Non-Precipitation

Non-Precipitation

NWS Norman watch, warning and advisory criteria for non-precipitation
Wind Advisory
Issued when sustained winds of 30 to 39 mph are expected for 1 hour or longer.

High Wind Warning
Issued when sustained winds of 40 mph or more are expected for 1 hour or longer, or for wind gusts of 58 mph or more with no time limit. A High Wind Watch is issued when these conditions may be met 12 to 48 hours in the future.

Dense Fog Advisory
Issued when fog is expected to reduce visibilities to 1/4 mile or less.

Heat Advisory
Issued when maximum daytime heat index values are expected to reach or exceed 105°F on at least 2 consecutive days, with intermediate low temperatures of 75°F or higher.

Excessive Heat Warning
Issued when maximum daytime heat index values are expected to reach or exceed 110°F on at least two consecutive days, with intermediate low temperatures of 75°F or higher. An Excessive Heat Watch is issued when these conditions may be met 12 to 48 hours in the future.

Frost Advisory
Issued when nighttime minimum temperatures are expected to range from 33°F to 36°F in the growing season.

Freeze Warning
Issued when nighttime minimum temperatures are expected to reach 32°F or lower in the growing season. They are usually issued to highlight the first few freezes of the fall, or unusually late freezes in the spring. A Freeze Watch is issued when these conditions may be met 12 to 48 hours in the future.

Air Stagnation Advisory
Issued only at the request of the Environmental Protection Agency (EPA), whenever atmospheric conditions are stable enough to cause air pollutants to accumulate in a given area.

Blowing Dust Advisory
Issued when blowing dust is expected to reduce visibility to between 1/4 and 1 mile, generally with winds of 25 mph or greater.

Dust Storm Warning
Issued when blowing dust is expected to reduce visibility frequently to 1/4 mile or less, generally with winds of 25 mph or more.

Dense Smoke Advisory
Issued when smoke is expected to reduce visibility to 1/4 mile or less.

Fire Weather Watch
Issued when dry vegetation and conditions favoring extreme fire danger are expected 12 to 72 hours in the future.

Red Flag Warning
Issued when dry vegetation and conditions favoring extreme fire danger are expected, generally within 24 hours.
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