San Diego River trees recover from microburst.

The roots are almost completely torn out of the ground, but the stubborn tree in spring has green leaves!
The roots were almost completely torn out of the ground, but the stubborn tree in spring has green leaves!

Perhaps you read my blog post about the violent microburst that tore through San Diego’s Mission Valley on September 16, 2014. Along with photos of the aftermath, I described the tornado-like winds of the freak weather phenomenon.

A microburst is a localized downdraft of wind that can occur under unstable weather conditions. Several areas around San Diego were struck by a microburst that day, and the resulting damage was stunning. Small airplanes at an airport were tossed through the air.  Along the banks of the San Diego River, hundreds of trees were torn to shreds and uprooted.

This morning, 7 months later, I walked along the river path where I had scrambled over thickly fallen trees right after the natural disaster.

Many of the uprooted trees were removed by crews with chainsaws in the days that followed the microburst. But some were not. Check out a few pics from my walk this spring morning! Like the famous quote from the movie Jurassic Park, life finds a way!

One of hundreds of trees that were uprooted during the super violent microburst last September.
One of hundreds of trees that were uprooted during the super violent microburst last September.  Amazingly, this one still flourishes!
This fallen tree is now growing horizontally like a hedge along a Mission Valley sidewalk!
This fallen tree is now growing horizontally like a hedge along a Mission Valley sidewalk!
Sign beside the San Diego River Trail. Why fallen trees are okay! There are important benefits to the soil, flora and fauna.
Sign beside the San Diego River Trail. Why fallen trees are okay! There are important benefits to the soil, flora and fauna.

The sign reads:

When a tree falls most people want to remove it from where it has fallen. However, sometimes it is best if we urge people not to be too quick to tidy up. It is often very beneficial to leave the tree, mound of soil, rocks and roots lifted by the tree if they aren’t in the way or dangerous.

The soil eventually will settle as the wood rots, and these tree-root soil mounds are the real “windfall” for some plants and animals. Consider these examples: The bare soil on the mound is home for several mosses that prefer a drier spot free of competition. The space under the lifted roots makes a good place for an animal to dig a breeding den. Wet soil left behind can make a temporary pool for amphibians.

Green shoots look unusual on violently torn tree trunk. I believe this is a Fremont Cottonwood.
Green shoots look unusual on this violently torn tree trunk. I believe this is a Fremont Cottonwood.
Life springs from a broken stump after a devastating natural disaster.
Life springs forth from a broken stump months after a devastating natural disaster.

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Microburst destroys trees along San Diego River.

Large trees by San Diego River snapped by sudden violent microburst winds.
Large trees by San Diego River snapped by sudden violent microburst winds.

Late yesterday, a few minutes after five o’clock, a violent microburst tore through Mission Valley, several miles north of downtown San Diego. Similar microbursts occurred elsewhere around the city and county, bringing thunder and lightning, torrential downpours and extremely violent winds. San Diegans saw on the news how many small airplanes parked at Montgomery Field in Kearny Mesa (a few miles farther north) were thrown through the air and overturned like mere toys.

I was fortunate. I left the place where I work in Mission Valley half an hour early. Many of my coworkers weren’t so fortunate. One, walking to the Hazard Center trolley station, took shelter in a grocery store while the wind, sounding like an oncoming tornado, knocked over sturdy steel shopping cart corrals in the parking lot with ease. He reported the fury of the storm only lasted a few minutes.

Early this morning I walked along the pathway that follows the north side of the San Diego River. For better than a mile, from Qualcomm Way west well past Mission Center Road, I photographed the aftermath of the terrifying microburst. The amount of damage to the river’s lush canopy of trees was indescribable. Hundreds of trees, large and small, were torn to pieces or uprooted by the brief microbust.

These pics aren’t so cool, but they are interesting…

Popular pathway through Mission Valley is covered with miles of fallen trees.
Popular pathway through Mission Valley is covered with miles of fallen trees.
Walking along the river required fancy footwork the morning after the freak storm.
Walking along the river required fancy footwork the morning after the freak storm.
One of many trees torn to pieces next to residential buildings.
One of many trees torn to pieces next to residential buildings.
The late summer microburst came on a very hot, humid San Diego day.
The late summer microburst came on a very hot, humid San Diego day.
San Diego River seen behind devastated trees near walking path.
San Diego River seen behind devastated trees near walking path.
This hurricane-like rainstorm ended so quickly no severe flooding occurred.
This hurricane-like rainstorm ended so quickly no severe flooding occurred.

This sign talks about the history of flooding in Mission Valley, and how nature occasionally flushes out accumulated debris and keeps the river healthy. Because the storm was so brief, nature didn’t create much flooding yesterday–but it certainly created quite a bit of debris!

Many trees around the developed parts of Mission Valley were also uprooted!
Many trees around the developed parts of Mission Valley were also uprooted!

Tree trimming businesses and city workers converged in full force on Mission Valley today! Many truckloads of branches were hauled off from all over!

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