We have entered the micro-season of “Thunder Lowers Its Voice”. This is the first micro-season of the mini-season of Autumn Equinox. The micro-seasons within Autumn Equinox are:
- Thunder Lowers Its Voice (Sep 22 – Sep 27)
- Hibernating Creatures Close Their Doors (Sep 28 – Oct 02)
- The Paddy Water is First Drained (Oct 03 – Oct 07)
These seasons were established in 1685 by Japanese astronomer Shibuka Shunkai and are specific to Japan. However, just because the calendar focuses on Japan doesn’t mean it isn’t applicable to others. No matter where you live you can use these seasons as a starting point for your personal exploration of the world around you.
As a way to celebrate this season, we will investigate the conditions needed to create thunder and lightning. Then we read some thunder and lightning-themed haiku by Basho, Issa, and Kerouac.
“Thunder Lowers Its Voice” (Sep 22 -Sep 27) is a counter-season to “Thunder Raises Its Voice” (Mar 30 – Apr 03). These two micro-seasons indicate distinct shifts in environmental temperatures. These shifts are associated with the cooling and warming that occurs as a result of the earth’s movement around the sun and are marked by the equinoxes.
This year, in the northern hemisphere, the autumn equinox occurred on Thursday, September 22, 2022. An equinox marks the time when the length of the day equals the length of the night.
After the autumn equinox, the days begin to get shorter and the temperatures in the northern hemisphere begin to cool. The reason for these seasonal changes is a result of the earth’s 23.5-degree tilt. The tilt places the northern hemisphere farther away from the sun in the winter months and closer in the summer. The graphic below from the National Weather Service illustrates this process.
What is Thunder?
Thunder is the sound that accompanies lightning. Thunder is most common in thunderstorms which are rainstorms that have rain, thunder, and lightning. Thunder can either be a low rumbling noise or a more abrupt sound sometimes called a thunderclap.
How Are Thunderstorms Formed?
When a warm air mass settles under a cold air mass, the combined air mass is called “unstable”.
A “stable” air mass is one where the cold air lies under the warm air. This type of air mass is called “stable” because cold air is denser than warm air and prefers to settle closer to the earth’s surface.(2)
.A thunderstorm is created when warm moist air rises and comes in contact with colder air in the upper atmosphere. These conditions exist when there is an “unstable” air mass.
Updrafts and Downdrafts
When the warm moist air rises to meet the colder air, the water vapor in the air begins to condense and creates a cloud. As the warm air continues to rise, it creates a cloud formation that is known as a towering cumulus cloud.
As the towering cumulus cloud continues to grow, it will eventually reach a high enough altitude that the warm air updrafts flatten out and create an anvil-like shaped cloud that is known as cumulonimbus incus.(3) At this time, water vapor has frozen in the cloud’s upper reaches and begins to fall back to earth. As the ice falls, it thaws and becomes rain. The falling rain then creates a downdraft.
The rising and falling of water molecules in the cloud create a static electric charge within the cloud. When the cloud’s negative charge reaches its maximum limit, it looks for a place to discharge. The earth’s surface offers a great discharge point. When the negatively charged clouds release their energy, we see a lightning flash.
When lightning is created, it rapidly heats the atmosphere which creates the initial crack of thunder. The following rumble of thunder is created as the atmosphere cools.(4)
Why Does The Thunder Lower Its Voice?
Once we reach autumn, the likelihood of thunderstorms decreases. Part of the reason for this is that unstable air masses are less likely to develop in the cooler months.
The opposite is true in the micro-season of “Thunder Raises its Voice” which happens in late spring. At this time the earth is beginning to warm up and there is more opportunity for unstable air masses and more moisture in the air.
Thunder and lightning have the potential to be multi-season kigo according to the World Kigo Database. However, “thunder” without another seasonal descriptor is considered a summer kigo, and “lightning” without a specific seasonal descriptor is an autumn kigo.(5) With this in mind, let’s read a few haiku about “thunder” and “lightning”
How admirable! to see lightning and not think life is fleeting. (Translated by Robert Hass)
lightning— into the darkness a night-heron's cry. (Translated by David Landis Barnhill)
Yellow rose petals thunder – a waterfall. (Translated by Lucien Stryk)
hey there, mountain charred by lightning, it's autumn rain (Translated by Chris Drake)
in the lightning how he laughs... Buddha! (Translated by David Lanoue)
Drunk as a hoot owl writing letters By thunderstorm
A bubble, a shadow - woop - The lightning flash
A Haiku Invitation
This week’s haiku invitation is to write a haiku or senryu that references Thunder or Lighting. Try and keep in mind thunder and lightning’s default seasons. Consider using other seasonal descriptors if you choose to place these elements in other seasons.
Share your haiku in the comments below, or post on your own page and link back to this post. I can’t wait to read what you write!
- “The Seasons, the Equinox, and the Solstices”; National Weather Service
- Highs and Lows/High and Low Air Flow: Iowa State University
- “Thunderstorms”: Wikipedia
- “What Causes Lightning and Thunder?”; SciJinks NOAA
- “Thunder and Lightning”; Dr. Gabi Greve (WKD)
Basho’s haiku were retrieved from “Matsuo Bashō’s haiku poems in romanized Japanese with English translations” Editor: Gábor Terebess. Issa’s haiku were retrieved from “Thunder and Lightning”; Dr. Gabi Greve (WKD). Jack Kerouac’s haiku were retrieved from “Jack Kerouac Collected Haikus”; Terebess Asia Online
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Thanks Mark for another really interesting informative post. I love the selection of haiku that you have shared.
Hi Goff, Thanks for the comment! I am glad that you enjoyed this one. Thunder and lightning seem to be very popular subjects in haiku!
Pleasure Mark. Stay Safe. Stay Smiling.
Hi Mark. Here is my response to this week’s prompt Thunder or Lightning.
Happy Friday Everyone.
Hi Goff, Thank you for participating. I always enjoy a good squirrel haiku, although I have yet been able to write a good one. I seriously have a couple ones in my notebook that I can’t seem to do anything with. Thanks again and I hope you have a great weekend.
Cheers. Happy Squirrel Saturday Hy Friend.
So beautiful explanation with thunderstorms and rain 🌧 Malaysia always happening this Micro-Season 🌷🙏♥️🌷
Hi Thattamma, Yes! You seem to share photos of rain and thunder frequently. You bring up a very good point about how your location relative to the equator might really change things for you. Thanks for sharing and I hope you have a good weekend.
Most welcome and thank you too 🌹🙏 Have a lovely weekend 👍🏼👏🏼
afternoon rain storm
thunder rumbles overhead
Jinx shelters in place
Very nice! Thanks for writing and sharing your work. Have a good weekend!
Thank you for including the Kerouac. I always enjoy Kerouac, and what a great way to begin the day.
I am glad that you enjoyed the haiku selection. I have really become a fan of Kerouac’s haiku also. Have a great weekend and thanks for the comment!
In Eastern Washington where I grew up we would get really beautiful lightening storms. You could watch them roll in and out of the valley. In Western Washington where I now live we typically only get the occasional thunderclap. Just one loud boom to scare the crap out of you and its gone. It’s really rude of nature to do so, in my opinion. Ha,ha,ha.
That is too funny! I don’t think I have ever heard someone call nature rude before. But I get that. I hope all is well on west coast!
Great as always, here is my haiku https://poetisatinta.wordpress.com/2022/09/26/thunder-lowers-its-voice/
Hi I may have jumped in too quickly with this one 🙂
Great couple of haiku! Thanks for writing and sharing on both of these seasons! I really enjoy reading your work.
Excellent post, beautifully written. I love your description of how thunderstorms occur and all the scientific terms, especially cumulonimbus incus! 🙂 And Kerouac’s haikus – brilliant.
Hi Sunra, I am fascinated by the weather so these topics are really enjoyable for me. Kerouac has some really fun haiku. This one drunk as an owl is one that I particularly enjoy. Thanks again for the support! Have a good weekend.
You’re most welcome! Wishing you a great weekend too 🙂
Every once in a while, we actually get thunder in the winter. It’s weird, and the first response is to doubt the senses.
It is strange when this happens. I actually can’t remember the last time I heard thunder in the winter. But I’m sure I have.
Only in the last couple years have I noticed it, but it’s not common. Maybe it has to do with climate change??