As per a recent post on the matter, Tropical Storm Danny has developed into a hurricane. However, this is a most unusual hurricane given its size. It is a tiny hurricane currently located at 12.8 degrees north and 45.3 degrees west.
MODIS (Worldview) provides the ability to measure such storms and when scaled, the storm has a diameter of no more than 200 km from edge to edge. The scale of the MODIS Worldview image provided (Acquired from NASA 20 August 2015) is 3 cm per 100 km. Even more amazing is that the storm has developed a eye which is visible. The eye is very tiny and appears to be no larger than 12 km in diameter.
The CIMSS model (Acquired 20 August 2015) does not identify the eye of the storm.
This is clearly a hurricane being a Category 1 hurricane with winds of 70 knots at the centre (Approximately 130 km/h). The storm does not pose any threat to the United States and given its size and likely wind shear, it is likely to break apart after 36 hours. The storm is currently moving towards the Leeward Islands.
This is certainly one interesting hurricane due to its size. It does have a narrow band of convection surrounding its eye as evident by the cumulonimbus clouds visible on the MODIS Worldview image attached but its lifespan is expected to be limited.
A Hurricane Hunter plane operated by NOAA has flown into the hurricane with astounding results. At the time of the fly through, readings identified a tiny eye with a central pressure of 974 MB. What is more amazing, at the time the plane was flying at 12,000 feet (Approximately 3,600 metres), wind gusts were found to be 111 knots (Approximately 205 km/h). Closer to the ground, winds were found to be around 100 knots (Approximately 185 km/h). The storm may have reached albeit briefly a low end Category 3 storm. Despite its size, this is an impressive little hurricane. The eye has now filled in and given circumstances, the storm has commenced its weakening phase (Source CIMSS 21/8/15). This demonstrates that even a small hurricane can produce intense winds.