Weather Alert in Oklahoma
Fire Weather Watch issued February 18 at 12:32PM CST until February 19 at 7:00PM CST by NWS Amarillo TX
AREAS AFFECTED: Cimarron; Texas; Dallam; Sherman; Hartley
DESCRIPTION: * WINDS...For the today, southwest 25 to 35 mph with gusts up to 55 mph. For the tomorrow, west to northwest 15 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...For the today, as low as 7 percent. For the tomorrow, as low as 9 percent. * TEMPERATURES...For the today, in the mid 60s. For the tomorrow, in the lower to mid 50s. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. * SEVERITY...Critical to Near Critical FUELS (ERC)...69th-70th percentile...3 (out of 5). WEATHER...Elevated...1 (out of 5). FIRE ENVIRONMENT...4 (out of 10).
INSTRUCTION: A Red Flag Warning means that critical fire weather conditions are either occurring now...or will shortly. A combination of strong winds...low relative humidity...and warm temperatures will create favorable weather for rapid fire growth and spread. Avoid activities that promote open flames and sparks. A Fire Weather Watch means that the potential for critical fire weather conditions exists. Listen for later forecasts and possible red flag warnings.
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Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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