Both lakes in the Lake Houston watershed sat in their normal range on Monday evening, and no flood, flash flood or river flood alert was in effect for Harris, Montgomery or Liberty counties. The only active National Weather Service alert for the area is a Heat Advisory that runs through Tuesday evening.
Lake levels at a glance
| Lake | Level | Percent full | Reading |
|---|---|---|---|
| Lake Houston | 42.45 feet | 100.0% | 5:30 p.m. Central, Monday, September 14 |
| Lake Conroe | 199.87 feet | 94.7% | Daily value, September 14 |
Lake Houston
The U.S. Geological Survey gauge at Lk Houston nr Sheldon, site number 08072000, read 42.45 feet at 5:30 p.m. Central on Monday, September 14. Over the previous 48 hours the gauge recorded 190 readings running back to 6:15 p.m. Saturday, September 12, with a range of 42.40 to 42.53 feet.
The lake is down 0.05 feet from the 42.50 feet it read at 5:30 a.m. the same morning, and down 0.01 feet from the same hour Sunday. That is the ordinary slow afternoon drawdown the gauge has shown for more than a week. The Texas Water Development Board put Lake Houston at 42.49 feet and 100.0 percent full for the same date, a daily value that sits four hundredths above the evening gauge reading, which is what a daily average should look like against a reading taken after the lake eased down through the afternoon.
Lake Conroe
The Texas Water Development Board recorded Lake Conroe at 199.87 feet and 94.7 percent full for September 14, down 0.02 feet from the 199.89 feet recorded September 13. The lake has eased down by about two hundredths of a foot per day for more than a week. This is a once daily value rather than an intraday reading.
San Jacinto River Authority releases from Lake Conroe flow down the West Fork of the San Jacinto River into Lake Houston, which is why an upstream Montgomery County reservoir belongs in the local flooding picture in Kingwood, Humble and Atascocita.
Weather
Tonight: A slight chance of showers and thunderstorms before 7 p.m., then mostly clear, with a low around 77. Heat index values as high as 102. South wind 0 to 5 mph. Chance of precipitation 20 percent.
Tuesday: Mostly sunny with a slight chance of showers and thunderstorms between 2 p.m. and 3 p.m. High near 95, with temperatures falling to around 91 in the afternoon. Heat index values as high as 107. Southeast wind 0 to 10 mph. Chance of precipitation 20 percent.
Tuesday night: Mostly clear, with a low around 76. Heat index values as high as 101. East wind 0 to 5 mph. The Weather Service does not state a precipitation chance for this period.
Active alerts
The National Weather Service in Houston/Galveston has a Heat Advisory in effect until 7 p.m. Central Tuesday, issued at 1:18 p.m. Monday. The advisory covering inland Harris County, Montgomery County and northern Liberty County carries heat index values up to 110. A companion advisory covering coastal Harris County and Galveston County carries heat index values up to 109. The Weather Service warns that hot temperatures and high humidity may cause heat illnesses.
No flood, flash flood or river flood alert is in effect for Harris, Montgomery or Liberty counties.
Sources
Lake Houston elevation from the U.S. Geological Survey, gauge 08072000. Lake Conroe and Lake Houston percent full from the Texas Water Development Board. Forecast and alerts from the National Weather Service Houston/Galveston. Gauge readings are provisional and subject to revision by the USGS.
