Thunderstorms are possible around Sachigo Lake, Bearskin Lake, Kitchenuhmaykoosib Inninuwug and Sandy Lake today or tonight. Weather Advisories and WarningsYellow Heat Warning for Sandy LakeEnvironment Canada issued a yellow heat warning for Sandy Lake, Weagamow Lake and Deer Lake at 5:27 a.m. EDT Wednesday. The high will reach 27°C, with a Humidex of 33 and a high UV index of 6. The high will be 28°C, with a Humidex of 33 and a high UV index of 7. The high will reach 27°C, with a Humidex of 31 and a high UV index of 7.