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Reading a Cumulus Gauge Dashboard

How to read a Cumulus gauge dashboard as simultaneous current observations: check the clock first, then pressure tendency, then the wind speed.

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A gauge dashboard is a row of analog-style instruments that claim to show the same instant: temperature, pressure, humidity, wind, sometimes rain rate. The scientific problem is not how pretty the needles are. It is whether those needles are simultaneous, whether the clock is still moving, and which quantity you should believe first when they disagree. On a well-run station the scan order is: time, then pressure tendency, then wind. Color bands and extra decimal places come last.

The historical URL /gauges.php on cumulus.tnetweather.com was that dashboard. The original widgets are not rehosted. This page is a reading order for simultaneous current observations. It is not a treatise on scale ends and color mapping; that mapping problem lives at /phpversion/gauges.php. It is not a time-series; graphs and temperature charts hold history.

Historical context

Cumulus sites borrowed the language of a ship’s panel: round dials, a wind analog, a rain-rate arc. PHP/GD, Flash, then JavaScript all drew the same idea from realtime.txt, web tags, or XML. Visitors liked a glance. Operators liked a page that looked “live.” The failure mode is the opposite of a table: a stale table looks old; a stale needle still shines.

Incoming links wanted the instruments. Preservation keeps the URL as a guide to reading them together, not as a live Mesa (or other) panel.

Why the clock is the first instrument

Every other gauge is a derived display of an observed sample. If the sample is old, the dashboard is a historical illustration accidentally labeled “now.”

Read the timestamp before the temperature. Require:

  • date, time, and timezone or offset;
  • a max-age next to the panel (logger interval plus a small tolerance);
  • agreement among gauges. If temperature is stamped 14:02 and wind is stamped 09:17, they are not a dashboard. They are two relics.

When the clock is stale, stop. Do not interpret “falling” pressure from a file that stopped at breakfast. The mapped-instrument article states the same stale-data rule from the drawing side: a needle must not imply a live mapping when the logger is dead. Here the rule is operational: time is the first observation.

A dashboard that omits the clock is not simultaneous. It is a collage.

Pressure tendency is the second look

Once the time is current, pressure—and especially its tendency—is the synoptic instrument on the panel. A single pressure needle without a three-hour change is a number. A needle plus “falling 1.8 hPa / 3 h” is a motion.

Official surface practice treats pressure tendency as the character and amount of change over a specified interval, usually three hours. A hobby gauge that only paints “LOW” in red is not that. Prefer a numeric delta with an interval, or a documented characteristic (rising, falling, steady) tied to that interval. Sea-level-reduced pressure and station pressure are different; the dashboard must name which the needle uses.

Tendency before temperature is deliberate. Afternoon heating will move the thermometer every clear day. Tendency asks whether the mass field is moving. That is the difference between “it is hot” and “the pattern is changing.” Short-term rising/falling language is developed on the main host’s trends article. On this dashboard you only need the scan: if tendency is unavailable or unlabeled, you do not have a synoptic panel. You have a room thermometer with extra art.

Color bands on a barometer plate (“stormy / fair”) are folklore unless captioned as a display convention. They are not National Weather Service products.

Wind is the third look

Wind is the local motion that tendency does not give you. After clock and pressure, read:

  • mean speed and its averaging period (2-minute, 10-minute, or whatever the logger uses);
  • gust, named as gust, not as a second unlabeled needle;
  • direction, as a separate instrument (a speed arc does not carry a barb).

A calm wind with a crashing three-hour pressure fall is a different story from a gusty outflow with a jump in pressure and a rain-rate spike. The dashboard exists so those three can be seen together. If gust is missing, do not infer it from the mean needle. If direction is a 16-point compass word with no timestamp, treat it as weaker than a degree value with a time.

Siting still applies. A roof-adjacent cup in the wake of a chimney is a local anemometer. WMO wind exposure is not guaranteed by a shiny dial. The dashboard can only report the sensor it has. Metadata belongs in text beside the needles.

Then temperature, humidity, and rain rate

Those gauges are easier to over-read because they feel like comfort.

Temperature is the sensor’s air, at that mount, at the clock you already checked. It is not a climate normal and not a heat advisory. Indoor and outdoor must not share one unlabeled dial.

Humidity is relative humidity unless the dial says dewpoint. Pegged 100% or 1% with a living temperature needle is a ventilation or sensor fault, not a weather type.

Rain rate is a derived intensity from recent tips or a weighing increment. A pegged high rate for one refresh is often a dump. Pair it with a daily total in text if you show rate at all. Grain belongs on a rain-detail chart; the gauge is only the current derived rate.

Apparent temperature, humidex, wind chill, and heat index are indexes. If they appear as extra dials, caption them as indexes with validity limits, not as extra thermometers.

Simultaneous means one packet

Cumulus realtime.txt is one line of current values, rebuilt often, not a log. A dashboard that draws every needle from that one line is simultaneous by construction. A dashboard that mixes a realtime temperature with an hour-old FTP gust is not. Prefer one packet, one clock, many mappings.

XML or tag files that feed gauges are still that packet in another wrapper. Parsing them is a different URL’s job. This page assumes the feed is already in memory and asks how a human should scan it.

Official alerts remain at weather.gov. A red arc is not a warning service. TNET is not a warning service.

Practical scan

  1. Clock and max-age. If stale, the rest is historical.
  2. Pressure value, unit, type (station vs sea-level), and tendency with interval.
  3. Wind mean, gust, direction, averaging period.
  4. Temperature and humidity, outdoor vs indoor.
  5. Rain rate only as a current derived intensity.
  6. Indexes last, labeled as indexes.
  7. Then open graphs if you need the last day instead of the last sample.

If step 1 fails, do not skip to step 4 because the temperature dial is large.

Distinct from mapping, charts, and graph sets

/phpversion/gauges.php is about scale ends, tick spacing, color bands, and not implying extra precision. This URL assumes those mapping rules and teaches order of attention across several current instruments.

A temperature chart is history of one variable. A daily graph plate is history of several variables. Gauges are the current slice through that plate.

Modern relevance

Glanceable panels remain useful when the first glance is the clock. Research products have the same temptation: a single score that hides whether the inputs were observed at one time. TNET’s public explanation of evidence types, without internal weights, is how the service works. Station-era pages sit on the observations hub and the Cumulus hub.

This URL does not drive live needles. It states the order in which a simultaneous panel should be believed.

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