The system remained a tropical depression until 0000 UTC on September 6, when it was estimated to have attained tropical storm intensity. At the time, the storm was estimated to have a minimum barometric pressure of at least 1010 mbar ( hPa 29.83 inHg). Its lack of organization resulted in its estimated misplacement inland over Mexico in the Signal Corps's weather map for September 5. In its initial stages after tropical cyclogenesis, the disturbance moved very slowly and did not intensify. The area of disturbed weather gradually organized, and was analyzed to have become a tropical depression by 1200 UTC on September 4. In early September, a trough of low-pressure persisted in the southwestern Gulf of Mexico, near the Bay of Campeche. Meteorological history Storm path of the hurricaneĮxtratropical cyclone, remnant low, tropical disturbance, or monsoon depression The high precipitation totals set nationwide records which would stand for several years. Similarly, an observation of 36.40 in (925 mm) elsewhere in Williamson County, Texas ranked as the sixth-highest tropical cyclone-related rainfall total for the state. Precipitation peaked over Central Texas, where the highest rainfall amount measured was 40 in (1,016 mm) near Thrall, Texas this was the fourth-highest tropical cyclone-related rainfall total in Texas since record keeping began. Due to an orographic lifting effect, the remnants were able to produce torrential and record rainfall over the state. However, a nearby high-pressure area forced the remnants of the system northward into Texas. The storm weakened over land, and lost cyclonic characteristics later that day. Moving slowly in a general westward direction, the disturbance reached hurricane intensity on September 7 prior to making landfall south of Tampico, Mexico the following day. On September 4, a tropical cyclone developed in the southwestern Gulf of Mexico near the Bay of Campeche. state of Texas, particularly in the San Antonio region. In early September 1921, the remnants of a Category 1 hurricane brought damaging floods to areas of Mexico and the U.S. Hurricanes affecting the Gulf Coast typically diminish to heavy showers by the time they arrive in the area.Surface weather analysis of the hurricane on September 7 after making landfall The distance of 140 miles from the Gulf Coast prevents tropical weather patterns from disturbing San Antonio’s weather. Severe Weather: San Antonio’s position in the central part of the state keeps it from harm’s way of “Tornado Alley” that is part of northern Texas and Oklahoma. Humidity and temperatures: Relative humidity is at its highest point during the cooler morning hours, dropping to its lowest point in the afternoon. Sunshine: San Antonio enjoys about 50% of the possible amount of sunshine during the winter months and more than 70% during the summer months. Measurable snow occurs rarely, although snowfall of two to four inches occurs about every ten years. Rainfall: The normal annual rainfall is approximately 28”, fairly well distributed throughout the year with the heaviest months being May and September. Mild weather prevails during the fall and winter months with below freezing temperatures occurring, on average, about twenty days each year. Extremely high temperatures, however, are rare. The warmest summer months, July and August, average daily temperatures above 90° over 80% of the time. Average temperatures range for 50° in January to the mid-90s in June. San Antonio experiences year-round weather.
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