All Weather News

Recent Earthquakes, Isaac Update, Labor Day Forecast

31 Aug 2012, 1:02 pm

Earthquakes

An earthquake this morning off the coast of the Philippines has caused some concerns for Tsunamis in the Pacific.  This was a strong earthquake with a magnitude of 7.9 but it was very deep at nearly 22 miles below the sea floor.  Epicenter was located 93km (58mi) East of Sulangan, Philippines.

Earlier this morning a Tsunami Watch had been issued for Hawaii but that has been canceled due to no apparent threat of a Tsunami from this earthquake.

California Earthquakes

A recent sequences of frequent earthquakes in Southern California is causing concern for residents. Although, none of these earthquakes were that significant, the number of them in a short period of time may mean that tectonic plates are becoming more unsettled. This type of event is called a Swarm. From Wikipeidia: “Earthquake swarms are events where a local area experiences sequences of many earthquakes striking in a relatively short period of time. The length of time used to define the swarm itself varies, but the United States Geological Survey points out that an event may be on the order of days, weeks, or months.[1] They are differentiated from earthquakes succeeded by a series of aftershocks by the observation that no single earthquake in the sequence is obviously the main shock. Earthquake swarms are one of the events typically preceding eruptions of volcanoes.”

Earthquakes from this past weeek:

And the Earthquakes have been continuing for the past day, with 72 reported in some of the same areas:

Images From the USGS

From the LATimes.com: “More than 400 earthquakes greater than magnitude 1.0 have been recorded in Imperial County since Saturday evening, said U.S. Geological Survey geophysicist Elizabeth Cochran. The largest were a 5.3 and a 5.5 about midday Sunday. Scientists say the reason is not fully understood, but there is a clue: Earthquake faults work much differently south of the Salton Sea than they do closer to Los Angeles. Take, for instance, the San Andreas fault as it runs through Los Angeles County. It’s a fault where, generally speaking, two plates of the Earth’s crust are grinding past each other. The Pacific plate is moving to the northwest, while the North American plate is pushing to the southeast. South of the Salton Sea, the fault dynamic changes. The Pacific and North American plates start to pull away from each other, Cochran told The Times from her Pasadena office. (That movement is what created the Gulf of California, which separates Baja California from the rest of Mexico.) So Imperial County is caught between these two types of faults in what is called the Brawley Seismic Zone, which can lead to an earthquake swarm, Cochran said.”

Rain Continues

Although Isaac has now lost its tropical cyclone status, it still bringing heavy rain and flooding conditions to the Central Mississippi River Valley before curving into the Ohio River Valley this weekend.  Rainfall totals will be impressive in these areas with the potential of 7 plus inches through early next week:

There could also be a chance for Severe Weather.

Not only is there concerns for damaging winds associated with severe thunderstorms but the sustained winds will also be quite strong.  Memphis has issued a  Wind Advisory:

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 25 TO 39 MPH ARE
EXPECTED...OR GUSTS WILL RANGE BETWEEN 40 AND 57 MPH. WINDS THIS
STRONG CAN MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE
VEHICLES. USE EXTRA CAUTION.

Holiday Weekend Outlook

With the exception of the portions of the Northeast and the Ohio River Valley, most of the nation will be able to enjoy pleasant conditions for the Labor Day weekend. Those of you in the Ohio River Valley will want to have a plan B in mind for out door plans throughout this coming weekend.

Saturday

Hot weather extends from the Dakotas all the way down to Texas.  A slight cool down for the Northeast while the Northwest keeps seasonal temperatures.

Sunday

Cooling down in the Midwest but staying hot in the Southern Plains.  Rain from Isaac will move through the Ohio Valley and into the Mid Atlantic region. Dryer weather slowly returns to the Gulf Coast.

 Monday

Cooling trend continues for the Midwest but remaining generally rain-free. Temperatures drop by about 10 degrees compared to Saturday. Soggier weather impacts the Northeast.

Have a great weekend!

Gretchen Mishek

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