Current Conditions
Temp3.3 C
RH75 %
WindE 8 mph
RoadClosed
Latest Summit Road Surface Observations

LocationDate - TimeConditionGrip Surface TempAir Temp
UKIRTAugust 20, 2019 - 1837 HSTDryGood 7.8 oC2.5 oC
Haukea PassCLEAR
Upper Switch BackNot Operable
Summit Road Surface Observations Trend and UKIRT Web Cam

Latest Lens Code

Received optical signal is low enough that lens could be "Soiled" if condition continues for a long time. Note that a 4 reading is normal in adverse weather conditions.
Raw UKIRT Road Surface Observations

Date HST xvalue yvalue ratio airtmpc sfctmpc ave cond
code
cur cond
code
ave fric
code
cur fric
code
soiled
lens
grip
20190820 18:37:23 1737 1725 1.007 2.5 7.8 DRY DRY 0.80 0.80 4 GOOD
20190820 18:36:23 1737 1725 1.007 2.5 7.8 DRY DRY 0.80 0.80 4 GOOD
20190820 18:35:23 1736 1724 1.007 2.5 7.8 DRY DRY 0.80 0.80 4 GOOD
20190820 18:34:23 1736 1724 1.007 2.5 7.8 DRY DRY 0.80 0.80 4 GOOD
20190820 18:33:22 1729 1724 1.003 2.6 7.8 DRY DRY 0.80 0.80 4 GOOD
Ice Detector Network Road Surface Observations

Haukea Pass
Date HST xvalue yvalue ratio airtmpc sfctmpc ave cond
code
cur cond
code
ave fric
code
cur fric
code
soiled
lens
grip RH
20190805 20:40:42 1882 1741 1.081 4.93 6.57 DRY DRY 0.80 0.80 4 GOOD 78.56
20190805 20:39:42 1880 1730 1.087 4.89 6.55 DRY DRY 0.80 0.80 4 GOOD 80.24
20190805 20:38:42 1878 1668 1.126 4.87 6.53 DRY DRY 0.70 0.70 4 GOOD 80.85
20190805 20:37:42 1872 1641 1.141 4.85 6.61 DRY DRY 0.70 0.70 4 GOOD 78.84
20190805 20:36:42 1868 1551 1.205 4.83 6.61 DRY DRY 0.38 0.38 4 FAIR 79.39
Disclaimer

The road surface condition detector cannot determine the road surface condition when there is fog. However, if the temperature is near freezing and fog is present, road ice is highly likely.

The road surface condition detector only looks at a one foot diameter area of asphalt located on the summit ridge adjacent to the United Kingdom Infra-Red Telescope. As Mauna Kea has many micro-climates, the detector may indicate the road is clear while hazardous conditions exist in other locations.