Go to an example weather map. Look at the isobars, the solid lines that form curving patterns on the map. They are usually measured in millibars (mb) of pressure. Where the isobars close around a low value, you have a Low. Where they close around a high value, it's a High.
High values = greater than 1001 mb, e.g. 1012 in this example.
Low values = lower than 1000 mb, e.g. less than 996 in this example.
See another example weather map.
For an excellent animation of current windstreams, visit Ventusky.com.
Go to Oceanweather, Inc. On the left, click on North Atlantic, "Southern Region," then click the "Marine Observations" icon at the top of the page.
Note: On Oceanweather.com Marine Observations images, the first 2 digits of the isobar reading are dropped as part of the meteorologist's shorthand. So a high reading might appear as "26" (meaning 1026), while a low might look like "89" (meaning 989).
Kevin Goff and Susan Haynes, Virginia Institute of Marine Science
Hurricane, Northeaster, Noreaster, Low pressure, Wind barb, Coriolis, Fetch
Natl. Science Standards
IK-1 I5-2 PH5-2 PH5-3 ES5-1 ES5-3 ES9-1 TK-3 PS5-3 PS5-5 PS9-4 PS9-5 PS9-6 NK-1 N9-2
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