distance of center of the Sun is 90.8333 degrees. That is, the center of the Sun is geometrically 50 arcminutes below a horizontal plane. For an observer at sea level with a level, unobstructed horizon, under average atmospheric conditions, the upper limb of the Sun will then appear to be tangent to the horizon. The 50-arcminute geometric depression of the Sun's center used for the computations is obtained by adding the average apparent radius of the Sun (16 arcminutes) to the average amount of atmospheric refraction at the horizon (34 arcminutes).
Accuracy of rise/set computations: The times of rise and set phenomena cannot be precisely computed, because, in practice, the actual times depend on unpredictable atmospheric conditions that affect the amount of refraction at the horizon. Thus, even under ideal conditions (e.g., a clear sky at sea) the times computed for rise or set may be in error by a minute or more. Local topography (e.g., mountains on the horizon) and the height of the observer can affect the times of rise or set even more. It is not practical to attempt to include such effects in routine rise/set computations.