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Beware of Guerrilla Rain Squalls!

Marianna is currently studying on exchange at a Japanese university. While walking through the park with Daichi, her friend, the sky unexpectedly blackens with dark clouds.

Beware of Guerrilla Rain Squalls!

Daichi

What, it seems that the sky has blackened all of a sudden.

Marianna

Yes, it does. It also seems that the breeze has freshened.

Daichi

Rain is on the way. Let's quickly get inside that shop!

Just as the pair makes it to the shop, there is a pelting downpour of heavy rain.

Daichi

That was a close call. A moment later and we would have been soaked to the skin.

Marianna

Yes, it was lucky that you quickly realized what was happening. What heavy rain. It's almost like a waterfall! Recently there are a lot of evening showers.

Daichi

Rather than just being an evening shower, what you are witnessing is a "guerrilla rain squall".

Marianna

A "guerrilla rain squall"? Well that is an interesting name! It describes things to a tee. It is such an unexpected deluge of rain!

Daichi

Yes, I suppose that is where the name comes from.

Marianna

So what is the difference between evening showers and guerrilla rain squalls?

Daichi

I should point out there is no clearly defined definition to go on, however, when there is a huge deluge of rain that quickly falls within a very defined area, it is referred to as a "guerrilla rain squall". When you have localized heavy rain, water levels in rivers can quickly rise, roads can be put underwater and there is also the danger of water flowing into underground and low-lying areas.

Marianna

That is a scary proposition. So is it easy for guerrilla rain squalls to turn into major disasters?

Daichi

Yes, it is. There is the strong possibility of unexpected accidents occurring. As such, whenever possible, people should quickly move themselves to a safe location and wait there to see out the squall.

Marianna

Yes, trying to move in such heavy rain would be rather dangerous!

Marianna wonders if there is a method by which the timing of guerrilla rain squalls occurring could be understood in advance.

Marianna

So what about if you check the weather forecasts frequently, would it be possible to understand when such guerrilla rain squalls are likely to occur?

Daichi

Even for weather forecasts actually, it seems to be very difficult to predict when and where guerrilla rain squalls might occur. However, with weather forecasts, it is a good idea to be especially careful if they start using phrases and keywords such as "unsettled atmospheric conditions" or "heavy rain, lightning, gusts of wind, tornadoes, hail," etc.

Marianna

I see what you mean. When we were outside a moment ago, all of a sudden there was a freshening of the breeze, and soon after the rain came bucketing down. So is such a freshening breeze a harbinger of guerrilla rain squalls?

Daichi

I believe so. Additionally, there might be a gathering of dark clouds, and you might also hear the rumblings of thunder. Such phenomena are indicators of heavy rain.

Marianna

So, if we become conscious of such indicators, we should react quickly?

Daichi

That is correct. Wait a second; I have just received an email on my smartphone.

Marianna

What sort of email?

Daichi

This is a localized area email that passes on information about disasters and evacuations in the local area, etc. In that guerrilla rain squalls occur in such narrowly defined areas, it's a good idea to receive such email. Also, have a look at this. I would recommend that you bookmark websites like this where you can confirm how much rain has fallen. There are also occasions when warnings and evacuation notifications are issued on such websites as well.

Marianna

If you are prepared, then you don't have to worry. I think I will sign up immediately to receive such emails myself!