QuikSCAT's Replacement, the RapidScat Ocean Wind Sensor, Installed on Space Station

By: Dr. Jeff Masters, 3:17 PM GMT on September 30, 2014

In November 2009, one of the greatest success stories in the history of satellite meteorology came to an end when the venerable QuikSCAT satellite failed. Launched in 1999, the QuikSCAT satellite became one of the most useful and controversial meteorological satellites ever to orbit the Earth. It carried a scatterometer--a radar instrument that can measure near-surface wind speed and direction over the ocean. Forecasters world-wide came to rely on QuikSCAT wind data...


Updated: 8:24 PM GMT on September 30, 2014

Invest 97L Spinning Near Bermuda; Phanfone a Potential Threat to Japan

By: Dr. Jeff Masters, 2:27 PM GMT on September 29, 2014

An area of low pressure (Invest 97L) has formed just west of Bermuda, and is bringing heavy rain showers and gusty winds to the island. At 9:45 am AST Monday, the Bermuda Airport reported a waterspout. Winds have gusted as high as 39 mph on the island this morning, and 0.47" of rain had fallen between midnight at 11 am local time on Monday. Satellite loops and Bermuda radar show that 97L has a pronounced low-level spin, but very little in the way of heavy thundersto...


Updated: 8:33 PM GMT on September 29, 2014

Tropical Atlantic Uneventful / Tropical Storm Rachel No Threat

By: Dr. Jeff Masters, 3:18 PM GMT on September 27, 2014

(By Steve Gregory - Substituting for Dr. Masters who is on Vacation.)

Atlantic Basin Hostile to Tropical Cyclone Formation

The weak disturbance that was INVEST 96L is no longer of any significance as it became overwhelmed by both drier and stable air along with increased wind shear. What’s left of the disturbance has turned N/NE.

Although there are 3 other tropical Waves in the Atlantic basin – none pose any threat of devel...


Updated: 12:14 PM GMT on September 28, 2014

Atlantic Disturbance 96L and Tropical Storm Rachel

By: Dr. Jeff Masters, 5:19 PM GMT on September 26, 2014

(By Steve Gregory - Substituting for Dr. Masters who is on Vacation.)


A small area of disturbed weather with periodic bursts of convection near 13°N/42°W remains disorganized as it continues to drift WNW at around 5Kts. Although wind shear remain moderate near 15Kts, there are indications of some outflow at high levels – the system remains surrounded by relatively dry and somewhat stable air which is inhibiting dev...


Updated: 5:25 PM GMT on September 26, 2014

96L Little Threat; Arctic Sea Ice Bottoms Out at 6th Lowest Extent on Record

By: Dr. Jeff Masters, 1:04 PM GMT on September 25, 2014

In the Atlantic, a small area of low pressure (Invest 96L) formed Wednesday evening in the middle Atlantic Ocean near 15°N 45°W, about halfway between the Lesser Antilles Islands and the Cape Verde Islands. Satellite loops show that 96L has a pronounced low-level spin, but only a small amount of heavy thunderstorms. Water vapor satellite loops show 96L is surrounded on all sides by large amounts of dry air. With wind shear expected to stay moderate for the next fi...

Hurricane Sea Ice

Updated: 1:06 PM GMT on September 25, 2014

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Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.

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