The set up was a broad longwave trough in place over much of the Bering Sea through southern Alaska. Embedded in this broad longwave trough was an upper level low meandering over the Yukon-Kuskokwim Delta. Multiple upper level shortwaves rotated around this upper level low along with a jet stream aimed right up Cook Inlet into Southcentral. The southwesterly flow at 700 millibars was also very moist with all this moisture being advected northeastward into the Cook Inlet region and Mat-SU Valleys. As a result, heavy rain occurred throughout the region resulting in flooding for some areas.

Flood in MATANUSKA VALLEY, ALASKA
From 08-AUG-22 08:39:00 to 10-AUG-22 11:52:00 (AKST-9)
Location: WASILLA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flooding was verified by Alaska State Troopers in Wasilla. The Regional Operations Center and the State Emergency Operations Center reported on August 8th, 2022 at approximately 22:09 hours, Alaska State Troopers (AST) began receiving multiple 911 calls reporting flooding in the area of Schrock Road and Sitze Road in Wasilla.  AST responded to the area discovering the road has been washed out and is impassible just past the Little Susitna River Bridge due to a culvert failing.  Matsu Borough along with DOT is on scene working to repair the culvert and roadway.  It���s also been advised there is a bridge farther down Sitze Road that may be compromised and is being assessed.  At this time, residence past this washout are un accessible.  Additional patrols of the area also discovered North Sushana Drive is impassible due to the Little Susitna River flooding the road.  These neighborhoods are also un accessible at this time. There were pictured posted on social media from the Alaska State Department of Transportation. SEOC also forwarded maps & pics of flooding in Houston. A news article with pictures can be seen here: https://www.adn.com/alaska-news/mat-su/2022/08/09/mat-su-flooding-closes-roads-threatens-homes-after-deluge-soaks-talkeetna-mountains/.

Flood in SUSITNA VALLEY, ALASKA
From 08-AUG-22 08:39:00 to 11-AUG-22 00:00:00 (AKST-9)
Location: NANCY LAKE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Anchorage Daily News published a story about the flooding in Houston from heavy rain that fell over the Talkeetna Mountains August 8.  Numerous roads were closed in the Houston, AK township and up to 20 properties were affected. Flooding in the town of Houston and surrounding roads was widespread.   https://www.adn.com/alaska-news/mat-su/2022/08/09/mat-su-flooding-closes-roads-threatens-homes-after-deluge-soaks-talkeetna-mountains/  Flooding on the Little Susitna River at Houston reached a crest of 12.52 ft on August 10, 2022 at 5PM AKDT which was moderate flood stage.

Flood in SUSITNA VALLEY, ALASKA
From 10-AUG-22 12:14:00 to 11-AUG-22 12:15:00 (AKST-9)
Location: NANCY LAKE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Numerous roads and low lying properties were reported to be flooded Monday night and Tuesday downstream from the Parks Highway Bridge and were impacted by flood waters for about 24-36 hours.

Flood in MATANUSKA VALLEY, ALASKA
From 10-AUG-22 12:14:00 to 11-AUG-22 12:15:00 (AKST-9)
Location: WASILLA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Numerous roads and low lying properties were reported to be flooded Monday night and Tuesday downstream from the Parks Highway Bridge and were impacted by flood waters for about 24-36 hours.