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pierredv : weather   41

AI for Weather Forecasting – In Retail, Agriculture, Disaster Prediction, and More
"This article will look at how big data and machine learning are transforming weather forecasting and what it means for businesses and governments. In this article we’ll explore:

How companies and government agencies are using AI to improve weather forecasting (including IBM, Panasonic, and the US Government)
Sector-specific machine learning applications for improving business performance (including Retail, Agriculture, Transportation)

Weather forecasting is a strong fit for machine learning. The incredible volume of relevant information — historical data and real-time data — that can be analyzed is simply too great for any group of unaided humans to even begin to process on their own. "

"GE Current has installed smart street lights in several cities that can monitor things like light, humidity, and air quality."

"Panasonic has been working on its own weather forecasting model for years, and it stepped up its effort with the purchase of AirDat in 2013. The company makes TAMDAR, a speciality weather sensor installed on commercial airplanes. "

"According to IBM, 90 percent of crop losses are due to weather events and 25 percent of weather-related crop losses could be prevented by using predictive weather modeling."
TechEmergence  AI  ML  weather  forecasting  IBM  Panasonic  satellite  GE  IoT  NOAA  Monsanto  agriculturevideo 
november 2018 by pierredv
NWS JetStream - Constant Pressure Charts: 500 mb
"Downstream from (ahead of) areas of maximum vorticity are the locations of the greatest rate of increase in vorticity. This implies an area where air converges at the low levels and therefore rises into the atmosphere, possibly leading to precipitation. Conversely, upstream from (behind) areas of vorticity maximum are where greatest rates of decrease in vorticity are located and is where air sinks and diverges (in the lower levels), leading to fair or improving weather."
weather  NWS  charts  pressure  vorticity 
november 2018 by pierredv
South Florida’s Hurricane Building Code is Strong—And North Florida’s Could Be Stronger by Bob Henson | Category 6 | Weather Underground
"Figure 1 (below) shows the 3-second wind gusts used in Florida since 2010 to set the minimum building code that applies to most homes and other structures apart from hospitals and other health care facilities. These values were calculated based on extensive computer modeling and observations, drawing in part on the state’s multiple hurricane landfalls in 2004. They’re designed to represent the highest gusts one would expect to recur at a given point in a typical 700-year period."

Can apply to spectrum statistics: uses combination of "extensive computer modeling and observation"

From Sun Sentinel quote: '' Insurance Journal added: “The shift toward less rigorous codes is driven by several factors, experts say: Rising anti-regulatory sentiment among state officials, and the desire to avoid anything that might hurt home sales and the tax revenue that goes with them. And fierce lobbying from home builders.” ''
Wunderground  risk-assessment  weather  building-codes  interference  statistics 
october 2018 by pierredv
Vorticity - tutorials
Vorticity Basics
Relationship Between Vorticity and Divergence
What is DPVA?
Vorticity Misconceptions
Pressure Troughs and Shortwaves
What is a Shortwave Trough?
What is a Negatively Tilted Trough?
meteorology  weather  tutorial 
september 2018 by pierredv
Probability of precipitation - Wikipedia
According to the U.S. National Weather Service (NWS), POP is the probability of exceedance that more than 0.01 inches (0.25 mm) of precipitation will fall in a single spot, averaged over the forecast area.[1] This can be expressed mathematically:

{\displaystyle {\text{PoP}}=C\times A} [1]
C = the confidence that precipitation will occur somewhere in the forecast area.
A = the percent of the area that will receive measurable precipitation, if it occurs at all.
For instance, if there is a 100% probability of rain covering one half of a city, and a 0% probability of rain on the other half of the city, the POP for the city would be 50%. A 50% chance of a rainstorm covering the entire city would also lead to a POP of 50%. The POP thus usually expresses a combination of degree of confidence and geographic coverage.
weather  statistics  probability 
february 2018 by pierredv
It’s True: Cape Town’s Water Supply Is Three Months Away from a Shutdown by Bob Henson | Category 6 | Weather Underground
"The smaller reservoirs serving the Western Cape Water Supply System rely mainly on winter rains, and they’ve taken a huge hit from the past three years of drought. Complicating the situation further, about half of the system’s water is allocated to agriculture. As in the United States and elsewhere, it can be a political challenge to shift the rural/urban water balance, especially in the midst of a drought crisis."

"And apart from the typical year-to-year ups and downs in rainfall, there’s an ominous trend: a gradual decline in rainfall in the Cape Town area over the last 60 year"

"If Day Zero does arrive, Cape Town residents could face an exhausting set of challenges, even in just getting enough water to stay hydrated and bathed."
weather  Wunderground  South-Africa  CapeTown  drought  agriculture 
january 2018 by pierredv
Metar Tutorial | Weather Underground
cloud cover
FEW (1/8 TO 2/8 cloud coverage),
SCT (SCATTERED, 3/8 TO 4/8 cloud coverage,
BKN (5/8-7/8 coverage), and
OVC (OVERCAST, 8/8 Coverage)
tutorial  weather  Wunderground  METAR  clouds 
may 2017 by pierredv
Mobile-phone expansion could disrupt key weather satellites : Nature News & Comment - Jul 2016
"As Hurricane Patricia barrelled down on Mexico last October, forecasters at the US National Oceanic and Atmospheric Administration (NOAA) grabbed as many ­satellite images as they could to track its progress. But at least one crucial shot failed to download. A 22 October image from the ­Geostationary Operational Environ­mental Satellite (GOES) system showed a black swathe — no data — across most of the Pacific Ocean. . . . The culprit was radio interference from mobile-phone companies. And the problem may soon get worse."
"In a representative sample of GOES imagery taken between May and September 2015, the agency found that 3.6% of the data ­during that stream had been subject to interference. And in May of this year, NOAA clocked 30 events in which satellite transmissions had dropped out, either streaking or nearly obliterating the images. “We consider that to be unacceptable,” Wissman says."
cellular  satellite  weather  weathersatellite  interference  LightSquared  Ligado  NOAA  GOES  NatureJournal 
july 2016 by pierredv
Climate change means the flood defence rule book needs a rewrite - New Scientist - Opinion 16 Jan 2016
"The chaotic behaviour of weather systems makes it impossible to accurately predict rainfall, river flows and the like more than a few weeks in advance. However, hydrologists tend to assume that these variables fluctuate randomly in the long run, which means that their average value, or the probability of exceeding a given threshold, can be estimated accurately from lots of observations. What’s more, these results do not change over time – a property known as “stationarity”– and so form the basis of flood defence plans."

But some hydrologists are saying that climate change => stationarity is dead.
NewScientist  opinion  climate-change  modeling  statistics  weather 
march 2016 by pierredv
Windmap; an animated map of global wind - YouTube - Cameron Beccario
Via John Helm: the guy that wrote the nullschool wind map gives a conference talk about how he developed it "Cameron Beccario (@cambecc) talks about designing http://earth.nullschool.net/ which is an animated map of global wind and weather. Cameron spoke at The Graphical Web 2014 conference (http://www.graphicalweb.org/2014/) at The University of Winchester as organised by The Office for National Statistics."
weather  maps  softwaredevelopment  video  wind  lectures 
november 2015 by pierredv
How eight microsatellites could improve hurricane forecasts - CSMonitor.com
"The suitcase-sized satellites began moving off assembly tables earlier this month and are designed to estimate wind speeds in the core of a hurricane." "The craft are designed to use global-positioning-satellite signals, reflected off the sea surface, to measure surface roughness. Roughness is a surrogate for direct wind measurements."
CSMonitor  cubesates  microsatellites  weather  weathersatellite  GPS  CYGNSS 
october 2015 by pierredv
Adrift on Vimeo
"It has been almost 3 years since I released "The Unseen Sea" and I'm excited and proud to share with you my latest project "Adrift". "Adrift" is a love letter to the fog of the San Francisco Bay Area. I chased it for over two years to capture the magical interaction between the soft mist, the ridges of the California coast and the iconic Golden Gate Bridge. This is where “Adrift” was born."
ex  Vimeo  fog  timelapse  weather  san  francisco  video 
july 2013 by pierredv
UK weather forecaster worries about interference from SRDs — PolicyTracker: the spectrum management newsletter
"The UK's official weather forecaster, the Met Office, has warned that plans to free up spectrum for short-range devices such as smart meters could cause serious interference problems with some of its forecasting equipment. The regulator is proposing that all the spectrum be released, on a licence-exempt basis, for short-range devices (SRDs) and radio-frequency identification (RFID). The only fly in the ointment is the Met Office, which operates two Doppler Wind Profiling Radars (WPRs) in the 915-917 MHz band being released by the MoD. Because the Met Office is not convinced either Ofcom’s or CEPT’s proposals will provide protection for its existing WPRs, let alone for any new ones, it is rejecting the licence-exempt model and requesting “some form of licensing regime”."
unlicensed  weather  radar  interference  radar  PolicyTracker  Ofcom  SRD 
may 2013 by pierredv
Wind Map
via Christopher Ireland
*  weather  design  wind  visualization 
october 2012 by pierredv
Potential L-Band Frequency Sharing - National Weather Service - EMWIN
"Of special interest to EMWIN users and vendors is FCC Public Notice DA-1035 (ET Docket No. 10-123) released on June 4, 2010 calling for public comment on the extent and manner of use of the 1675-1710 MHz frequency band by non-federal users"
wireless  FCC  NOAA  spectrum-sharing  weather 
august 2011 by pierredv
OET PN: Request for information on use of 1675-1710 MHz, ET 10-123
NTIA has preliminarily identified the 1675-1710 MHz band for use to meet 500MHz mandate of NBP; the 1675-1710 MHz band is allocated on a co-primary basis for federal and non-federal use for the Meteorological Aids Service and the Meteorological Satellite Service (Space-to-earth).
FCCDocket10-123  FCC  NOAA  satellite  weather  filetype:doc  media:document 
august 2011 by pierredv
Receiving weather satellite images
"For best results, you need to use a receiver developed specifically for the reception of weather satellites, which has the correct IF bandwidth. I use an R2FX APT receiver. Unfortunately this receiver, designed and made in Germany where the problem of close-by pager signals does not exist, suffers from desensitization and cross-modulation when the pager transmitters operate. This results in received images that are scarred with ugly interference bands. Receivers made in the UK by companies like Timestep and Dartcom are reputedly better, but unfortunately they are a lot more expensive."
satellite  radio  receiver  weather  interference  RF  Examples 
july 2011 by pierredv
WeatherSpark | Interactive Weather Charts
WeatherSpark is a new type of weather website, with interactive weather graphs that allow you to pan and zoom through the entire history of any weather station on earth.
weather  visualization  web2.0  climate 
may 2011 by pierredv
People's misperceptions cloud their understanding of rainy weather forecasts = uweek.org |
"people don't understand what the 20 percent chance of rain actually refers to. Many people think it means that it will rain over 20 percent of the area covered by the forecast or for 20 percent of the time period covered by the forecast, said Susan Joslyn, a UW cognitive psychologist and senior lecturer"
"When a forecast says there is 20 percent chance of rain tomorrow it actually means it will rain on 20 percent of the days with exactly the same atmospheric conditions," she said
uw  weather  psychology  cognition  ** 
may 2009 by pierredv
CloudStatus® Powered by Hyperic
a weather report on the current state of Amazon's and Google's cloud-computing services
via:gmsv  weather  web2.0 
august 2008 by pierredv

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