Author: Marlene Nqumse
Severe Weather Alert: 17 – 19 December 2019
The Cape Town Weather Office has issued the following severe weather alert:
Hazard: Damaging Winds
Alert Level: Watch
Valid From (SAST): 17/12/19 – 12h00
Valid To (SAST): 19/12/19 – 00h00
WATCH: Gale force (65-75km/h) north-westerly interior winds are expected over the Breede Valley, Laingsburg and Beaufort West municipalities (Western Cape) this afternoon (Tuesday).
ADVISORY: Strong (40-62km/h) north-westerly interior winds are expected over the Breede Valley, Langeberg, Central and Little Karoo (Western Cape) this afternoon (Tuesday), and tomorrow afternoon (Wednesday).
ADVISORY: Strong to gale force (45-70km/h) north-westerly winds are expected along the coastal region from Cape Agulhas and becoming westerly to south-westerly along the south coast spreading to Mossel Bay (Western Cape) during Thursday.
Description: Strong damaging winds
Strong damaging winds often occur along coastal regions, but also often occur during thunderstorm activity. These winds are sudden and can cause much damage.
Precautions: Â Strong damaging winds
Stay indoors where possible away from the windows that open towards the severe winds. Be aware of the following: – sudden cross winds if traveling especially between buildings, fallen trees or power lines and flying debris.
Small boats must stay away from the open sea and seek the shelter of a harbour, river estuary or protected bay.
Parked aircraft should be pointed into the direction of the wind and secured. Listen to the radio or TV for warnings and obey the instructions from disaster management officers.
Description: Dangerous veld/bush fire conditions
Whenever there are prolonged periods of little and no rain coupled with warm dry winds, veldt or bush fires can easily be sparked and will spread rapidly in strong winds.
Precautions: Dangerous veld/bush fire conditions
Don’t make fires in the open and/or leave fires unattended. Don’t throw cigarette butts out of cars or in the open veldt. Don’t throw bottles in the veldt as they can magnify the sun’s rays and start fires. Prepare and maintain fire breaks in controlled manner. In the case of a large fire, report it immediately and move away from the area to let the professionals deal with it. Never throw water onto a fire started by an electrical fault or fires started by oil or paraffin lamps. In this case sand or a blanket should be used to smother the fire. Listen to the radio or TV for warnings and obey the instructions from disaster management officers.
Description: High Discomfort Values
When temperature and the humidity is high at the same time or when the temperature exceeds a certain threshold, human’s ability to cool their bodies through sweating is reduced. This can be a real threat that leads to hyperthermia.
Precautions: High Discomfort Values
Stay indoors in a cool room near a fan if possible. The old and infirm must take extra care to stay hydrated and cool. Avoid strenuous outdoor activity, playing excessive sport and hard labour. Dress in light weight clothes and drink plenty of liquids NOT alcohol. Listen to the radio or TV for warnings and obey the instructions from disaster management officers.
For more information or to report incidents, contact the Garden Route Disaster Management Centre at 044-805 5071.
Update on the Ambient Air Quality Monitoring: October 2019
The Garden Route District Municipality’s (GRDM) Air Quality Management Unit is pleased to announce that the futuristic robotic looking portable ambient air quality monitoring station has returned after repairs at Scentriod in Canada.
The Scentinal SL50 is used by the GRDM’s Air Quality Management Unit for high accuracy screening purposes as well as obtaining baseline information on ambient air quality in a specific air space in the vicinity of proposed new developments. The robot measures all meteorological parameters, Nitrogen Dioxide, Sulphur Dioxide, Carbon Monoxide, Hydrogen Sulphide, Total reduced sulphates and Amines, Methane, Volatile Organic Compounds and Particulate Matter with sizes of 1, 2.5 and 10 micron. The equipment plays a pivotal role in managing air shed and determining the potential accumulative effects in a specific air shed.
The station was recently deployed to the Mossel Bay Harbour in order to obtain baseline information on the ambient air quality in the surrounding area.
The 3rd Generation Air Quality Management Plan (AQMP) was recently adopted during a council meeting. The AQMP identified potential air quality “hotspots” within the seven (7) municipalities in the region, by means of a dispersion modelling which make use of emission factors and mathematically simulate on how air pollutants disperse in the ambient atmosphere. The aim of this study was to identify areas of concerns that exist outside the knowledge of the GRDM’s Air Quality Management Unit.
The possible areas of concern are:
- Bitou: Particulate Matter (PM10)
- Knysna: Nitrogen Dioxide
- George: Particulate Matter (PM10)
- Mossel Bay: Nitrogen Dioxide and odours
- Oudtshoorn: Particulate Matter (PM10), Sulphur Dioxide and Nitrogen Dioxide
Following the identification of the potential areas of concern and pursuing objective 1.5 of the GRDM’s 3rd Generation AQMP, which task the Air Quality Unit to “Initiate and coordinate short-term air quality monitoring projects (where applicable) to verify the dispersion modelling results in potential problem areas”, monitoring will commence in the Knysna, to verify the effect of vehicle emissions in the Main Road of the tourist town.
Subsequent to the Knysna monitoring run, the Scentinal Station will be move to the other areas of concern, namely Bitou and Oudtshoorn. There are continuous emissions monitoring stations in the George-, Mossel Bay- and Oudtshoorn municipal areas, and the focus will therefore be in regions where there is no permanent monitoring site.
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