Multiple roads were also closed off due to the threat of landslides in the mountainous territory, with authorities issuing the highest “black” rainstorm warning for the first time in two years. And although some bus services resumed Friday afternoon, many routes remain closed or diverted. While most other subway operations remained open, all major bus, tram and ferry services were suspended, according to public broadcaster RTHK. Another video shows workers at a different station up to their knees in water, struggling at the entrance to keep the flooding at bay. ![]() The city’s Mass Transit Railway announced it would suspend services on one of its lines after a station in the Wong Tai Sin district was flooded, with footage shared widely online showing floodwater gushing down the stairs. The government said Friday that such “extreme” conditions were expected to continue until at least midnight. Tyrone Siu/ReutersĪs of Friday afternoon, 119 people have been reported injured from the downpour, four of whom are in serious condition, according to Hong Kong’s Hospital Authority. When he managed to drive home nine hours later, the road was “full of rocks from landslides, debris from trees, abandoned cars and so on,” he said.Ī road blocked due to the debris of a landside after heavy rains, in Hong Kong, on September 8, 2023. He managed to park in a safe place, but there was no way out – leaving him stuck until daybreak. Several other cars had similarly flooded and were “floating” nearby, he said. The flooded roads were “impassable,” he said at one point, “water was coming over the hood of the car and I thought it was going to flood the engine.” Stuart Hargreaves, a Hong Kong resident and professor, was forced to spend the night in his car after being stranded while driving home late Thursday. On Friday, authorities appealed to businesses to allow non-essential employees to stay at home or seek safe shelter, citing unsafe travel conditions. For our CD nozzle, if the flow in the throat is subsonic, the flow downstream of the throat will decelerate and stay subsonic. An increase in the area (dA > 0 ) produces a negative increase (decrease) in the velocity (dV 0). Eighty-six people were injured from the typhoon, the government said.įriday’s deluge again caused widespread transport and business disruptions across the financial hub, with the stock market canceling morning trading, and all schools closed for the day. If the flow is subsonic then (M 1) and the term multiplying the velocity change is positive (1 - M2 > 0). Typhoon Saola, originally a super typhoon, weakened to the equivalent of a Category 2 hurricane as it reached Hong Kong last weekend – but was still potent enough to shut down the city and cause hundreds of flight cancellations. The extreme conditions caught many residents by surprise and came just days after Hong Kong was lashed by its strongest typhoon in five years. Someone else feel free to correct me if I'm wrong, but 1240 fps should keep you supersonic out to around 100 yards.Vehicles submerged in a flooded parking lot in Hong Kong on September 8, 2023. If you look at the basic temperature and don't factor in humidity, altitude, or any other variables, you're looking at a difference in sound speeds like this:Īny colder than that and this Kentucky boy thinks you're crazy for practicing rimfire shooting.įor "sane" or "normal" (like any of us fit those criteria) shooting conditions, 1050 fps will keep you subsonic. This can cause a normally supersonic bullet to travel at subsonic speeds, getting rid of the destabilization that comes from the supersonic-subsonic transition. If there is more humidity, the speed of sound increases. ![]() ![]() Therefore, if the speed of sound is lower than "normal," a subsonic bullet will become supersonic if it's moving faster than sound. If it's cold, the speed of sound is decreased. The speed that sound travels gets slower as air gets more dense. The air gets less dense as the humidity rises. ![]() The air gets more dense as the temperature goes down.
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