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High and Low Pressure Forecast
High and Low Pressure Forecast
H = High pressure (trade winds, nice cool air, blue sky, sunshine and good weather)
H = High pressure (trade winds, nice cool air, blue sky, sunshine and good weather)
L = Low pressure (warm humid air that brings cloudy sky and rain showers)
L = Low pressure (warm humid air that brings cloudy sky and rain showers)
General Information
-High Pressure:
Clear Skies
Light Winds
Settled Weather
Isobars are quite far apart
Travel clockwise in Northern Hemisphere
-Low Pressure:
Strong Winds
Heavy Rains
Unsettled Weather
Isobars are close together
Travel counter clockwise in southern Hemisphere
-Cold Front: Blue Line with triangle on it
-Warm Front: Red Line with half circles on it
-Occludded Front: Purple Lines with triangles & half circles on it Occurs when a cold front catches up to see warm front Clouds & Rainfall
-Weakening Warm front: Red half circles & triangles separated by an X A front that is starting to dissipate Cloud & Rainfall start to disappear
-Trough: Thick black line Increasing cloud cover & increase chance of rain
A long area of low surface pressure
-Average Sea Level pressure is 1013 MB.
Below 1013 is low pressure & above is high pressure
Hurricane, Typhoon and Cyclone Storms
Hurricane, Typhoon and Cyclone Storms
Category 1 winds 74-95 mph surge 3-5 feet
Category 1 winds 74-95 mph surge 3-5 feet
Category 2 winds 96-110 mph surge 6-8 feet
Category 2 winds 96-110 mph surge 6-8 feet
Category 3 winds 111-130 mph surge 9-12 feet
Category 3 winds 111-130 mph surge 9-12 feet
Category 4 winds 131-155 mph surge 13-18 feet
Category 4 winds 131-155 mph surge 13-18 feet
Category 5 winds 155+ mph surge 19 feet or higher
Category 5 winds 155+ mph surge 19 feet or higher
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