The big anomaly occurred in the upper part of the Gulf of Thailand in which the typhoon was passing toward the coast. The highest value of sea surface anomaly is about 60 cm in the Cha-Am area. At Huahin, Rayong and Ko Chang the sea surface anomalies are 46,33 and 25 cm respectively. The averaged sea surface anomaly in the lower Gulf of Thailand is 5 cm, and in the upper Gulf of Thailand is 23 cm. It can be clearly concluded that the effects of the storm surge are a serious concern at the upper gulf when the typhoon moves northwestward through the northern Gulf of Thailand .