Cumulonimbus - squall line associated with cold front.

Cumulonimbus - squall line associated with cold front.

Cold front approaching.

Cold front approaching.

Cold front approaching.

Clouds showing appearance of breaking waves east of the continental divide.

Lenticular cloud over the Inyo Mountains.

Nimbostratus clouds.

Nimbostratus clouds.

Nimbostratus clouds with heavy precipitation.

Stratocumulus clouds.

Stratocumulus clouds.

Distant rain showers from smooth wavy stratocumulus cloud layer.

Stratus cloud deck.

Stratus clouds.

Stratus clouds.

Stratus clouds.

Stratus clouds.

Low stratus clouds. ,

Early morning lake fog.

Early morning lake fog.

Early morning lake fog.

Early morning ground fog.

Early morning lake fog

Early morning lake fog.

Early morning lake fog.

The old Ionospheric Prediction Service solar observatory in Australia. This facility was shared with CSIRO.

Diagram of the effects of a solar flare.

Diagram of the effects of a solar flare.

A huge solar flare on the bottom left of the photograph.

John Bortniak monitoring solar activity at the Mauna Loa Observatory.

Construction of the new Ionospheric Service Solar Observatory at Culgoora.

8 Balonne Street, Narrabri. Home for the U.S. solar observer while in Australia .

The coronagraph at the Mauna Loa Observatory.

Climber on the Flatirons silhouetted against a setting sun.

Plate I of "Studies among the Snow Crystals ... " by Wilson Bentley, "The Snowflake Man." From Annual Summary of the "Monthly Weather Review" for 1902. Bentley was a bachelor farmer whose hobby was photographing snow flakes.

Plate II of "Studies among the Snow Crystals ... " by Wilson Bentley, "The Snowflake Man." From Annual Summary of the "Monthly Weather Review" for 1902. Bentley was a bachelor farmer whose hobby was photographing snow flakes.

Plate III of "Studies among the Snow Crystals ... " by Wilson Bentley, "The Snowflake Man." From Annual Summary of the "Monthly Weather Review" for 1902. Bentley was a bachelor farmer whose hobby was photographing snow flakes.

Plate III of "Studies among the Snow Crystals ... " by Wilson Bentley, "The Snowflake Man." From Annual Summary of the "Monthly Weather Review" for 1902. Bentley was a bachelor farmer whose hobby was photographing snow flakes.

Plate V of "Studies among the Snow Crystals ... " by Wilson Bentley, "The Snowflake Man." From Annual Summary of the "Monthly Weather Review" for 1902. Bentley was a bachelor farmer whose hobby was photographing snow flakes.

Plate VI of "Studies among the Snow Crystals ... " by Wilson Bentley, "The Snowflake Man." From Annual Summary of the "Monthly Weather Review" for 1902. Bentley was a bachelor farmer whose hobby was photographing snow flakes.

Plate VII of "Studies among the Snow Crystals ... " by Wilson Bentley, "The Snowflake Man." From Annual Summary of the "Monthly Weather Review" for 1902. Bentley was a bachelor farmer whose hobby was photographing snow flakes.

Plate VIII of "Studies among the Snow Crystals ... " by Wilson Bentley, "The Snowflake Man." From Annual Summary of the "Monthly Weather Review" for 1902. Bentley was a bachelor farmer whose hobby was photographing snow flakes.

Plate IX of "Studies among the Snow Crystals ... " by Wilson Bentley, "The Snowflake Man." From Annual Summary of the "Monthly Weather Review" for 1902. Bentley was a bachelor farmer whose hobby was photographing snow flakes.

Plate X of "Studies among the Snow Crystals ... " by Wilson Bentley, "The Snowflake Man." From Annual Summary of the "Monthly Weather Review" for 1902. Bentley was a bachelor farmer whose hobby was photographing snow flakes.

Plate XI of "Studies among the Snow Crystals ... " by Wilson Bentley, "The Snowflake Man." From Annual Summary of the "Monthly Weather Review" for 1902. Bentley was a bachelor farmer whose hobby was photographing snow flakes.

Plate XII of "Studies among the Snow Crystals ... " by Wilson Bentley, "The Snowflake Man." From Annual Summary of the "Monthly Weather Review" for 1902. Bentley was a bachelor farmer whose hobby was photographing snow flakes.

Plate XIII of "Studies among the Snow Crystals ... " by Wilson Bentley, "The Snowflake Man." From Annual Summary of the "Monthly Weather Review" for 1902. Bentley was a bachelor farmer whose hobby was photographing snow flakes.

Plate XIV of "Studies among the Snow Crystals ... " by Wilson Bentley, "The Snowflake Man." From Annual Summary of the "Monthly Weather Review" for 1902. Bentley was a bachelor farmer whose hobby was photographing snow flakes.

Plate XV of "Studies among the Snow Crystals ... " by Wilson Bentley, "The Snowflake Man." From Annual Summary of the "Monthly Weather Review" for 1902. Bentley was a bachelor farmer whose hobby was photographing snow flakes.