Ripe For More Flash Flooding. I'm increasingly concerned about a train-echo effect, a conga-line of thunderstorms forming along an east-west warm frontal boundary over southern Minnesota. More clusters of strong to severe storms are moving into the metro, a pattern which may be repeated much of the night. If this keeps up we could be faced with very serious flooding by Saturday morning. Stay alert, and if you live in a flood-prone area be ready to move. NWS Doppler at 9:13 pm.
Multi-Million Dollar Storm? That's a WAG on my part, but based on some of the photos I'm seeing, and the scope of the straight-line winds that blew thru, I suspect damage will run into the (many) millions of dollars from today's rain and wind. There's no evidence of tornadic winds, but straight-line winds were strong enough (60-80 mph) to bring down big trees. Photo from South Minneapolis (upper right) courtesy of Dominic Hanzely. Photo from Uptown (upper right) from Walt Kruhoeffer.
Big Trees Down. Walt Kruhoeffer sent in this photo from Uptown, the scene right outside his apartment window - big trees down, still no power.
Serious Flash Flooding These are Doppler radar estimates of rainfall amounts from the severe cell that pushed across the metro area between 6:30 and 8 pm, whipping up 70 mph (straight-line) winds. Ground already saturated from early morning storms made it easier for trees to topple over, and there are numerous reports of trees down across the metro area from this severe storm. NO EVIDENCE OF A METRO TORNADO. I suspect these were almost entirely straight-line winds from a small, compact, derecho-like severe storm.
Stay Home. If you don't have to travel this evening stay put. If power is out, chances are you're not reading this, but I'm worried about people stepping on downed power lines. I drove into this mess after appearing on TPT Almanac. It was like driving into a 15 minute hurricane, total white-out, like being in a warm weather blizzard, waves of wind buffeting vehicles, many drivers parked under bridges on I-394. I saw numerous (big) trees down, many roads blocked, too many power outages to count and street lights out. What a mess.
Ripe. With a vigorous warm frontal boundary draped over southern Minnesota we may see a "train echo effect" overnight. Much like the cars of a train passing over the same section of track, strong to severe thunderstorms may keep redeveloping over the same counties, each one squeezing out 1-2" rain. The result may be serious flooding, and a Flash Flood Watch remains in effect for much of Minnesota into Saturday. Take the flood risk seriously.
Flash Flood. Lee Huffman sent me this photo from the Loring Park, Minneapolis area this evening, about 2-3 feet of water overwhelming vehicles and people just trying to wade thru the instant-flood.
Incredible Rains. 2.2" of rain in 30 minutes in Maple Plain. That's 2 week's worth. It shows you how much water is floating overhead. Any rain from additional storms will immediately run off into streets, streams and basements. If you often experience spring flooding you may have a long weekend ahead of you.
* Click here for the latest damage metro reports from NOAA.