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Severe Outlook
Watches/Warnings
-Definitions
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Satellite Images________
General Watches & Warnings
Weather Watch:
conditions favorable for development of severe weather in
watch area during posted time frame. Keep your eyes and ears open for changes.
Weather Warning:
severe weather is occurring or will be occurring in the near
future. Motion, direction, duration & composition are given for specific events.
Listen to weather statements and be prepared to take cover.
Weather Advisory:
actual/expected conditions may cause concern but not
serious enough to post warning at this time.
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Environment Canada issues many different types of
watches/warnings for adverse weather conditions. Below is a basic explanation of
these although in fall and spring combinations of all can occur.Watches/Warnings for Winter
| Frost
Warning: |
when temps forecast to fall near or below
freezing during growing season. |
| Freezing
Rain Warning: |
extended periods of freezing rain are
expected that can damage trees, overhead wires and cause hazardous driving conditions. |
| Heavy
Snowfall Warning: |
expect 15cm or more in 12 hours or less. |
| SnowSquall
Warning: |
local snowsqualls producing large amounts
(+10cms or more) in traditional snowbelt areas. |
| Blizzard
Warning: |
Snow or blowing snow, with severe wind-chill
and reduced visibility(>1km) for 4+hrs. |
| Winter
Storm Warning: |
when 2 or more winter warning conditions are
met(wind + snow). |
| Wind-Chill
Warning: |
very cold with windy conditions creating
hazardous outdoor temperatures. |
| Cold
Wave Advisory: |
temperatures to drop more than 20°C within
18hrs. |
| Flash
Freeze Warning: |
when forecast conditions will likely produce
rapid ice formation on road surfaces (rapid temp drop and significant precipitation prior
and during event). |
Watches/Warnings for Summer
| Severe
Thunderstorm Watch: |
favorable conditions for severe
thunderstorms with large hail, heavy rains, intense lightening or damaging winds. |
| Severe
Thunderstorm Warning: |
developed storm is producing some or all of
watch conditions above. Tornadoes may also be produced in severe thunderstorm
environment. |
| Tornado
Watch: |
favorable conditions for development of
tornadoes |
| Tornado
Warning: |
One or more tornadoes are on the ground or
forming. Listen to weather statements and take cover in lowest point of house or if
outside, ditches/culverts if in the path. |
| Heavy
Rain Warning: |
when rainfall can cause flooding. Expect
50mm over 12hrs or 80mm in less than 24 hrs. |
| Wind
Warning: |
steady winds at/above 60km/h or gusting to
90km/h or more for 1 hour or more. |
| Dust
Storm Advisory: |
mainly prairies where dust and high winds
reduce visibility to >1km. |
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