Good morning. Both lakes are in normal range this Saturday, September 12, and no flood alerts are in effect for the Lake Houston area. The National Weather Service does have a Heat Advisory up for Harris and Montgomery counties from noon to 6 p.m. today, with heat index values as high as 109.
Lake levels at a glance
| Lake | Level | Percent full | Reading |
|---|---|---|---|
| Lake Houston | 42.55 feet | 100.0% | 5:30 a.m. Central, Saturday, September 12 |
| Lake Conroe | 199.91 feet | 94.9% | Daily value, September 12 |
Lake Houston
The USGS gauge at Lk Houston nr Sheldon, TX, site 08072000, read 42.55 feet at 5:30 a.m. Central on Saturday, September 12. Over the past 48 hours the lake has moved in a narrow band between 42.47 and 42.58 feet, which is routine for this time of year. The Texas Water Development Board independently recorded 42.55 feet for the same day, an exact match with the USGS reading, and puts the reservoir at 100.0 percent of its conservation capacity.
Lake Conroe
The Texas Water Development Board lists Lake Conroe at 199.91 feet and 94.9 percent full for September 12, down 0.02 feet from the 199.93 feet recorded a day earlier. That is a slow, steady decline rather than anything unusual. This is a once daily value, not 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 is part of the flooding picture in Kingwood, Humble and Atascocita.
Weather
Today. A chance of showers and thunderstorms after 10 a.m., partly sunny, with a high near 96 and temperatures falling to around 93 in the afternoon. Heat index values as high as 110. South wind 5 to 10 mph. Chance of precipitation 50 percent, with new rainfall amounts between a tenth and a quarter of an inch possible.
Tonight. A chance of showers and thunderstorms before 11 p.m., then partly cloudy, with a low around 77. Heat index values as high as 105. South wind 0 to 10 mph. Chance of precipitation 50 percent, with new rainfall amounts between a tenth and a quarter of an inch possible.
Sunday. A chance of showers and thunderstorms after 7 a.m., mostly sunny, with a high near 95 and temperatures falling to around 92 in the afternoon. Heat index values as high as 109. South wind 0 to 10 mph. Chance of precipitation 30 percent.
Active alerts
A Heat Advisory issued by the National Weather Service Houston/Galveston office is in effect from noon to 6 p.m. Saturday for inland Harris County and Montgomery County, among other parts of south central and southeast Texas. The advisory warns of heat index values up to 109 and notes that hot temperatures and high humidity may cause heat illnesses. Forecasters advise drinking plenty of fluids, staying in air conditioning, limiting strenuous activity to early morning or evening, and checking on relatives and neighbors.
Liberty County is not included in the advisory. There are no flood, flash flood or river flood alerts in effect for Harris, Montgomery or Liberty counties.
Sources
Lake Houston elevation from the U.S. Geological Survey. Lake Conroe and Lake Houston storage 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.
