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At 0845 EDT (12:45 UTC) on 21 September 2018, the MODIS instrument aboard NASA's Terra satellite observed tropical storm Trami (28 W) under infrared light. MODIS found the coldest cloud top temperatures in two large areas, as cold or cold as minus 80 degrees (yellow) Fahrenheit (minus 112 degrees Celsius). They were surrounded by powerful storms with cloud peaks as cold or cold as minus 70 degrees Fahrenheit (minus 56.6 degrees Celsius). Credit: NASA / NRL
On 21 September, NASA's Terra satellite provided an infrared glimpse of tropical storm Trami, located more than 100 miles from Guam. Infrared data provides temperature information in two areas of the vertices
The NOAA National Weather Service (NWS) in Tiyan, Guam, said a flash watch is in effect for the entire Guam region and northern Mariana Islands. A Small Vessel Notice remains in effect until 6 am local CHST time on Sunday, September 23.
However, tropical storm monitoring for Rota, Tinian and Saipan has been canceled. As tropical storm Trami (28W) continues to move away from the Mariana Islands, the threat of destructive winds has come to an end.
At 0220 EDT (0230 UTC) on 13 September, a medium resolution imaging spectroradiometer or a MODIS instrument aboard NASA's Aqua satellite analyzed Hurricane Florence under infrared light. MODIS found the lowest cloud temperatures in two large areas. One was around the traffic center and the other was in a thick band of storms that was winding in the center down. These temperatures were as cold or cold as minus 80 degrees Fahrenheit (minus 112 degrees Celsius). They were surrounded by powerful storms with cloud peaks as cold or cold as minus 70 degrees Fahrenheit (minus 56.6 degrees Celsius).
NASA research has shown that maximum cloud temperatures, as cold or cold as 70F / 56.6C, can generate heavy precipitation.
On September 21st, Trami was located near 15.3 degrees north latitude and 142.9 degrees east longitude. It is about 175 miles west-northwest of Rota and about 180 miles northwest of Guam. Trami moves northwest at 12 mph. We expect a slight turn west-northwest with little change of speed in 24 hours. Maximum sustained winds increased to 40 mph. 28W should intensify until Saturday. The storm winds of tropical storms extend from the center up to 120 miles.
NWS has issued a special weather statement for Micronesia that areas of heavy showers and thunderstorms are near Trami and the monsoon flow southwest of the storm. The monsoon flow from the west through the state of Yap and the Republic of Palau will increase over the next few days. Rainy weather and locally gusty winds are likely for Yap and Koror this weekend. Sea and surf conditions can sometimes become dangerous.
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