Warning "Summer Thunderstorms over upper Thailand." No. 1 (16/2551) Time Issued : March 31, 2008 Moderate high pressure system from China extends its ridge to cover the Northeast and the North by today while day hot occur over Thailand. Thunderstorm, gust, thunderbolts and hail is likely in many places of upper Thailand while impact on the North and the Northeast first and then the others. People in upper Thailand should beware of summer thunderstorm in this period. Thai Meteorological department (02) 398-9874