Published on August 2, 2007
WEATHER LORE CUMULONIMBUS AND HAIL
The mechanisms at work inside a cumulonimbus cloud are very special indeed. It is this cloud, towering up to 12 km or more in height, that brings our most impressive and potentially destructive weather.
Thunderstorms, intense rainfall, squalls, hailstorms and even tornadoes commonly accompany this ‘danger’ cloud, particularly with a so-called ‘Supercell’.
Less obviously devastating than a tornado, hailstorms do immense damage, particularly in continental interiors such as the USA. Here the intense heat of the ground surface in summer stimulates rapid and powerful uplift
The world record hailstone fell on the state of Kansas in the USA. It weighed 758 g, that’s 1.7 lbs, and was 7.5 inches in diameter!
Here in Britain our contender for the championship fell on Horsham in West Sussex in 1958 and weighed a mere 141 g!
What makes a hailstone? What are the special mechanisms? Well, first of all the structure of a cumulonimbus cloud has three distinct layers. At the very top where temperatures are as low as -30 or 40 degrees Celsius the cloud is composed of tiny ice crystals. Near the base of the cloud where the temperatures are probably above freezing minute water droplets are found.
Between these two layers is the important zone. Here ice crystals exist with ‘supercooled’ droplets. These are minute water droplets at a temperature below 0 degrees Celsius!
Inside the cumulonimbus cloud are powerful up and down currents, caused by the convective turning of air heated by the earths surface. A growing hailstone spends some time in the cloud being cycled between the different layers of the cloud, adding layers of clear ice as droplets freeze on to it, and white ice as ice crystals are attracted.
A true hailstone has several of these layers and the number of layers and therefore size of the hailstone depends on the time it has spent being rotated between the different parts of the cloud.
In April 1999 in Sydney hail caused one of Australia's costliest natural disasters. Hailstones the size of grapefruit damaged 200,000 homes and ruined 60,000 cars!
No deaths were recorded, only cuts and bruises, but in places the hailstones were 20 inches deep on the ground, that’s around half a metre!
Aktuelles Wetter für Hail . Die aktuelle Wettervorhersage für heute und die nächsten 15 Tage im 6-Stunden-Takt. Alle Wetterdaten für Hail.
10 day weather forecast for Hail. Weather summary and Hail forecast, including sun, rain, snow, wind and temperature. Hail sunrise and sunset times are ...
Das Wetter in Hail - Wettervorhersage für heute, morgen und die kommenden Tage mit Wetterbericht und Regenradar von wetteronline.de
Hail is a form of frozen precipitation that's created by strong thunderstorms with fast updrafts — air being pulled upward into a thunderstorm.
Das Wetter in Hail für heute, morgen und übermorgen von wetteronline.de
Weather Underground provides local & long range Weather Forecast, weather reports, maps & tropical weather conditions for locations worldwide.
Dieses Wetter erwartet Sie im Tagesverlauf. In Heil ist es tagsüber bewölkt, die Sonne zeigt sich nur vereinzelt bei Temperaturen von 15 bis 20°C.
Find the most current and reliable 7 day weather forecasts, storm alerts, reports and information for Hail, SA with The Weather Network.
Aktueller Wetterbericht für Hail. Bei Wetter.de finden Sie die Wettervorhersage für heute und die nächsten 15 Tage im 6-Stunden-Takt. Alle Wetterdaten ...
Wie wird das Wetter heute in Heilbronn? Temperatur-, Wind- und Regenvorhersage, sowie aktuelle Wetterwarnungen finden Sie auf wetter.com für 74072 ...