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

I. AGROCLIMATIC SUMMARY::

Partly cloudy to cloudy skies with scattered to occasional rains is the normal weather in the area. The average rainfall amount of 396.6 mm with 14 rainy days. An extreme 24-hr total rainfall amount of 448.2 mm was recorded on September 2, 1986. The longest wet spell of 14 days was also recorded on September 05-30, 2011 (650.4 mm). Normal total evaporation of 123.9 mm are the normal values for the month.

Soil moisture is generally wet. Humid environment prevails with average relative humidity of 86%. Drying condition is poor. Leaf wetness duration is from 6 to 12 hours. Daylight duration is 12 hours and 23 minutes with 39% total bright sunshine. This situation gives an amount of 18.0 MJ/m2of solar radiation during most days of the month. Southerly to northeasterly winds prevail.

Average maximum and minimum air temperature is 31.9 °C and 23.8°C, respectively.

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)
September                    
1-10 150.9 5 70 53 40.1 31.8 23.9 84 17.6 20.8
11-20 149.9 5 70 73 41.2 31.8 23.8 85 17.8 30.4
21-31 94.8 4 60 47 42.7 32.1 23.6 85 18.4 24.8

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

** Probability of having a Tropical Cyclone

III. TROPICAL CYCLONE

Historical record shows that Northern Luzon is within the Normal Tropical Cyclone Track. Normally, 1-2 tropical cyclones affect/cross Ilocos Norte in the month of September. The following tropical disturbances that crossed or passed closed over Ilocos Norte from 1981-2006.

TC Name Year and Date Occurrence
TS Miling Sept 03, 1985
TS Norming Sept 18, 1986
TD Mameng Sept 04, 1987
TD Neneng Sept 08, 1987
TY Maring Sept 20, 1988
TY Openg Sept 08-12, 1989
TY Loleng Sept 05-08, 1990
TS Miding Sept 13-16, 1990
TS Oniang Sept 15-23, 1991
TY Lusing Sept 01-05, 1992
TS Maring Sept 18-23, 1992
TS Yeyeng Sept 13-16, 1993
TS Weling Sept 07-11, 1994
TD Ising Sept 14-17, 1995
TY Luding Sept 21-22, 1995
TY Maring Sept 05, 1996
TD Ningning Sept 10-11, 1996
TS Gading Sept 18-20, 1998
TS Mameng Sept 02-04, 1999
TS Neneng Sept 10-14, 1999
TY Oniang Sept 19-23, 1999
TS Maring Sept 02-06, 2000
TS Ningning Sept 09-11, 2000
TY Osang Sept 11, 2000
TY Labuyo Sept 22-26, 2001
TD Quiel Sept 16-19, 2003
TS Labuyo Sept 21-23, 2005
TY Luis Sept 14-16, 2006
TY Milenyo Sept 25-29, 2006
TY Goring Sept 15-18. 2007
TS Hannah Sept 27-30, 2007
TS Marce Sept 8-12, 2008
TY Nina Sept 21-25, 2008
TY Ofel Sept 26-30, 2008
TS Labuyo Sept 3-5, 2009
TD Maring Sept 9, 2009
TD Lando Sept 12-13, 2009
TS Undoy Sept 24-25, 2009
TS Henry Sept 2-4, 2010
TY Inday Sept 15-19, 2010
TY Pedring Sept 26-28, 2011
TY Lawin Sept 26-28, 2012
TY Odette Sept 19-21, 2013
TD Karding Sept 6, 2014
TY Luis Sept 13-15, 2014
TS Mario Sept 18-21, 2014
TY Jenny Sept 27-29, 2015
TY Ferdie Sept 12-14, 2016
TY Gener Sept 17, 2016
TY Helen Sept 28, 2016
TD Kiko Sept 4-6, 2017
TD Neneng Sept 10-11, 2018
STY Ompong Sept 13-16, 2018
TY Liwayway Sept 4-5, 2019
STS Nimfa Sept 16-20, 2019
STS Onyok Sept 29-30, 2019

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)