Dr. Jeff Masters' WunderBlog
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Brazilian tropical/subtropical storm deserves a name; tornadoes rip Arkansas
The unnamed South Atlantic tropical/subtropical cyclone (90Q) off the coast of Brazil continues to spin slowly out to sea, and is not a threat to any land areas. The storm, just the 7th tropical or subtropical cyclone on record in the South Atlantic, has a well-defined surface circulation, top wind speeds near minimum tropical storm force (40 mph), a surface pressure near 1004 mb, and a modest amount of heavy thunderstorm activity on its south side. Strong upper-lev...<br /><a href="http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1446">Read More</a>
Rare South Atlantic subtropical cyclone forms; severe weather season in U.S. ...
A rare weather event is underway in the South Atlantic Ocean, where the basin's 7th recorded tropical or subtropical cyclone of all-time has formed. An area of disturbed weather (Invest 90Q) off the coast of Brazil, near 30S 48W, attained a well-defined surface circulation, top wind speeds of tropical depression strength (35 mph), a warm core in the bottom portion of the atmosphere, and a cold core aloft last night. If this storm had been in the North Atlantic, ther...<br /><a href="http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1445">Read More</a>
Record warmth in Atlantic Main Development Region for hurricanes
Sea Surface Temperatures (SSTs) in the Atlantic's Main Development Region for hurricanes were at their highest February level on record last month, according to an analysis of historical SST data from the UK Hadley Center. SST data goes back to 1850, though there is much missing data before 1910 and during WWI and WWII. The region between 10°N and 20°N, between the coast of Africa and Central America, is called the Main Development Region (MDR) because virtually a...<br /><a href="http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1444">Read More</a>
Little change to Brazilian tropical disturbance
An area of disturbed weather off the coast of Brazil, near 17S 38W, has changed little over the past day. It has a slight potential to develop into subtropical or tropical depression early next week. Satellite winds estimates from the WindSat instrument show an elongated area of converging winds, but no organized surface circulation. Satellite loops show little organization to the cloud pattern, and only limited heavy thunderstorm activity. Wind shear over the regio...<br /><a href="http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1443">Read More</a>
A Brazilian tropical disturbance to watch
An area of disturbed weather has formed off the coast of Brazil, near 18S 38W. This disturbance has the potential to develop into subtropical or tropical depression early next week. Satellite winds estimates from the WindSat instrument show an elongated area of converging winds, but no organized surface circulation. Satellite loops show little organization to the cloud pattern, and only limited heavy thunderstorm activity. Wind shear over the region is about 20 knot...<br /><a href="http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1442">Read More</a>
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