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Ana's Path Being Mapped by NASA Satellites, She's Drenching Puerto Rico
August 18, 2009Tropical Depression Ana is currently drenching Puerto Rico, and tropical storm watches are posted for Puerto Rico and the Virgin Islands as Ana continues westward. Both the Aqua and GOES satellites have captured Ana on her westward track in the Atlantic.
For a live look at the National Weather Service Radar in Puerto Rico, go to: http://radar.weather.gov/radar.php?rid=JUA&product=NCR&overlay=11101111&loop=yes.
Ana is expected to produce rainfall amounts of 2 to 4 inches over Puerto Rico, the U.S. and British Virgin Islands and the Dominican Republic with isolated maximum amounts of 6 inches over mountainous terrain.
Tropical Depression Ana has taken a long time to get going and she's still squeaking by as a tropical depression. Over the weekend, NASA satellite imagery captured her short stint as a tropical storm, but she's weakened again and is expected to now rain on Hispaniola before heading to Florida.
By 11 a.m. EDT on Monday, August 17, Ana's center was located 75 miles south of San Juan, Puerto Rico, near 17.3 north and 66.2 west. She was moving at a good clip toward the west-northwest near 28 mph, which means that she won't linger as long and dump as much rain. However, she's expected to slow down in the next day or two. Maximum sustained winds remain near 35 mph, and minimum central pressure is 1008 millibars.
The Atmospheric Infrared Sounder (AIRS) flies on Aqua and provides visible, infrared and microwave images and measures cloud top temperature and pressure. AIRS captured an image of Ana on August 15 when she was a tropical storm and had good cloud formation. By mid-day on August 16, Ana deteriorated into a tropical depression.
How does infrared imagery know how high clouds are in the sky? The coldest ones are higher in the sky (because in the troposphere, the lowest layer of atmosphere where weather happens, temperatures fall the higher up you go until you get to the stratosphere). The highest clouds are as cold as or colder than 220 Kelvin or minus 63 degrees Fahrenheit (F) and second highest level of clouds are about 240 Kelvin, or minus 27F. The colder the clouds are, the higher they are, and the more powerful the thunderstorms are that make up the cyclone.
Another satellite that NASA uses is the Geostationary Operational Environmental Satellite, or GOES. GOES-12 covers the Atlantic Ocean, and is managed by NOAA. On August 17 at 12:15 p.m. EDT, GOES-12 captured Tropical Depression Claudette over Alabama, and Tropical Depression Ana raining on Puerto Rico.
Forecasters are closely watching Ana because she may degenerate further. However, her remnants or the depression, whichever she becomes, is expected to track to Florida's west coast.
NASA Goddard Space Flight Center
Tropical Depression Ana has taken a long time to get going and she's still squeaking by as a tropical depression. Over the weekend, NASA satellite imagery captured her short stint as a tropical storm, but she's weakened again and is expected to now rain on Hispaniola before heading to Florida.
By 11 a.m. EDT on Monday, August 17, Ana's center was located 75 miles south of San Juan, Puerto Rico, near 17.3 north and 66.2 west. She was moving at a good clip toward the west-northwest near 28 mph, which means that she won't linger as long and dump as much rain. However, she's expected to slow down in the next day or two. Maximum sustained winds remain near 35 mph, and minimum central pressure is 1008 millibars.
The Atmospheric Infrared Sounder (AIRS) flies on Aqua and provides visible, infrared and microwave images and measures cloud top temperature and pressure. AIRS captured an image of Ana on August 15 when she was a tropical storm and had good cloud formation. By mid-day on August 16, Ana deteriorated into a tropical depression.
How does infrared imagery know how high clouds are in the sky? The coldest ones are higher in the sky (because in the troposphere, the lowest layer of atmosphere where weather happens, temperatures fall the higher up you go until you get to the stratosphere). The highest clouds are as cold as or colder than 220 Kelvin or minus 63 degrees Fahrenheit (F) and second highest level of clouds are about 240 Kelvin, or minus 27F. The colder the clouds are, the higher they are, and the more powerful the thunderstorms are that make up the cyclone.
Another satellite that NASA uses is the Geostationary Operational Environmental Satellite, or GOES. GOES-12 covers the Atlantic Ocean, and is managed by NOAA. On August 17 at 12:15 p.m. EDT, GOES-12 captured Tropical Depression Claudette over Alabama, and Tropical Depression Ana raining on Puerto Rico.
Forecasters are closely watching Ana because she may degenerate further. However, her remnants or the depression, whichever she becomes, is expected to track to Florida's west coast.
NASA Goddard Space Flight Center
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Microwave satellite imagery has revealed that Tropical Storm Mirinae is strengthening enough to develop an eye, and that's what it's doing. Mirinae was formerly Tropical Depression 23W, but became a tropical storm and received its name.
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NASA's TRMM satellite captures Typhoon Melor as it reaches Japan
Melor began as a tropical depression back on the 29th of September 2009 about 1000 miles (~1600 km) east-southeast of Guam in the Northern Mariana Islands.
The Philippines may finally get a break from Tropical Depression Parma
The Philippines can't seem to get rid of what is now a deadly and annoying Tropical Depression Parma, but forecasters are now providing hope.
It's a Boy? Tropical Depression 18-E Forms in the Eastern North Pacific
At 11 a.m. EDT on October first, the eighteenth tropical depression of the Eastern Pacific hurricane season was born.
NASA satellite sees Hurricane Jimena explode in strength over 4 days
Hurricane Warnings are up for the southern Baja California, as powerful Category Four Hurricane Jimena threatens. Jimena developed over the weekend, and the infrared instrument on NASA's Aqua satellite captured that explosive development.
Two NASA Satellites Captures Hurricane Bill's
Bill was the third tropical depression in the Atlantic Ocean hurricane season, behind Ana and Tropical Depression One. Over the weekend Bill grew into the first hurricane in the Atlantic this season. Two NASA Satellites captured Bill's rainfall and cloud temperatures as he was powering up.
Tropical Storm Claudette Makes Landfall in Florida, Moving Into Mississippi
By mid-day today, Monday, August 17, Claudette's center had moved into southwestern Alabama and weakened into a tropical depression. She'll turn toward the north-northwest later today and soak Alabama with up to 10 inches of rain in some isolated areas.
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