Air Temperatures – The following maximum temperatures were recorded across the state of Hawaii Thursday afternoon:
Lihue, Kauai – 76
Honolulu airport, Oahu – 78
Molokai airport – 76
Kahului airport, Maui – 78
Kona airport – 79
Hilo airport, Hawaii – 78
Air Temperatures ranged between these warmest and coolest spots near sea level – and on the highest mountain tops around the state…as of 510am Friday morning:
Kaneohe, Oahu – 68
Port Allen, Kauai – 59
Haleakala Summit – 36 (near 10,000 feet on Maui)
Mauna Kea Summit – M (near 13,800 feet on the Big Island)
Hawaii’s Mountains – Here’s a link to the live web cam on the summit of near 13,800 foot Mauna Kea on the Big Island of Hawaii. This web cam is available during the daylight hours here in the islands…and when there’s a big moon shining down during the night at times. Plus, during the nights you will be able to see stars, and the sunrise and sunset too…depending upon weather conditions. Here's the Haleakala Crater webcam on Maui…if it's available.
Tropical Cyclone activity in the eastern and central Pacific – Here’s the latest weather information coming out of the National Hurricane Center, covering the eastern north Pacific. You can find the latest tropical cyclone information for the central north Pacific (where Hawaii is located) by clicking on this link to the Central Pacific Hurricane Center. A satellite image, which shows the entire ocean area between Hawaii and the Mexican coast…can be found here. The 2012 hurricane season is over in the eastern and central Pacific…resuming on May 15th and June 1st 2013.
High Surf Warning ~ exceptionally large surf today
on the north and west shores…into the weekend ~ be
careful if you go near those beaches where large waves
High Surf Advisory for west shores of Lanai and Kahoolawe
Small Craft Advisory for extra large northwest swell through
Saturday morning…likely beyond
Wind Advisory for summits on the Big Island…gusts to 35+ mph
Cool northerly breezes, giving a chilly (tropical) feeling
to this morning
A windward shower producing cold front will arrive later today
into Saturday morning, followed by gusty and cool north
winds…and dry weather into Sunday
~~~Air temperature at 528am HST Friday morning,
clear skies and calm winds…at my upcountry Kula,
Maui weather tower: 47.7F degrees~~~
The following numbers represent the most recent top wind gusts (mph), along with directions as of Thursday evening:
16 Puu Opae, Kauai – NW
22 Waianae Harbor, Oahu – NW
10 Molokai – NNE
15 Kahoolawe – WSW
09 Kaupo Gap, Maui – SW
20 PTA Kipuka Alala, Big Island – SW
Here are the latest 24-hour precipitation totals (inches) for each of the islands as of late Thursday evening:
0.58 Kokee, Kauai
0.23 Punaluu Pump, Oahu
0.07 Kaupo Gap, Maui
0.41 Kapapala Ranch, Big Island
We can use the following links to see what’s going on in our area of the north central Pacific Ocean. Here's the latest NOAA satellite picture – the latest looping satellite image…and finally the latest looping radar image for the Hawaiian Islands.
~~~ Hawaii Weather Commentary ~~~
Our winds will be rather light and variable in direction…although with a tendency towards north for the time being. Here's a weather chart showing a near 1023 millibar high pressure center, far to the northeast of Hawaii. At the same time, we see the tail-end of a weak cold front to the east of the Big Island this evening. A second cold front is approaching the state to the northwest…which will arrive later Friday into Saturday morning. Our winds will be increasing from the north as the cold front arrives, lasting through the weekend.
Here's a satellite image, showing variable clouds over the state…with some clear dry areas in places too. This larger satellite view shows shallow areas of low clouds across many areas of the state. This larger satellite photo also shows the next cold front, still well off to the northwest of the state…as well as some thunderstorms along the old cold front well offshore to the northeast and east of the state.
This next cold front will bring showers our way later Friday into Saturday morning, with gusty, cool and drier northerly breezes in its wake…through the weekend. Friday should dawn clear to partly cloudy, with cool temperatures from the tops of the mountains…right down to sea level locations. As there may be somewhat more clouds around tonight, we should see low temperatures dipping into the low to mid 60F's…with even a few upper 50's at sea level if the clouds evaporate overnight. Temperatures in the higher elevations will be even chillier, so I'd suggest keeping that extra blanket on the bed…right through the upcoming weekend! Warmer trade wind weather conditions, along with some passing showers on our windward coasts and slopes, will prevail as we push into next week. I'll be back early Friday morning with your next new weather narrative. I hope you have a great Thursday night wherever you're spending it! Aloha for now…Glenn.
World-wide tropical cyclone activity:
Atlantic Ocean/Caribbean Sea: There are no active tropical cyclones
Gulf of Mexico: There are no active tropical cyclones
Eastern Pacific Ocean: There are no active tropical cyclones
Central Pacific Ocean: There are no active tropical cyclones
Western Pacific Ocean: There are no active tropical cyclones
South Pacific Ocean: There are no active tropical cyclones
North and South Indian Oceans: There are no active tropical cyclones
Interesting: An area of the Amazon rainforest twice the size of California continues to suffer from the effects of a megadrought that began in 2005, finds a new NASA-led study. These results, together with observed recurrences of droughts every few years and associated damage to the forests in southern and western Amazonia in the past decade, suggest these rainforests may be showing the first signs of potential large-scale degradation due to climate change.
An international research team led by Sassan Saatchi of NASA's Jet Propulsion Laboratory, Pasadena, Calif., analyzed more than a decade of satellite microwave radar data collected between 2000 and 2009 over Amazonia. The observations included measurements of rainfall from NASA's Tropical Rainfall Measuring Mission and measurements of the moisture content and structure of the forest canopy (top layer) from the Seawinds scatterometer on NASA's QuikScat spacecraft.
The scientists found that during the summer of 2005, more than 270,000 square miles of pristine, old-growth forest in southwestern Amazonia experienced an extensive, severe drought. This megadrought caused widespread changes to the forest canopy that were detectable by satellite. The changes suggest dieback of branches and tree falls, especially among the older, larger, more vulnerable canopy trees that blanket the forest.
While rainfall levels gradually recovered in subsequent years, the damage to the forest canopy persisted all the way to the next major drought, which began in 2010. About half the forest affected by the 2005 drought – an area the size of California – did not recover by the time QuikScat stopped gathering global data in November 2009 and before the start of a more extensive drought in 2010.
"The biggest surprise for us was that the effects appeared to persist for years after the 2005 drought," said study co-author Yadvinder Malhi of the University of Oxford, United Kingdom. "We had expected the forest canopy to bounce back after a year with a new flush of leaf growth, but the damage appeared to persist right up to the subsequent drought in 2010."
Recent Amazonian droughts have drawn attention to the vulnerability of tropical forests to climate change. Satellite and ground data have shown an increase in wildfires during drought years and tree die-offs following severe droughts. Until now, there had been no satellite-based assessment of the multi-year impacts of these droughts across all of Amazonia.
Large-scale droughts can lead to sustained releases of carbon dioxide from decaying wood, affecting ecosystems and Earth's carbon cycle. The researchers attribute the 2005 Amazonian drought to the long-term warming of tropical Atlantic sea surface temperatures. "In effect, the same climate phenomenon that helped form hurricanes Katrina and Rita along U.S. southern coasts in 2005 also likely caused the severe drought in southwest Amazonia," Saatchi said.
"An extreme climate event caused the drought, which subsequently damaged the Amazonian trees." Saatchi said such megadroughts can have long-lasting effects on rainforest ecosystems. "Our results suggest that if droughts continue at five- to 10-year intervals or increase in frequency due to climate change, large areas of the Amazon forest are likely to be exposed to persistent effects of droughts and corresponding slow forest recovery," he said.
"This may alter the structure and function of Amazonian rainforest ecosystems." The team found that the area affected by the 2005 drought was much larger than scientists had previously predicted. About 30 percent, 656,370 square miles of the Amazon basin's total current forest area was affected, with more than five percent of the forest experiencing severe drought conditions.
The 2010 drought affected nearly half of the entire Amazon forest, with nearly a fifth of it experiencing severe drought. More than 231,660 square miles of the area affected by the 2005 drought were also affected by the 2010 drought. This "double whammy" by successive droughts suggests a potentially long-lasting and widespread effect on forests in southern and western Amazonia.
The drought rate in Amazonia during the past decade is unprecedented over the past century. In addition to the two major droughts in 2005 and 2010, the area has experienced several localized mini-droughts in recent years. Observations from ground stations show that rainfall over the southern Amazon rainforest declined by almost 3.2 percent per year in the period from 1970 to 1998. Climate analyses for the period from 1995 to 2005 show a steady decline in water availability for plants in the region.
Together, these data suggest a decade of moderate water stress led up to the 2005 drought, helping trigger the large-scale forest damage seen following the 2005 drought. Saatchi said the new study sheds new light on a major controversy that existed about how the Amazon forest responded following the 2005 megadrought. Previous studies using conventional optical satellite data produced contradictory results, likely due to the difficulty of correcting the optical data for interference by clouds and other atmospheric conditions.
In contrast, QuikScat's scatterometer radar was able to see through the clouds and penetrate into the top few meters of vegetation, providing daily measurements of the forest canopy structure and estimates of how much water the forest contains. Areas of drought-damaged forest produced a lower radar signal than the signals collected over healthy forest areas, indicating either that the forest canopy is drier or it is less "rough" due to damage to or the death of canopy trees.
Results of the study were published recently in the Proceedings of the National Academy of Sciences. Other participating institutions included UCLA; University of Oxford, United Kingdom; University of Exeter, Devon, United Kingdom; National Institute for Space Research, Sao Jose dos Campos, Sao Paulo, Brazil; Boston University, Mass.; and NASA's Ames Research Center, Moffett Field, Calif.