A big evening activity around here is to sit in some spot where you can watch the sun set with a sundowner (a drink). Some of the people here who do this on a regular basis say they have seen the 'green flash' several times.
The green flash can range from non-existant to spectacular depending on the atmosphere. In "standard" atmosphere it will be small and appear right at the horizon. If there is a temperature inversion it may look like a small flash just above the horizon.
If you watch as the lower limb approaches the horizon you can sometimes predict the flash. If the sun forms "feet" as it gets close to the horizon watch for a green oval flash just above the horizon about 4 minutes later..
A high pressure system settling in over southeast with a combination of crisp clear skys and winds in the teens are have optimum conditions. The best sky and wind combination is crisp clear sky w/ very small % cloud cover (few IF any/ few better/ none optimal) and winds out of E in the mid-upper teens ..... the majority of green flashes are Oct-Dec
Conditions necessary to see the Green Flash are the "blaring ball" sunsets, clear crisp skys few if any clouds anywhere on horizon/winds east in mid-upper teens Viewing from Hawk Channel & not the gulf...
Dress Code: Explanation: Just as the upper limb of the sun drops below the horizon the acute angle of sunset the atomsphere acts as a prism breaking the light into a spectrum. The blues and violets get absorbed so green is the last color visable.
And even if you don't see the green flash, you usually get to watch a wonderful sunset.