Weather Alert in California
Special Weather Statement issued July 29 at 5:44PM PDT by NWS San Francisco CA
AREAS AFFECTED: San Francisco; Coastal North Bay Including Point Reyes National Seashore; North Bay Interior Valleys; San Francisco Bay Shoreline; San Francisco Peninsula Coast; Northern Monterey Bay; Southern Monterey Bay and Big Sur Coast
DESCRIPTION: ...TSUNAMI WATCH IS IN EFFECTOR COASTAL AREAS FROM SONOMA COUNTY SOUTHWARD TO MONTEREY COUNTY INCLUDING THE BAY AREA COASTLINE... THE NATIONAL WEATHER SERVICE HAS ISSUED A TSUNAMI WATCH FOR COASTAL AREAS FROM SONOMA COUNTY SOUTHWARD TO MONTEREY COUNTY INCLUDING THE BAY AREA COASTLINE. IF YOU ARE LOCATED IN THIS COASTAL AREA, STAY ALERT FOR FURTHER UPDATES. AT 425 PM PACIFIC DAYLIGHT TIME ON JULY 29 AN EARTHQUAKE WITH PRELIMINARY MAGNITUDE OF 8.7 OCCURRED 80 MILES SOUTHEAST OF PETROPAVLOVSK KAMCHATKA. ESTIMATED ARRIVAL TIMES FOR THE FIRST IN THE SERIES OF TSUNAMI WAVES ARE AS FOLLOWS IN PACIFIC DAYLIGHT TIME. SAN FRANCISCO CALIFORNIA ON JULY 30 AT 1240 AM. ONCE AGAIN, THE NATIONAL WEATHER SERVICE HAS ISSUED A TSUNAMI WATCH FOR THE FOLLOWING LOCATIONS, COASTAL AREAS FROM SONOMA COUNTY SOUTHWARD TO MONTEREY COUNTY INCLUDING THE BAY AREA COASTLINE. IF YOU ARE LOCATED IN THIS COASTAL AREA, STAYALERT FOR FURTHER UPDATES. STAY TUNED TO YOUR LOCAL NEWS SOURCE AND NOAA WEATHER RADIO FOR FURTHER INFORMATION AND UPDATES.... * LOCAL IMPACTS...COASTAL AREAS FROM SONOMA COUNTY SOUTHWARD TO MONTEREY COUNTY INCLUDING THE BAY AREA COASTLINE * RECOMMENDED ACTIONS... For people in the watch area...If you are located in this coastal area, stay alert for further updates, as well as instructions from your local emergency officials. * FORECAST TSUNAMI START TIMES...San Francisco Bay, Monterey Bay, and Central Coast of California 1215 AM PDT on Jul 30 Tsunamis often arrive as a series of waves or surges which could be dangerous for many hours after the first wave arrival. The first tsunami wave or surge may not be the highest in the series. * FORECAST TSUNAMI DURATION... TSUNAMI WATCH iS UNIL FURTHER NOTICe * PRELIMINARY EARTHQUAKE INFORMATION... An earthquake occurred with a preliminary magnitude of 8.7. This product will be updated as new information becomes available. Stay tuned to your local news source and NOAA weather radio for further information and updates.
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Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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