Vance Forms in the Eastern Pacific; the Atlantic Goes Quiet

By: Dr. Jeff Masters, 3:05 PM GMT on October 31, 2014

Tropical Storm Vance formed in the Eastern Pacific on Thursday afternoon. Satellite images show that Vance is struggling with dry air and wind shear, with just a modest area of heavy thunderstorms that had not improved in organization since Thursday. By Saturday, the wind shear should relent, allowing intensification into a Category 1 hurricane by Sunday. The storm's heaviest rains will remain well offshore from Mexico through Sunday, but our two top models for pred...


95L Little Threat; TD 21E a Long-Range Threat to Mexico's Pacific Coast

By: Dr. Jeff Masters, 3:22 PM GMT on October 30, 2014

An area of disturbed weather (95L) just north of the Virgin Islands is headed northwest at 10 to 15 mph. Satellite loops show that 95L has large, sloppy surface circulation and moderate amount of heavy thunderstorm activity that is mostly disconnected from the center of the storm by high wind shear of 20 - 30 knots. Water vapor satellite images show that 95L has dry air to its west that is likely interfering with development. Sea Surface Temperatures (SSTs) are war...


Updated: 9:35 PM GMT on October 30, 2014

95L No Big Deal; 100 Feared Dead, 300 Missing in Sri Lanka Landslide

By: Dr. Jeff Masters, 3:05 PM GMT on October 29, 2014

An area of disturbed weather (95L) associated with a tropical wave interacting with an upper level trough of low pressure is a few hundred miles northeast of the northern Lesser Antilles Islands, and is headed northwestward to west-northwestward at 10 to 15 mph. Satellite loops show that 95L has a modest amount of spin and heavy thunderstorm activity, but high wind shear of 25 - 30 knots is keeping the thunderstorms disorganized. Water vapor satellite images show th...


A Rare Event: Heavy Rains in Northwest U.S. From an Ex-Hurricane

By: Dr. Jeff Masters, 4:03 PM GMT on October 28, 2014

The heavy rains and strong gusty winds that began affecting the Northwest U.S. and Western Canadian coasts on Monday evening are due to a truly rare event: the remains of a Hawaiian hurricane getting slung into the coast as part of a large extratropical storm. The moisture is from Hurricane Ana, which, after making an extended tour just offshore of the Hawaiian islands last week, died on Sunday afternoon over the Pacific about 1,300 miles west of the California/Oreg...


Updated: 4:21 PM GMT on October 28, 2014

Tropical Storm Hanna Forms Near Nicaragua

By: Dr. Jeff Masters, 2:39 PM GMT on October 27, 2014

The 2014 Atlantic hurricane season kicked out another surprise, as Tropical Storm Hanna formed Monday morning off the coast of Nicaragua just six hours after NHC gave the system a 10% chance of development in their 2 am EDT Tropical Weather Outlook. Surface winds measured overnight by the ASCAT satellite showed sustained winds of 40 mph occurring off the northeast coast of Nicaragua, and visible satellite images just after sunrise on Monday morning confirmed the pre...


Updated: 6:49 PM GMT on October 27, 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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