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Predicting weather
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Predicting weather



Yo!..this slide contains also prediction tips..

Yo!..this slide contains also prediction tips..



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Predicting weather Presentation Transcript

  • 1. WeatherThe state of the atmosphere at a place and time asregards heat, cloudiness, dryness, sunshine, wind, rain,etc.MeteorologistsAre experts who study the weather.
  • 2. What Is Weather? Weather simply refers to the condition of the air on earth ata given place and time - whether it is warm or cold, dry orwet, blowing or calm. The condition of air and how it actsto create weather is influenced primarily by two things -heat (the sun) and water.Weather on earth starts with the sun. The suns heat warmsour atmosphere and causes two things to happen: water evaporates into the air air risesAs air rises, its temperature drops. As the moisture inthe air cools, it condenses into tiny suspended droplets,forming clouds. The droplets inside the clouds becomelarger a more moisture is evaporated into theair. Eventually, they are too heavy to remain suspendedand fall to earth as precipitation - rain, snow, sleet or hail.
  • 3.  It informs farmers when is the best time toplant and harvest their crops Airplanes takeoffs, landings, and flight pathsare scheduled according to weather conditions. It alerts people to severe weather conditionsthat could endanger life and property, etc.
  • 4.  Is the science of predicting the weather using “models”of the atmosphere and computational techniques.TECHNIQUES Persistence Use of a barometer Looking at the sky Now casting Use of forecast models Analog
  • 5. 1.Look at the clouds.Clouds going in different directions (e.g. onelayer going west, another layer going north)means bad weather is coming.
  • 6. Cumulonimbus cloudsearly in the day anddeveloping throughout theday can mean greaterchances of severe weather.Mammatus cloud (formedby sinking air) can formwith both severe and non-severe thunderstorms aswell as other cloud typesMammatus cloud formationsCirrus clouds, high in thesky like long streamers,mean bad weather withinthe next 36 hours.Cirrus fibratus, aka "mares tail."
  • 7. Altocumulus clouds,which are like mackerel scales,also "mean" bad weather within thenext 36 hours. The old sailors sayingfor these types of clouds is "Mares tailsand mackerel scales, tall ships carryshort sails." Another is "Mackerel skiesand mares tails, sailors furl their sails."Mackerel skies and mares tailsformations sometimes appear in thesame sky. When that happens, rain issure to follow the next day.Altocumulus mackerel sky.Cumulus towersindicate the possibility ofshowers later in the day.Nimbostratus cloudshang low and heavy inthe sky, and mean rain isimminent.Nimbostratus clouds hang low.
  • 8.  3.Check the grass for dew at sunrise.If the grass is dry, this indicates cloudsor strong breezes, which canmean rain. If theres dew, it probablywont rain that day. 2. Look for a red sky.Remember the rhyme:"Red sky at night, sailors delight;Red sky at morning, sailors take warning.“Look for any sign of red in the sky (not a red sun);it will not be a bold orange orred the majority of the time, butthat depends a little on where you live
  • 9.  4. Look for a rainbow in the west.This is the result of the rising suns morning raysfrom the east striking moisture in the west. Mostmajor storm fronts in the Northern Hemispheretravel west to east, and a rainbow in the westmeans moisture, which can mean rain is on itsway. On the other hand, a rainbow in the eastaround sunset means that the rain is on its wayout and you can look forward to sunny days.Remember: Rainbow in the morning, need for awarning.
  • 10.  5. Detect the direction of the wind.Easterly winds, which blow from the east, can indicatean approaching storm front; westerly winds mean goodweather. Strong winds indicate high pressure differences,which can be a sign of advancing storm fronts. 6. Take a deep breath. Plants release their waste in a low pressure atmosphere, generatinga smell like compost and indicating an upcoming rain. Swamps will release gasses just before a storm because of thelower pressure, which leads to unpleasant smells.A proverb says "Flowers smell best just before a rain." Scentsare stronger in moist air, associated with rainy weather
  • 11.  7. Check for humidity.Many people can feel humidity, especially in their hair (it curls up and gets frizzy).You can also look at the leaves of oak or maple trees. These leaves tend to curl in highhumidity, which tends to precede a heavy rain. Pine cone scales remain closed if thehumidity is high, but open in dry air. Under humid conditions, wood swells. 8. Observe animals. They are more likely to react to changes in air pressure than we are. If birds are flying high in the sky, there will probably be fair weather. (Falling airpressure caused by an imminent storm causes discomfort in birds ears, so they flylow to alleviate it. Large numbers of birds roosting on power lines indicates swiftlyfalling air pressure.) Seagulls tend to stop flying and take refuge at the coast if a storm is coming. Animals,, especially birds get very quiet immediately before it rains. Cows will typically lie down before a thunderstorm. They also tend to stay closetogether if bad weathers on the way. Ants build their hills with very steep sides just before a rain. Cats tend to clean behind their ears before rain. Turtles often search for higher ground when a large amount of rain is expected. Youwill often see them in the road during this period (1 to 2 days before the rain). A very old wives tale says if birds feed in a storm it will rain for a long time, if theydont it will clear soon.
  • 12.  10. Make a campfire. The smoke should rise steadily.Smoke that swirls and descends is caused by lowpressure, meaning rain is on the way. 9.Look at the moon during the night. If it isreddish or pale, dust is in the air. But if the moonis bright and sharply focused, its probablybecause low pressure has cleared out the dust, andlow pressure means rain.Also, a ring around the moon (caused by lightshining through cirrostratus clouds associatedwith warm fronts and moisture) can indicate thatrain will probably fall within the next three days.Remember: Circle around the moon, rain or snowsoon.Ring around the moon
  • 13.  10. Create your own prediction methods.The methods provided thus far are basedaround a few key (but very general) principles:Low pressure brings rain, and majorweather systems move from west to east.Predicting the weather is all about recognizing thesigns of pressure change in your area.By being observant, forming hypotheses, and testingyour predictions, you can fine-tune your weatherpredicting abilities beyond what any article could everinstruct.