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Product Guide: Non-Precipitation
Products
There can be other hazards besides precipitation and
thunderstorms. Heat, cold, fog, dust, and wind can all have an
impact. That is why the National Weather Service issues
watches, warnings, and advisories related to these hazards.
| Heat Advisory (NPW) |
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A "Heat Advisory"
is issued when the heat index will reach 110 degrees
or higher for 2 consecutive days, with temperatures
not getting cooler than 75 degrees at night.
An "Excessive Heat Warning" is issued
when the heat index will reach 120 degrees or higher
for 2 consecutive days, with temperatures not below
75 degrees at night.
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| Freeze Warning (NPW) |
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A"Freeze Warning"
will typically be issued in the spring or fall growing
season if temperatures are expected to be at or
below 32 degrees Fahrenheit for at least 3 consecutive
hours. In the fall, this advisory will be
issued until a killing freeze occurs. Other freeze
warnings may be issued for pipe-bursting freezes,
and freezes after spring vegetation is already in
bloom.
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| Wind Advisory (NPW) |
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A "Wind Advisory"
is generally issued for sustained winds of 25 mph
or greater that will persist for an hour or more.
If caution is not exercised, the wind could be hazardous
to high profile vehicles.
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| High Wind Watch (NPW) |
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A "High Wind Watch" is
an alert to the potential for sustained winds of 40 mph or
higher, and gusts to 58 mph. A watch may be issued
from 6 to 24 hours in advance of the occurrence of the
event.
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| High Wind Warning (NPW) |
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A "High Wind Warning"
is issued for sustained winds of 40 mph or higher and gusts
to 58 mph.
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| Dense Fog Advisory (NPW) |
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A "Dense Fog Advisory"
is issued when widespread visibilities are expected to be
less than 1/4 mile for any extended period of time. If
temperatures are below freezing, ice could form on bridges
and overpasses.
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| Blowing Dust Advisory (NPW) |
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A "Blowing Dust
Advisory" is issued when widespread visibilities are at
or below 1 mile but greater than 1/4 mile, due to blowing
dust, for any extended period of time.
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| Dust Storm Warning (NPW) |
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A "Dust Storm Warning"
is issued when strong winds produce blowing dust and
visibilities less than 1/4 mile for an extended period of
time. This would only happen during a very extended
dry period.
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National Weather Service Forecast Office
