Surface Condition Definitions

The following surface status codes are listed in order of severity with the most critical status listed first. Third party vendors may calculate surface conditions differently. Please contact your equipment vendor for details.

Status Description
Data Expired The data collected from the site has expired. Typically, the expiration period is 2 hours.
Data Not Applicable The sensor or site does not match the current sensor filter selected. This status color will only be displayed on overlay maps.
Snow/Ice Warning Continuous film of ice and water mixture at or below freezing (32F / 0C) with insufficient chemical to keep the mixture from freezing.
This status can only be reported at SSI ESP and SP sites when precipitation occurs.
Ice Warning Continuous film of ice and water mixture at or below freezing (32F / 0C) with insufficient chemical to keep the mixture from freezing.
This status can only be reported at NTCIP sites.
Snow Warning This status can be reported at NTCIP sites, but will not be reported by SSI NTCIP sites.
Wet Below Freezing Moisture on pavement sensor with a surface temperature below freezing (32F / 0C).
This status will only be reported at SSI SCAN Detector sites.
Frost Moisture on pavement at or below freezing (32F / 0C) with a pavement temperature at or below the dew point temperature.
This status can only be reported by SSI ESP, SP, and NTCIP sites when precipitation is not occurring.
Snow/Ice Watch Thin or spotty film of moisture at or below freezing (32F / 0C).
This status can only be reported at SSI ESP and SP sites when precipitation is not occurring.
Ice Watch Thin or spotty film of moisture at or below freezing (32F / 0C).
This status can only be reported at NTCIP sites when precipitation is not occurring.
Snow Watch This status can be reported at NTCIP sites, but is not detected at SSI NTCIP sites.
Chemical Wet Continuous film of water and ice mixture at or below freezing (32F or 0C) with enough chemical to keep the mixture from freezing.
This status can only be reported by SSI ESP, SP, and NTCIP sites when precipitation occurs.
Wet Continuous film of moisture on the pavement sensor with a surface temperature above freezing (32F or 0C).
This status can be reported by SSI ESP, SP, SCAN Detector, and NTCIP sites when precipitation has occurred.
Damp Thin or spotty film of moisture above freezing (32F or 0C).
This status can only be reported by SSI ESP, and SP sites when precipitation is not occurring.
Trace Moisture Thin or spotty film of moisture above freezing (32F or 0C). Surface moisture occurred without precipitation being detected.
This status will only be reported at NTCIP sites when precipitation is not occurring.
Absorption at Dewpoint, Absorption, & Dew These statuses can be reported at NTCIP sites, but are not currently detected at SSI NTCIP sites.
Dry Absence of moisture on the surface sensor.
This status can be reported by SSI ESP, SP, SCAN Dectector, and NTCIP sites.
No Report The surface sensor is not operating properly and requires maintenance.
This status will only be reported by SSI ESP and SP sites.
Error The surface sensor is not operating properly and requires maintenance.
This status will only be reported by NTCIP sites.


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