Current Radar or Satellite Image

Flhurricane.com - Central Florida Hurricane CenterHurricanes Without the Hype! Since 1995


2017 Atlantic Hurricane Season officially over. 2018's runs June 1st-Nov 30th, 2018.
Days since last H. Landfall - US: Any 64 (Nate) , Major: 82 (Maria) Florida - Any: 92 (Irma) Major: 92 (Irma)
None
COMMUNICATION
STORM DATA
CONTENT
FOLLOW US
ADS
Login to remove ads

 


General Discussion >> Hurricane Ask/Tell

Jump to first unread post. Pages: 1
srquirrely
Weather Watcher


Reged: Sat
Posts: 32
Loc: SARASOTA 27.27N 82.53W
Weather MODIFICATION / Tornado Season ??
      #90192 - Wed Apr 13 2011 03:18 PM

Is anyone here familiar with 'dutchsinse' on YouTube???
I would really like to get an educated (and open minded) opinion of his theory from someone who understands HAARP and 'scalar wave technology'.
Here is a link to one of his most recent videos: YouTube - dutchsinse's Channel
What do you think ??

tia, SRQ


Post Extras: Print Post   Remind Me!   Notify Moderator  
Ed DunhamAdministrator
Former Meteorologist & CFHC Forum Moderator (Ed Passed Away on May 14, 2017)


Reged: Sun
Posts: 2565
Loc: Melbourne, FL
Re: Weather MODIFICATION / Tornado Season ?? [Re: srquirrely]
      #90193 - Wed Apr 13 2011 11:29 PM

In the video, the narrator talks about using the ground-based NEXRAD (WSR-88D & WSR-98D) weather radar network operating at different frequencies to manipulate the weather. That statement is not correct, the NEXRAD radars are all S-Band radars operating at a 10cm wavelength. A 10cm S-Band radar is much better than the older weather radars, many of which operated at C-Band (5cm), because the S-Band frequency is not influenced all that much by attenuation caused by heavy rainfall, but the C-Band signal is often unable to penetrate heavy rain. There is no 'conspiracy theory' here to modify the weather - the WSR radars all operate at essentially the same frequency. The transmitter operates within a narrow frequency range of 2.7 to 3.0 GHz. (Note that I helped to develop the NEXRAD radar while working for Raytheon Company in the 1980s.)

I'm not knocking his theories or technologies, but his 'statements of fact' with regard to the radar network are incorrect so the assumptions that he presents are also incorrect.
ED


Post Extras: Print Post   Remind Me!   Notify Moderator  
srquirrely
Weather Watcher


Reged: Sat
Posts: 32
Loc: SARASOTA 27.27N 82.53W
Re: Weather MODIFICATION / Tornado Season ?? [Re: Ed Dunham]
      #90194 - Fri Apr 15 2011 12:59 AM

Here's dutchsinse's follow-up video to the one I posted a link for yesterday: YouTube - dutchsinse's Channel , if anyone's interested in 'the rest of the story'. (There's about 40 hours elapsed time between them.)

ED - thanks for taking the time to watch and respond, and for the quick NEXRAD lesson. I think, though, that he was referring to NEXRAD sites being used for operating other technology, namely "HAARP" (at extremely high and ultra low frequencies), which causes its own circular signature to appear as aberrant radar returns.

I'm guessing that a lot of the oddities he notes in composite radar loops have more to do with this "NOTE: Radar data is susceptible to a phenomena called anomalous propagation. This generally happens at night and appears as an area of 20 dBZ echos centered around each radar site and expands with time. To reduce the problem, low echo values near the radar sites have been removed" than with any conspiracy to modify the weather. But the other element he concerns himself with - scalar waves - are completely beyond my ability to comprehend. There are definitely some inexplicable straight-line phenomena being picked up.

If anyone is curious enough to watch the videos and help me out here I'd appreciate it. I'm sure there's some forum it could be discussed in, even if it's 'bad jokes'.

srq


Post Extras: Print Post   Remind Me!   Notify Moderator  
Ed DunhamAdministrator
Former Meteorologist & CFHC Forum Moderator (Ed Passed Away on May 14, 2017)


Reged: Sun
Posts: 2565
Loc: Melbourne, FL
Re: Weather MODIFICATION / Tornado Season ?? [Re: srquirrely]
      #90195 - Sat Apr 16 2011 12:51 AM

I'll start with a little more on weather radars from Newsweek.com:
"Ground Clutter, Anomalous Propagation, and Other False Echoes

Echoes from objects like buildings and hills appear in almost all radar reflectivity images. This "ground clutter" generally appears within a radius of 25 miles of the radar as a roughly circular region with a random pattern. An mathematical algorithm can be applied to the radar data to remove echoes where the echo intensity changes rapidly in an unrealistic fashion. These "No Clutter" images are available on the web site. Use these images with caution; ground clutter removal techniques can remove some real echoes, too.

Under highly stable atmospheric conditions (typically on calm, clear nights), the radar beam can be refracted almost directly into the ground at some distance from the radar, resulting in an area of intense-looking echoes. This "anomalous propagation " phenomenon (commonly known as AP) is much less common than ground clutter. Certain sites situated at low elevations on coastlines regularly detect "sea return", a phenomenon similar to ground clutter except that the echoes come from ocean waves.

Radar returns from birds, insects, and aircraft are also rather common. Echoes from migrating birds regularly appear during nighttime hours between late February and late May, and again from August through early November. Return from insects is sometimes apparent during July and August. The apparent intensity and areal coverage of these features is partly dependent on radio propagation conditions, but they usually appear within 30 miles of the radar and produce reflectivities of <30 dBZ.

However, during the peaks of the bird migration seasons, in April and early September, extensive areas of the south-central U.S. may be covered by such echoes. Finally, aircraft often appear as "point targets" far from the radar."

Regarding HAARP and composite reflectivity circular echoes and 'other technologies' at NEXRAD sites: The radar operates under operator selected 'Scan Strategies'. A couple of the strategies are available when operating the radar in Precipitation Mode and another strategy is available for operating the radar in Clear Air Mode. Each Scan Strategy has a specified number of fixed elevation angles that the radar rotates through to complete what is called a Volumn Scan. When an elevation sweep at any of the set elevation angles detects clouds or weather (when scanning in Precipitation Mode) an echo return is sent back to the radar. Three types of echo return data are processed by the Radar Data Acquisition unit, i.e., reflectivity (moment 0), radial velocity (moment 1) and spectrum width (moment 2). All three types of data can provide useful information to the Radar Meteorologist (note that level 10 spectrum width is an excellent severe thunderstorm/tornado signature). Composite reflectivity is an image created by the Radar Product Generator (RPG) software that contains all of the reflectivity returns for all of the elevation angles in a single Volume Scan with display preference given to the highest reflectivity detected over each point within the Volume Scan along all azimuths and distances (its actually a little more complex than that, but I've kept it simple for ease in understanding - I know, easy for me to say ).

Okay, with that long preamble, lets take a weather situation where there is an extratropical cyclone with thick clouds and rain at the surface and colder temperatures below freezing aloft and this weather is extensive in its horizontal coverage and is occuring over the radar site. Assume a Precipitation Mode Scan Strategy with nine elevation angles ranging from 0.5 degrees to 16 degrees. The reflectivity return from the lowest 0.5 elevation angle shows returns for light to moderate rain extending from near the radar site out to some considerable distance from the radar (remembering that because of the curvature of the earth, the distant returns are from clouds and weather that is a lot higher in the atmosphere than the returns that are very close to the radar site). At a point quite some distance from the radar at this low evevation angle there is a sudden sharp ring of higher reflectivity that forms a full circle, with lower reflectivities both inward and outward from the circle. The next higher elevation scan has an echo return that is quite similar except that because the elevation angle is higher the circle of higher reflectivity is a little closer in toward the radar site. This process will repeat with all nine elevation angles and whan the RPG develops the Composite Reflectivity product the image will have nine circles around the radar. Each of those bright reflectivity circles represents the altitude of the freezing level (or melting level) for that particular elevation angle. Melting snow causes an uncommonly high reflectivity return. The first time that we saw this at Raytheon when we were starting our radar tests we were certain that there was something wrong with the radar - until we figured out what it was.

I guess the short version of the story is that no mysterious new technology is causing erroneous circular radar returns that point toward weather modification. In fact, if such a technology was in use, it would likely interfere with the NEXRAD signal itself. A few of the NEXRAD sites are operated by Air Force Weather personnel, but most of them are National Weather Service operated sites - I've been to both AF and NWS sites and they generally all operate in the same manner. Also note that the radar will pick up a straight-line return along a specific azimuth (or two) - it picks up the sun at sunrise and sunset.

Hope that at least some of this helps.
Cheers,
ED


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1



Extra information
0 registered and 7 anonymous users are browsing this forum.

Moderator:  CFHC, Ed Dunham, Colleen A., danielw, Clark, RedingtonBeachGuy, Bloodstar, tpratch, typhoon_tip, cieldumort 

Print Topic

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled

Rating:
Topic views: 5290

Rate this topic

Jump to

Note: This is NOT an official page. It is run by weather hobbyists and should not be used as a replacement for official sources. 
CFHC's main servers are currently located at
Hostdime.com in Orlando, FL.
Image Server Network thanks to Mike Potts and Amazon Web Services. If you have static file hosting space that allows dns aliasing contact us to help out! Some Maps Provided by:
Great thanks to all who donated and everyone who uses the site as well. Site designed for 800x600+ resolution
When in doubt, take the word of the National Hurricane Center