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Weather Guides/Models/Links
Topic Started: February 7 2011, 12:31 PM (1,565 Views)
Patrick (IWO)
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Raw Model Output:
From Wetterzentrale:

ECMWF (Determistic)
MSLP + 500hPa Geopotential:
24h 48h 72h 96h 120h 144h 168h 192h 216h 240h
MSLP + 850hPa Temperature:
24h 48h 72h 96h 120h 144h 168h 192h 216h 240h

ECMWF (Ensemble Mean)

MSLP + 500hPa Geopotential:
24h 48h 72h 96h 120h 144h 168h 192h 216h 240h
MSLP + 850hPa Temperature:
24h 48h 72h 96h 120h 144h 168h 192h 216h 240h

UKMO
MSLP + 500hPa Geopotential:
06h 12h 18h 24h 36h 48h 60h 72h 96h 120h
Fax Charts:
Analysis 24h 36h 48h 60h 72h 84h 96h 120h

GFS
Forecast Charts, including MSLP, Surface/850hPa Temperatures, Rainfall, Wind speed/direction & other parameters.
From Netweather.
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Jambo IWO
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Some sites of interest for radar images.

http://www.met.ie/latest/rainfall_radar.asp

http://www.raintoday.co.uk/

http://www.metoffice.gov.uk/weather/uk/radar/

http://www.weatheronline.co.uk/cgi-app/radar?LANG=en&CONT=ukuk

Latest satellite images sites

http://www.met.ie/sat/iuk-v.asp

http://www.sat24.com/?culture=en

http://www.metoffice.gov.uk/satpics/latest_IR.html

http://france.meteofrance.com/france/OBSERVATIONS?OBSERVATIONS_PORTLET.path=animationsatellite/ZONE_EUROPE





i eat weather forecaster's for breakfast....
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Fergal (IWO)
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METARs (METeorological Aviation Reports) and TAFs (Terminal Aerodrome Forecasts) can appear quite confusing at first glance, but after a little practice they can be decoded instantly and can be a useful tool for anybody who wants a quick idea of the present weather, and what it will do in the coming hours. They are primarily issued for aviation personnel (Pilots, Air Traffic Controllers, Airport Authorities, etc.) but can be used by anybody who knows how to decode them.

METARs
A METAR is a coded text report of the current weather conditions observed at an airport, and is issued every 30 minutes in Ireland. It gives information on wind (speed and direction), visibility, current weather, the coverage and heights of cloud layers, temperature, dewpoint, atmospheric pressure, plus in some cases, a trend forecast for the next two hours. Let’s take an example from Dublin Airport.

EIDW 072100Z 35008KT 8000 -RADZ SCT002 SCT006 BKN012 03/03 Q0989 NOSIG=Come back, don’t be afraid, it’s all very easy! Let’s break it down:

EIDW – This is the ICAO Code for Dublin Airport.

072100Z – The first 2 digits are the date (in this case the 7th), the other digits are the time of the report, in UTC/GMT (Z is a military code for UTC). This report was issued at 2100UTC (or 9pm GMT)

36008KT – This is the average wind measured over the previous 10 minutes. The first 3 digits represent the direction (in degrees true) from which the wind is blowing. Imagine a clockface, divided into 360 divisions (degrees true). North is 0° or 360°, East is 90°, South is 180°, West is 270°, etc. A direction of say 350° means wind blowing from just west of due North. The direction will always be reported by 3 digits, so a wind from say 30° (North-northeast) would be written as 030 (and read “zero three zero”). The next 2 digits are the speed, in knots (1 knot = 1.15 mph, or 1.85 kph). So in the METAR above we have an 8kt wind blowing from roughly north (350°, “three five zero degrees”). Sometimes you will see something like 27014G29KT. The G29 part represents the highest gust recorded in the last 10 minutes, so the wind in this case would be read “Wind two seven zero degrees, one four, gusting two niner, knots”. You may also see something like 310V060 following the wind group. This shows the variation in wind direction, so in this case it would read “varying between three one zero and zero six zero degrees”.

8000 – This is the minimum visibility observed/measured, in metres. For visibilities of 10 km or more, only the 4 digits 9999 will be used.

-RADZ – The current weather is light rain and drizzle. Other common descriptors are RA (RAin), DZ (DriZzle), SN (SNow), RASN (Sleet, i.e. Rain and Snow), GR (Hail), GS (Graupel), TSRA (ThunderStorm with RAin), FG, (FoG), BR (Mist), MIFG (Shallow FoG), FZFG (FreeZing FoG), HZ (HaZe). A – before it means “Light”, a + means “Heavy”, and no quantifier means “Moderate”. So +TSRA means “Thunderstorm with heavy rain”, RA means “Moderate Rain”, -SN means “Light Snow”, etc.

SCT006 BKN012 – These represent the coverage and heights of the cloud bases. SCT (Scattered) means 3-5 oktas (eighths) of the sky is covered, BKN (Broken) means 6-7 oktas. 006 and 012 are the cloud base heights, in hundreds of feet above ground level (not sea level), therefore the METAR reports Scattered clouds at 600ft and Broken clouds at 1,200ft above ground level (agl).

Other cloud descriptors are SKC (SKy Clear), FEW (1-2 oktas) and OVC (Overcast, 8 oktas). In good weather you may see CAVOK (Ceiling And Visibility OK) replacing the visibility and cloud groups, as it means that conditions are good for flying (no significant weather, visibility of 10km or more, no clouds below 5,000ft, no Cumulonimbus (Cb) or Towering Cumulus (TuCu) clouds (which would imply strong turbulence for an aircraft).

03/03 – The first 2 digits are the temperature, and the last two digits are the dewpoint, both in °C. Negative values are shown with an M in front, eg. M03/M06 (temperature -3°C, dewpoint -6°C).

Q0989 – This is the sea-level atmospheric pressure, in whole hectoPascals (or millibars). In this case it’s 989hPa.

NOSIG - This means “NO SIGnificant change is expected within the next two hours”. In some cases, where the weather is changing rapidly, this will be replaced by a trend forecast, in the same format explained in the TAF section next.

= - This signifies the end of the report.

______________________________________________________________________________________________


TAFs
A TAF is a coded text forecast of the weather conditions expected within a 5 nautical mile radius of the airport over the duration of the validity period indicated. As it is only a forecast for the local area, in some cases it may not be representative of the conditions further afield, due to local topography, lakes, etc. TAFs are issued every six hours, at 0500, 1100, 1700 and 2300Z, and are valid for 24 hours from the hour following the time of issue. In Ireland, TAFs are generated by meteorologists at Shannon Airport, and this human input ensures that they are as accurate as possible, but in some cases they may be amended to reflect changes different to those forecast.

Here is an example of a TAF issued for Cork Airport.

EICK 081100Z 0812/0912 25010KT 9999 SCT018
BECMG 0812/0814 26015KT
TEMPO 0813/0820 27017G28KT SCT017CB
PROB30 TEMPO 0815/0819 5000 -SHRA SCT010 SCT017CB BKN020
BECMG 0820/0823 28008KT
BECMG 0909/0912 23007KT=
The codes are similar to the METAR codes above.

EICK – The ICAO Code for Cork Airport.

081100Z – TAF issued at 1100GMT on the 8th.

0812/0912 - TAF is valid from 1200GMT on the 8th to 1200GMT on the 9th.

25010KT – Wind is expected to be from 250 degrees (Westerly) at 10 knots.

9999 – Visibility 10 km or more.

SCT018 - Scattered clouds at 1,800ft above ground level.

BECMG 0812/0814 – BECoMinG (ie. a permanent change is expected to occur) between 1200 GMT and 1400GMT on the 8th….

26015KT – Wind from 260 degrees at 15 knots

TEMPO 0812/0820 27017G28KT SCT017CB – Between 1200GMT and 2000GMT on the 8th, it will TEMPOrarily be Wind 27017G28KT and SCT017CB (Scattered Cumulonimbus clouds at 1,800ft). “Temporarily” means “for less than half of the time period specified”.

PROB30 TEMPO 0815/0819 5000 -SHRA SCT010 SCT017CB BKN020 – There is a 30% probability that temporarily between 1500GMT and 1900GMT on the 8th, visibility will reduce to 5000 metres in light rain showers, with scattered clouds at 1000ft, scattered Cumulonimbus at 1,700ft, and broken clouds at 2,000ft.

PROB30 means a slight chance. PROB40 means a medium chance. These are ways for the forecaster to show his/her confidence in this part of the forecast. PROB30 means there is a possibility that warrants a mention, but it probably won’t happen. PROB40 means it’s more likely to happen, but it’s still not certain. If they wrote BECMG, they would be fully confident that the change would occur.

BECMG 0820/0823 28008KT – Wind changing to 28008KT some time between 2000GMT and 2300GMT on the 8th

BECMG 0909/0912 23007KT= – Wind changing to 23007KT some time between 0900GMT and 1200GMT on the 9th. End of TAF.

This is a good site for viewing the latest METARs and TAFs in both coded and decoded format. Click on each airport. With a little practice, you will be able to read through each report without needing to consult the decoded text on the right.

This site gives the latest METARs and TAFs (undecoded) for Europe and North Africa, overlayed on the latest IR satellite picture.

Edited by Fergal (IWO), February 7 2011, 03:21 PM.
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Fergal (IWO)
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The SigWx charts are issued 4 times per day, and are a vital inclusion in a pilot's pre-flight preparation. They include a forecast of conditions between FL100 and FL450 (10,000 ft - 45,000 ft). At first glance they look confusing, but after a little practice you will gain a lot of information from them. Next time you're going on a flight, have a look at these charts and they'll give you an idea of the route and altitude you will take.

Firstly, you can access all the latest charts for Europe and the Atlantic, as well as wind charts for various Flight levels, from the Icelandic Met Office here.

In the example for 00Z on 8th February 2011 below I have outlined features which I will explain below.

Posted Image

We can see a number of Jetstream axes, marked by heavy dark arrows with wind barbs and pennants (solid triangles). A windbarb (line) represents 10 kts and a pennant is 50 kts. To calculate the speed, simply add up the barbs and pennants. We see a 100 kt jetstreak crossing Scotland from the northwest, at an altitude of Flight Level 330 (33,000 ft). There are two other streaks to the west of Ireland, one of 90 kts at FL290, and another of 100 kts at FL350. There is another strong jetstreak of 150 kts running northeastwards along northern France, Belgium and into the Baltic, before turning southeastwards into western Russia. It varies in strength, but over northern France its level of maximum winds is at FL340. However, you can see two other flight levels (240/430) marked with an E. These mark the limits of the 80 kt winds, so basically you would expect to winds of at least 80 kts between FL240-FL430. The hatched area around this jetstreak is a CAT (Clear Air Turbulence) Zone, marked as number 4. Looking at the legend we see that 4 contains Moderate, occasionally Severe turbulence between FL240 and FL420 (a __/\__ means "Moderate" turbulence, and one with a /\ over it means "Severe" turbulence. So let's say you flying from Dublin to Munich (marked with a M). You can expect a bumpy ride as you cross northern France!

Other features:

A: An area of Occasional Cb (Cumulonimbus, i.e. turbulence and possible lightning) with cloud tops at FL200 and cloud bases below FL100 (marked with the XXX)

B: Two areas (over Scotland and the North Sea) of moderate turbulence and severe airframe icing below FL110. (The U-shaped symbol is the icing symbol - one line means moderate icing, two lines means severe).

C: A tropospheric "sink" at FL350, i.e. a point where the troposphere is at its lowest (indicated by the downward arrow \/). A "dome" is where it's at its highest (marked by an upward arrow /\)

D: Isolated Embedded Cb with tops at FL300 and bases below FL100)



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Edited by Fergal (IWO), February 9 2011, 12:23 AM.
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Mark (IWO)
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CURRENT WEATHER

IRISH WEATHER STATION INFO
http://www.weatherlink.com/map.php
http://www.metoffice.gov.uk/weather/uk/observations/
http://www.met.ie/latest/reports.asp
http://www.trafficweather.info/roadW...jsp?client=208

Lightning Strikes
WORLD WEBCAMS
IRISH WEBCAMS
Road Conditions

SATELLITE/RADAR

RAIN RADAR
http://www.raintoday.co.uk/
http://www.metoffice.gov.uk/weather/uk/radar/
http://www.meteox.co.uk/h.aspx?r=&ja...soort=loop1uur
http://www.wunderground.com/wundermap/

LIVE SATELLITE (IRELAND AND UK)
http://www.sat24.com/gb

SATELLITE VIEW OF WESTERN EUROPE
http://oiswww.eumetsat.org/IPPS/html/latestImages/EUMETSAT_MSG_RGB-airmass-westernEurope.jpg
http://www.yr.no/satellitt/europa.html

Northern hemisphere satellite

WEATHER MODELS

GFS/UKMO/ECM CHARTS
Netweather
Weatheronline.co.uk
TWO
Meteociel
Wetter3
HIRLAM
Wetterzentrale

AO/NAO
GFS AO Bias
AO
NAO

WIND

WIND OBSERVATION MAP (UK AND IRELAND)
http://www.xcweather.co.uk/
http://magicseaweed.com/msw-surf-cha...wind&starttime

WIND MAP (ALL EURO COUNTRIES)
http://www.windguru.cz/int/index.php?sc=47736

TORNADO
Tornado Chase USA Live

AVIATION

LIVE FLIGHT INFO
http://www.radarvirtuel.com/

DUBLIN AIRPORT CONTROL TOWER
http://www.liveatc.net/search/?icao=dub


EARTHQUAKES

Earthquake Map

GLOBAL EARTHQUAKE REPORT
http://tsunami.geo.ed.ac.uk/local-bi...t/demo_run.pl#
http://www.emsc-csem.org/Earthquake/

IRISH AND UK EARTHQUAKES
Recent quakes
Irish Seismometers

SPACE
Satellite tracking


VOLCANO


Volcano webcams

OTHER

GLOBAL TEMP GRAPH
http://www.drroyspencer.com/latest-global-temperatures/

BBC MONTHLY OUTLOOK (UPDATED WEEKLY)
http://news.bbc.co.uk/weather/forecast/10209/

WEATHER HISTORY 1
WEATHER HISTORY 2
WEATHER HISTORY 3


Altitude Finder

Weathercharts.org


Threat Watch
The coldest winter you will ever experience is a summer in West Clare.
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