The term the “Dog Days of Summer” first arose in Greek and Roman times when it was known as the “caniculares dies.” It marked the period between late July and late August when Sirius, the Dog Star, rose concurrently with the sun. It has nothing to do with “sweating like a dog” which is fortunate because if used in this context, it would be terribly inappropriate in the summer of ’09. After last week’s near nation-wide warm-up and freak heat-wave in the Pacific Northwest, temperatures will return to the same boring and near-to-below-normal weather we have come to enjoy for most of the summer.
As such, cooling demand will likely fall as well. After last week’s warm-up, the Northeast and Mid-Atlantic will cool between 10 and 30 CDDs over the Sunday-Friday period to near average or slightly below average for this time of year. The Pacific Northwest, after last week’s record-setting heatwave, will cool to near, or slightly above average. Hitting the jackpot in the cooling lottery will be the Valley of California, which will see temperature drops of nearly 40 CDDs, taking daily highs from the mid 90s to the mid 80s.
The only areas experiencing a warming trend will be the Southeast which will rebound by up to 20 CDDs to near normal. Areas near the Great Divide in the Mountain West will see the greatest rally, of up to 30 CDDs.
Overall, this week will be marked by a return to equilibrium: last week’s warm areas, cooling; last week’s cool areas, warming.
Total forecasted CDDs for the upcoming week are shown below in Figure 1 while the week-over-week change is shown below in Figure 2.
Figure 1: Projected Cooling Degree Days (CDDs) for the upcoming week.
Figure 2: Week-over-week change in Cooling Degree Days
With 6428 population-weighted CDDs, this week looks to be the third hottest (or, third coolest) out of the six weeks of summer we have experienced so far. Last week was the hottest overall with 7102 CDDs while the week of June 26th with 5545 CDDs was the coolest. Overall, population-weighted CDDs will fall 867, or 11.9% from last week. Based on this data, I project a natural gas injection of +61 BCF for the EIA Supply Report to be issued on August 13. This compares to a five-year average of +56 BCF and last year’s injection of +50 BCF. Relevant numerical data is shown below in Table 1.
Table 1: Numerical Cooling Degree Data
Region |
This Week’s Population-Weighted Cooling Degree Forecast |
Numerical Change From Last Week (Percent Change) |
Projected Natural Gas Injection (Inventory Report: August 13) |
East |
3442 |
-767 (-18.2%) |
+54 BCF |
Producing |
1658 |
+69 (+4.3%) |
+7 BCF |
West |
1327 |
-168 (-11.3%) |
-1 BCF |
U.S. Total |
6428 |
-867 (-11.9%) |
+60 BCF |
.
Based on last week’s warm weather, I project that this week’s injection will be +57 BCF. This compares to a five-year average of +42 BCF and last year’s injection of +56 BCF.
Projecting such above-average injections for the next two weeks gives me no desire to increase my natural gas stake. Ordinarily, the below average temperatures would make me want to get short gas, while the falling rig count and and upcoming hurricane season would make me want to get long(er). Ergo, I do nothing.
The Tropics: Welcome to August
Bienvenidos. Now that August has arrived, we can expect tropical activity to pick up precipitously. Figure 2 below shows that tropical cyclone frequency ramps up beginning the first week of August.
Figure 3: Tropical Cyclone Frequency showing a rapid increase in activity beginning in August.
The last nine years in a row have seen a storm form during the first half of August. In six out of those nine years a storm formed during the first week of August. Climatologically favored areas of development for early August include the Gulf of Mexico, the Western Caribbean, the western half of the Tropical Atlantic.
Broadly speaking, the level of tropical activity for the next month will depend on the three factors discussed below.
El Nino: This is the guy that is sticking the control rods into the figurative tropical nuclear breeder reactor. El Nino is the warming of the eastern Equatorial Pacific, resulting in increased wind-shear across the Atlantic. Right now, temperatures are averaging roughly 1.4 F above normal in the Eastern Pacific, a mild El Nino event on the cusp of becoming a moderate one should the warming reach 1.8 F. There are no signs of this warming trend abating. El Nino will likely suppress tropical activity and I am confident that we will see a below-average number of storms during the rest of the season. But let’s not go overboard. I have seen forecasts from semi-reputable sources now calling for under 5 storms. This is rediculous. During the last strong El Nino, 1997, we still saw 8 named storms and that was a far stronger El Nino. I still expect we will see 10 named storms, at least.
The late start to the season can at least partly be attributed to El Nino since wind shear has been very high thus far, particularly in the Caribbean. Since the western Caribbean is climatologically a hot spot for development in July, this has put the kaibash on any early-season development. Several strong waves entering the Caribbean last month would likely have otherwise developed had they not been mutilated by the wind shear.
Ocean Temperatures: While ocean temperatures started out the summer substantially below levels observed in recent years (though still above average), they have rebounded in the last month to average about 1.0F above long-term averages. Ironically, this is due to weakness in the Bermuda High, which has allowed the Jet Stream to dive southward in the East to give us all of the cold weather we have been experiencing. However, this same weakness has slackened the prevailing winds which normally mix up the upper half of the ocean bringing cooler water to the surface. This has therefore allowed to temperatures to warm a more rapid than normal rate. These temperatures allow for more intensification should a storm develop.
Saharan Dust: Sand storms over the Sahara Desert throw up dust that is dumped over the eastern Atlantic by the prevailing winds. Accompanying the dust is very dry air that squeezes moisture from the atmosphere, squelching development. In a tag team effort with the wind-shear in the Caribbean, bountiful quantities of Saharan dust off of the African coast have taken care of several promising waves moving off of Africa.
However, sand storms are at their peak in May, June, and July and thus we can expect levels of dust to gradually decline over the next few weeks
The Tropics Today
Currently, there are no imminent areas of development. Most of the Atlantic is dominated by a pair of upper level lows that is precluding any tropical development. A strong wave has recently moved off the western coast that appears to have some spin associated with it. This wave is shown below in Figure 4.
Figure 4: The Tropical Atlantic and African Wave
It will need to be watched to see if it can survive the dry air and Saharan dust to its north. The GFS computer model is showing some signs of developing the system in the next 48-72 hours. Climatologically, systems this far east this early in the season tend to recurve away from land. Regardless, we will have a very long time to watch it. Overall, I give a 25% of seeing development in the next seven days.
In other tropical news, Tropical Storm Lana is currently passing roughly 500 miles south of Hawaii and weakening. Beyond enhancing the surf and increasing the chance of afternoon showers and thunderstorms, Lana will have no direct impact on the island chain.
Should you feel the season is doomed, see my post on investing on a lack of hurricanes. Otherwise, hang in there, August is here.
Note: Major Karma Points to the first person to correctly identify the hurricane shown at the top. This is going to be a common theme of posts for the foreseeable future. A small hurricane warning flag will be awarded to the individual with the most points at the conclusion of the hurricane season, provided that they have at least 12.
Double points last post. Wabisabi picks one up for getting Jeanne, while TraderCaddy gets one for mentioning twin-sister Frances.
1. Wabisabi-8
2. DPeezy-6
3. Yogi and Boo Boo-2
4. TraderCaddy-1
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