"Rai" tropical depression has dissolved but it created havoc in vast areas of the country's north and northeastern regions.
Massive downpours unleashed by the storm have inundated several provinces in the northern part.
Hardest hit by flood is Sukhothai.
In Sukhothai province, the municipal area was badly affected by flooding after the swollen Yom river bursted banks in some areas, sending floodwater to submerge homes and roads along the banks.
A 100-metre sandbag embankment built to protect the town's economic zone was also destroyed by the strong current of the swollen river.
The breaking of the embankment forced immediate evacuation of people from their homes last night.
The governor of Sukhothai inspected the embankment last night and ordered immediate repair to ease the situation.
Temporary barriers using sandbags were erected to prevent further flooding in the economic zone.
The extensive overflows have also inundated many sections of the Charod Withee Road in front of the Ban Pak Kaew School under 20 cm of water.
Local authorities are worried more rains today could deteriorate the flood situation.
In Phetchabun's Lomsak district, hospital officials have to evacuate patients as water was rising steadily.
Several government offices and schools were closed today as flooding are still critical.
In Phitsanulok, four districts are still flooded.
Nakornthai district is most affected, followed by Chart Trakarn and Wangthong.
The Wangthong river also bursted banks flooding vast residential and agricultural areas in Wangthong district.
In Lampang province where overflows from Hang Chat and other districts have swollen the Wang river, causing it to burst banks and flood homes in Koh Kha district.
Soldiers from the 32nd Military Circle have been mobilized to erect sandbag embankment to prevent the Wang river to burst banks and flood homes in the Ban Ma Nuer village located in Koh Kha district.
Numerous homes as well as more than 500 rai of agricultural farmland have been damaged.
More sandbags are being hurriedly filled in order to construct more embankment to prevent further flooding.
Water levels are reported to be 50 cm in depth overall but some badly hit areas are reporting levels as high as 1 meter.
Source: Thai Public Broadcasting Service (Thai PBS)