From the National Weather Service glossary:
Advisory
(Abbrev. ADVY)- Highlights special weather conditions that are less serious
than a warning. They are for events that may cause significant
inconvenience, and if caution is not exercised, it could lead to situations
that may threaten life and/or property.
Watch
A watch is used when the risk of a hazardous weather or hydrologic event has
increased significantly, but its occurrence, location, and/or timing is
still uncertain. It is intended to provide enough lead time so that those
who need to set their plans in motion can do so.
Warning
A warning is issued when a hazardous weather or hydrologic event is
occurring, is imminent, or has a very high probability of occurring. A
warning is used for conditions posing a threat to life or property.
----- Original Message -----
From: "Kim Noyes" <kimnoyes@gmail.com>
To: "CaliforniaDisasters" <californiadisasters@yahoogroups.com>
Sent: Saturday, July 24, 2010 10:39 PM
Subject: [californiadisasters] Watches? Warnings? What's the Difference?
*Watches? Warnings? What's the Difference?*
Although not as common as in other parts of the country, severe
thunderstorms do occur over the Pacific Northwest and Northern California.
The summer season is frequently when severe thunderstorms flare up. However,
severe thunderstorms can occur during other times of the year. Do you know
what it means when a Severe Thunderstorm Watch is issued? What about a
Severe Thunderstorm Warning? How can these help you stay safe?
A Severe Thunderstorm Watch is issued by the National Weather Service's
Storm Pre-diction Center (SPC) based in Norman, Oklahoma. SPC meteorologists
issue fore-casts and watches related to severe thunder-storms and tornadoes
across the nation, while also monitoring for heavy rain, heavy snow, and
fire weather concerns. A Severe Thunderstorm Watch highlights an area where
an organized episode of hail one inch in diameter or larger and/or damaging
thun-derstorm winds are possible during a three-to eight-hour period.
Watches can cover a large area, as evident by the picture to the right.
Watches are not issued for all severe thunderstorms, as many storms affect a
small area for a short period of time; watches are intended for areas where
well-organized or significant severe weather is possible or where the threat
of severe weather will last for a long period of time.
Severe Thunderstorm Warnings are issued by your local National Weather
Service of-fice, which is Medford, Oregon, in this case. A warning means
severe weather is expected to occur within a very short period of time in
your area (generally within an hour) or has already been observed. A severe
thunder-storm is defined as having either one-inch diameter hail or larger
and/or thunderstorm winds exceeding 58 mph. A severe thun-derstorm warning
serves as a notice that you should seek shelter immediately. Warnings are
storm-based, meaning they cover a much smaller area compared to watches and
are more specific to a particular storm or storms, often encompassing the
area a storm serves as an immediate threat to or its expected track.
Remember, lightning and heavy rain are not criteria for a severe
thunderstorm warning to be issued. For more severe weather information,
visit the SPC website at: http://www.spc.noaa.gov.
Source: http://www.wrh.noaa.gov/mfr/skywarn/summer2010.pdf
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