Tuesday 21 July 2015

Thunderstorm of hail and fire

So there was hail, and fire flashing continually in the midst of the hail, very severe, such as had not been in all the land of Egypt since it became a nation.…

Narrow zones where hail accumulates on the ground in association with thunderstorm activity are known as hail streaks or hail swaths, which can be detectable by satellite after the storms pass by. Around thunderstorms, hail is most likely within the cloud at elevations above 20,000 feet (6,100 m). Hail in the tropics occurs mainly at higher elevations.

Hail, Fire and Blood | Heaven Awaits

The hailstone will keep rising in the thunderstorm until its mass can no longer be supported by the updraft. Movement of dry air into strong thunderstorms over continents can increase the frequency of hail by promoting evaporational cooling which lowers the freezing level of thunderstorm clouds giving hail a larger volume to grow in. This may take at least 30 minutes based on the force of the updrafts in the hail-producing thunderstorm, whose top is usually greater than 10 km high. In the mid-latitudes, hail forms near the interiors of continents, while in the tropics, it tends to be confined to high elevations.

Storm brings 70kmh winds, hail and fire from lightning strike ...

Hail is most common within continental interiors of the mid-latitudes, as hail formation is considerably more likely when the freezing level is below the altitude of 11,000 feet (3,400 m). Below 10,000 feet (3,000 m), hail is equally distributed in and around a thunderstorm to a distance of 2 nautical miles (3.7 km).

A thunderstorm is a transient storm of lightning and thunder, usually with rain and gusty winds, sometimes with hail or snow, produced by cumulonimbus clouds. The storm heavily damaged Egyptian orchards and crops, as well as people and livestock. It will later begin to melt as it passes into air above freezing temperature.

During the Middle Ages, people in Europe used to ring church bells and fire cannons to try to prevent hail, and the subsequent damage to crops. A severe thunderstorm produces hail at least ¾-inch in diameter, wind 58 mph or higher, or tornadoes.

The Seventh Plague: Hail…22Now the LORD said to Moses, "Stretch out your hand toward the sky, that hail may fall on all the land of Egypt, on man and on beast and on every plant of the field, throughout the land of Egypt." 23Moses stretched out his staff toward the sky, and the LORD sent thunder and hail, and fire ran down to the earth. However, after the storm ceased, Pharaoh again "hardened his heart" and refused to keep his promise. Accordingly, hail is less common in the tropics despite a much higher frequency of thunderstorms than in the mid-latitudes because the atmosphere over the tropics tends to be warmer over a much greater altitude. And the LORD rained hail on the land of Egypt. The storm struck all of Egypt except for the Land of Goshen. God commanded Moses to stretch his staff skyward, at which point the storm commenced. Hailstorms normally last from a few minutes up to 15 minutes in duration. It was even more evidently supernatural than the previous plagues, a powerful shower of hail intermixed with fire. Hail suppression programs have been undertaken by 15 countries between 1965 and 2005.

The seventh plague of Egypt was a destructive thunderstorm. Hail growth becomes vanishingly small when air temperatures fall below −30 °C (−22 °F) as supercooled water droplets become rare at these temperatures. It then falls toward the ground while continuing to grow, based on the same processes, until it leaves the cloud. Pharaoh asked Moses to remove this plague and promised to allow the Israelites to worship God in the desert, saying "This time I have sinned; God is righteous, I and my people are wicked." As a show of God's mastery over the world, the hail stopped as soon as Moses began praying to God. Between 10,000 feet (3,000 m) and 20,000 feet (6,100 m), 60 percent of hail is still within the thunderstorm, though 40 percent now lies within the clear air under the anvil. Cloud seeding after World War II was done to eliminate the hail threat, particularly across the Soviet Union – where it was claimed a 70 to 98 percent reduction in crop damage from hail storms was achieved by deploying silver iodide in clouds using rockets and artillery shells. Hail formation requires environments of strong, upward motion of air with the parent thunderstorm (similar to tornadoes) and lowered heights of the freezing level. Accumulating hail storms can blanket the ground with over 2 inches (5.1 cm) of hail, cause thousands to lose power, and bring down many trees. Flash flooding and mudslides within areas of steep terrain can be a concern with accumulating hail.

Hail is possible within most thunderstorms as it is produced by cumulonimbi, and within 2 nautical miles (3.7 km) of the parent storm. Updated versions of this approach are available as modern hail cannons.

No comments:

Post a Comment