You are currently browsing the monthly archive for August 2009.

For science and weather lovers especially, the internet is a fabulous resource for experiencing the world in ways one doesn’t ordinarily get to do. The video below shows the cloud deck in the sky behaving just like waves on a lake, the ordinary daily cycle, that because of the time scale, we don’t ordinarily “see”. Gravity waves are the waves in a fluid that occur as the fluid tries to seek a uniform plane – ie, gravity pulls the peaks down. Its the same effect that occurs on a lake after the wind has stopped blowing, or when you throw a rock into a pond.

Our atmosphere behaves the same way as its pushed around under the many things that influence it.

This video was picked up from WUWT in a thread about cloud phenomena. Have a look and follow some of the commenter’s links. Wonder beckons.


An interesting time lapse video from Peggy’s Cove webcam in Nova Scotia, with battering wave action against the Peggy’s Cove lighthouse. Covers about 2 hours around noon when wind strength was highest.

The image below represents an EWR radar picture of the August 20, 2009 storm line that spawned the tornados that hit the town of Vaughan north of Toronto, the town of Durham, and areas of Milton. In Vaughan, as many as 180 homes were damaged, some beyond repair. In Durham, a 12 year old child was killed by debris.

EWR tracked a pair of mesocyclones (not visible in this animation) over the Vaughan area, and a confluence of cells over the Milton area the evening of the storms.

Update 2009/08/24: Animation fixed. The first thumbnail below is the animation tracking the storm line across southern Ontario. The second thumbnail is the smoothed Base Reflectivity scan of the line at the time of peak activity over Vaughan (7:03 PM 2303 UTC).

Unfortunately, I only collected the Base Reflectivity data at the time, not expecting the outcome to be as significant. The animation consists of over a 100 individual radar frames, each of which is available as a separate image.


Donations welcome!

RSS Last Alert Issued:

  • GH-GTA Scan Zone Severe Weather Alert #ONStorm October 2, 2016
    SEVERE WEATHER ALERT — 01:35 PM EDT Oct 02 2016 This is an automated alert of potentially severe weather for the Golden Horseshoe/ Greater Toronto/Niagara Peninsula/South-Central Ontario Monitored Area, from Ephemerata Weather Radar. See attached scan image. The alert triggered at 01:35 PM EDT on Oct 02 2016, from radar data analyzed from NWS radar site KBUF […]

The Radar Page

S. Ontario Warnings

Click for current EC Warnings Map

Ephemerata Weather Radar
Standard: - display: active rain scan: Buffalo, Cleveland or Detroit short or Long range base or composite reflectivity. When the GH-GTA is quiet, other areas may be spotlighted.

Alerts Archive

EWR on twitter

Ephemerata Home

EWR Image Gallery

EWR Image Gallery Miscellaneous images taken from the various EWR focus topics.

Solar/Climate Conditions


EWRadarProject on Youtube

Copyright Notice

All material, text, images, graphics and video, is ©2013 P. Coppin. All Rights Reserved. No reproduction by any means is permitted without explicit authorization.