Weather Alert in Pennsylvania
Special Weather Statement issued April 25 at 3:58AM EDT by NWS State College PA
AREAS AFFECTED: Juniata; Franklin; Southern Lycoming; Union; Snyder; Montour; Northumberland; Columbia; Perry; Dauphin; Schuylkill; Lebanon; Cumberland; Adams; York; Lancaster
DESCRIPTION: A combination of warm temperatures in the mid to upper 70s, low relative humidity in the 35 to 45 percent range, dry fine fuels and leaf litter, and a moderately gusty southerly breeze in the teens will create an elevated risk of wildfire spread today across a portion of South Central Pennsylvania and the Susquehanna Valley. The period of greatest potential for wildfire spread will be between 11 am and 7 pm today. Residents are urged to exercise caution if handling any potential ignition sources, such as machinery, cigarettes, or matches. If dry grasses and tree litter begin to burn, the fire will have the potential to spread rapidly. For more information about wildfire danger and wildfire prevention and education, please visit the Pennsylvania Department of Conservation and Natural Resources website at http://dcnr.pa.gov/Communities/Wildfire.
INSTRUCTION: N/A
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Weather Topic: What are Stratocumulus Clouds?
Home - Education - Cloud Types - Stratocumulus Clouds
Next Topic: Stratus Clouds
Stratocumulus clouds are similar to altocumulus clouds in their
fluffy appearance, but have a slightly darker shade due to their additional mass.
A good way to distinguish the two cloud types is to hold your hand out and measure
the size of an individual cloud; if it is the size of your thumb it is generally
an altocumulus cloud, if it is the size of your hand it is generally a
stratocumulus cloud.
It is uncommon for stratocumulus clouds to produce precipitation, but if they do
it is usually a light rain or snow.
Next Topic: Stratus Clouds
Weather Topic: What are Wall Clouds?
Home - Education - Cloud Types - Wall Clouds
Next Topic: Altocumulus Clouds
A wall cloud forms underneath the base of a cumulonimbus cloud,
and can be a hotbed for deadly tornadoes.
Wall clouds are formed by air flowing into the cumulonimbus clouds, which can
result in the wall cloud descending from the base of the cumulonimbus cloud, or
rising fractus clouds which join to the base of the storm cloud as the wall cloud
takes shape.
Wall clouds can be very large, and in the Northern Hemisphere they generally
form at the southern edge of cumulonimbus clouds.
Next Topic: Altocumulus Clouds
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