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[http://www.torro.org.uk/hsintens.html]
| Intensity |
Size Code |
Description |
| H0 |
1
|
True hail of pea size but no damage
|
| H1 |
1-3
|
Leaves holed; flower petals cut
|
| H2 |
1-4
|
Leaves stripped from trees and plants; vegetables, fruit and crops
bruised and scarred; vegetable leaves shredded
|
| H3 |
2-5
|
A few panes in glasshouses, cloches and/or skylights broken; wood fences
scored; paint scraped off window ledges; caravan body work dented; perspex
roofing holed; canvas [e.g. tents] torn; stems of crops severed and
seeds threshed; fruit sliced/split.
|
| H4 |
3-6
|
Some house windows and/or vehicle windscreens broken/cracked; glasshouses
extensively damaged; some felt roofs pierced; paint scraped off walls
and vehicles; some thin car bodywork visibly dented; small branches
broken from trees; unprotected birds and poultry killed; firm ground
pitted.
|
| H5 |
4-7
|
Some roof slates and potter-type tiles broken; many windows smashed;
plate-glass roofs and reinforced glass windows broken; bodywork of most
exposed cars visibly pitted; bodywork of light aircraft pitted; risk
of serious or fatal injuries to small animals; strips of bark torn from
trees; woodwork pitted and splintered; large branches cut from trees.
|
| H6 |
5-8
|
Many roof slates and tiles [except concrete tiles] broken; shingle
and thatch roofs breached; corrugated iron and some sheet metal roofs
scored and a few holed; brick walls slightly pitted; wooden window frames
broken away.
|
| H7 |
6-9
|
Slated, shingle and many tiled roofs shattered, exposing rafters; metal
roofing punctured; brick and stone walls pitted; metal window frames
broken away; bodywork of cars and light aircraft seriously/irreparably
damaged
|
| H8 |
7-10
|
Concrete roof tiles cracked; sheet metal, slate, shingle, and other
tiled roofs destroyed. Pavements pitted; bodywork of commercial aircraft
seriously damaged; small tree trunks split apart; risk of serious injury
to people caught in the open.
|
| H9 |
8-10
|
Concrete walls pitted; concrete roof tiles widely broken; walls of
wooden houses completely holed; large tree trunks cut down; risk of
fatal injury to persons caught in the open.
|
| H10 |
9-10
|
Wooden houses destroyed; brick-built houses very severely damaged;
risk of fatal injury to unprotected persons.
|
Size
Code |
Diameter
mm |
Description |
Intensity
Range |
1 |
5 – 10 |
Pea |
H0 – H2 |
2 |
11 – 15 |
Mothball, bean, hazelnut |
H0 – H3 |
3 |
16 - 20 |
Marble, cherry, small grape |
H1 – H4 |
4 |
21 - 30 |
Large marble, large grape, walnut |
H2 – H5 |
5 |
31 - 45 |
Chestnut, pigeon’s egg, golf ball [41 mm],
table tennis ball [38 mm], squash ball |
H3 – H6 |
6 |
46 - 60 |
Hen’s egg, small peach, small apple, billiard
ball |
H4 – H7 |
7 |
61 - 80 |
Large peach, large apple, goose egg, small/medium
orange, tennis ball [68 mm], cricket ball [73 mm], baseball. |
H5 – H8 |
8 |
81 - 100 |
Large orange, grapefruit, softball |
H6 – H9 |
9 |
101 - 125 |
Melon |
H7 – H10 |
10 |
>125 |
Coconut etc |
H8 – H10 |
Introduced in 1986 in order to categorise damaging
and potentially damaging hailstorms. The intensity of a hailfall is assigned
according to the maximum damage observed, while the intensity of the overall
storm is recorded according to the highest hailfall intensity. Where damage
does not occur, intensity is rated according to hailstone size. Emphasis is
placed on the likelihood that hail of a given size is likely to produce damage
in a given range. This range is designed to accommodate the majority of windspeeds
within which hail falls.
References
http://www.torro.org.uk/hsintens.htm
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