Mark Nissenbaum

Meteorologist. Probably sitting by a computer.

[Mark Nissenbaum @NissenbaumMark]

Outer rainbands from #Bavi are approaching Guam and the rest of the Mariana Islands. Live-updating radar loops here: https://t.co/8lKoFUrmrp

[Mark Nissenbaum @NissenbaumMark]

A confirmed 5.05" of rain has now fallen at SFWMD rain gauge S177, southwest of Homestead, FL, and continues to increase as stationary thunderstorms remain overhead. Much needed rain, though a bit much at once. #flwx

[Mark Nissenbaum @NissenbaumMark]

After a bit of downtime, the radar page is back up: https://t.co/e9hzpAr2gw
It now includes some bug fixes and performance improvements. The radar images are generated in NCL, which remains fast, extremely capable, and still holds up very well today. Thanks, NCAR!

[BNO News Live @BNODesk]

Before and after: Some of the devastation in Black River, Jamaica after Hurricane Melissa (📷: @vantortech)

[Mark Nissenbaum @NissenbaumMark]

And now the aircraft observations are catching up with the satellite appearance. 917 mb with 150-155 kt flight levels winds in both the N and SE quadrants. Scary storm. #Melissa

[Mark Nissenbaum @NissenbaumMark]

Now revised to 8.7. Largest earthquake since 2011, it seems.

[USGS Earthquakes @USGS_Quakes]

Notable quake, preliminary info: M 8.0 - 136 km ESE of Petropavlovsk-Kamchatsky, Russia https://t.co/pecsU8xcSy

[Mark Nissenbaum @NissenbaumMark]

The upper low north of #93L's 'center' is producing westerly shear and feeding dry air into the circulation, likely why convection weakened this afternoon. The system will continue to struggle until the low moves out, but enhanced rainfall is still expected over FL.

[Mark Nissenbaum @NissenbaumMark]

60 knots of wind shear ripping across the eastern Caribbean. Not so welcoming for storms, for now.

[Mark Nissenbaum @NissenbaumMark]

@webberweather And then they doubled down the next day and really meant for it to hit the US lol

[Mark Nissenbaum @NissenbaumMark]

@webberweather Reminds me of one of their most famous 'eye paths'...

[Mark Nissenbaum @NissenbaumMark]

• College of Dupage (https://t.co/JtTW3Gqt5S)
• NCAR RAP (https://t.co/dLNydqUmbk)
• PolarWx (https://t.co/JbUG7LQ8YI)
• CyclonicWx (https://t.co/TPWtEsuYfY)
• Weathernerds (https://t.co/SPVbXNXe2X)
• Brian McNold's radar page (https://t.co/nHFe8FI0Y1)

To name a few!

[Mark Nissenbaum @NissenbaumMark]

The server room hosting my radar page (https://t.co/8lKoFUrmrp) is scheduled to shut down later today in preparation for #Idalia.

While this is unfortunate, there are many equivalent (if not, superior) webpages that offer similar imagery:

[continued in next post]

[Mark Nissenbaum @NissenbaumMark]

This is a dangerous storm. Please heed evacuation orders and follow guidance from local, state, and federal agencies. Your safety depends on making the right decisions.

[NWS Tallahassee @NWSTallahassee]

Hurricane #Idalia will likely be an unprecedented event for many locations in the Florida Big Bend. Looking back through recorded history, NO major hurricanes have ever moved through the Apalachee Bay. When you try to compare this storm to others, DON'T. No one has seen this.

[NWS Tallahassee @NWSTallahassee]

Hurricane #Idalia will likely be an unprecedented event for many locations in the Florida Big Bend. Looking back through recorded history, NO major hurricanes have ever moved through the Apalachee Bay. When you try to compare this storm to others, DON'T. No one has seen this.

[Mark Nissenbaum @NissenbaumMark]

As Typhoon #Mawar nears the end of its eyewall replacement cycle, its new eyewall edges dangerously close to Guam. Fascinating to watch unfold on radar: https://t.co/0lcPGeQql2

[Philippe Papin @pppapin]

Here is a long radar loop of #Hurricane #Fiona, where the eyewall is now along the S coast of #PuertoRico.

Unfortunately, flooding impacts likely prolonged as Fiona moves WNW & a large principal rainband on E side maintains substantial upslope rainfall over island. #PRwx 😰

[Mark Nissenbaum @NissenbaumMark]

Woah, the best browser-based download manager ever is back. https://t.co/C2wQXwa4DI

[Mark Nissenbaum @NissenbaumMark]

Interesting mid-level feature west of Key West. Probably one of many I imagine.

[Mark Nissenbaum @NissenbaumMark]

@AndyHazelton #90L reminds me a bit of Mindy from last year. Interesting little swirl.