The Wet Bulb and Babadook: Big Birthday Bash 2026

The forecast came in and I did the thing I always do, which is not read it like a runner but read it like the person I became instead of a runner. I pulled it into a script. I differenced the rainfall column because it was cumulative and cumulative numbers lie to you about rate. I computed wet-bulb temperature because air temperature is a story the sky tells to make you feel better, and I have spent a decade learning not to trust the surface of anything.

Here is what the surface says: twenty-six, twenty-seven degrees. Warm. Manageable. A nice day.

Here is what is underneath: the wet-bulb sits at twenty-five, twenty-six degrees the entire way. Dawn. Midnight. The small cold hours that are supposed to hand you back some relief. It does not drop. It does not blink. The dewpoint never falls below about twenty-five, which is a poetic little horror if you think about it, because it means the air is already so full of water that it has nothing left to take from me. And taking from me is the whole point. Sweat only cools you when it leaves. When the air is this saturated it just sits on your skin like an apology.

I study gradients for a living. Density gradients, temperature gradients, the slow invisible overturning of an ocean that decides what the whole planet’s climate gets to be. My entire professional existence is the belief that the difference between two things is where all the interesting physics lives. And the monsoon, cheerfully, has erased the one gradient I actually need out there. The vapour pressure gradient between my skin and the air. Gone. Flattened. The atmosphere has decided, for four days, to hold still.

So. Uncompensable heat stress. That is the term. It does not mean I cook. The apocalypse wet-bulb, the thirty-five-degree one that kills you sitting still in the shade, that is nowhere near. This is the quieter version. My core temperature will not sit in a nice steady state. It will drift. Slowly, over hours, upward, because I can shed heat but not quite as fast as I make it. And the thing about a slow drift is you do not feel the moment it becomes a problem. You just look up at hour thirty and realise you have been making bad decisions for a while and calling them strategy.

Hour thirty.

Let us talk about hour thirty, because the forecast and I had a genuinely unpleasant conversation about it. The two afternoons where the cloud thins out and the sun loads the radiant heat back on, one of them lands almost exactly where I have always come apart. Not the legs. The legs are honest. The legs tell you the truth and you can negotiate with them. It is the other room. Room 101. The one where it is just me and the inside of my own head and no Vishwas in sight and the Babadook has let himself in and put the kettle on.

Here is the part I did not want to write down and am writing down anyway. The heat and the Babadook are not two separate events with a polite gap between them. Hyperthermia degrades mood and judgement before it degrades muscle. That is not me being dramatic, that is the physiology, it is in the literature, the executive function goes soft while the quads are still fine. Which means my thermoregulatory system is going to hand shame a loudspeaker at precisely the hour shame likes to show up anyway. The 2012 DNF at a hundred and fifty. The 2013 one at two hundred and four. Those two ghosts have a standing invitation, and the weather just told me it is going to prop the door open for them.

Good to know. Genuinely. Better to know it now, tonight, dry, than to discover it out there and think it means something about me.

Because it does not. It means the wet-bulb is twenty-six. That is all it means.

The rest of the notes, in the order I will need them:

• Day one is not the enemy.
  Only about ten millimetres of rain across the whole of the eighteenth, steady monsoon drizzle, nothing biblical. IMD is calling this a subdued spell over Madhya Maharashtra, below normal for the week, and my little point forecast agrees with them, which is reassuring in the way it is reassuring when two instruments you don’t fully trust happen to agree. The rain gets serious after the twentieth. Which means: the slower I go, the worse the weather I run into. There is no banking time out there. The clock is not my friend and neither is the ego that wants to prove something on the first climb. Front-load the effort into the cool cloudy dark. Walk the sunny afternoons on purpose. Walking the afternoon is not the Babadook winning. Running the afternoon is how a 283 becomes a DNF at 200 with better production values.
• The Ghats will be wetter than the number says.
  The low-level jet is screaming southwesterly at forty-five knots and my forecast is one grid cell that does not know what a mountain does to wind. The windward climb up toward Lonavala will wring more water out of that air than the file admits. Wet basalt. Wet tarmac with a film of monsoon oil on it. Altras with road lugs and thirty-hour proprioception. Shorten the stride on the descents. Cadence up. Do not chase free downhill speed with a brain that has been awake for a day and a half. The mountain does not care about your split.
• Drink to thirst, not to the clock.
  This is the counterintuitive one, the one my instincts will get wrong. In this soup I will sweat rivers and evaporate almost none of it, so I lose salt at a high rate while feeling cool and wet and not thirsty. Forcing fluid on a schedule for fifty hours in exactly these conditions is how people arrive at the finish hyponatremic and confused. The Hydration Plus is doing the real work. Let the sodium hold the water in. Trust thirst. It is smarter than the plan.
• Feet are infrastructure, not vanity.
  Fifty hours wet is a maceration problem before it is anything else. The Injinji toes and the SAXX mesh are good calls and they will still fail if I do not stop, dry, re-lube, and change socks like it is a job. It is a job. Treat it like one.

And the last note, which is not really a note, it is the whole thing.

This tradition is nineteen years old now. It started in 2007 for a reason I do not need to spell out on a blog because the people who need to know already know, and the reason is why I run for as many hours as I have years, and why the finish line has never once been the point. Seamount 3.0 is the last unfinished thread before JOGLE. The Babadook can come. He always comes. Grief is not something you outrun, I gave up believing that a long time ago, somewhere around hour twenty of a birthday I did not want to have. You do not outrun it. You just find out, again, that you can carry it and still put one Altra in front of the other.

The wet-bulb is twenty-six. Vishwas is at the other end. That is the whole forecast.

Six a.m. See you out there.