Up to his waist in moving, misty map, he gestured. The whole picture humped up a little and moved away sideways, first to show a curve of heaving gray ocean, ribbed like a tabby cat with strips of whitish cloud, and then, giddily, going the other way to show green-brown views of the Low Countries and the French kingdoms and more stripes of cloud there.

“Hmm,” my father said again. “Not as bad as I feared. Everything is setting northward, but only very slowly. I shall have to speed things up.”

He set to work, rather as a baker might roll dough along a board, pushing and kneading at clumps of cloud, steering ocean wisps with the flat of his hands, and shoving mightily at the weathers over Ireland and Wales. The dimness over Wales broke apart a little to show more green, but it didn’t move away. My father surveyed it with one hand to his chin.

“Sorry, everyone,” he said. “The only way with this is a well-placed wind.”

We watched him moving around, sometimes up to his shoulders in land and cloud, creating winds. Most of them he made by blowing more or less softly, or even just opening his mouth and breathing, and they were never quite where you thought they ought to be. “It’s a little like sailing a boat,” he explained, seeing Grundo frowning. “The wind has to come sideways onto the canvas to make a boat move, and it’s the same here, except that weather always comes in swirls, so I have to be careful to set up a lighter breeze going the opposite way. There.” He set everything moving with a sharp breath that was almost a whistle and stood back out of the table to time it.

After a few minutes of looking from his big, complicated watch to the movements on the table, he walked away and picked up his robe. Weather working is harder than it looks. Dad’s face was streaming with sweat, and he was panting slightly as he fetched his portable far-speaker out of a pocket in the robe. He thought a moment, to remember that day’s codes, and punched in the one for the Waymaster Royal’s office.

“Daniel Hyde here,” he told the official who answered. “The rain will stop at twelve-oh-two, but I can’t promise any sunlight until one o’clock.... Yes … Almost exactly, but it couldn’t be done without a wind, I’m afraid. Warn His Majesty that there may be half a gale blowing between eleven-thirty and midday. It’ll drop to a light wind around half past.... Yes, we should have fine weather for some days after this.”

He put the speaker away and smiled at us while he put on his robe. “Fancy a visit to the Petty Viands bus?” he asked. “I could do with a cup of something hot and maybe a sticky cake or two.”