climate of ilocos norte
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CYNTHIA O. IGLESIALAOAG PAGASA STATION
Climate InformationRefers to average weather (rainfall,
temperatures, winds, relative humidity, cloudiness, etc) of the place over a period which long enough to establish its statistical properties such as mean values, variances, probabilities and extreme events.
Climate Type in the PhilippinesClimate Type in the Philippines
Rainfall is the Rainfall is the single weather single weather element used to element used to determine the type determine the type of climate;of climate;
Four types of Four types of ClimateClimate
Type I Two pronounced seasons, dry from November to
April and wet during the rest of the year. Maximum rain period is from June to September during the prevalence of the southwest monsoon. The dry season lasts from three to six or seven months. This type of climate is found in the Ilocos Region, western part of Mt. Province, west of Nueva Ecija, Central Luzon, Metro Manila, Cavite, Laguna, Batangas, Tarlac, Pampanga, Bulacan, Bataan, Zambales, Occidental Mindoro, southern parts of Antique and Iloilo, the northwestern part of Palawan and the southern parts of Negros Oriental and Negros Occidental.
Seasonal Occurrences of Weather Systems
MonsoonsTail end of cold frontIntertropical convergence zoneEasterly WaveTropical Cyclone
NN
EEWW
SS
SOUTHWEST MONSOON
Locally known as Locally known as “HABAGAT”;“HABAGAT”;
Wind is coming from the Wind is coming from the southwest which very southwest which very warm and humid;warm and humid;
Characterized by heavy Characterized by heavy rainfall that may last for a rainfall that may last for a week or more especially week or more especially when there is tropical when there is tropical cyclone east of the cyclone east of the country;country;
Affects the country from Affects the country from Jun to September and;Jun to September and;
The western sections of The western sections of the country mostly the country mostly observed maximum observed maximum rainfall during the period.rainfall during the period.
NN
EEWW
SS
NORTHEAST MONSOON
Locally known as Locally known as “AMIHAN”;“AMIHAN”;
Occurs when the cold Occurs when the cold and intense Asiatic and intense Asiatic winter anticyclone winter anticyclone developed;developed;
From the Siberia as a From the Siberia as a cold and dry air mass, it cold and dry air mass, it gathers moisture as it gathers moisture as it travels across the Pacific travels across the Pacific ocean reaching the ocean reaching the Philippines in the Philippines in the northeast direction;northeast direction;
Affects the Philippines Affects the Philippines especially the eastern especially the eastern sections from October to sections from October to March and; March and;
Characterized by Characterized by widespread cloudiness widespread cloudiness with rains and with rains and thunderstorms.thunderstorms.
Occurs when a region of Occurs when a region of moving cold air mass moving cold air mass overtakes a region of overtakes a region of moving warm air mass;moving warm air mass;
Characterized largely by Characterized largely by an increased cloudiness an increased cloudiness and heavy rains;and heavy rains;
Affects the Philippines Affects the Philippines during the northeast during the northeast monsoon period monsoon period specifically from specifically from November to February;November to February;
Eastern parts of the Eastern parts of the country recorded most of country recorded most of the associated rainfall the associated rainfall
Intertropical Convergence Zone (ITCZ)
ITCZ oscillate by season;
it positioned south of the equator from January to March;
along or a little bit north of the equator in April and May;
then oscillate farther north of the country till September and;
gradually go down by October.
L L L L
Mean Position of the ITCZ
- wavelike perturbations or oscillation embedded in the easterly currents which move from east to west; also known as inverted “ V “ formation; the area west of the of the wave trough is characterized by subsidence (fair weather) while the eastern side by convergence (disturbed weather); affects the country in varying intensities; frequent occurrence during the summer months and or during the transition period; accompanied by cloudiness and rains usually along the eastern coasts/orographic obstacles; and on the weather chart from surface up to 300 hPa easterly component is observed.
TD 35-63KPH TS 64-117KPH T >118KPH
#1 <60kph-36h
#2 61-100kph-24h
#3 101-185kph-18h
#4 185kph-12h
Weather systems
Monsoons (northeast, southwest)
Intertropical Convergence ZoneCold
frontsEasterly wavesTropical cyclones
WIND VELOCITY, RAINFALL , TEMPERAURE,TROPICAL CYCLONE OCCURRENCES
SPDmps
DIR
3
N
3
N
2
NW
2
NNW
2
W
3
SW
2
SW
3
SW
2
NW
3
NE
3
NE
3
NE
JAN FEB MAR
APR MAY JUN JUL AUG SEP OCT NOV
DEC
Average Wind Velocity (1981-2010)
Average Rainfall in millimeters (1981-2010)
J F M A M J J A S O N D7.2
1
3.3
1
7.2
1
29.8
1
205.9
9
313.1
14
470.0
18
570.4
19
413.8
15
128.4
7
32.8
3
3.3
1
Temperature ( ) 1981-2010℃
Average Number of Tropical Cyclone Occurrences (1981-2010)
0
0.5
1
1.5
2
2.5
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
TC
3 TD 3 TS 2 T
Month
2006TROPICAL CYCLONE
Classification Name DurationMaximum
Wind Rainfall Highest Signal in
EffectJanuary TD Agaton* 21-24 February
March TD Basiang* 6-7 April May T Caloy** 17-18 18-SW 66.6
June TS Domeng** 24-26 15-SE 16.2
July T Ester** 6-9 15-SSW 101.2
T Florita 10-14 20-SW 536.3 2 T Glenda 23-26 15-S 159.7 2 TD Henry** 29 - 2.9
August 1 4.7 TD Inday** 6-7 4.2 T Juan* 8-9 TS Katring** 14 1.3
September T Luis** 14-16 331.6 T Melenyo^^ 25-29 10-NE 0.7
October TS Neneng^^ 1-5 12-N TD Ompong 12-13 11-N 11.8 T Paeng 27-31 15-NE 36.6 2
November T Queenie 10-11 14-NNE 0.2 2 T Reming^^ 28 - 14-N
December 3 13-NNE trace T Seniang^^ 7-12 14-NNE 3.8 T Tomas^^ 18-19 11-ENE
Month
2007
TROPICAL CYCLONE
Classification Name DurationMaximum
Wind Rainfall Highest Signal in
Effect
January
February
March
April
May Typhoon Amang* 18 to 20
June
July Typhoon Bebeng** 11 to 13 16.6
August Tropical Storm Chedeng** 5 to 7 224.6
Tropical Storm Dodong** 8 to 9 16 SW 398.9
Typhoon Egay 13 to 18 17 SSW 258.3 1
September Typhoon Falcon* 13 to 14
Typhoon Goring** 15 to 18 10 SSW 65.1
Tropical Storm Hanna 27 to 30 11 North 29.1 1
October Typhoon Ineng 1 to 7 13 NW 51.6 1
Tropical Storm Juaning* 26
November Typhoon Kabayan 3 to 7 16 NNE 30.4 2
Typhoon Lando* 19 to 28
Typhoon Mina 21 to 28 23 North 92.7 3
December
Month
2008TROPICAL CYCLONE
Classification Name DurationMaximum
Wind Rainfall Highest Signal in
EffectJanuary February
March April May TS Cosme 16-18 10-NW 62.2 3
June T Frank 22-23 20-SSW 0.4 2
July TS Helen 14-16 14-WSW 972.5 2
T Igme 25-28 27-WSW 307.1 2
August TS Julian 3 to 5 10-S 107.1 1 T Karen 19-21 30-SW 426.4 3 TD Lawin 27-28 10-SW 44.8 1
September TS Marce 8to12 12-N 151.9 1 T Nina 21-25 28-SW 296.0 3 T Ofel 26-30 14-S 1.4 1
October TD Pablo** 1 to 2 10-SSW 15.9
November TD Rolly** & 9 to 12-N 62.4 TD Quinta** 10
Month
2009TROPICAL CYCLONE
Classification Name DurationMaximum
Wind Rainfall Highest Signal in
EffectJanuary February
March April May TS Emong 5 to 7 74.8 3
June TS Feria** 24 - 25 10-SW 0.4
July TD Gorio 9 to 11 12-SW 429.0 1
TS Huaning** 12 to 14 10.1 TS Isang 16 to 18 19-SW 419.5 2 TS Jolina Jul31 to
August 2-Aug 13-SW 168.4 1 T Kiko 3 to 9 19-SSW 27.9 1
September TS Labuyo** 3 to 5 45.8 TD Maring 9 3.8 1 TD Nando 12 to 13 12-SSE 203.9 1 TS Ondoy^^ 24 to 25 14-NNE 29.0
October T Pepeng 2 to 9 30-SSW 843.4 3 TS Ramil 22 to 23 14-NNW 6.5 3
November TD Tino^^ 2 to 4 17-NNE 9.9
2010 Tropical Cyclone Tracks
Month
2010
TROPICAL CYCLONE
Classification Name Duration
Maximum Wind Rainfall
Highest Signal in Effect
JANUARY
FEBRUARY
MARCH
APRIL
MAY
JUNE
JULY
AUGUST TS DOMENG 4 TO 6 4.8 #2
TS ESTER 7 TO 9 118.9 #1
TD FLORITA 28 TO 29 12SW 5.8
TS GLENDA 30 TO 31 13S 64.8
SEPTEMBER TS HENRY 3 TO 4 42.2
T INDAY 18 TO 19 12SW 16.8
OCTOBER T JUAN 17 TO 22 18N 24.6 #3
T KATRING
