This is going to be one of those grab-bag posts. Sometimes I see things in the news that are weather related, but don’t post immediately about them.There have been a few things like that recently, so here goes.

We’ll start with the drought, and more specifically, the effects on the Atlanta water supply. As Lake Lanier remains at near record low levels, Georgia EPD Director Carol Couch has asked the Army Corps of Engineers to reduce discharges from the lake to create a flow of 650 CFS at Peachtree Creek on the Chattahoochee River. This is similar to a reduction made last spring which, Couch argues, didn’t cause any environmental damage, and would save some 11.7 billion gallons of water.

Meanwhile, Senator Obama has apparently decided that Florida is more important than Georgia, telling potential Sunshine State voters he would side with them when it comes to deciding who gets water from the Apalachicola Chattahoochee Flint river basin. This prompted a quick response from Senators Isakson and Chambliss expressing their disappointment with his comments. It’s another reason to think carefully before you decide to vote for the Chosen One.

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It looks like the worst of Fay has finally left north Georgia, although some counties to the east of Atlanta are having tornado warnings, the tornado watch was just extended until 2 AM Wednesday for much of northeast Georgia and South Carolina, and a flash flood watch remains in effect until 8 PM. We may get a few more showers overnight, but there are bits of blue skies showing. Fay is becoming extratropical, and will move northeast to bother the mid Atlantic states for the next day or so.

Let’s take a look at some of what Fay has done. First of all, Lake Lanier has risen about six inches as of noontime today from where it was early Monday morning. Much of the Lake Lanier watershed received some good rainfall over the past day or two, including Gainesville, with 2.64 inches so far today and .73 inches yesterday and Helen with 4.01 inches over the past two days. I expect Lanier to continue to rise over the next few days as much of the runoff from the storm continues to flow into the lake.

With 2.07 inches of rain today and .99 inches on Monday evening and Tuesday, I’ve recorded 48 hour precipitation of 3.06 inches at my weather station. Today’s rain here is the most in one calendar day since November 15, 2006, when 2.19 inches of rain fell, and as best as I can tell is the most 2 day precipitation since Tropical Storm Cindy came through on July 6-7, 2005, leaving 4.62 inches of rainfall.

My station, which is obviously not official, is on the low end of the rainfall scale. Some other two day rainfall totals include Alpharetta with 5.39 inches, Atlanta Hartsfield with 3.09 inches, Cleveland with 5.14 inches, Cumming with 4.52 inches and Cedartown, with 2.87 inches. It looks like Thomasville, Georgia is going to have the most rainfall from Fay–even beating anywhere in Florida–with a whopping 27.5 inches total precipitation through 2 PM today.

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You may have had heard two pieces of news regarding the drought, and the Atlanta area’s ability to take water from Lake Lanier. The first bit of news is that the metro area has managed to reduce its water use by 20% in June, compared to June 2007. In Gwinnett, recent usage amounts to 77 million gallons per day, compared to 88 MGD a year ago.

While the reduced use probably mostly comes from the outdoor watering ban imposed last fall and modified this spring, it’s still remarkable that Georgians have responded to the crisis as well as they have. Another article I read says that it took residents of Cary, NC 11 years to reduce consumption by 15% in 11 years, and Tampa Bay reduced consumption by 26% in 12 years.

Realistically, though, a more or less total watering ban isn’t going to be a long-term solution to conserving water, unless we want to sacrifice the quality of life afforded by trees, grass and landscaping. More efficient toilets and appliances, less waste through leaky pipes and other techniques will need to be employed to reduce consumption while allowing conservative outdoor use, and that indeed could take years to complete.

The other major story in the news is a promise by a Federal judge that he will decide if Georgia (and the Atlanta area in particular) has the right to withdraw water from Lake Lanier. He views that question as central to coming up with answers to the ongoing water wars between Alabama, Florida and Georgia.

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It looks like we could have a record cold temperature this evening/Wednesday morning.  The current record low for April 30th is 40 degrees set back in 1969.  Forecasters are calling for a low of 36 in Lawrenceville, but only 42 for Hartsfield Airport, so it’s going to be close.  The Weather Service has issued a frost advisory for most of the state north of Macon.

The cold air is caused by Canadian high pressure sweeping into the area following last weekend’s rain.  Usually these cold blasts end around the first of April because developing high pressure off the Atlantic Coast (the proverbial Bermuda High) strengthens enough to counteract the approach of the cold front from the north.  Between this round and the cold weather back in the middle of the month, we’re likely to end April with below normal temperatures for the month.  You can be glad you’re not in Chicago or as far south as West Virginia, which have had a late season snowfall.

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The US Fish and Wildlife Service released its biological opinion today, allowing the Army Corps of Engineers to reduce the water volume flowing into the Apalachicola River from 5,000 cubic feet per second to 4,750 CFS, and later to 4,500 CFS.  The reduced flow levels can continue until June 1st, at which point the situation will be reevaluated.

While the intention of the move is to keep more water in Lake Lanier, officials at a press conference in Atlanta said that the amount of water actually released from the lake on any given day will depend on conditions all along the  Apalachicola - Chattahoochee - Flint river basin. For example, heavy rains along the Flint basin in South Georgia might mean that no water would have to be released from Lanier, but continued dry weather elsewhere would cause the Corps to release additional Lanier water.  The situation is monitored on a daily basis.

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