Looks like Matt is going through an ERC.

[B2G]

Could be bad if it completes. Could weaken him a bit if it doesn't. Worth noting.

[PearliePoo2]

1. Eyewall? What does ERC mean? nt.

[Jim__]

2. Eyewall replacement cycle?

From wikipedia:

Eyewall replacement cycles, also called concentric eyewall cycles, naturally occur in intense tropical cyclones, generally with winds greater than 185 km/h (115 mph), or major hurricanes (Category 3 or above). When tropical cyclones reach this intensity, and the eyewall contracts or is already sufficiently small, some of the outer rainbands may strengthen and organize into a ring of thunderstorms—an outer eyewall—that slowly moves inward and robs the inner eyewall of its needed moisture and angular momentum. Since the strongest winds are in a cyclone's eyewall, the tropical cyclone usually weakens during this phase, as the inner wall is "choked" by the outer wall. Eventually the outer eyewall replaces the inner one completely, and the storm may re-intensify.

The discovery of this process was partially responsible for the end of the U.S. government's hurricane modification experiment Project Stormfury. This project set out to seed clouds outside the eyewall, apparently causing a new eyewall to form and weakening the storm. When it was discovered that this was a natural process due to hurricane dynamics, the project was quickly abandoned.[1]

Almost every intense hurricane undergoes at least one of these cycles during its existence. Recent studies have shown that nearly half of all tropical cyclones, and nearly all cyclones with sustained winds over 204 kilometres per hour (127 mph; 110 kn), undergo eyewall replacement cycles.[2] Hurricane Allen in 1980 went through repeated eyewall replacement cycles, fluctuating between Category 5 and Category 3 status on the Saffir-Simpson Hurricane Scale several times. Hurricane Juliette (2001) was a rare documented case of triple eyewalls.[3] Typhoon June (1975) was the first reported case of triple eyewalls.[4]

more ...

[MADem]

3. DU makes me smarter--this is just one of many examples! Thanks! nt

[B2G]

6. Sorry, was in a hurry.

Thanks to those who explained.

[teach1st]

4. It does look that way

https://twitter.com/bn9weather/status/784100776775782400/photo/1

@Mike_Clay At 2:37 pm Thu radar showing concentric eyewalls. Eyewall replacement cycle into this evening.

[randome]

5. Matt Lauer is having an Emergency Rectal Collapse? Good heavens!

[hr][font color="blue"][center]Treat your body like a machine. Your mind like a castle.[/center][/font][hr]

[eShirl]

7. Now he'll never get his head out.

[randome]

8. Good.

[hr][font color="blue"][center]Treat your body like a machine. Your mind like a castle.[/center][/font][hr]