Boston, Massachusetts averages just under 2” of snow for the month of April. Given is proximity to the Atlantic Ocean and the warming effects of the water, big snowstorms in April are uncommon – but not rare. On April 17, 1821 such an uncommon event occurred as a strong storm system slowly lumbered up the eastern seaboard. Cold air held sway over New England, the storm swung northward but was far enough out to sea to prevent the warming effects of a flow of air off the ocean. The big counter-clockwise swirl of winds around the system blew from the north northeast and off the land enforcing cold air from eastern Canada rather than an east flow off the warmer ocean. The result was a foot of snow and the snowstorm prevent the Legislature from opening for several days. The storm also brought 3” of snow in New York City and 16” to Worcester, Massachusetts. Interestingly the 12” of snow in Boston is not the most snow there from a single storm in April, that record belongs to April 1, 1997 when more than 25” blanketed Beantown.

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On April 16th, 1851, a strong nor'easter smashed into Cape Cod, and brought the highest waters ever seen in that area up to that the time, easily besting the high tides of 1723. The system went into the history books as "The Lighthouse Storm.” Heavy gales and high seas pounded the coasts of New Hampshire and Massachusetts. The storm arrived at the time of a full moon, and the high tide was already well above what would be termed normal for the coast. That evening, the newly-constructed Minot's Ledge Lighthouse was destroyed by this massive storm. The storm weakened the tower's iron support piles, causing them to collapse and topple into the ocean off the coast. The lighthouse keeper, had been away in Boston when the storm struck. Onlookers on April 17 could only see the bent iron pilings where the lighthouse once stood. The two assistant lighthouse keepers, bravely kept the lighthouse lamp burning as late as 10:00 PM on the night of April 16th to warn ships of the nearby rocks just before they were swept away in the storm’s massive waves.

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The ship struck an iceberg at 11:40 p.m. Sunday, April 14. While the seas were relatively calm, that NW flow of air behind the front end actually steered a giant ice field towards the ship that night. The ship hit the iceberg that has been estimated as possibly weighing up to 300,000 tons, and the ship’s hull was torn open. It then took less than three hours from that point on for the Titanic to sink. The temperature of the water was estimated to be as low as 28 degrees – even lower than the conventional 32-degree freezing point as salt helped to lower its freezing point. Even though many people went into the water and survived the initial crash and sinking, the extremely cold-water temperature caused almost all in the water to suffer hypothermia and die quickly. Just hours before the wind has been west and the coldest water had not been pushed around the great ship. The water temperature may have been as high as 50 which would have allowed people to survive much longer in the water. At 2:20am on April 15, 1912 the Titanic slipped below the water. The unimaginable had happened, the unsinkable ship went to the deep. Faith in the promise of technology and science was shaken. 

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The National Weather Service reports that Hail is a form of precipitation consisting of solid ice that forms inside thunderstorm updrafts. Hail can damage aircraft, homes and cars, and can be deadly to livestock and people. Hailstones are formed when raindrops are carried upward by thunderstorm updrafts into extremely cold areas of the atmosphere and freeze. Hailstones then grow by colliding with liquid water drops that freeze onto the hailstone’s surface. Hail falls when it becomes heavy enough to overcome the strength of the thunderstorm updraft and is pulled toward the earth by gravity. Although Florida has the most thunderstorms, Nebraska, Colorado, and Wyoming usually have the most hailstorms. The area where these three states meet – “hail alley” – averages seven to nine hail days per year. Other parts of the world that have damaging hailstorms include China, Russia, India, Bangladesh and northern Italy. The largest hailstone recovered in the United States fell in Vivian, South Dakota, with a weight of 1 lb. 15 oz. But the world’s heaviest hailstone fell on April 14, 1986 in the Gopalganj district of Bangladesh. It likely fell to the ground at 90 mph and it weighed 2.25 lbs.

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The New York Times reports that chatting on the telephone connected to a land-line during a thunderstorm can electrocute you, it is no urban legend. A bolt of lightning that strikes a telephone line can cause an electrical surge to shoot through the wires and enter a handset. The odds of this are relatively small, and most phone companies have protective measures in place. Still, the risk exists, and the National Oceanic and Atmospheric Administration recommends that people avoid using telephones and other appliances during electrical storms. Cases of customers' being jolted while on the phone in a storm are well documented. In fact, on April 13, 1981 a person was killed while talking on the phone in Kincaid, IL when lightning struck an outside telephone line and traveled to the house via a phone line; the phone exploded. What about cell phones? Because the danger comes from lightning traveling through outdoor wiring, cordless and cellular phones are generally safe.

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The average annual snowfall in Philadelphia is slightly more than 22”. In April, Philly averages a half an inch of snow and there is measurable snow in April there only once every other year. 1841 was not so kind to Philadelphia. Unusual late season cold lingered for much of the month and a series of storms swept out of the Gulf of Mexico and up the East Coast of the United States bringing one snow event after the other. 6” of snow fell in the city on April 10th  and 3” fell on Aril 13 and 14th, but the heaviest snowfall occurred in between those two systems when a foot of the white stuff piled up on April 12, 1841. Almost 20” of snow fell on Philadelphia in April 1841 – the average for an entire winter season.

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On April 11, 1999 more than 3” of rain fell in Hong Kong during a cloudburst as heavy thunderstorms racked across the region. Streets were flooded and stores were forced to shut. The 3” of rain was more than Hong Kong had received in the first 3 months of 1999. As it turns out that is only half as much rain as is normal in Hong Kong from January to March when more than 6” is normal – still not a huge amount of rain. But rainfall is abundant, in Hong Kong when looked at through the lens of a full year. In fact, the normal yearly rainfall is around 94.5 inches per year. The rainiest period is from May to September, when the rainfall exceeds 12" per month in the city, while the least rainy period is from November to January, when it drops below 2 inches per month. To put that in perspective, Hong Kong’s 94.5” per year towers over places in the United States that are considered rainy like. Seattle, Washington with 38” average rainfall a year or 62” in Miami or 64” a year in New Orleans.

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The winter of 1995-1996 in the Northern part of the United State just didn’t seem to want to end. Cold air lingered on well past the start of Spring. April was cold in that region of the country, especially New England and the first half of the month seemed more like winter than Spring. At the start of the second week of April temperatures were below freezing most nights and even during the daytime, readings had a tough time reaching 40. Meanwhile a strong storm was organizing off the coast of South Carolina and started to make its way up the coast, but a bit offshore, but close enough to first push snow only the southern New Jersey coast dumping almost 5” of the white stuff on Atlantic City, an April record. The storm took a turn a bit to the northwest and pushed snow into New York City, JFK Airport had 4” on snow. But the heaviest snowfall was reserved for New England. By the time the snow stopped flying on the evening of April 10, 1996 Boston had 6”, Worcester, Ma 16” and Storrs, Conn 17”.

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Tornadoes have been recorded on all continents except Antarctica. The United States has the most tornadoes of any country, as well as the strongest and most violent tornadoes. A large portion of these tornadoes form in an area of the central United States. Canada experiences the second most tornadoes in the world. Other areas of the globe that have frequent tornadoes include significant portions of Europe, South Africa, Philippines, Bangladesh, parts of Argentina, Uruguay, and southern and southeast Brazil, along with northern Mexico, New Zealand, and far eastern Asia. Bangladesh and the eastern parts of India are very exposed to destructive tornadoes causing higher deaths and injuries. On April 9, 1993 several tornadoes ripped through the India in the State of West Bengal killing 100 people and injuring 400.

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In the early days of April 1938 arctic cold that had been building and bottled up in Alaska and the Yukon came crashing southward along the east slopes of the Rocky Mountains. The wintry chill reached cities like Cheyenne and Denver, Colorado Springs and Pueblo and then smashed eastward enveloping Omaha, Wichita and finally Amarillo. The cold modified as it headed eastward but held firm for several days from Montana to New Mexico and eastward into Nebraska, Kansas and the Oklahoma and Texas panhandles. Meanwhile off the coast of southern California a storm was brewing. That system headed eastward and spread a blanket of snow from Arizona and New Mexico into west Texas. The storm slowed and eventually stalled for several days in Texas. Moisture came streaming into the system from off the Gulf of Mexico and lifted up and over the cold air in place. The result was an all-out blizzard. It raged for 84 hours and when the storm finally moved eastward on the afternoon of April 8, 1938. Snow drifts reached 20 feet high. Winds at the height of the storm were clocked at 77 mph in Pampa, Texas and 8 deaths were blamed on the storm.

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