SST (MUR 1 km)
NASA's daily satellite temperature map, and the sharpest observed layer we carry. NASA fills the cloud holes, so under heavy overcast you are reading an estimate rather than a fresh measurement.
Updates daily
More detail
The newest picture is about a day and a half to two days old.
Where the sky was clear, the number is a real measurement in fine detail. A sharp break drawn under several days of overcast may not be where the map puts it. The layer covers the Gulf of America, the East Coast and Baja.
How it relates to the other temperature layers. SST (ACSPO 2km) and the GOES-19 layers (SST (L3 Composite), SST (2hr Composite)) leave cloud blank and show only what the satellite saw. Use this layer for the full picture with no holes. Use the layers with gaps to see what was really measured, and SST (2hr Composite) for the freshest look. Sea Surface Temperature, from HYCOM (U.S. Navy model), is a forecast, not a measurement. All of them share one color scale.
It reads cooler than your gauge on a hot calm afternoon: it reports the water just below the thin layer the sun warms during the day, as a daily value. At dawn the two are closer.
This layer should never be blank. If it is, contact support. If the colors look wrong after you change settings, reset the range in Layer Settings. The default is 41.9 °F to 91.4 °F.
The numbers
| How often it updates | Once a day, one frame per day |
| How fresh it usually is | About a day and a half to two days old |
| How detailed it is | About half a nautical mile (1 km) |
| Where it covers | Gulf of America, East Coast and Baja |
| How far back you can look | 8 days back |
| Goes blank under cloud? | Never |
| Observed or modeled | Both. Observed where the sky was clear, estimated where it was not |
| What you see on screen | Fahrenheit by default, Celsius if you switch |
Source: a satellite picture from MUR (NASA), several satellites merged; cloud holes filled by estimate.