This anvil cloud laden with mammatus continues to blot out remaining blue sky in this view looking southeast at Lininger Park in Marion, Iowa around 5:25 PM, Tuesday, July 26, 2011. The anvil is also eclipsing a rapidly growing cumulonimbus calvus tower seen at lower right. The calvus cloud was located about 22 miles away in Jones County.
A dark sky north of Cedar Rapids and Marion, Iowa provided this star-studded view looking northwest from near the Hoffman Tree Farm off C Avenue, about .75 mile north of East Main Street. This image, a one-minute exposure shot at f/3.5, 400 ISO and a 18mm focal length, includes the entire constellation of Ursa Major (The Great Bear). City light pollution to the south precluded a good look at the Milky Way visible during this time and date of 9:50 PM, Wednesday, August 24, 2011.
A mix of lesser-pronounced mammatus clouds drift past in this view of the north sky along 335th Street about .15 mile south of the Minden, Iowa exit (Exit 29) from Interstate 80. The time and date was 3:55 PM, Saturday, April 9, 2011. The camera was positioned just outside a U-Stop convenience store, our storm chase team's first storm initiation waiting point. After grabbing some provisions and gas, we soon moved to a more open area (seen at background right with the large sign pole and dark dumpster), another .15 mile north of I-80. The mammatus clouds indicated a very moist, unstable level of atmosphere overlying a drier layer and hinted at the severe weather that arrived north of this position about two hours later. The severe weather system produced an outbreak of tornadoes moving across Western Iowa in a northeasterly direction.
This bank of cumulus clouds, whose tops are illuminated by a hidden sun, stretches across the southwest sky as seen from the corner of Progress Drive and Martha's Way in Hiawatha, Iowa around 7:20 AM, Thursday, July 28, 2011. The sky was becoming progressively cloudier at this point and strong thunderstorms arrived here about an hour and a half later.
Moving left-to-right 13 degrees above the northern horizon in this image, the International Space Station (ISS) created this light streak, a product of a 3.5 minute exposure taken from about 9:58-10:02 PM, Sunday, August 21, 2011. The image was shot from Echo Hill Presbyterian Church in Marion, Iowa. Polaris, the North Star, is seen at top (center-right), and The Big Dipper asterism at upper left. The blobs of light on the horizon are car headlights along C Avenue. Settings for this image included an f/3.5 aperture, 400 ISO and 18mm focal length. The ISS, traveling at an average ground speed of 17,227 mph, regained this same observation point from its previous orbital pass in just one hour and 34 minutes.
This large cumulonimbus anvil cloud in the southern sky as seen from Progress Drive in Hiawatha, Iowa was about an hour and a half in advance of the arrival of heavy thunderstorms in the area. The thunderstorms produced heavy rain and frequent lightning. 7:25 AM, Thursday, July 28, 2011.
The overhanging anvil of a building supercell rolls into the state of Iowa from Nebraska just before 6:00 PM, Saturday, April 9, 2011. This spot on Cherry Avenue (a dirt road) just .1-mile south of Highway 175 (background) was our second storm initiation waiting point for the day's chase and is located about 2.8 miles west of the Onawa, Iowa exit (Exit 112) from Interstate 29 or about one mile southwest of Lewis and Clark State Park. The image looks northwest. The powerful supercell began forming in eastern Nebraska just after 5:00 PM and by about 7:15 PM, it dropped its first tornado just southwest of Mapleton, Iowa--17.5 miles northeast of here. The tornado would later be rated an EF3, and damaged a large portion of the town around 7:30 PM. Many more tornadoes also formed from the system as it moved farther to the northeast. Unseasonably warm temperatures (81 degrees) and high dew points (73 degrees) on this day in western Iowa helped fuel the instability of the atmosphere.
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