Tuesday, September 12, 2017

Historic Hurricanes Massachusetts

Hurricane Irma, east of Puerto Rico, Sept 5, 2017
If any remnants of Hurricane Irma reach eastern Massachusetts, all we are likely to see are rainy days. But there are historical records of much, much stronger storms having a direct, catastrophic impact locally.

1635: The Great Colonial Hurricane made landfall at Narragansett Bay in late August as a fast-moving Category 3 hurricane. It crossed directly over the Massachusetts Bay Colony. Historians consider this "… probably the most intense hurricane in New England history.”

1938: The practice of naming Atlantic hurricanes with women’s names did not begin until 1947; or retiring names of major storms after 1955, or having men’s names rather than only women’s starting in 1979. Thus, the storm of 1938 came be known as the Great New England Hurricane, also the Long Island Express. Mistakes in interpreting weather data had led to a prediction that this storm would dissipate to gale force before making landfall. Instead, on September 21, 1938, it reached Long Island with hurricane force winds and a significant storm surge. More than 600 people died – mostly in Rhode Island. The oldest residents of Maynard and Stow remember vast numbers of trees being blown down, blocking streets and damaging buildings.   

The 1938 hurricane downed trees and telephone poles on Maple Street,
Maynard, MA. (courtesy Maynard Historical Society)  
1954: A double-header! Hurricane Carol also crossed the east end of Long Island, reaching landfall as a Category 2 storm. In Boston, high winds destroyed the steeple of the Old North Church. Hurricane Edna crossed Cape Cod as a Category 2 storm just ten days after Carol had tracked a bit farther west. Locally, rainfall of 5 to 10 inches on ground already saturated by the passage of Carol flooded basements and rivers. Combined, the storms destroyed much of the peach and apple crops just weeks before harvest time. 

1955: Hurricane Diane waltzed ashore in the Carolinas, wandered across New Jersey and southern New York, before heading eastward across much of Massachusetts. By this time it was weak wind-wise, but very, very wet. Much of southern Massachusetts, from its border with New York to the ocean, experienced flooding. Half of Worcester was under water. Locally, an estimated 15 inches of rain fell in four days. The Assabet River crested at 8.93 feet, the highest it had been since 1927 and the highest since. (The flood of 2010 crested at 7.1 feet.) Main Street flooded, as did the first floor of the mill building closest to the river. No bridges were lost.   

1991: Hurricane Bob!!! This storm of August skirted the coast before making landfall at Newport, Rhode Island as a Category 2 hurricane. Forecasting was good, so Rhode Island and Connecticut were able to declare of emergency before the storm hit. The storm crossed eastern Massachusetts fast and relatively dry, so most of the damage was due to high winds and storm surge along the coast. Provincetown reported sustained winds exceeding 100 miles per hour. Locally, downed trees and minor damage to buildings. The name “Bob” was permanently retired, joining Diane, Edna and Carol as other New England hurricane names we will never hear anew.

An explanation of ‘storm surge’: coastal flooding can be severe during hurricanes (and also northeasters). Storms are centers of low air pressure, meaning less weight of air on the water, causing water level to rise underneath storms, which have low barometric pressure. Of much greater importance, the push of wind across long distances of water for prolonged periods of time not only generates large waves, but pushes water. When this reaches shore at times of high tide, the water can be five, ten, fifteen, even twenty feet above normal high tide. The Galveston, Texas hurricane of 1900 pushed a storm surge of 10 to 15 feet across a city that was mostly 10 feet above sea level, flattening the city and resulting in a loss of an estimated 10,000 lives, making it the deadliest natural disaster to every strike the United States. The Texas flooding from Hurricane Harvey was from rain, whereas the coastal flooding from Hurricane Irma was mostly storm surge (as when Hurricane Sandy hit New Jersey and New York).

One oddity - a storm tracking north along a west coast, much as Irma tracked north along the west side of Florida, will initially push water away from the shore, as wind direction on the north side of the storm is east to west. After the eye passes, the winds on the south side of the storm blow west to east, pushing all the water back.

All Irma delivered to eastern Massachusetts was scattered showers. Jose blessed Martha's Vineyard, Nantucket and the outer Cape with gale force winds and inches of rain, but much less west of Boston. Maria is too far away to guess what it will bring to New England.  

Wednesday, September 6, 2017

Consider the Muskrat

Caltech mascot is a beaver
MIT mascot is a beaver. Officially,
"Tim the Beaver"
Consider the muskrat. A muskrat can be thought of as a low-rent version of a beaver – they toil but do not build, their tails make no signature slap upon the waters when startled, trapped, their fur is worth less, and no college (and only one high school – Algonac, MI) ever selected the muskrat as its mascot; this versus the beaver mascots for MIT, Caltech, Babson College, Oregon State University, University of Maine at Farmington, and others. For more than 125 years there was a Beaver College, originally located in the town of Beaver, PA, but later relocated across the state to near Philadelphia; from 1907 to 1972 it was Beaver College for Women, then co-ed, meaning that it was also Beaver College for men, but finally undertaking a name change in 2001 to Arcadia University. (Past graduates were able to get replacement diplomas with the new name.)  

Muskrats (about three pounds) are rarely far from water. (Internet download)
Enough with run-on sentences. The muskrat is small. Adults weight about three pounds (compared to 30 or more for a beaver). The muskrat is short-lived. Average lifespan in the wild is 3-4 years. The muskrat is prolific. Females reach sexual maturity at one year, and can have 2-3 litters per year, 6-8 kits per litter. The muskrat is omnivorous. While the roots and stems of aquatic plants are a diet mainstay, muskrats will eat insects, crayfish and dead fish. In turn, the muskrat is food for many predators, falling prey to mink, coyote, fox and raccoons on land, owls descending from the air, lastly snapping turtles, otters and large fish in the water.   

Muskrat swimming.  When startled, they can
dive, and stay under water several minutes.
Muskrats are covered with short, thick fur brown or black in color, with the belly a bit lighter. The fur has two layers, which helps protect them from the cold water. The tail is hairless, rat-like in appearance, and used for swimming. The tail drags on the ground when walking on land, and so leaves a distinctive trail when walking on mud or snow.

Muskrats spend much of their time in the water, typically the shallow water of marshlands, streams and small ponds. Muskrats will reside at beaver ponds, and may even move into an abandoned beaver lodge. Otherwise, muskrats create modest-sized mounds of soft vegetation (not sticks or branches) near the shore, with a living chamber inside and an underwater entrance, or else burrow into river banks and live in these tunnels. The combination of less vegetation (eaten or for habitat) and shoreline burrowing contributes to erosion and flood risk.    

A muskrat "push-up", in this instance using stems from marsh plants,
provides some shelter from weather and predators, but is not nearly
as large or as sturdy as a beaver family's branches and mud abode.
Muskrats are indigenous to North America. Because many people in many countries thought it would be a good idea, muskrats are an invasive species across much of northern Europe, across much of Siberia, and also in parts of South America. The animals were imported either for fur farms, and then escaped, or were released to the wild with the idea that local trappers would have one more species to trap. The consequences are the same ecological impacts seen in North America – erosion and flood risk – made worse by the absence of mink, the primary predator. (Mink is also an invasive species in parts of Europe, but that is another story.)   

In Massachusetts, shooting muskrats is against the law, but a license can be obtained for trapping. The season opens on November 1st and closes at the end of February. Muskrat fur does not have the same cachet as mink, but there is some demand for muskrat pelts, especially from Korea and China. Prices at auction are about $3-4/pelt. Wild mink brings about $10-12/pelt. Farmed mink, a larger animal with a higher quality fur, brings $50-80/pelt. The official winter hat of the Royal Canadian Mounted Police is made with muskrat fur.