Wind Damage >> Storm Damage Roof Insurance Claim

Special hazards posed by derechos in urban areas Whether in an urban or rural area, those out-of-doors are at greatest risk of being killed or injured in a derecho. But of particular significance in urban areas is the vulnerability of electrical lines to high winds and Storm Damage Roof Insurance Claim falling trees. 

In addition to posing a direct hazard to anyone caught below the falling lines, derecho damage to overhead electric lines sometimes results in massive, long-lasting power outages. Hundreds of thousands of people may be affected; in the worst events, Storm Damage Roof Insurance Claim power may not be restored for many days. 

It is the complex and dense concentration of overhead distribution feeders in urban areas --- and Storm Damage Roof Insurance Claim their frequent proximity to large trees --- that make cities especially vulnerable to electrical outages following wind storms. The density and mileage of overhead electric distribution lines in urban areas far exceeds that of any rural or exurban area. 

Pole lines often carry multiple circuits and voltages, as well as lines for street lighting and customer service connections that further add to the vulnerability. Because of this, and because urban electrical feeders typically serve smaller territories relative to their rural counterparts, Storm Damage Roof Insurance Claim significantly greater manpower is necessary to restore service after major storms. 

In addition, unlike the localized damage produced by a tornado, derecho damage may be widespread. As a result, repairs often require greater effort, Storm Damage Roof Insurance Claim with additional delays related to shortages in supplies. Cities in which derechos have resulted in prolonged power outages include Baltimore (June 29, 1980), Kansas City (June 7, 1982), and Memphis (July 22, 2003). 

More recently, the Ohio Valley / Mid-Atlantic derecho of June 29, 2012 caused protracted, Storm Damage Roof Insurance Claim widespread power outages in cities from Cincinnati, Columbus, and Dayton to Atlantic City, Baltimore, and Washington, D.C. 

There also is evidence to suggest that the impact posed by derechos has increased in recent years due, in part, to the maturation of shade trees planted in suburban areas in the 1950s and 1960s. The vast tracks of post-war suburbs, with their overhead utility lines and Storm Damage Roof Insurance Claim older trees, are especially vulnerable to damage from high winds of any source. 

DERECHO-PRODUCING STORMS Derechos are associated with bands of showers or thunderstorms (collectively referred to as "convection") that assume a curved or Storm Damage Roof Insurance Claim bowed shape. The bow-shaped storms are called bow echoes. Bow echoes typically arise when a storm's rain-cooled outflow winds are strong, and move preferentially in one direction. 

A derecho may be associated with a single bow echo or with multiple bows. Bow echoes, in turn, may consist of an individual storm, or Storm Damage Roof Insurance Claim may be comprised of a series of adjacent storms (i.e., a squall line or, more formally, a quasi-linear convective system) that together take on a larger scale bow shape. 

Bow echoes may dissipate and Storm Damage Roof Insurance Claim subsequently redevelop during the course of given derecho. Derecho winds occasionally are enhanced when a rotating band of storms called a bookend vortex develops on the poleward side of the bow echo storm system. 

Derecho winds also may be augmented by the presence of embedded supercells (rotating thunderstorms) and other smaller-scale circulations in the derecho-producing convective system (see Tornadoes and Other Circulations). As noted previously, Storm Damage Roof Insurance Claim derecho winds are the product of what meteorologists call downbursts. 

A downburst is a concentrated area of strong wind produced by a convective downdraft. Downbursts have horizontal dimensions of about 4 to 6 miles (8 to 10 kilometers), and Storm Damage Roof Insurance Claim may last for several minutes. 

The convective downdrafts that comprise downbursts form when air is cooled by the evaporation, melting, and/or sublimation (the direct change to vapor phase) of precipitation in thunderstorms or Storm Damage Roof Insurance Claim other convective clouds. Because the chilled air is denser than its surroundings, it becomes negatively buoyant and accelerates down toward the ground. 

Derechos occur when meteorological conditions support the repeated production of downbursts within the same general area. The "downburst clusters" that arise in such situations Storm Damage Roof Insurance Claim may attain overall lengths of up to 50 or 60 miles (80 to 100 kilometers), and persist for several tens of minutes. 

Within individual downbursts there sometimes exist smaller pockets of intense winds called microbursts. Microbursts occur on scales (approximately 2 1/2 miles or 4 km) that are very hazardous to aircraft; Storm Damage Roof Insurance Claim several notable airline mishaps in recent decades resulted from unfortunate encounters with microbursts. 

Still smaller areas of extreme wind within microbursts are called burst swaths. Burst swaths range Storm Damage Roof Insurance Claim from about 50 to 150 yards (45 to 140 meters) in length. The damage they produce may resemble that caused by a tornado. 

A typical derecho consists of numerous downburst clusters ("families of downburst clusters") that are, in turn, comprised of many smaller downbursts, microbursts, and Storm Damage Roof Insurance Claim burst swaths. The schematic below illustrates the scalar relationships between these features. 

DERECHO DEVELOPMENT Derecho development necessarily is tied to the formation of bow echoes. A bow echo usually arises from a cluster of thunderstorms, Storm Damage Roof Insurance Claim but also may evolve from a single strong storm. Bow echoes most frequently occur when tropospheric winds are relatively strong and unidirectional (i.e., they vary little in direction with height). 

As the rain-cooled downdraft of a thunderstorm reaches the earth's surface, it spreads horizontally, most rapidly in the direction of the mean tropospheric flow. As the cool, dense air spreads outward, it forces the lighter, Storm Damage Roof Insurance Claim warm and moist air surrounding the storm up along the leading edge of the outflow, or gust front (see figure below, with mean flow assumed to be from left to right). 

The upward motion along the gust front typically is greatest along that part of the front that is moving most rapidly, Storm Damage Roof Insurance Claim that is, in the downwind direction (to the right in the figure). Gust fronts often are marked by a band of ominous, low clouds known as arcus. A photograph of an arcus (or shelf) cloud on the leading edge of a derecho appears at the top of this page. 

The development of a thunderstorm's downdraft ordinarily marks the Storm Damage Roof Insurance Claim dissipation stage of that particular storm. But air forced up along a gust front can give birth to new thunderstorms. As new storms mature, the rain they produce reinforces the existing "pool" of rain-cooled air produced by earlier storms, allowing the gust front to maintain its strength. 

As this cold pool increases in size and elongates in the direction of the mean wind, it may induce an inflow of air known as the rear-inflow jet (dashed brown arrow in figure below) on the trailing side of the thunderstorm complex. This causes the updraft to tilt toward the rear side of the storm (i.e., to the left in the figure). Tilting of the updraft allows the thunderstorm to further expand, Storm Damage Roof Insurance Claim increasing the aerial coverage of the rain. 

This, in turn, adds to the pool of cold air accumulating beneath the storm and strengthens the gust front, Storm Damage Roof Insurance Claim causing it to bow outward in the downwind direction. The resulting acceleration in forward motion of the gust front subsequently forces more warm, moist air upward, creating still more storms, and the process repeats.

Water Damage From Leaking Water Heater

Water heater leaks are usually quite obvious and you will discover substantial amounts of water on the floor around your heater. Normally, the first sign of a heater problem is water dripping from the bottom of the jacket. This indicates that the tank has corroded through. The cure may be installati  read more..

Flood Damage

Fire Damage Flood Damage and can be very tricky, no two cases are the same. One fire may have been started from grease catching on fire at the kitchen stove another fire may be from an electrical short from the water heater. One thing for sure both of these fires can leave a mess you cannot believe and possibly   read more..

How To Clean Up A Flooded Basement

Basement flooding caused by saturated ground can be corrected by installing a footing drain around the foundation (see illustration below). The drain collects groundwater and directs it to a sump. Basement Drying How To Clean Up A Flooded Basement When the sump fills, water is pumped out, usually onto the ground away from the building. Dep  read more..

Cleanup Trauma And Accident Cleanup

Workers exposure to blood borne pathogens can be considerably reduced through a good housekeeping plan which results in a clean and healthy workplace. The following Crime Scene Cleanup Cleanup Trauma And Accident Cleanup processes are taken from the Occupational Safety and Health Administration (OSHA) and the Centers for Disease Control and   read more..

Toxic Mold Decontamination Remediation

Concern about indoor exposure to mold has been increasing as the public becomes aware that exposure to mold can cause a variety of health effects and symptoms, including allergic reactions. This document presents guidelines for the remediation/cleanup of mold and moisture problems in schools and com  read more..

How To Disinfect Sewer Spillage

Sewer Backup and Stoppage Policy City personnel will check for and clear any debris creating a sewer blockage that are located in a main sewer line.City personnel will check any service lateral for blockages provided the property owner locates and Sewage Cleanup How To Disinfect Sewer Spillage provides access to a clean-out plug l  read more..

Can Lead Poisoning Be Treated ?

Can lead poisoning be treated? Yes, however, the best approach is to stop your children from coming into contact with lead. The most common way to treat lead poisoning in children is to find the lead source and remove it from their environment. Few children have high enough levels of lead in thei  read more..

Flood Protection Methods

Illinois can flood in any season. Floods have been caused by localized storms, rain over severaldays on saturated ground, snow melt, and ice jams. Over the last two decades, Flood Damage Flood Protection Methods a significant floodhas occurred somewhere in the state each year.

Many of them received a state or federa  read more..

How To Remove Structural Lead Paint

Return of the Employee to Former Job Status. (A) The employer shall return an employee to his or her former job status: 1. For an employee removed due to a blood lead-level at or above 80 µg/100 g when two consecutive blood sampling tests indicate that the employee's blood lead level is at Lead Paint Removal How To Remove Structural Lead Paint o  read more..

How To Stop Hoarding Possessions

Pharmacologically, there is little high-quality evidence for benefit of medications. Saxena recently published an open-label study showing positive effects using serotonin reuptake inhibitors (both selective serotonin reuptake inhibitors and serotonin norepinephrine reuptake inhibitors) in OCD and n  read more..