FORECASTS
| MET | SHIPPING | TROPICAL STORM & |
Barometric | Cloud | Fog
| Fronts
Humidity
Hurricanes
Hurricane | Precipitation
Shipping | Sun | Tornadoes
| Wind |
SHIPPING FORECAST AREAS. | |||||
---|---|---|---|---|---|
Viking | North Utsire | South Utsire | Forties | Cromarty | Forth |
Tyne | Dogger | Fisher | German Bight | Humber | Thames |
Dover | Wight | Portland | Plymouth | Biscay | Trafalgar |
FitzRoy | Sole | Lundy | Fastnet | Irish Sea | Shannon |
Rockall | Malin | Hebrides | Bailey | Fair Isle | Faeroes |
Southeast Iceland | |||||
2019/2020 | 2020/21 | 2021/22 | 2022/23 | ||||
---|---|---|---|---|---|---|---|
Atiyah | 08/12/19 | Alex | 02/10/20 (France) | Arwen | 26/11/21 | Antoni | |
Brendan | 11/01/19 | Barbara | 21/10/20 (Spain) | Barra | 07/12/21 | Betty | |
Aiden | 31/10/20 | Malik | 29/01/21 (Denmark) | ||||
Bella | 26/12/20 | ||||||
Ciara | 05/02/20 | Christoph | 19/01/21 | Corrie | 30/01/22 | Cillian | |
Dennis | 11/02/20 | Darcy | 06/02/21 | Dudley | 16/02/22 | Daisy | |
Jorge | 07/02/20 (Spain) | ||||||
Ellen | 18/08/20 | Evert | 30/07/21 | Eunice | 18/02/22 | Elliot | |
Francis | 24/08/20 | Fleur | Franklin | 20/02/22 | Fleur | ||
Gerda | Gavin | Gladys | Glen | ||||
Hugh | Heulwen | Herman | Hendrika | ||||
Iris | Iain | Imani | Íde | ||||
Jan | Julia | Jack | Johanna | ||||
Kitty | Klaas | Kim | Khalid | ||||
Liam | Lilah | Logan | Loes | ||||
Maura | Minne | Méabh | Mark | ||||
Noah | Naia | Nasim | Nelly | ||||
Olivia | Oscar | Olwen | Owain | ||||
Piet | Pheobe | Pól | Priya | ||||
Roisin | Ravi | Ruby | Ruadhán | ||||
Samir | Saidhbhín | Seán | Sam | ||||
Tara | Tobias | Tineke | Tobias | ||||
Vince | Veronica | Vergil | Val | ||||
Willow | Wilson | Willemien | Wouter | ||||
Cloud Types | Cloud Group | Atmospheric Layer | Cloud Base | ||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
noctilucent clouds (NLC's) | Polar Mesospheric Clouds (PMC's) | Mesosphere | Polar Stratospheric Clouds (PSC's) | Stratosphere | Cumulus clouds are puffy white or light grey and resmble floating cotton balls with sharp outlines and flat bases. | Clouds with Vertical Growth span all levels of the troposphere and may reach into the stratosphere. They develop due to warm air rising from the surface. | and Stratosphere Cumulus humilis clouds are associated with fair weather. | Cumulus congestus clouds have tops that resemble cauliflower heads are usually associated with light to heavy showers. | Cumulonimbus can grow up to 10km high, where high winds flatten the tops to give an anvil type appearance. It is these that are responsible for heavy rain, snow, hail, lightning, and tornadoes. | Cirrus clouds are composed entirely of ice. They are usually white and commonly referred to as "Mare's Tails" as they consist of long, thin, wispy streamers. They are a predictor of fair weather.
| The high clouds are all made of ice crystals due to the cold air in the upper sky. | and Stratosphere mid-latitudes: 5000-13000m polar region: 3000-8000m Cirrostratus are thin sheet like clouds that typically cover the entire sky. They are normaly responsible for the halo that can be observed around the sun or moon. When middle altitude clouds are seen with Cirrostratus it can be considsered as a predictor of precipitation. | Cirrocumulus clouds are small rounded, typically white, puffs that usually appear in long rows. They are seen in the winter and indicate fair, but cold weather. | Altostratus cloud are grey to bluish grey usually covering the whole sky. The Sun or Moon can shine through these but will appear out of focus. An altostratus cloud usually forms ahead of storms with continuous rain or snow. Occasionally, rain will fall from an altostratus cloud.
| Middle Clouds are a combination of ice crystals and water droplets.
| Troposphere | 8000m mid-latitudes: polar region: Altocumulus clouds usually form in greyish-white groups about 1 km thick. | Stratus are uniform grey in colour and almost cover the entire sky, usually looking like a fog that doesn't reach the ground. Light mist or drizzle is sometimes associated. | The low clouds consist of water droplets. | | | Stratocumulus clouds are low, lumpy, and greyand normally form in rows with blue sky visible in between. | Nimbostratus are dark grey with a ragged base and associated with continuous light rain or snow.
| |
Types of Precipitation | |||
---|---|---|---|
Dry | Virga | evaporates before reaching the ground | |
Liquid | Drizzle | liquid water drops smaller than 0.5 mm (0.02 in.) in diameter | |
Rain | |||
Very light | < 0.25 mm/hour | ||
Light | > 0.25 < 1.0 mm/hour | ||
Moderate | > 1.0 < 4.0 mm/hour | ||
Heavy | > 4.0 r < 16.0 mm/hour | ||
Very heavy | > 16.0 < 50 mm/hour | ||
Extreme | > 50.0 mm/hour | ||
Freezing | Freezing drizzle | freezes on contact with the ground or an object at or near the surface. | |
Freezing rain | supercooled droplets that will freeze upon impact with any object it encounters | ||
Frozen | Graupel / Snow pellets | supercooled droplets of water condense on a snowflake to form a 2–5 mm ball of ice | |
Hail | balls or irregular lumps of ice mostly of water ice and measuring between 5 and 50 millimeters in diameter | ||
Ice crystals | (Diamond dust) a ground-level cloud composed of tiny ice crystals | ||
Ice pellets | (sleet) small, translucent ice balls | ||
Snow | crystalline water ice, consisting of a multitude of snowflakes | ||
Snow grains | very small amounts of >1 mm, white, opaque grains of flat or enlongated ice |
For instance, at 20o C, one litre of air can hold 17mg of water so if there is 1.7 mg of water in the air then there is a relative humidity of 10%.
The graph below shows the amount of water that can be held in the air for a range of temperatures.
The table below shows the apparent temperatures due to humidity levels.
0 | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45
| 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100
| Actual | temp 43o C | 37 | 39
| 41 | 42
| 44 | 47
| 51 | 54
| 58 | 62
| 66 | 41o C | 35 | 36
| 38 | 39
| 41 | 43
| 45 | 48
| 51 | 54
| 57 | 61
| 65 | 38o C | 33 | 34
| 35 | 36
| 37 | 38
| 40 | 42
| 43 | 46
| 49 | 52
| 56 | 59
| 62 | 35o C | 31 | 31 | 32
| 33 | 34
| 34 | 36
| 37 | 38
| 40 | 42
| 43 | 46
| 48 | 51
| 54 | 58
| 32o C | 28 | 29 | 29 | 30 | 31 | 31 |
32 | 33
| 34 | 35 | 36
| 37 | 38 | 39 | 41 | 43 | 45 | 47 | 50 |
| 29o C | 26 | 26 | 27 | 27 | 28 | 28 | 29 | 29 | 30 | 31 | 31
| 32 | 32 | 33 | 34 | 35 | 36 | 37 | 39 | 41 | 42
| 27o C
| 23 | 23 | 24 | 24 | 25 | 25 | 26 | 26 | 26
| 27 | 27
| 27 | 28
| 28 | 29
| 30 | 30
| 31 | 31
| 32 | 33
| 24o C | 21 | 21 | 21 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 24
| 24 | 24 | 24 | 25 | 25 | 26 | 26 | 26 | 26 |
27
| 21o C | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 20 | 20
| 21 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22
| |
You should not worry about exposure to sunlight.
MEDIUM While the Sun is not particularly dangerous you should avoid prolonged exposure to direct Sunlight.
HIGH
It is advisable to stay out of direct sunlight as burning may occur between 30 minutes and an hour. Keep covered up and use at least SPF 15.
VERY HIGH
Less than half an hour can result in severe burning in direct sunlight.
In 1805 Francis Beaufort devised a scale that he first mentioned in his private log on 13th January 1806 whilst he was serving on board HMS Woolwich. He stated in the log that he would "hereafter estimate the force of the wind according to the following scale"
SUN INDEX
The SUN INDEX that they talk about on weather forecasts is basically a guide to the potential danger of exposure to direct sunlight.
SUN INDEX PALE SKIN
EASILY BURNT PALE SKIN
NOT EASILY BURNT BROWN SKIN BLACK SKIN
1 LOW LOW LOW LOW
2 LOW LOW LOW LOW
3 MEDIUM LOW LOW LOW
4 MEDIUM LOW LOW LOW
5 HIGH MEDIUM LOW LOW
6 HIGH MEDIUM MEDIUM LOW
7 VERY HIGH HIGH MEDIUM MEDIUM
8 VERY HIGH HIGH MEDIUM MEDIUM
9 VERY HIGH HIGH MEDIUM MEDIUM
10 VERY HIGH HIGH HIGH MEDIUM
LOW
WIND SPEEDS
Beaufort Scale.
The most commonly used scale for windspeed today is the "Beaufort Scale"although others, including Defoe’s Table of Degrees and a quantitative wind scale devised by a Mr Rous at the beginning of the 19th century have also been included here.
Category | Description0 | Calm | 1 | Faint air just not calm | 2 | Light airs | 3 | Light breeze | 4 | Gentle breeze | 5 | Moderate breeze | 6 | Fresh breeze | 7 | Gentle steady gale | 8 | Moderate gale | 9 | Brisk gale | 10 | Fresh gale | 11 | Hard gale | 12 | Hard gale with heavy gusts | 13 | Storm | |
THE Lords Commissioners of the Admiralty having had under consideration the general utility of recording with clearness and precision, in the Log Books of all Her Majesty's Ships and Vessels of War, the actual State of the Winds and Weather, have thought fit to order that henceforward in each page of the Log Book two columns should be introduced, wherein the force of the Wind and the appearance of the Atmosphere shall be every hour registered according to the annexed scheme, a copy of which shall be pasted into each book and painted on the back of every Log Board or Log Slate and two more columns shall likewise be given for the purpose of entering the heights of the Barometer or Sympiesometer, and Thermometer, when such instruments may be on board. | |
Beaufort Number | General Description | 0 | Calm
| 1 | Light Air
| 2 | Light Breeze | 1 to 2 knots
| 3 | Gentle Breeze | 3 to 4 knots
| 4 | Moderate Breeze | 5 to 6 knots
| 5 | Fresh Breeze | 6 | Strong Breeze | single-reefs and top-gallant sails
| 7 | Moderate Gale | double-reefs, jib, etc
| 8 | Fresh Gale | triple-reefs, courses, etc
| 9 | Strong Gale | close-reefs and courses
| 10 | Whole Gale | 11 | Storm | 12 | Hurricane | |
Beaufort number | description of wind
| - | mean | limits | mean | limits | mean | limits | -
| 0 | 0 | >1 | 0 | > 1 | 0.0 | 0.0 - 0.2 | calm
| 1 | 2 | 1 - 3 | 2 | 1 - 3 | 0.8 | 0.3 - 1.5 | light air
| 2 | 5 | 4 - 6 | 5 | 4 - 7 | 2.4 | 1.6 - 3.3 | light breeze
| 3 | 9 | 7 - 10 | 10 | 8 - 12 | 4.3 | 3.4 - 5.4 | gentle breeze
| 4 | 13 | 11 - 16 | 15 | 13 - 18 | 6.7 | 5.5 - 7.9 | moderate breeze
| 5 | 19 | 17 - 21 | 21 | 19 - 24 | 9.3 | 8.0 - 10.7 | fresh breeze
| 6 | 24 | 22 - 27 | 28 | 25 - 31 | 12.3 | 10.8 - 13.9 | strong breeze
| 7 | 30 | 28 - 33 | 35 | 32 - 38 | 15.5 | 13.9 - 17.1 | near gale
| 8 | 37 | 34 - 40 | 42 | 39 - 46 | 18.9 | 17.2 - 20.7 | gale
| 9 | 44 | 41 - 47 | 50 | 47 - 54 | 22.6 | 20.8 - 24.4 | strong gale
| 10 | 52 | 48 - 55 | 59 | 55 - 63 | 26.4 | 24.5 - 28.4 | storm
| 11 | 60 | 56 - 63 | 68 | 64 - 72 | 30.5 | 28.5 - 32.6 | violent storm
| 12 | --- | > 64 | --- | >73 | --- | >32.7 | hurricane
| |
0 | Land | Calm; smoke rises vertically. |
Sea | Sea like a mirror. | |
1 | Land | Direction of wind shown by smoke drift but not by wind vanes. |
Sea | Ripples with the appearance of scales are formed but without foam crests. | |
2 | Land | Wind felt on face; leaves rustle; ordinary vanes moved by wind. . |
Sea | Small wavelets, still short but more pronounced; crests have a glassy appearance and do not break. | |
3 | Land | Leaves and small flags in constant motion; winds extend light flags. |
Sea | Large wavelets; crests begin to break; foam of glassy appearance; perhaps scattered white horses. | |
4 | Land | Dust and loose paper raised; small branches are moved. |
Sea | Small waves, becoming longer, fairly frequent white horses. | |
5 | Land | Small trees in leaf begin to sway; crested wavelets form on inland waters. |
Sea | Moderate waves, taking a more pronounced long form; many white horses are formed; chance of some spray. . | |
6 | Land | Large branches in motion, umbrellas used with difficulty. |
Sea | Large waves begin to form; the white foam crests are more extensive everywhere; probably some spray. | |
7 | Land | Whole trees in motion; inconvenience felt when walking against the wind. |
Sea | Sea heaps up and white foam from breaking waves begins to be blown in streaks along the direction of the wind. | |
8 | Land | Twigs broken off trees; progress generally impeded. |
Sea | Moderately high waves of greater length, edges of crests begin to break into spindrift; the foam is blown in well marked streaks along the direction of the wind. | |
9 | Land | Slight structural damage occurs (chimney pots and slates removed). |
Sea | High waves, dense streaks of foam along the direction of the wind; crests of waves begin to topple, tumble and roll over, spray may affect visibility. | |
10 | Land | Seldom experienced inland; trees uprooted; considerable structural damage occurs. |
Sea | Very high waves with long overhanging crests, the resulting foam in great patches, is blown in dense white streaks along the direction of the wind; on the whole, the surface of the sea takes on a white appearance; the tumbling of the sea becomes heavy and shock-like; visibility affected. | |
11 | Land | Very rarely experienced; accompanied by widespread damage. . |
Sea | Exceptionally high waves (small and medium sized ships may be lost to view behind the waves for varying periods of time); the sea is completely covered with long white patches of foam lying along the direction of the wind; everywhere the edges of the wave crests are blown into froth; visibility is affected. | |
12 | Land | ---- |
Sea | The air is filled with foam and spray; sea completely white with driving spray, visibility very seriously affected. | |
Miles in one hour | Feet in one second | Almost calm | 1 | 1.47 | 0.005 | Just perceptible | 2 | 3 2.93 | 4.40 0.020 | 0.044 Gentle breeze | 4 | 5 5.87 | 7.33 0.079 | 0.123 Fresh breeze | 10 | 15 14.64
| 22.00 0.492
| 1.107 Fresh gale | 20 | 25 29.34
| 36.67 1.968
| 3.075 Strong gale | 30 | 35 44.01
| 51.34 4.429
| 6.027 Hard gale | 40 | 45 56.68
| 66.01 7.873
| 9.963 Storm | 50 | 75.35 | 12.300 | Violent hurricanes, tempests, etc. | 60 | 80 100 88.02
| 117.36 146.70 17.715
| 31.490 49.200 |
HURRICANES
Lists of the worlds Hurricane Names can be found at the bottom of the page.
Category 1 | |||||
---|---|---|---|---|---|
Central Pressure | mbar | 980 | Storm Surge | feet | 4–5 |
in Hg | 28.94 | metres | 1.2–1.5 | ||
Sustained winds | mph | 74–95 | km/h | 119–153 | |
knots | 64–82 | m/s | 33–42 | ||
* No significant damage to building structures. * May tip over unanchored mobile homes, as well as uproot or snap trees. * Poorly attached roof shingles or tiles can blow off. * Some coastal flooding and possible minor pier damage. | |||||
Category 2 | |||||
Central Pressure | mbar | 965 – 979 | Storm Surge | feet | 6–8 |
in Hg | 28.50–28.91 | metres | 1.8–2.4 | ||
Sustained winds | mph | 96–110 | km/h | 154–177 | |
knots | 83–95 | m/s | 43–49 | ||
* Damage to some roofing material, and to poorly constructed doors and windows. * Considerable damage to vegetation, poorly constructed signs, and piers. * Mobile homes usually badly damaged, many manufactured homes suffer structural damage. * Small craft in unprotected anchorages may break their moorings | |||||
Category 3 | |||||
Central Pressure | mbar | 945 – 964 | Storm Surge | feet | 9–12 |
in Hg | 27.91–28.47 | metres | 2.7–3.7 | ||
Sustained winds | mph | 111–130 | km/h | 178–209 | |
knots | 96–113 | m/s | 50–58 | ||
* Some structural damage to small residences and utility buildings. * Buildings that lack a solid foundation usually destroyed, and gable-end roofs are peeled off. * Manufactured homes sustain very heavy and irreparable damage. * Flooding near the coast destroys smaller structures. | |||||
Category 4 | |||||
Central Pressure | mbar | 921 – 944 | Storm Surge | feet | 13–18 |
in Hg | 27.17–27.88 | metres | 4.0–5.5 | ||
Sustained winds | mph | 131–155 | km/h | 210–249 | |
knots | 114–135 | m/s | 59–69 | ||
* Extensive curtainwall failures, with some complete roof structural failure on small residences. * Heavy, irreparable damage and near complete destruction of gas station canopies and other wide span overhang type structures are also common. * Mobile and manufactured homes are leveled. * Major erosion of beach areas and inland flooding. * Extremely danger to populated areas. | |||||
Category 5 | |||||
Central Pressure | mbar | < 920 | Storm Surge | feet | > 19 |
in Hg | < 27.17 | metres | > 5.5 | ||
Sustained winds | mph | > 156 | km/h | > 250 | |
knots | > 136 | m/s | > 70 | ||
* Complete roof failure on many residences and industrial buildings. * Some complete building failures with small utility buildings blown over or away. * Collapse of many wide-span roofs and walls. * Very heavy and irreparable damage to many wood frame structures. * Total destruction to many mobile/manufactured homes. * Only a few types of structures are capable of surviving intact. * Flooding causes major damage to the lower floors of all structures near the shoreline, and many coastal structures can be completely flattened or washed away by the storm surge. * Storm surge damage can occur up to four city blocks inland, with flooding, depending on terrain, reaching six to seven blocks inland. |
The scale was developed in 1971 by Tetsuya "Ted" Fujita (University of Chicago) and Allen Pearson (head of the National Severe Storms Forecast Center).
TORNANDOES
Fujita Scale
(Fujita-Pearson Scale) is used to rate tornado intensity.
It is based on the damage that the tornado inflicts.
F-Scale Number | Intensity Phrase | Wind Speed | Type of Damage Done |
F0 | Gale tornado | 40-72 mph | Some damage to chimneys; breaks branches off trees; pushes over shallow-rooted trees; damages sign boards. |
F1 | Moderate tornado | 73-112 mph | The lower limit is the beginning of hurricane wind speed; peels surface off roofs; mobile homes pushed off foundations or overturned; moving autos pushed off the roads; attached garages may be destroyed. |
F2 | Significant tornado | 113-157 mph | Considerable damage. Roofs torn off frame houses; mobile homes demolished; boxcars pushed over; large trees snapped or uprooted; light object missiles generated. |
F3 | Severe tornado | 158-206 mph | Roof and some walls torn off well constructed houses; trains overturned; most trees in fores uprooted |
F4 | Devastating tornado | 207-260 mph | Well-constructed houses leveled; structures with weak foundations blown off some distance; cars thrown and large missiles generated. |
F5 | Incredible tornado | 261-318 mph | Strong frame houses lifted off foundations and carried considerable distances to disintegrate; automobile sized missiles fly through the air in excess of 100 meters; trees debarked; steel re-inforced concrete structures badly damaged. |
F6 | Inconceivable tornado | 319-379 mph | These winds are very unlikely. The small area of damage they might produce would probably not be recognizable along with the mess produced by F4 and F5 wind that would surround the F6 winds. Missiles, such as cars and refrigerators would do serious secondary damage that could not be directly identified as F6 damage. If this level is ever achieved, evidence for it might only be found in some manner of ground swirl pattern, for it may never be identifiable through engineering studies |
You can use it to find out what the local weather is doing almost anywhere in the world.
The names are used sequentially so that as the bottom of one list is reached, the next name is the top of the next list.
These names are also used sequentially.
Each region uses these lists sequentially so, for instance, if the last storm of the year is Richard, the first storm of the next year is Sadie.
The lists are used sequentially one after the other. The first name in any given year is the one immediately following the last name from the previous year. List E is a list of replacement names if they become necessary.
These lists are used sequentially.