By: Patrick Parker
There you sit, enjoying these last sultry days of summer. Yet I feel it’s my duty to remind you: Storms are brewin.’
The National Forecasters at NOAA have predicted the Atlantic coast will most likely have an above-normal number of hurricanes before the season officially ends on November 30th, with three to five of them likely to be “category 3” or higher. AccuWeather has forecasted snowfall for the mid-West and northern Plains as early as October. And what’s in store for the northeast and mid-Atlantic regions? Warmer fall temperatures will be accompanied by rain and windstorms, predicts AccuWeather scientists, with severe weather in November expected for Albany down to New York City and northern Jersey.
Hopefully, the most severe storms will weaken or blow out to sea before they cause us any trouble. But even storms of moderate intensity can threaten your trees — and the structures and people around them.
Wind, snow, and ice can snap trunks and branches. The ground saturation from heavy or sustained rainfall, particularly when coupled with high winds, can undermine a tree’s stability. Sometimes, trees topple. And when the failed trees are large ones – trunk diameters in excess of 12” — there is significant risk of property damage and serious injury to humans and pets.
A healthy, well-maintained tree is quite resilient in all sorts of conditions. But when it has been compromised by disease or structural deficiencies, stormy weather can cause real problems.
Poor Root System. A tree’s stability depends on the depth and strength of its root system. As the tree grows taller and its crown becomes larger, the roots have to work harder to hold the tree in place. Since roughly 90% of a tree’s roots are in the upper 18”-24” of soil, a poorly-developed, weak, or decayed root system can be severely compromised by even moderate amounts of ground saturation. That can cause the tree to lean, or (during high wind and/or rain events) to fall over completely.
Bad Form. A lopsided crown can cause a tree to lean to one side; a top-heavy crown puts undue stress on the lower trunk and root ball. A poorly-formed union of trunk and branches increases the likelihood that those limbs will fail during strong storms. These structural problems can be particularly troublesome for evergreens during storm season, since those issues adversely affect the trees’ wind resistance. That’s why all it can take is a strong gust of wind and soil saturation for some massive evergreen trees to be uprooted.
Decay. Decomposing trunk, branch, and root tissue has very little strength and is the most common contributor to tree failure.
All trees have the potential for some level of failure from the single or combined forces of wind, rain, snow, and ice. But good arboriculture practices will minimize injury to your trees.
Prune. Careful pruning by a certified arborist is one of the most important aspects of storm damage prevention. The proper trimming of an overgrown or unhealthy tree crown, the removal of dead/dying/diseased/decaying limbs, and the appropriate correction of poor trunk-branch unions, can restore structural integrity and wind resilience, and improve overall plant health.
Support. Tree-support systems such as cabling and bracing can be appropriate remedies for structural deficiencies and instability. When applied judiciously, and maintained correctly, these support systems can prevent the failure of a trunk or limb, extend the life of a mature tree, and provide added stability to newly-transplanted trees while they build supportive root systems.
Remove. Tree removal is sometimes necessary when decay, structural decline, or significant past storm damage makes a tree too dangerous to remain on your property.
Fortify. Keeping your tree healthy is the best defense against all the year-round challenges it faces. Appropriate watering and soil nutrition improves root growth and structure, making the tree more stable.
Selective pruning, cabling/bracing, and root nutrition can minimize winter damage, ensure the safety of humans, pets, and structures, and preserve the strength, shape and seasonal beauty of your trees.
Here is the latest from NOAA on Hurricane Irma:
WTNT41 KNHC 110903
Hurricane Irma Discussion Number 49
NWS National Hurricane Center Miami FL AL112017
500 AM EDT Mon Sep 11 2017
Irma is continuing to weaken as it moves across the western Florida
peninsula, with the eye dissipating and weakening banding near the
center. There are no recent observations of hurricane-force winds
near the center, but based on the premise that such winds still
exist over the Gulf of Mexico west of the center the initial
intensity is reduced to 65 kt. It should be noted that near-
hurricane force winds are occurring in a band well northeast of the
center with sustained winds of 60 kt reported in the Jacksonville
area. The cyclone should continue to weaken as it moves through
the southeastern United States, becoming a tropical storm later
today, a tropical depression by 36 h, and a remnant low by 48 h. The
large-scale models forecast Irma to dissipate completely by 72 h,
so the 72 h point has been removed from the forecast.
The initial motion is 340/16. The cyclone is expected to move
around the eastern side of a mid-level disturbance currently located
along the U.S. Gulf Coast, which should cause a north-northwestward
to northwestward motion until dissipation. The forecast track
takes the center across the eastern Florida Panhandle, southwestern
Georgia, eastern and northern Alabama, and eventually into western
1. There is the danger of life-threatening storm surge flooding
along portions of the coasts of Florida, Georgia and South Carolina,
where a Storm Surge Warning remains in effect.
2. Irma will continue to bring life-threatening wind impacts to much
of central and north Florida, with hurricane-force winds near the
center. Also, Irma is a large hurricane, and hurricane-force wind
gusts and sustained tropical-storm force winds extend far from the
center. Wind hazards from Irma will continue to spread northward
through Georgia and into portions of Alabama, Tennessee, South
Carolina, and North Carolina.
3. Irma continues to produce very heavy rain and inland flooding
across much of the northern peninsula and eastern panhandle of
Florida and southern Georgia, which is quickly spreading to the rest
of the southeast United States. Intense rainfall rates of 2 inches
or more per hour is leading to flash flooding and rapid rises on
creeks, streams, and rivers. Significant river flooding is likely
over the next five days in the Florida peninsula and southern
Georgia, where average rainfall totals of 8 to 15 inches are
expected. Significant river flooding is possible beginning Monday
and Tuesday in much of central Georgia and southern South Carolina
where average rainfall of 3 to 6 inches and isolated 10 inch amounts
are expected. Portions of these states within the southern
Appalachians will be especially vulnerable to flash flooding.
Farther north and west, Irma is expected to produce average amounts
of 2 to 4 inches in parts of Mississippi, Alabama, and Tennessee,
northern South Carolina and western North Carolina, where isolated
higher amounts and local flooding may occur.
FORECAST POSITIONS AND MAX WINDS
INIT 11/0900Z 28.9N 82.6W 65 KT 75 MPH...INLAND
12H 11/1800Z 30.8N 83.7W 55 KT 65 MPH...INLAND
24H 12/0600Z 33.0N 85.7W 35 KT 40 MPH...INLAND
36H 12/1800Z 34.5N 87.8W 25 KT 30 MPH...INLAND
48H 13/0600Z 35.5N 89.0W 20 KT 25 MPH...POST-TROP/INLAND
By Kevin Myers, CTSP
When it comes to cleaning up after a big storm, arborist crews generally must be ready for anything. Any given service territory comes with its own unique weather patterns and predictions, but dealing with the unexpected should always be a part of the game plan.
If your tree crews are working with utility companies, storm preparedness is especially important. Aside from worker and public safety, restoring power to customers is a top priority, and sending restoration workers – including arborists – to deal with fallen trees and large debris is part of that process. Outages cost utilities somewhere between $18 billion to $33 billion annually, according to the U.S. Department of Energy’s Office of Electricity Delivery and Energy Reliability, so getting systems back up and running as soon as possible is an essential part of a utility’s immediate response to weather-related outages.
With that in mind, a preparedness plan is critical. Safety and utility tree work have always gone hand in hand, but the stakes are that much higher when it comes to storm preparedness and recovery. So what does a good storm response and preparedness plan look like? And what kind of knowledge should arborists be equipped with when it comes to navigating severe weather in the field? Let’s take a look at some of the essentials of a storm preparedness program, as well as some of the types of extreme weather that field crews may have to deal with under extraordinary circumstances.
The Golden Rule of storm readiness
One of the most effective tips when responding to storm damage is a simple one, but it might not always be the first one you think of. It’s not training. It’s not technique. And it’s not having the right tools for the job. Those things are all critically important, of course, but the Golden Rule of storm readiness is this: Rest.
Think about it. When dealing with storm response and cleanup, hazards are far more plentiful than when performing other work under ordinary weather circumstances. The last thing any tree company wants is an exhausted crew out in the field, under-rested and over-stressed.
One common practice among Southern U.S. utility providers when dealing with the effects of hurricanes or tropical storms is to send responding crews home for a certain period of time before deploying them. The effect here is twofold: allowing workers to check in on their homes and families in the wake of a storm, and letting them get enough rest before going into the field so they can then focus on the work that must be completed. Some companies practice the “eight-hours-on, eight-hours-off” rule during protracted periods of storm restoration work, in order to ensure that all crews are rested throughout.
That particular method might not be feasible for every company under all circumstances. But it’s important nevertheless to remember that a well-rested tree crew is far more likely to work safe and stay safe when working under more dangerous, storm-related circumstances.
Safety by storm type
The most obvious cause of power outages and needed tree-cleanup work tends to be large thunder-and-lightning storms. But the truth is there are many more dangerous weather patterns occurring throughout the United States that all tree crews should be familiar with.It’s also true that when working in the wake of foul weather, more may be on the way – and tree crews must be prepared.
With that in mind, let’s look at some essential field safety tips if you happen to find yourself contending with Mother Nature unexpectedly.
Lightning strikes are one of the most dangerous aspects of a major thunderstorm and can occur up to 10 miles away from a storm itself. That means if you can hear thunder, there’s a lightning risk, regardless of whether skies appear clear and the sun is shining. This is one of the most important things to remember when working during a storm’s aftermath.
Warning signs include thunder claps, visible storm clouds and, of course, the telltale bright fl ashes of light in the sky. The most obvious way to stay safe if lightning abounds is to stay sheltered, but if you happen to find yourself in the field absent of any other form of shelter, returning to your vehicle is the safest bet.
During the winter months, thunderstorms turn to snowstorms and can lead to dangerous conditions in the field for tree crews.
Some overhanging branches that may not appear to pose a threat under ordinary circumstances may transform into hazards due to excess weight from heavy snowfall. Tree crews must take this excess weight into account when working around trees, which may also cause otherwise benign branches to fall onto power lines.
And while the snow itself won’t hurt you, blizzard conditions can pose serious hazards when driving your vehicle in the field. Ensure an emergency kit is always stocked in work vehicles, along with blankets, extra clothing, flashlights, tow ropes, booster cables and distress flares.
Tornadoes can appear faster than we might think. Their season is generally accepted as March through June, though tornadoes have been documented in all months. Know the warning signs: dark or green-colored skies; large, dark, low-lying clouds; and a persistently rotating cloud base.
Seeking underground shelter should be your first priority, but if you find yourself in a situation where this is impossible, seek low ground away from large objects or debris. This includes your vehicle, as well as other reasonably safe infrastructure. These objects can be obliterated by tornado-force winds, and the further your body is from them, the safer you are.
The biggest hazard in a hurricane isn’t necessarily the storm itself but the flying debris that these violent storms can kick up. While weather monitoring in states where hurricanes are frequent tends to be comprehensive – and no one is sending out tree crews as a hurricane approaches – it’s still worthwhile to be able to identify the signs and know the safety measures.
Indicators of a hurricane include increases in wind speed, heavy escalating rains and raised ocean levels. Finding indoor shelter is the best way to stay safe, ideally with power to the structure turned off. And while the weather may appear to calm during the middle of the storm, it can get far worse very quickly.
Additional weather hazards
Storms themselves aren’t the only natural hazard to watch out for in the field. Below are some additional things to stay prepared to encounter.
Flooding is, in fact, one of the extreme weather events with the most fatalities, and can result as an aftereffect of major storms or prolonged heavy rains. An average of 81 people die each year as a result of flooding, according to statistics compiled by the National Weather Service.
Why such a high rate? It’s easy to underestimate the threat of even light flooding. Consider that it takes just six inches of fl owing water to sweep someone off their feet. A flood fl owing at two feet deep can sweep away most vehicles.
When in the field, heavy rainfall is your first sign of a flood, but also keep an eye out for flowing water on normally dry land and rapidly rising water levels. If a flood is oncoming, avoid dips and valleys and get to higher ground as quickly as possible. Don’t attempt to cross fl owing streams. And perhaps most important, don’t attempt to drive through a flooded road, which can easily lead to a stalled vehicle and a dangerous situation for the driver.
It’s estimated that about half-a-million earthquakes occur around the world each year. While severity varies, Hazards abound when clearing storm-damaged trees. Overhanging branches that may not appear to pose a threat under ordinary circumstances may transform into hazards due to excess weight from heavy snowfalls. they can certainly pose a significant threat to outdoor crews. Earthquakes are not indicated by obvious visual signs such as dark clouds, but one tell tale sign is unusual changes in animal behavior. Wildlife can pick up on tremors and changes in electrical fields more so than humans.
If you find yourself caught in an earthquake, seek shelter under a stable object and grab onto something while the worst of the quake passes.
Take notice when driving along embankments, which are particularly susceptible to landslides. Road signs will often be posted, but it’s important for you to know what to look for, as well.
Take note of cracking tree sounds, boulders knocking together and other sounds that can indicate a rush of moving debris. Vacate the area immediately if you believe a landslide is oncoming. Flowing water changing from clear to muddy can be another indicator – landslides occur more commonly in river valleys and low-lying areas.
There is much more to comprehensive storm-preparedness planning – communicating cleanup plans to customers, equipment preparation, proactive vegetation management for utilities, monitoring and reporting and more – but one of the most important for everyday arborists is being able to identify some of the most threatening natural conditions that we face in the field.
Storms and hazardous conditions are simply part of the business for tree care workers. And it’s our responsibility to be able to work smart and work safe.
By: Barry Davis, Chubb
That beautiful old oak tree in front of your home was your pride and joy, until it fell on the roof of your house in a windstorm. Why did that happen? That mature tree had certainly weathered its share of windstorms in the past.
A roof is no match for a heavy tree or tree limb. The weight of a heavy falling tree is magnified by its momentum. The result can be extensive structural damage to your home and potential injury to your family. In addition, trees that penetrate a roof during storms can allow rain or snow to enter, causing further damage to the interior.
The fallen tree often reveals the cause of its weakness. Many homeowners are surprised to see the interior structure of the tree has been rotted away, has extensive insect damage or is otherwise diseased. However, many of these conditions can be identified in advance. A qualified Arborist can diagnose conditions and recommend a plan for treatment, pruning or removal of the tree before it lands like an anvil on your roof.
It is widely acknowledged that the vast majority of trees that fail during a windstorm or other type of event were already suffering from a pre-existing condition that weakened the trees, making them more susceptible to failure. According to Doug Cowles, President of Horticultural Asset Management, an International Society of Arboriculture (ISA) Certified Arborist can evaluate any or all of the trees on your property for conditions that may lead to a future failure. Doug recommends specifically having any large trees within striking distance of the main dwelling, other structures or parking areas inspected.
Trees can be a threat to your property, your safety and your lifestyle. But with increased awareness you can take action now to prevent these problems later.
Barry Davis is the Technology Development and Optimization Manager for Chubb’s Risk Consulting Group.