13 December 2021 Impact Based Weather Warnings for Western Cape and Namaqua: Yellow level 1: Severe Thunderstorms
13 December 2021
Impact Based Weather Warnings for Western Cape and Namaqua: Yellow level 1: Severe Thunderstorms
Please find included the Impact Based Warning for the Western Cape and Namaqua Region of Northern Cape
Legal notice:
“This warning from SA Weather Service must be communicated as received and may not be altered under any circumstance.
It must be forwarded or communicated in its entirety and no portion hereof may be replicated or copied and distributed.”
| Hazard | Alert Level | Affected Municipalities | Valid From (SAST) | Valid To (SAST) |
| Severe Thunderstorms | Yellow(L1) (Medium likelihood of Minor Impacts) |
Hessequa, Mossel Bay, Swellendam | 13/12/21 10h00 | 13/12/21 15h00 |
Discussion: Showers and thundershowers are expected to develop over the southern and eastern parts of the Western Cape today where generally 10-25mm can be expected. However, there are a possibility of one or two of these thunderstorms to become severe for the Swellendam, Hessequa and Mossel Bay municipalities leading to pockets of heavy downpours (40-50mm in an hour) leading to flash flooding. Large amounts of small hail may also occur in pockets.
Impact: Localised areas of flash flooding of susceptible roads and low-lying areas along with localised damage to infrastructure and settlements (mainly informal) may occur. Very isolated events of a large amount of small hail are expected over an open area that can cause damage to livelihood and livestock.
Instruction: If possible stay indoors away from metal objects. Do not seek shelter under trees or tall objects. Do not go fishing or play golf as both the golf clubs and fishing rods are good conductor of electricity. Be aware that any combination of hail, strong winds and/or heavy downpours can accompany the storms.
SOUTH AFRICAN WEATHER SERVICE
Cape Town Weather Office
2nd Floor: Oval Office Park
Cape Town Int airport
Freight Road
Matroosfontein
Cape Town