Weather Alert in Texas
Hydrologic Outlook issued August 24 at 1:34AM CDT by NWS Brownsville TX
AREAS AFFECTED: Brooks, TX
DESCRIPTION: ESFBRO The Brownsville Texas National Weather Service Office has implemented Advanced Hydrologic Prediction Service (AHPS) for the Los Olmos Creek basin in Deep South Texas. AHPS enables the National Weather Service to provide long-range probabilistic outlooks. This service is also available on the internet. In the table below...the 90 through 10 percent columns indicate the chance the creek could rise above the listed stage levels in the next 90 days. Example: The Los Olmos Creek near Falfurrias has a flood stage of 11 feet. There is a 50 percent chance the Falfurrias forecast point will rise above 2.2 feet during the next 90 days. Chance of Exceeding Stages at Specific Locations Valid [08/20/2025 - 11/18/2025] Location FS(FT) 90% 80% 70% 60% 50% 40% 30% 20% 10% -------- ----- --- --- --- --- --- --- --- --- --- Los Olmos Creek Falfurrias 11.0 1.8 1.8 1.8 2.0 2.2 3.0 3.7 4.5 4.9 This long-range probabilistic outlook contains numbers that are calculated using multiple scenarios from 50 years of historical climatological and stream flow data. These numbers also take into account current conditions of the creek and soil moisture. By providing the complete range of probabilistic numbers...the level of risk associated with the long-range planning decisions can be determined. Additional supportive data and explanation are available on the internet at: http://water.weather.gov/ahps2/long_range.php?wfo=bro Long range probabilistic outlooks are issued around the third Thursday of every month.
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Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
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Weather Topic: What is Precipitation?
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Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
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