Navigation Links
GOES-13 sees a weaker Hurricane Julia in the 'tropical trio'
Date:9/16/2010

GOES-13 satellite imagery this morning showed the "tropical trio": Tropical Storm Karl over the Gulf of Mexico, Hurricane Igor in the central Atlantic, and a waning Hurricane Julia in the eastern Atlantic Ocean. Hurricane Julia has now lost her Category 4 Hurricane status, and is currently a Category 2 hurricane in the eastern Atlantic and weakening. Wind shear, cooler sea surface temperatures and warmer cloud top temperatures all spell a weaker Julia.

The Geostationary Operational Environmental Satellite known as GOES-13 that monitors weather over the U.S. East Coast and the Atlantic Ocean basin captured an amazing visible image of the three tropical cyclones at 1145 UTC (7:45 a.m. EDT).

GOES satellites are operated by NOAA. The NASA GOES Project at NASA's Goddard Space Flight Center in Greenbelt, Md. uses the data from GOES satellites and creates images and animations.

In this morning's GOES-13 image, Karl is a tightly wound tropical storm that appears to be strengthening today over the Bay of Campeche. Farther to the east and in the open waters of the central Atlantic, the massive and powerful Hurricane Igor spins toward Bermuda. Igor is twice as large as Hurricane Julia today as is evident in the GOES-13 image.

Igor's 550 mile cloud cover dwarfs Karl (in the Gulf of Mexico) and Hurricane Julia (which is about 280 miles in diameter) located in the eastern Atlantic Ocean. In the GOES-13 visible image, Julia's eye is no longer visible indicating that the storm has weakened considerably over the last day.

At 5 a.m. EDT today, Sept. 16, Hurricane Julia's maximum sustained winds were near 105 mph. She is centered about 875 miles west-northwest of the Cape Verde Islands, near 21.2 North and 36.2 West. She's moving northwest near 18 mph and her minimum central pressure is 970 millibars.

What is Weakening Hurricane Julia?

Wind shear and cooler sea surface temperatures are responsible for Julia's weakening overnight. Wind shear, created by the mid-to-upper level trough (elongated area of low pressure) between Julia and Igor has generated a 20 to 30 knot wind shear over Julia. Those winds, blowing from the southwest are acting to push the main convection (rapidly rising air that creates the thunderstorms that power a tropical cyclone) to the north of Julia's center causing her to weaken.

Whenever the main convection is pushed away from the center of a tropical cyclone, it weakens. Imagine the center of a storm looking like a haystack, and wind shear or strong winds blow the top of the haystack away. That's what's happening with Julia.

Infrared imagery from the Atmospheric Infrared Sounder (AIRS) instrument that flies on NASA's Aqua satellite revealed that Julia's cloud top temperatures are warming today. Yesterday, those cloud top temperatures were colder than -65 degrees Fahrenheit. Today, they are less cold indicating that they're not as high, i.e., the thunderstorms are not as strong. The rule for thunderstorms is that the higher they are, the more powerful they are. When the cloud top heights fall, so does the storm's punch.

In addition, the sea surface temperatures where Julia is now located are between 78 and 80 degrees Fahrenheit (26-27 Celsius). A tropical cyclone needs sea surface temperatures of at least 80F to maintain intensity. As Julia continues to track to the north, the sea surface temperatures will continue to cool, taking away her fuel. That's why the National Hurricane Center has forecast additional weakening of Julia over the next 48 hours.


'/>"/>

Contact: Rob Gutro
Robert.j.gutro@nasa.gov
443-858-1779
NASA/Goddard Space Flight Center
Source:Eurekalert  

Related biology news :

1. Grandpas broken hip may mean weaker bones for his grandsons
2. Men are the weaker sex
3. Oceans color affects hurricane paths
4. Windy cities: Researchers invent new tool to calculate hurricane risk
5. Chances of hurricane hitting Texas discussed at UH conference
6. New research reveals Hurricane Katrinas impact on ecological and human health
7. Hurricane-Proof Your Information
8. 2010 Central Gulf of Mexico Hurricane Conference, Baton Rouge, March 16-17
9. A forensic analysis of Hurricane Katrinas impact: methods and findings
10. University of Miami receives stimulus funds for study of hurricane impacts on structures, ecosystems
11. UH team analyzes Hurricane Ikes effects on waterways, fish contamination
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
GOES-13 sees a weaker Hurricane Julia in the 'tropical trio'
(Date:2/7/2017)... New York , February 7, 2017 ... as ID Global Solutions Corporation [OTC: IDGS], ("Ipsidy" or ... management and electronic transaction processing services, is pleased to ... of the Company. Effective January 31, 2017, ... the Board of Directors, CEO and President.  An experienced ...
(Date:2/2/2017)...   TapImmune, Inc. (NASDAQ: ... the development of innovative peptide and gene-based immunotherapeutics ... metastatic disease, announced today it has successfully completed ... second clinical lot of TPIV 200, the company,s ... manufactured vaccine product will be used to supply ...
(Date:1/31/2017)... 2017  Spero Therapeutics, LLC, a biopharmaceutical company ... of bacterial infections, today announced it has acquired ... Pro Bono Bio Ltd (PBB) to bolster its ... forms of Gram-negative bacteria.   The assets acquired have ... PBB group company. "The acquisition of ...
Breaking Biology News(10 mins):
(Date:2/23/2017)... RAFAEL, Calif., Feb. 23, 2017 ... U.S. dollars, except per share data, unaudited)Three Months Ended ... ChangeTotal BioMarin Revenue $   ...   22832%$ 1,117$   89026%Aldurazyme Net Product Revenue ... 906538%34823946%Naglazyme Net Product Revenue  ...
(Date:2/23/2017)... , Feb. 23, 2017  Seattle,s upscale Capitol Hill neighborhood, ... strange place for a head lice treatment salon to set ... a Tuscan restaurant and a French bistro on E Madison ... "We aren,t just any old lice clinic, we pride ourselves ... comfortable, and release some of the stigma associated with lice. ...
(Date:2/23/2017)... ... February 23, 2017 , ... Today, researchers can ... adiponectin, uric acid, and/or other biomarkers or SNPs of interest) using one, easy-to-collect ... SalivaLab , the relationship between insulin and other relevant biomarkers can be extensively ...
(Date:2/23/2017)... Washington, USA, and CARDIFF, UK (PRWEB) , ... ... ... the international society for optics and photonics , have been named Fellows of ... individual’s significant scientific and technical contributions in the multidisciplinary fields of optics, photonics, ...
Breaking Biology Technology: