Danielle now a Category 2 hurricane

From NASA via press release

Caption: This high-resolution image from the MODIS instrument that flies about NASA’s Terra satellite was taken shortly after the AIRS image from the Aqua satellite on Aug. 23, and also shows a compact, rounded tropical storm Danielle. Danielle became a hurricane just over three hours later.

NASA’s Aqua, Terra and TRMM satellites are providing data on Hurricane Danielle daily, and forecasters are using that data to help determine Danielle’s behavior and movement. At 5 p.m. EDT yesterday, August 23, when Danielle became a hurricane, these NASA satellites fed forecasters data on cloud extent and formation, cloud top temperatures, pressure, sea surface temperatures, rainfall rates within the storm and more factors.

By 5 a.m. EDT today, August 24, Danielle had reached Category 2 status on the Saffir-Simpson Scale. That means that it has maximum sustained winds between 96-110 mph (83-95 knots), and has “Extremely dangerous winds will cause extensive damage” if it impacts land areas. For more information about the Saffir-Simpson Hurricane scale, go to: http://www.nhc.noaa.gov/aboutsshws.shtml.

The Tropical Rainfall Measuring Mission satellite (TRMM) has been measuring Danielle’s rainfall from space since it developed. On Monday, August 23 at 05:38 UTC (1:38 a.m. EDT) TRMM flew directly over Danielle and measured its rainfall with the TRMM Microwave Imager (TMI) instrument. At that time, there was a large area of moderate to heavy rainfall of over 50 mm/hr (~2 inches) in Danielle around it’s center. The rainfall images are at NASA’s Goddard Space Flight Center in Greenbelt, Md.

On August 23 at 16:17 UTC (12:17 p.m. EDT) an infrared image of Hurricane Danielle’s clouds from the Atmospheric Infrared Sounder (AIRS) instrument aboard NASA’s Aqua satellite showed a tightly compact cyclone. The strongest convection and thunderstorms appeared as a large circle in the inside of the storm. The thunderstorms were so high, and powerful that the infrared data measured their temperatures as cold as or colder than -63 Fahrenheit. NASA’s Jet Propulsion Laboratory in Pasadena, Calif. creates the images from the AIRS instrument.

Caption: This infrared image of Danielle’s clouds from NASA’s Aqua satellite was captured on Aug. 23 at 16:17 UTC (12:17 p.m. EDT) and shows a tightly compact cyclone. The strongest convection (and thunderstorms) are colored in purple and appear as a large circle in the inside of the storm. The purple coloration indicates highest cloud tops as cold as or colder than -63 Fahrenheit.

Credit: NASA JPL, Ed Olsen

Another instrument on NASA’s Aqua satellite helped find the center of Danielle early this morning. At 04:34 UTC (12:34 a.m. EDT), Danielle’s eye (that developed yesterday) was no longer evident, indicating that it was obscured by clouds. Using the Advanced Microwave Scanning Radiometer – Earth Observing System (AMSR-E) instrument that flies on Aqua, microwave imagery helped locate the center and confirmed that Danielle’s center was just left of the previous estimate.

One hour and fifteen minutes after Aqua’s AIRS instrument captured an infrared image, the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument on NASA’s Terra satellite captured a high-resolution visible image of Danielle. MODIS images are created by the MODIS Rapid Response Team at NASA Goddard. The data that was captured on August 23 at 1:50 p.m. EDT also showed a compact, rounded, tropical storm Danielle. Danielle became a hurricane just over three hours later.

Caption: On Monday, Aug. 23 at 1:38 a.m. EDT the Tropical Rainfall Measuring Mission (TRMM) satellite flew directly over Danielle and measured its rainfall. TRMM noticed a large area of moderate to heavy rainfall of over 50 mm/hr (~2 inches) in Danielle (in red).

Credit: NASA TRMM, Hal Pierce

At 5 a.m. EDT on August 24, Danielle became a category 2 hurricane with maximum sustained winds of 100 mph. Hurricane-force winds currently extend 30 miles out from the center, while tropical storm-force winds extend 115 miles from the center.

Danielle is moving west at 20 mph, and was still far away from land areas. Danielle’s center was located about 1,110 miles east of the Lesser Antilles near 15.9 North and 44.6 West. A turn toward the west-northwest and then northwest is expected by early Wednesday, according to the National Hurricane Center, Miami, Fla. Danielle’s estimated minimum central pressure is 973 millibars.

Global computer models show Danielle remaining in an environment with low vertical wind shear for the next 24 hours over warm water temperatures between 28 and 29 Celsius (82 and 84 FahreLow wind shear and warm waters help power a tropical cyclone (the general name for tropical depressions, tropical storms and hurricanes). Those factors are expected to help Danielle continue to intensify over the next 24 hours, so Danielle could become a major hurricane (Category 3) by Wednesday, August 25.


For all tropical cyclone updates from NASA’s Hurricane page: www.nasa.gov/hurricane.


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Henry chance
August 24, 2010 7:31 am

Let me be the first to say this storm is because of global warming. It could have been prevented if the party of NO had fallen for energy taxes.
Climateprogress is preparing for outbursts and hand wringing.
A really bad hurricane as on the cover of alGore’s presentation will reverse rotation.

August 24, 2010 7:37 am

I may be going out on a limb here, but I’ve been Mark I eyeballing Danielle since late yesterday/ and all day today (24th) and in my considered opinion the storm’s intensity seems to have diminished. Yes, increased in size, but the deep reds and purples at the core of the hurricane appearing on the NOAA website late yesterday are getting smaller and the “power” centre is now dissipating and spreading itself over a much greater area…
One will see. Bet it’s downgraded back to Cat1 by tomorrow.
REPLY: I agree, watch this animation: http://cache1.intelliweather.net/imagery/KPAY/sat_atlantic_640x480_img.htm

Dave Springer
August 24, 2010 7:39 am

You know maybe if this hurricane were happening in January or it threatened to make landfall it would be worth one article per day on it. But it’s neither. Save the bandwidth for the important or unusual not the mundane.

August 24, 2010 7:45 am

I will admit that it looked very healthy until very early this morning, EDT. But, from the latest satellite loop the cyclone appears to be falling apart.
I think I understand pulses and eyewall replacement cycles….but…
Losing its central dense overcast….and losing the characteristic “artists’s brush blur” of cirrus showing healthy outflow.
Weird….and it doesn’t look like upper level shear blowing it apart.
It just looks like its falling apart.
Are my eyes deceiving me?
Norfolk, VA, USA

Leon Brozyna
August 24, 2010 8:05 am

Danielle’s not playing nice; it was supposed to be on track to turn into a Cat 3 storm. Instead, its winds have decreased to 80 mph and a Cat 1 storm. Ahh, the delicious irony if it upends the models.

August 24, 2010 8:15 am

savethesharks says:
August 24, 2010 at 7:45 am
Yeah, looks like it’s diminishing. The L, M and H wind patterns appear to be going in the same direction, though there also appears to be a pull to the NE and SSW.
Question: Can the sun beating on it, iow, day/night, cause a cyclone fluctuate?
Another question: Can the Coriolis Effect cause something like shear? Models are projecting Danielle to move NW, yet the winds are all to the west.

Douglas DC
August 24, 2010 9:38 am

I’d say she’s diminishing too. So much for computer models. Now ask me why I don’t believe the 100-year projections….
One other thing, (Putting on rumpled trenchcoat and lighting cigar,) those stratospheric
cloud tops-isn’t that a neat way of radiating heat into space,as in very efficiently?..
“Columbo ” fan here…

August 24, 2010 1:20 pm

[Mods;double posted this on both threads delete whichever one not needed]
Chris; Just some dry air being pulled into the systems as the secondary lunar tidal bulge slides back toward the equator, when the moon crosses the equator on the 26th, the primary bulge effects will start to pull these all north again.
Should be moving faster by the 27th, 28th, then powering up heading for the North Western point of it’s path by the 30th, 31st.

George E. Smith
August 24, 2010 4:10 pm

Can you see all those clouds communicating with each other there out to the west of Daniellle; they all seem to be fleeing the scene; as if somebody didn’t feed the parking meter.

August 24, 2010 8:12 pm

Is this going to ‘count’ towards NOAA estimates for this season?
Give me a break!
For all I know this could be the product of Hollywood back-lot special-effects software …

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