Understanding Weather Forecast Terminology: A Comprehensive Guide

Weather forecasts use specific terminology to convey atmospheric conditions. Understanding these terms can help you interpret forecasts accurately.

Sky Conditions

Sky conditions describe the extent of cloud cover:

• Clear/Sunny: 1/8 or less of the sky covered by clouds.
• Mostly Clear/Mostly Sunny: 1/8 to 3/8 cloud cover.
• Partly Cloudy/Partly Sunny: 3/8 to 5/8 cloud cover.
• Mostly Cloudy: 5/8 to 7/8 cloud cover.
• Cloudy: 7/8 to 8/8 cloud cover.

If a high probability of precipitation (60% or greater) is expected, the sky condition may be omitted, as it's inferred from the precipitation forecast. (weather.gov)

Temperature Ranges

Temperature forecasts often use descriptors:

• Around 50/Near 50: Temperatures ranging from 48°F to 52°F.
• Lower 50s: Temperatures between 50°F and 54°F.
• Mid 50s: Temperatures between 53°F and 57°F.
• Upper 50s: Temperatures between 56°F and 59°F.
• 50s: Temperatures ranging from 50°F to 59°F.

These descriptors help convey expected temperature ranges without specifying exact numbers. (weather.gov)

Wind Descriptions

Wind forecasts include direction and speed:

• Light Wind: 0-5 mph.
• Breezy: 15-25 mph.
• Windy: 20-30 mph.
• Very Windy: 30-40 mph.
• Strong/Dangerous: 40 mph or greater.

These terms help convey the expected wind conditions. (weather.gov)

Precipitation Probability

The Probability of Precipitation (POP) indicates the likelihood of measurable precipitation:

• 0%: None.
• 10%: Isolated.
• 20%: Slight Chance.
• 30-50%: Chance.
• 60-70%: Likely.
• 80-100%: Occasional or Periods of.

These percentages help convey the expected likelihood of precipitation. (weather.gov)

Understanding these terms can enhance your ability to interpret weather forecasts accurately.