AGROCLIMATIC INFORMATION FOR AGRICULTURAL PLANNING AND OPERATION IN ILOCOS NORTE PARTICULARLY BATAC AND SURROUNDING AREAS FOR THE MONTH OF AUGUST

I. AGROCLIMATIC SUMMARY::

Cloudy to overcast skies with scattered to occasional rains is the normal weather in the area. Total rainfall amount averages 574.5 mm with 18 rainy days. An extreme 24-hr total rainfall amount of 4754.0 mm was recorded on August 27, 2011. The longest wet spell of 17 days was also recorded on August 10-25, 2018 (1120.6 mm). The highest total monthly rainfall amount usually falls in the month of August. Normal total evaporation of 128.3 mm are the normal values for the month.

Soil moisture is generally wet. Humid environment prevails with average relative humidity of 85%. Drying condition is poor. Leaf wetness duration is from 6 to 12 hours. Daylight duration is 12 hours and 50 minutes with 36% total bright sunshine. This situation gives an amount of 17.8 MJ/m2 of solar radiation during most days of the month. Southerly to southeasterly winds prevail.

Average maximum air temperature is 31.5 °C with an extreme of 36.5°C as what was recorded on August 13, 1987. Meanwhile, average minimum air temperature is 24.1°C with an extreme coolness of 17.8°C as what was recorded on August 4, 1977.

II. AGROCLIMATIC DATA (AVERAGE)::

Decade Rainfall Rainy P(W)* P(TC)** Tot AIR TEMPERATURE RH Solar Wind
(10 Day) (mm) days % % evap. Max. Min. (%) Rad. Speed
          (mm) (°C) (°C)   MJ/m2 (kpd)
August                    
1-10 149.4 6 75 67 41.8 31.8 24.2 84 17.4 42.1
11-20 184.0 6 79 63 41.0 31.7 24.2 84 18.0 36.4
21-31 242.1 6 79 67 45.4 31.0 24.0 85 18.1 41.9

* Probability of wet decade (>50 mm per decade)

** Probability of having a Tropical Cyclone

III. TROPICAL CYCLONE

Historical records shows that Northern Luzon is within the Normal Tropical Cyclone Track. The following tropical disturbances that crossed or passed closed over Ilocos Norte from 1981-2006.

TC Name Year and Date Occurrence
TS Openg Aug 17, 1981
TY Norming Aug 24-26, 1982
TD Goring Aug 14-15, 1984
TD Huaning Aug 16, 1984
TS Maring Aug 27-30, 1984
TY Ibiang Aug 19, 1985
TS Luming Aug 26, 1985
TY Ising Aug 17, 1987
TY Gading Aug 15-19, 1990
TS Heling Aug 24-27, 1990
TY Iliang Aug 29-30, 1990
TD Luding Aug 11-13, 1991
TS Isang Aug 27-30, 1992
TS Huling Aug 26-30, 1993
TD Pasing Aug 01-03, 1994
TY Ritang Aug 04-07, 1994
T Susang Aug 17-20, 1994
TD Diding Aug 07-10, 1995
TS Etang Aug 21-23, 1995
TY Gening Aug 25-31, 1995
TD Isang Aug 03-04, 1996
TS Lusing Aug 18-21, 1996
TD Daling Aug 01-10, 1997
TD Ibiang Aug 1997
TS Miling Aug 22-29, 1997
TS Bising Aug 01-04, 1998
TD Klaring Aug 07-09, 1998
TS Luding Aug 18-21, 1999
TY Isang Aug 20-22, 2000
TS Lusing Aug 27-28, 2000
TD Jolina Aug 16, 2001
TS Juaning Aug 01-04, 2003
TD Lakay Aug 18-19, 2003
TY Niña Aug 20-24, 2003
TY Onyok Aug 29-Sept 03, 2003
TY Marce Aug 22-27, 2004
TY Chaba Aug 28, 2004
TS Gorio Aug 02-04, 2005
TS Huaning Aug 11-13, 2005
TY Isang Aug 30-31, 2005
TD Inday Aug 06-07, 2006
TS Chedeng August 5-7, 2007
TS Dodong August 8-9, 2007
TY Egay August 13-18, 2007
TS Julian August 3-5, 2008
TY Karen August 19-20, 2008
TD Lawin August 27-28, 2008
TY Kiko Aug 3-9, 2009
TS Domeng Aug 3-5, 2010
TS Ester Aug 3-5, 2010
TD Florita Aug 27-28, 2010
TY Glenda Aug 29-31, 2010
TY Kabayan Jul 31-Aug 4, 2011
TY Mina Aug 26-31, 2011
TS Gener Jul 29-Aug 2, 2012
TS Helen Aug 14-15, 2012
TS Igme Aug 18-22, 2012
TY Julian Aug 23.29, 2012
TY Labuyo Aug 10-12, 2013
TS Maring Aug 17-20, 2013
TS Nando Aug 27-28, 2013
TY Jose Aug 2-7, 2014
TY Hanna Aug 7-8, 2015
TY Ineng Aug 19-24, 2015
STS Carina Aug 1, 2016
STS Isang Aug 21-22, 2017
TS Jolina Aug 24-26, 2017
TS Karding Aug 10-12, 2018
TD Luis Aug 22-24, 2018
TY Hanna Aug 8-9, 2019
STS Ineng Aug 22-24, 2019
TD Jenny Aug 27-28, 2019
TD Ferdie Aug 8-9, 2020
TD Igme Aug 21-23, 2020
TY Julian Aug 29-31, 2020

TD - Tropical Depression ( >62 kph)

TS - Tropical Storm (62-88 kph)

STS – Severe Tropical Storm (89-117 kph)

TY - Typhoon (118-220 kph)

STY - Super Typhoon (< 222 kph)