Monthly Archives: June 2011

WEATHER REPORT FROM: Secunda Weather 30/06/11 12:00:15

Conditions: Dry
Temperature: 19.6 ?C
Trend: +1.7 ?C /hr
Average windspeed: 14.6 kmh
Current speed: 27.4 kmh
Direction: WNW 281 ?
Barometer: 1024.1 hPa (1024.1 hPa )
Pressure trend -0.3 hPa/hr
Humidity: 16 %
Dew point: -6.9 ?C
Todays rain: 0.0 mm
Monthly rain: 6.5 mm
Yearly rain: 289.8 mm
Maximum temperature: 19.7 ?C at time: 11:50 AM
Minimum temperature: 5.1 ?C at time: 7:09 AM
Maximum gust today: 27.4 kmh W at time: 11:59 AM
Current Heatindex: 21.3 ?C
Indoor temp.: 14.5 ?C
Indoor hum.: 34 %
Solar radiation: 550.0 w/m2
UV: 5.5
Sunshine hours for year: 1020.3
Sunshine hours for month: 132.1
Sunshine hours for day: 2.3
Created by “Weather Display” version 10.37P build 08 17:31:00 2011/06/29
Time of Weather report: 12:00:15 Date of report: 30/06/11

Disclaimer is not a professional weather prediction & seismology service. Never use the information on this web-page to predict weather. We advise the public to contact the SA Weather Service for weather predictions and official weather warnings.

Seismic event detected: source unknown

A seismic event was detected today, at 13:53 SAST. The frequency content contains mostly higher frequencies, so it seems to be a local/close by event.

It shows some similarity to a previous Augrabies event, maybe someone from that area can confirm/assist with info?

The seismogram:


Seismogram: SecundaWeather/20110629/1135

Unusual seismic signals: 23 June 2011

On 23 June the seismogram showed a signal pattern that I have not yet seen on my seismometer. The frequency spectrum plots showed a lot of energy around 7 Hz, which indicates that microseisms may be the source.

I had a look at the Tsumeb (Namibia) seismogram, and it showed the same signal signature.

Below are seismograms from my station and the Tsumeb station. The period of interest is between 13:00 on the 23rd to about 02:00 on the 24rth. Just after that the 7.2 M quake close to Alaska was recorded.

The signal pattern prior to 10:00 is typical for periods with strong wind, and for some reason that stopped while the new signal pattern started.

Can it be that the approaching cold front and huge sea wave crest heights recorded caused an increase in microseismic activity?



Satellite image: 20110626

NOAA 18 Northbound 79° E on 137.9125MHz, Thermal Enhancement, Normal Projection, Channel A: 1 (Visible), Channel B: 4 (Thermal Infrared)

Current conditions


Record windrun today!

Maximum Temperature 11.7°C at 2:04 PM
Windrun today 306.39 km
Minimum Temperature 0.1°C at 5:46 AM
Maximum Gust (last hour) 27.6 kmh NW at 11:34PM

The windrun figure is an all time record for this station.

Weather report: 2011/06/25 07:00

Current Temperature 0.5°C
Wind Direction W (270 °)
Windspeed 13.7 km/h
Current temp conditions
Wind chill -3.5°C
Heat index 0.5°C
Apparent solar temp -3.8°C
Temp change +0.3°C/hour
Maximum Temperature (since midnight 2.7°C at 12:00 AM
Minimum Temperature (since midnight) 0.1°C at 5:46 AM
Humidity 71% Dewpoint -4.2°C (Wet Bulb: -1.1°C)
Barometer (corrected to MSL) 1021.3 hpa
Pressure change (last 12 hours) -0.1 hPa



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