Understanding Weather Forecast Terminology: A Simplified Guide
Weather forecasts are essential for planning daily activities, but the terminology used can often be confusing. This guide simplifies common weather terms to help you interpret forecasts with ease.
Sky Conditions
Sky conditions describe the amount of cloud cover in the atmosphere:
- Clear/Sunny: 1/8 or less of the sky is covered by clouds.
- Mostly Clear/Mostly Sunny: 1/8 to 3/8 of the sky is covered.
- Partly Cloudy/Partly Sunny: 3/8 to 5/8 of the sky is covered.
- Mostly Cloudy: 5/8 to 7/8 of the sky is covered.
- Cloudy: 7/8 to 8/8 of the sky is covered.
These terms help you understand how much of the sky will be obscured by clouds during the forecast period. (weather.gov)
Temperature
Forecasts provide expected high and low temperatures for a specific period, typically in degrees Fahrenheit. For example, a forecast might state a high of 75°F and a low of 60°F for a particular day.
Wind
Wind forecasts indicate the direction and speed of winds:
- Light: 0-5 mph
- Breezy: 15-25 mph
- Windy: 20-30 mph
- Very Windy: 30-40 mph
- Strong/Damaging: 40 mph or greater
These descriptors help you gauge the strength of the wind and its potential impact on activities. (weather.gov)
Precipitation Probability
This term indicates the likelihood of measurable precipitation (e.g., rain, snow) occurring:
- 0%: No chance
- 10%: Isolated
- 20%: Slight chance
- 30-50%: Chance
- 60-70%: Likely
- 80-100%: Very likely
Understanding these percentages helps you prepare for potential weather events. (weather.gov)
Time Periods
Forecasts specify time frames for expected weather conditions:
- Today: Sunrise to sunset
- This Afternoon: Noon to 6 p.m.
- This Evening: 6 p.m. to sunset
- Tonight: Sunset to sunrise
These definitions help you understand when specific weather conditions are expected to occur. (forecast.weather.gov)
Additional Terms
- Advisory: Highlights special weather conditions that are less serious than a warning but may cause significant inconvenience.
- Warning: Issued to warn the public that a hazardous weather element is imminent or has a very high probability of occurrence.
- Watch: Alerts the public to the possibility of severe weather or some other hazardous weather element.
These terms help you understand the severity and immediacy of weather events. (weather.gov)
By familiarizing yourself with these terms, you can interpret weather forecasts more accurately and make informed decisions based on expected conditions.