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