Significant and Catastrophic Flooding in the Pacific Northwest; Very Cold Temperatures in the Northern Plains

The atmospheric river over the Pacific Northwest will begin to subside today, but lingering rainfall will exacerbate ongoing catastrophic major river flooding, and landslides will continue across portions of western Washington and northwest Oregon for several days. Arctic air will plummet southward into the Northern Plains today, bringing cold air in the single digits to the region by Friday. Read More >

Overview

Several rounds of showers and thunderstorms with heavy rain pushed across portions of the Missouri Ozarks and extreme southeast Kansas during the period from the evening of July 6th into the morning of July 10th. Severe weather also occurred with some of these storms, including two tornadoes on July 9th.

A frontal boundary and several upper disturbances interacted with near tropical like moisture to produce very efficient rainfall rates throughout the event. Training of storms across the same locations and heavy rain falling in locations which experienced heavy rain and flooding in late June brought about some significant flash flooding during the week long event.

Caption

Tornado
Radar
Rainfall

Tornadoes:

Tornado - 4 N Ava
Douglas County

Date	July 9th, 2015
Time (Local)	3:00 pm - 3:03 pm
EF Rating	EF-0
Est. Peak Winds	80 mph
Path Length	1.4 miles
Max Width	100 yards
Injuries/Deaths	none
Summary: Numerous trees uprooted along the path.

Track Map

Tornado - 5 NE AVA
Douglas County

Date	July 9th, 2015
Time (Local)	3:05 pm - 3:08 pm
EF Rating	EF-0
Est. Peak Winds	80 mph
Path Length	2.3 miles
Max Width	100 yards
Injuries/Deaths	none
Summary: Numerous trees uprooted along its path.

Track Map

Downloadable KMZ File

The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:

EF0 Weak 65-85 mph	EF1 Moderate 86-110 mph	EF2 Significant 111-135 mph	EF3 Severe 136-165 mph	EF4 Extreme 166-200 mph	EF5 Catastrophic 200+ mph