Thursday, July 8, 2010

Tropical Depression #2 Update Thursday


Tropical Depression #2 continues to be very disorganized with maximum sustained winds at just 35 mph. The center, as best the hurricane reconnaissance can determine, is just off the south Texas coast.
It is expected to move inland this afternoon and weaken over the next 24 hours, but drop about 4" to 8" of rain on saturated parts of southern Texas that already received ample rain from Hurricane Alex about a week ago. It does not appear likely that TD #2 will be able to strengthen enough to Tropical Storm strength (must have maximum sustained wind speeds of at least 39 mph with an organized center) and be named Bonnie. Bonnie is yet to be...but there's plenty more of the season to get through:
(Image: Atlantic Tropical Season Activity)

Drought Conditions in Virginia


The latest Drought Monitor, just released this morning, confirms what most of us in Virginia already know. We are in the beginnings of a drought. The first level of drought (Moderate) is now affecting about 35% of the state, with nearly everyone else at least abnormally dry. Here is the departure from normal soil moisture for the country, and you can see that we are not the only ones running below average for our precipitation. From the Mid-Atlantic through New England, the same region impacted by the triple-digit heat wave this week, are all badly in need of significant rainfall.
At Richmond International Airport, we are 4.66" below average for our year-to-date precipitation. In the last 40 days, we have received less than an inch of rainfall, none so far in July. March was the last month we were on track for rainfall. We've been below-average for precipitation since April. You can see how our gap has been growing since mid-April:

But we do have a couple things going for us the rest of this Summer in the Mid-Atlantic. For one, we tend to get air-mass thunderstorms often in the summertime. As long as we can stay humid enough, we should get these pop-up showers and storms regularly. Also, we are only in the beginning of our Atlantic tropical season, which will peak September 10 and carry us all the way through November. In Virginia, about 10%-40% of our rainfall in September alone is a result of tropical systems or their remnants. So between summertime storms and an above-average tropical season still expected, we should be able to prevent the drought from becoming a long-term event. In the short-term, though, expect conditions to get worse before they get better.