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  2. WHAT IS METEOROLOGICAL HAZARDS? • Meteorological hazardsareextremeweatherevents causedbychangesintheEarth'satmosphere.
  3. HAZARDS ASSOCIATED WITH METEOROLOGICAL PHENOMENA AFFECTING THE PHILIPPINES 1. TROPICALCYCLONES- Hazardsassociatedwith tropicalcyclonesare: • RAINS(intense,heavyrainfall)ofalltropicalcyclones,whichcancause flashfloods,floodsandlandslides.Theheavyrainofsometropicalstormsare notoriouslynotedformassiveflashfloods. • WINDS(high, strong, destructivewinds)ofsupertyphoons,typhoonsandsevere tropicalstorms. • STORMSURGES-sudden,rapid,riseof seawater atshallow coaststriggeredby thestrongwinds andlow pressurestyphoons.
  4. HAZARDS ASSOCIATED WITH METEOROLOGICAL PHENOMENA AFFECTING THE PHILIPPINES 2. MONSOONS- areseasonal, regionalweather system capableofproducing heavyrains resultinginflashfloods, flood, andlandslides. ThePhilippinesisinfluencedbythe: SOUTHWEST (SW) MONSOON- affect thewestern partof thePhilippines( lateMayto September). NORTHEST (NE)MONSOON- affects theeastern partofthe Philippines(late October to early March). MARITIMECONTENINTAL MONSOON- affect Central andSouthern Mindanao. Hazardsassociatedwiththemonsoonsare: • RAIN (intense, heavy rainfall) due to intensified monsoons caused by the presence of a nearb topicalcyclone. - a tropical cyclone/ typhoon north or northwest of Luzon would intensify the SW monsoon causin flash floods, floods or landslides in the western parts of the country, particularly, western Luzo includingMetro Manila.
  5. HAZARDS ASSOCIATED WITH METEOROLOGICAL PHENOMENA AFFECTING THE PHILIPPINES • INTERTROPICALCONVERGENCE ZONE(ITCZ) amigratorylarge-scaleweathersystem,thatislocated northofthePhilippinesduringthenorthernhemisphere(NH) summerandsouthofthePhilippinesduringsouthern hemisphere. HAZARDS ASSOCIATEDWITHITCZARE: • RAINS (intensive,heavyrainfall) • LOWPRESSURE AREAS (LPAs)
  6. HAZARDZ ASSOCIATED WITH OTHER METEOROLOGICAL PHENOMENA • Thunderstorms-heavyrainsthatmaycauseflashfloods,floods,lightningwhich maycausedeathduetoelectrocution.Lightingcouldalsostartawildfire. • Tornado/waterspout-characterizedbystrongwhirlingwindsoverland(tornado) andovertheseaorotherwatersurface.Thepathofdestruction isusuallya narrowzoneofmore orleeakilometerlongandwouldlastforonlyafew minutes. • MesoscaleConvectiveSystem(MCS)-consistofaclutterofheavythunderstorms cells,coveringanareaof50t0100 squarekilometersormore andcapableof producingheavytoveryheavyrainsforhours,resultingwidespreadflashfloods.
  7. CLIMATOLOGICAL HAZARDS • HazardsassociatedwithENSO(ElNinoSouthernOscillation) • ElNino, usuallycausesdroughtin thePhilippines,thatcouldeffectagriculture • HAZARDS ASSOCIATED WITH CLIMATE CHANGE • Extremeweather/climate events Heatwaves Strongertyphoons(strongerwinds,heavier rainfall,higherstorm surges) Moresevere andlongerdroughts(ElNino) • Accelerated sealevel rise,etc.
  8. CLIMATOLOGICAL HAZARDS • HazardsassociatedwithENSO(ElNinoSouthernOscillation) • ElNino,usuallycausesdroughtin thePhilippines,thatcouldeffectagriculture andfoodsupply,andfreshwaterdeficiency.(Theprimarycauseofanydroughtis belowaveragerainfall.Droughtisdifferentfromotherhazardsin thatis developsslowly,anditsonsetcanbemaskedbyanumberoffactors.Drought PERCURSORY SIGNS OF TROPICAL CYCLONES OCCURENCE CIRRUSCLOUDS The most common form of high- level clouds arethin andoftenwispycirrusclouds. A cirrus cloud shield or canopy ( very high, thin hooked clouds) is a part and appears ahead of a tropical cyclone (typhoon). It could be hundreds of kilometers away from an advancing storm. The convergence of these clouds points towards the direction where the stormislocated.
  9. PERCURSORY SIGNS OF TROPICAL CYCLONES OCCURENCE Dark, brick- red- orange coloration of the sky at the horizon during sunrise or sunset is consideredasasignthatsomewhere,ina not so distant region, a weather disturbance exist. Red Sky at night, traveler's delight; Red sky is morning, traveler's take warning. Only the reed light of the visible spectrum is now scattered away during sunrise or sunset.
  10. PERCURSORY SIGNS OF TROPICAL CYCLONES OCCURENCE When a halo or ring around the moon is observe thought the night “Ring around the moon means rain soon” according to some sayings . There’s truth to this saying because high cirrostratus clouds often come before a storm.
  11. •Regularincomingseaswells,increasinginheightand frequencyforbodethedistanttempest. Atropicalcyclonein theoceangeneratesbigwavesupto 35to40feet highare developinordinarystorms. •Unusualgradualrisingofsealeveloutsidethepredicted periodforhightide,withwindwavesformingwhitecapisa signoftheexistenceofaweatherdisturbancenearby, •Theskieswillgraduallydarken,andthewindswillcontinueto increaseinspeed,asatropical cycloneapproaches.
  12. • Fast- moving low clouds (scuds) beneath the dark overcast sky are observe within the 24- hour period before the full storm hits a locality, and gusts strengthening and occurringmorefrequently andrapidly. • Seasonality as a precursory sign of occurrence of hydrometeorological hazards. The occurrence of meteorological or hydrometeorological hazards in the Philippines is quitepredictable withrespect totheir seasonality. o Tropical cyclones are expected from May to December, with its peak season in July and August, although, tropical cyclones my occur any time of the year but leaser frequency. o The southwest monsoon starts late May or early June and ends in September and the northern monsoon starts in November and may last up to March of the succeeding year.
  13. oThe location of the ITCZ can be detected and monitored as it transits from thenorthernhemisphere to thesouthernhemisphere andback. oEnhanced rainfall with the possibility of flash floods, floods, and landslides over eastern Mindanao AND THE Visayas could be attributetothenortheastmonsoonandtheITCZoverthese region. oThe presence of the ITCZ and tropical cyclones during the southwest monsoon could increase the flood- causing rains over northernPhilippines.
  14. THE END REPORTER: Marie Vil G. Soterio SECTION: JADE