Invest 99L in Western Caribbean a Threat to Develop on Monday

By: Dr. Jeff Masters, 2:32 PM GMT on August 30, 2014

A tropical wave in the Western Caribbean was designated Invest 99L by the National Hurricane Center on Friday night, and is headed west-northwest at about 15 mph. Satellite loops on Saturday morning showed that 99L had a modest amount of spin and heavy thunderstorms, but these thunderstorms were poorly organized. Sea Surface Temperatures (SSTs) were very warm, near 29°C (84°F), and wind shear was moderate, 10 - 20 knots. Although these conditions are favorable for...


The Tropics Go Quiet World-Wide

By: Dr. Jeff Masters, 3:28 PM GMT on August 29, 2014

Hurricane Cristobal ceased to be at 11 am EDT on Friday, as the storm completed its transition to a powerful extratropical storm. Though Cristobal is no longer a hurricane, it still has hurricane-force winds, and will be a threat to marine interests off the Newfoundland coast today, and to Iceland on Sunday night. With Cristobal's transition to an extratropical storm and the demise of the Eastern Pacific's Tropical Storm Marie earlier today, there are now no named t...


Updated: 3:33 PM GMT on August 29, 2014

Cristobal Headed Towards Iceland; 98L Moving Inland Over Texas

By: Dr. Jeff Masters, 3:38 PM GMT on August 28, 2014

Hurricane Cristobal continues to churn northeastwards over the Atlantic towards Iceland. Satellite loops show that Cristobal has its most impressive appearance of its lifetime, with a large symmetric area of heavy thunderstorms. Cristobal will merge with a frontal zone on Friday and transition to a powerful extratropical storm that will likely bring tropical storm-force winds and heavy rain to Iceland on Sunday night. The GOES-14 satellite is in rapid-scan mode ove...


CRISTOBAL heads Out to Sea / Invest 98 in GOM / Disturbance approaches CARIB

By: Dr. Jeff Masters, 5:05 PM GMT on August 27, 2014

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


CRISTOBAL is located about 360NM SE of Cape Hatteras moving North at around 11Kts. The storm remains a minimal hurricane with sustained surface winds around 65Kts. ALL models call for the storm to turn NNE and then NE at an accelerated pace as an upper air, mid-latitude TROF moves into the Northeastern US. While the storm may see some additional intensific...

Updated: 5:22 PM GMT on August 27, 2014

Cristobal a Hurricane; Little Change to 97L

By: Dr. Jeff Masters, 12:25 PM GMT on August 26, 2014

It doesn't look much like hurricane, but the Hurricane Hunters measured surface winds around 75 mph on Monday evening and Tuesday morning in Hurricane Cristobal, making it the third hurricane of the 2014 Atlantic hurricane season. These missions proved the value of hurricane hunter flights, since there is no way that we would have known Cristobal was a hurricane based on satellite data. The storm is stretched out in a long line of heavy thunderstorms, has no eye or...


« View Older Entries


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

Local Weather

Mostly Cloudy
79 °F
Mostly Cloudy