<p>I think that it's referring to hundredths of an inch, and "hundreds" is a typo for "hundredths". <a href="https://www.faa.gov/other_visit/aviation_industry/airline_operators/airline_safety/info/all_infos/media/2008/info08024.pdf" rel="nofollow">This FAA information sheet</a> says:</p>

<blockquote>
  <p>All ice accretion amounts will be reported to the nearest one-hundredth of an inch (0.01 in.). An example of a 1, 3, 6-hour ice accretion remark would be: “I1010 I3015 I6022.” This translates to 0.10 inches of ice in the last hour, 0.15 inches of ice in the last 3 hours, and 0.22 inches of ice in the last 6 hours.</p>
</blockquote>

<p>This also matches the terminology used in some other weather reports, such as <a href="https://climate.ncsu.edu/climate/winter_wx/database_details.php?e=605" rel="nofollow">this one</a>:</p>

<blockquote>
  <p>Ice accretion was light, generally only a few hundredths of an inch...</p>
</blockquote>

CC BY-SA 3.0
2016-02-24T13:07:34.267Z
2016-02-24T13:07:34.267Z
Pont
<p>I saw this line today in a NWS weather alert:</p>

<ul>
<li>ACCUMULATIONS...A FEW HUNDREDS OF ICE ACCRETION.</li>
</ul>

<p>Is this standard terminology?
Does "hundreds (of)" somehow refer to a unit of measure, or
is there a (likely or standard) unit of measure implied or missing here?</p>

<p><a href="http://alerts.weather.gov/cap/wwacapget.php?x=MA1255EAFEBC38.WinterWeatherAdvisory.1255EB001010MA.BOXWSWBOX.18aa678bad1893fa8f6667c193e56ef4" rel="nofollow">http://alerts.weather.gov/cap/wwacapget.php?x=MA1255EAFEBC38.WinterWeatherAdvisory.1255EB001010MA.BOXWSWBOX.18aa678bad1893fa8f6667c193e56ef4</a></p>

<meteorology><terminology>
Definition of "hundreds of ice accretion"
user1542234
# Definition of "hundreds of ice accretion"

(Asked by: username_0 on 2016-02-24)

I saw this line today in a NWS weather alert:

* ACCUMULATIONS...A FEW HUNDREDS OF ICE ACCRETION.

Is this standard terminology?
Does "hundreds (of)" somehow refer to a unit of measure, or
is there a (likely or standard) unit of measure implied or missing here?

<http://alerts.weather.gov/cap/wwacapget.php?x=MA1255EAFEBC38.WinterWeatherAdvisory.1255EB001010MA.BOXWSWBOX.18aa678bad1893fa8f6667c193e56ef4>

**Tags:** meteorology, terminology


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## 1 answers

### Answer by username_1 on 2016-02-24. Score: 2 | Accepted answer

I think that it's referring to hundredths of an inch, and "hundreds" is a typo for "hundredths". [This FAA information sheet](https://www.faa.gov/other_visit/aviation_industry/airline_operators/airline_safety/info/all_infos/media/2008/info08024.pdf) says:

> All ice accretion amounts will be reported to the nearest one-hundredth of an inch (0.01 in.). An example of a 1, 3, 6-hour ice accretion remark would be: “I1010 I3015 I6022.” This translates to 0.10 inches of ice in the last hour, 0.15 inches of ice in the last 3 hours, and 0.22 inches of ice in the last 6 hours.

This also matches the terminology used in some other weather reports, such as [this one](https://climate.ncsu.edu/climate/winter_wx/database_details.php?e=605):

> Ice accretion was light, generally only a few hundredths of an inch...


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