Anchorage had flash floods and coastal flooding. A flash flood comes from washes, rivers, dry lakes, and basins. Most flash floods come from a significant amount of rain fall. This occurs with severe thunderstorm, hurricanes, tropical storm, or melt water from snow or ice sheets.
Anchorage is more typical to get flash flooding from ice melt then any other type of flash flooding.
With coastal flooding, many severe storms come from over the ocean and have heavy precipitation that can fall for a long period of time. The amount of rain that comes down can really effect on how big the flood can get. With snow melt and with anchorage being prone to snow, snow melt can increase flooding by a high percentage.
Snow melting occurs whens a subtropical moist air masses moves over snowy regions, usually during a late winter or early spring. also the ground is also frozen. this helps with runoff. the ground is not able to soak up any water so it stays above ground. Also with jet streams moving northward, ice melting happens.
Anchorage had a decent flood in 2015 on July 25. They had a significant 6 inches of rain in about 6 hours. This occurred during the late spring early summer. The jet stream was in the northern part of north america so Anchorage was prone to any tropical storms and cyclones being produced over the ocean. This specific storm was created by a tropical cyclone coming off the pacific ocean.
The flood lasted only 2 days. Many people were affected by the flood, for their basements were flooded and property damage was high.
This was significant to Anchorage because they are not used to many floods. They have many rives and a bay that Anchorage sits on. This was also significant due to the reason that 2015 was a very wet year for them. Also Anchorage had a positive impact with this flood due to drought the year before.
- Rauber. M. Robert, and John E. Wlash, and Donna J. Charlevoix. “Sever and Hazardous Weather“. Kendall Hunt Publishing. 2012. print.