Mid January 2020 and still no monsoon arrival. Getting quite late but not yet the latest date recorded.
However, it could be some time away with a few of the global weather drivers looking decidedly dodgy ie not especially positive for a monsoon burst anytime soon.
Read the current Tropical Climate Note from earlier this week [http://www.bom.gov.au/climate/tropical-note/ ] and note the eastwards movement of the MJO away from our region, usually negative for rain across N Australia.
Today's weather reports refer to hot and drier conditions across the north over the next few days, although there may be storms.
Please continue to wait.......and wait...........and wait.
---------------------------------------------
3 February 2020 - UPDATE - now coming .........the monsoon onset!! Latest ever for Darwin and even now it is still not quite here YET. Maybe in a few days still. While a monsoonal low is moving west several hundred kms SW of Darwin, officially not yet for Darwin!
Showing posts with label monsoon. Show all posts
Showing posts with label monsoon. Show all posts
Thursday, January 16, 2020
Friday, January 25, 2013
Asian Monsoon May be Predictable - Early
A lot has been done to advance the predictions about the NW monsoon across Australia. BUT - this year it seems to be definitely off - but forcasters did indicate that there were no strong signals, so that makes for tricky predicting.
Of more importance has been the machinations of the Asian monsoon which has enormous influences on the agriculture and urban life in the region. For example, the recent flooding in Jakarta, and seasonal typhoons in the area.
The correlations are not fantastic - with 65% indicated, but refinements are certainly possible.
The news article is worth reproducing - and for the interested read the full report. AND -watch out out for more.
Asian Monsoon Predictions Take Great Leap Forward
There are few other weather phenomenon which effect a country's agriculture, economy, and people greater than the Monsoon. The monsoon is defined as a seasonal reversing of wind accompanied by a significant change in precipitation. For many parts of the world, and particularly south Asia, the monsoon provides much needed rainfall. However, the amount of rainfall and number of tropical storms brought about by each year's monsoon has been extremely difficult to predict. Scientists from the International Pacific Research Center at the University of Hawaii at Manoa have made a breakthrough for predicting the summer monsoon rainfall over East Asia as early as the spring of that year.
If the WPSH is strong during the summer, the rainfall tends to be above average in East Asia and there tend to be fewer tropical storms that make landfall.
Using computer modeling, they found out that summer fluctuations in the WPSH are over 65% predictable by the spring. Things that make the WPSH stronger than usual include dipolar sea surface temperature anomalies in the ocean. This happens when unusually warm Indian Ocean hits the unusually cool western North Pacific water. If this occurs, there will be greater summer monsoon rainfall over East Asia and the Ganges Valley in India.
"Our findings create a promising way for predicting monsoon rainfall and tropical storm days during the East Asian summer," concludes lead author Bin Wang, meteorology professor at the University of Hawaiʻi at Mānoa and faculty at the International Pacific Research Center. "As a first step, we use global general circulation models to predict the fluctuations in the WPSH, and then in a second step, we use this forecast to predict rainfall and storm days in regional analyses. We have done hindcasts from 1979 to 2009 using this approach and have found substantially improved skills over the use of dynamical climate models in predicting the East Asian Summer Monsoon rainfall and tropical storm activity."
This study has been published in the Proceedings of the National Academy of Sciences
[ reproduced from ENN, 25 Jan 2013]
Of more importance has been the machinations of the Asian monsoon which has enormous influences on the agriculture and urban life in the region. For example, the recent flooding in Jakarta, and seasonal typhoons in the area.
The correlations are not fantastic - with 65% indicated, but refinements are certainly possible.
The news article is worth reproducing - and for the interested read the full report. AND -watch out out for more.
Asian Monsoon Predictions Take Great Leap Forward
There are few other weather phenomenon which effect a country's agriculture, economy, and people greater than the Monsoon. The monsoon is defined as a seasonal reversing of wind accompanied by a significant change in precipitation. For many parts of the world, and particularly south Asia, the monsoon provides much needed rainfall. However, the amount of rainfall and number of tropical storms brought about by each year's monsoon has been extremely difficult to predict. Scientists from the International Pacific Research Center at the University of Hawaii at Manoa have made a breakthrough for predicting the summer monsoon rainfall over East Asia as early as the spring of that year.
The East Asian monsoon affects parts of Indo-China, Philippines, China, Korea, and Japan. The researchers found that this monsoon and its related storm activity are controlled by fluctuations in the western Pacific Subtropical High (WPSH), a major circulation system centered over the Philippine Sea.
If the WPSH is strong during the summer, the rainfall tends to be above average in East Asia and there tend to be fewer tropical storms that make landfall.
Using computer modeling, they found out that summer fluctuations in the WPSH are over 65% predictable by the spring. Things that make the WPSH stronger than usual include dipolar sea surface temperature anomalies in the ocean. This happens when unusually warm Indian Ocean hits the unusually cool western North Pacific water. If this occurs, there will be greater summer monsoon rainfall over East Asia and the Ganges Valley in India.
"Our findings create a promising way for predicting monsoon rainfall and tropical storm days during the East Asian summer," concludes lead author Bin Wang, meteorology professor at the University of Hawaiʻi at Mānoa and faculty at the International Pacific Research Center. "As a first step, we use global general circulation models to predict the fluctuations in the WPSH, and then in a second step, we use this forecast to predict rainfall and storm days in regional analyses. We have done hindcasts from 1979 to 2009 using this approach and have found substantially improved skills over the use of dynamical climate models in predicting the East Asian Summer Monsoon rainfall and tropical storm activity."
This study has been published in the Proceedings of the National Academy of Sciences
[ reproduced from ENN, 25 Jan 2013]
Subscribe to:
Posts (Atom)