By Lukie Pieterse, Potato News Today

Baseline routines that turn storage data into better decisions – and fewer late-season shocks.

Potato storages rarely fail all at once. More often, they drift – quietly – until the first rejection, the first hotspot, the first “odd smell,” or the first weight-loss surprise turns a manageable season into a daily firefight.

This article is a follow-up to Potato News Today’s Storage Season Essentials feature published January 21, 2026: “The storage baseline that saves crops: 10 measurements every potato facility should track mid-season.” This installment stays in the same lane: practical routines for the people who carry the responsibility of the pile – one sensible baseline at a time.

The purpose here is straightforward: take what you’re already measuring and turn it into a weekly routine that catches problems early enough to fix them calmly.

Why a weekly audit – and why 60 minutes

By late January into February, many of the biggest risks are no longer about “getting into storage.” They’re about maintaining control through weather swings, respiration changes, and the slow emergence of weak zones.

Most expensive late-season issues begin as small patterns:

• temperature gradients widening instead of tightening
• CO₂ creeping upward in one area (where measured)
• repeated condensation risk during warm spells and moisture events
• fans running longer “just in case,” slowly drying the crop
• dead zones forming where air short-circuits, leaks, or can’t push evenly through the pile

A weekly audit works because it forces two things that are easy to skip in the rush of day-to-day work:

• pattern recognition (not just daily numbers)
• a simple decision loop: observe – interpret – adjust – document

Sixty minutes is intentional. It’s long enough to be meaningful and short enough to be repeatable every week, even when the schedule is tight.

The 60-minute weekly audit – a simple structure that scales

Think of this as six blocks of 10 minutes. In large operations, you may run this per bay or per zone. In smaller operations, you can often cover the entire facility in one pass.

Trend scan – what changed since last week?

Start with what you already collect: pile temperatures, supply/plenum temps, RH/dew point (if available), CO₂ (if available), and fan run time.

You’re not hunting for “perfect numbers.” You’re hunting for direction.

Focus questions:

• where did temperatures drift – and where did they stay stable?
• did gradients tighten or widen?
• did fan run time increase without a clear reason?
• did outside weather swings line up with changes in pile behaviour?
• did any zone behave differently than the rest?

A practical way to avoid data overload:

• compare this week vs last week
• compare warmest zone vs coolest zone
• compare the most responsive zone vs the least responsive zone

Pile profile check – gradients and response

This is where mid-season reality shows up. A single “average pile temperature” can look fine while the pile becomes uneven – and uneven piles tend to create uneven outcomes.

What to check:

• top vs mid vs bottom temperatures (where possible)
• centre vs perimeter (walls, doors, corners)
• front/middle/back, or across ducts/zones
• response to a typical fan cycle (does it equalize or resist?)

A quick interpretation framework:

• normal: differences are small, stable, or slowly narrowing
• watch: differences widen gradually week over week
• act now: a zone stays warm, grows warmer, or stops responding to ventilation

Low-tech note: consistent measurement locations beat “lots of random readings.” Pick a simple map and stick to it.

Air delivery reality check – supply air, plenum, and distribution

Mid-season is when airflow problems become expensive because the pile is now a cold mass. If air distribution is weak, certain zones begin to drift biologically (heat, moisture, CO₂) even while the rest looks “fine.”

What to check:

• supply air temperature (not only outside air)
• plenum temperature at more than one point if possible
• signs of short-circuiting (air taking the easiest path)
• obvious bypass routes or leaks (doors, louvers, cracks, poor seals)

Fast clues distribution is slipping:

• some areas respond quickly while others barely move
• CO₂ rises in one area despite fan hours (if measured)
• recurring “same spot” issues year after year

If you can measure static pressure, this is where it belongs in the weekly audit: same point(s), same day each week, looking for drift.

Moisture risk check – RH, dew point thinking, condensation scouting

Late January onward is often when outside air becomes unpredictable: warm spells, fog, rain events, and rapid swings. This is when ventilation can either protect quality or quietly trigger condensation events that accelerate breakdown.

What to check:

• RH trends in context (not as a standalone “target”)
• dew point readings (if available) or condensation-risk logic (if not)
• physical evidence of moisture deposition:
  • roof drip patterns
  • wall frost changes
  • damp corners
  • fogging at openings during fan changes
  • top-of-pile dampness near walls

Interpretation that keeps people out of trouble:

• normal: surfaces stay dry, frost patterns stable, no new damp zones
• watch: new frost patterns, occasional fogging, localized dampness
• act now: repeated condensation evidence, damp odours, or wet zones that persist

A common mid-season trap is “habit ventilation” during a warm spell. Late winter air can carry enough moisture to create sweating events when it meets a cold pile or cold building surfaces.

Biology check – CO₂, odour, hotspots, and the “message” of the pile

If you measure CO₂, treat it as a quiet warning system. If you don’t, treat odour and temperature behaviour as your biological indicators.

What to check:

• CO₂ trend direction (stable vs creeping)
• zone differences (one area rising while others remain steady)
• odour changes, especially localized odours
• any warm spot that persists despite comparable fan cycles

Interpretation:

• normal: CO₂ stable (or consistent), odours normal, no persistent warm zones
• watch: CO₂ creeping slowly, subtle odour shifts, mild persistent gradients
• act now: CO₂ rise in one zone + warm spot + odour change (a common early breakdown signature)

Mid-season principle: avoid panic actions that destabilize the pile. Hotspots and breakdown rarely improve when decisions become chaotic.

Documentation and decision notes – the part people skip and regret

A weekly audit is only as useful as the decisions it produces. This is also the moment where the human element matters most: crews change, shifts rotate, memory fades, and “we thought we did” becomes the start of confusion.

At minimum, write down:

• what changed (one short paragraph)
• what you think it means (one short paragraph)
• what you’re going to adjust (one short paragraph)
• when you’ll re-check (a specific day/time)

Also record:

• unusual loads (wet, muddy, bruised, late harvest) and where they are
• major weather events (warm spell, rain, fog, rapid swings)
• changes to fan logic or setpoints

This is not paperwork for its own sake. It’s how you protect clarity, protect continuity, and protect the operation when questions arise later.

A practical ‘Normal – Watch – Act Now’ guide

Use this as a mental shortcut to keep decisions consistent.

• normal: stable trends, predictable responses, no new patterns
• watch: slow drift, widening gradients, repeated minor anomalies
• act now: persistent warm spot, repeated condensation evidence, localized odour, CO₂ rising in a specific zone, or zones failing to respond to ventilation

Rule of thumb: if you see two “act now” signals together (example: odour + warm spot), don’t wait for a third.

Common scenarios – and how the weekly audit prevents late-season surprises

Warm spell in late January or February
What the audit catches: condensation evidence, changing frost patterns, temperature noise that wasn’t present during stable cold weather.
Sensible response: shift from cooling mindset to stability mindset, avoid long fan runs during moisture-risk windows, increase walk-through frequency during and after the warm spell, document what changed and why.

CO₂ creep over several weeks
What the audit catches: slow upward trend that daily checks normalize, one zone rising while others remain steady.
Sensible response: suspect dead zones and distribution first, confirm sensor placement/accuracy where applicable, avoid overcorrecting with ventilation during condensation-risk conditions.

A dead zone forming
What the audit catches: one part of the pile not responding after comparable fan cycles, gradients widening week over week.
Sensible response: investigate short-circuiting, leaks, blockages, and airflow pathways – then target the response rather than “run fans longer everywhere.”

Unexpected shrink showing up at shipping
What the audit catches: fan run time creeping upward during very dry outside conditions, surface dryness near airflow pathways, a pattern of “just in case” ventilation.
Sensible response: rebalance toward stability, reduce unnecessary drying, re-check RH trends in context, document what changed so you can learn season over season.

New odour in one area
What the audit catches: localized smell changes before visible breakdown, zone divergence in temperature and/or CO₂.
Sensible response: document location and timing immediately, cross-check temperature and moisture risk in that zone, increase monitoring frequency and avoid destabilizing fan decisions.

One-page weekly audit checklist

The checklist below is designed as a practical “one-page” weekly tool that storage managers and crews can use to keep mid-season storage on track. It follows the same Normal – Watch – Act now logic outlined in this article and converts it into a repeatable routine that can be completed in about 60 minutes per storage bay or zone.

You may want to copy and paste the table into your operation’s logbook, print it for the office wall, or use it as a consistent handover reference between shifts.

Audit block	What to check	Normal	Watch	Act now	Notes / actions
Trend scan	Temps, RH/dew point, CO₂ (if available), fan hours vs last week	Stable trends	Slow drift	Fast drift or zone divergence
Pile profile	Top/mid/bottom; centre/perimeter; zone response after fan cycle	Gradients stable or narrowing	Gradients widening	Persistent warm spot / non-response
Air delivery	Supply air, plenum temps, leaks, short-circuiting signs, static pressure (if available)	Consistent delivery	Uneven response	Dead zone signature
Moisture risk	RH in context, dew point logic, condensation evidence (roof/walls/louvers/top-of-pile)	Dry surfaces, stable patterns	New frost / occasional fogging	Repeated condensation / damp odours
Biology check	CO₂ trends (if available), odour scan, hotspot scan	Stable	Creeping trend	CO₂ rise + warm spot + odour
Document decisions	What changed, what it means, what we adjust, when re-check	Clear weekly notes	Partial notes	No notes / unclear rationale

The takeaway

Mid-season storage is where professionalism shows – not because it’s glamorous, but because it’s repetitive, quiet, and unforgiving. Most of the time, nothing dramatic happens on a Tuesday afternoon in late January. What happens instead is drift: a little more fan time than necessary, a warm spell that quietly raises condensation risk, a weak airflow zone that slowly becomes biologically active, a corner that stops behaving like the rest of the pile.

A weekly audit keeps you ahead of that drift. It turns storage from a string of isolated daily tasks into a steady management rhythm – one that crews can repeat, hand over between shifts, and improve season over season. Just as importantly, it reduces stress. When you know what you’re looking for, and you’re looking for it consistently, you’re less likely to overreact, less likely to destabilize the pile with panic ventilation, and more likely to make small corrections that prevent big losses.

In plain terms: the 60-minute weekly audit is a way to protect quality, protect profitability, and protect the people doing the work. It doesn’t require perfect equipment. It requires consistency, attention, and a habit of writing down what changed and why. And by March and April, those small habits often separate a calm shipping season from a costly one.

Author: Lukie Pieterse, Potato News Today