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Thursday, March 20, 2014

Weekly Hydro-meteorological Report, 13 March, 2014


Monitoring and Prediction
Existing rainfall condition (less than 4 mm/day) is likely to remain constant till 20th March for the entire country. However, Eastern slopes, Eastern coasts and southern regions are likely to observe increasing pattern of rainfall after 15th of March 2014. For the 13th & 14th regions in Ampara and Batticaloa districts shall receive rainfall compared to the rest of the regions in Sri Lanka.

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Weekly Monitoring:During 5th-7th March 2014, most of the regions in Sri Lanka received rainfall of less than 5 mm compared to the previous weeks. However, Hambantota, Matara and Ampara districts were dry during the entire week.

Monthly Monitoring:Ratnapura district received the highest average rainfall during February 2014 (more than 5mm/day of average rainfall). However during February 2014, entire country experienced below normal rainfall and highest negative anomaly recorded at Batticaloa and Ampara district.


14-day prediction:During 12th-18th March 2014, Southern half of the island shall receive less than 55 mm of rainfall/week. During 19th-25th March, entire Sri Lanka shall receive rainfall of less than 55 mm/week, except for Colombo district and Jaffna peninsula shall receive no or less than 5 mm/week rainfall.

IMD WRF Model Forecast & IRI forecast: For 13th & 14th of March, IMD WRF model predicts insignificant amount of rainfall (less than 3 mm/day) for the regions in Ampara and Batticaloa districts and rest of the regions of the island shall remain dry. IRI model predicts 25-50 mm/6 days of rainfall only for Ampara district for the coming week (12th-17th March 2014).

1 Month Prediction:Overall-Existing rainfall condition (less than 4mm/day) is likely to remain constant till 20th March. Western Slopes and Coast- The rainfall condition is likely to vary drastically during 13th-17th (i.e. with insignificant rainfall peaks and troughs with in small time interval) and thereafter it shall decrease gradually. Western Coast- Rainfall shall decrease gradually till 22nd. Eastern Slopes- Existing rainfall shall decrease gradually till 15th and increase thereafter till 19th. Eastern Coast- The rainfall pattern persisting in the Eastern slopes shall be observed in this region. Northern- Rainfall shall decrease gradually till 20th March. Southern Region- The rainfall is likely to increase gradually after 15th March 2014.

Seasonal Prediction:As per IRI Multi Model Probability Forecast issued on February 2014; for March 2014 to May 2014, there is a 40-45% probability for temperature to be above normal in the country while the rainfall is to be climatological.

PACIFIC SEAS STATE March 6, 2013 :During January through February the observed ENSO conditions moved to the borderline of cool-neutral and weak La Nina. However, most of the ENSO prediction models continue to indicate neutral ENSO into northern spring 2014. During late spring and summer a warming tendency is seen in both dynamical and statistical models.

INDIAN OCEAN STATE :The seas around Sri Lanka showed neutral sea surface temperature during 2nd-8th March 2014.
MJO STATE :MJO is neutral.

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