The Prediction Lab & The City of Salem

Dec 16, 2024

Dec 16, 2024

Click here to see the live and interactive Harmful Algal Bloom dashboard.

7-day Look Ahead Bloom Forecast

Below are pie charts describing the probability of a cyanobacterial bloom. The one on the left describes the predictions from two weeks ago, and the one on the right describes the latest prediction, for the coming week. image-center Probabilities for different levels of cyanobacterial concentrations from two weeks ago (left) and for the next 7 days (right).

Hotspot Analysis - Chlorophyll-a

This map shows you the latest estimates of chlorophyll-a from the Sentinel 2a satellite. Note that the color scale is normalized to highlight the hotspots in the image. The colorscale does not provide an indication of the absolute amount of chlorophyll-a in the water and should be interpreted as an “index” of chlorophyll-a. image-center
Latest chlorophyll-a map from the Sentinel 2a satelllite.

Hotspot Analysis - CyAN

This map shows you the latest estimates of the concentration of cyanobacteria (cells/ml) from the EPA CyAN program. image-center
Latest CyAN map from the EPA.

Where we are in the season

This plot shows the historical expectation for HAB risk over the year. Use this chart to see where we are in the season (identified by the vertical red line). image-center Harmful algal bloom risk over the year.

How rainy has it been?

We know that in general certain weather conditions promote the likelihood of HABs. Check this chart to see how wet it is, relative to past years. This is simply adding up each day’s rainfall, for each year. If the red line is below the orange line, then this year is dryer than average. image-center Precipitation at the lake compared to previous years.

How hot has it been?

We know that in general certain weather conditions promote the likelihood of HABs. Check this chart to see how hot it is, relative to past years. This is simply adding up each day’s temperature, for each year. If the red line is above the orange line, this year is hotter than average. image-center Air temperature at the lake compared to previous years.

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