19 July 2011


(Smoke from the Wallow Fire as seen in Albuquerque. Credit: John Fowler via Wikimedia Commons.)

We're seeing records fall in all directions this year—wettest, driest, warmest, coldest, snowiest, stormiest, fieryist—across the globe. 

In the US alone, in the month of July alone, 1,079 total heat records have been broken or tied. That's 559 broken, 520 tied... so far.

(Credit: NOAA.)

The map above, generated at NOAA's US Records page, shows how records have fallen nationwide, including in Alaska and Hawaii.
In fact every state except Delaware has broken heat records so far this month.

In Iowa yesterday the heat index exceeded 130°F/54.4°C—an extremely rare occurrence in this part of the world. According to Jeff Masters, writing at his Wunderblog, the only place where a 130°F heat index is common is along the shores of the Red Sea in the Middle East.

(Predicted heat index for Friday, 22 July, 2011. Credit: NOAA.)

However, Delaware won't dodge the heat bullet much longer. Its own records will likely tumble hard later this week.

The image above shows the predicted maximum heat index (combined heat and humidity) for Friday, 22 July 2011. 

Parts of all but 3 states—Washington, Oregon, Idaho—are predicted to exceed 100°F/37.7°C.

Delaware—in scary yellow—is predicted to rise above 115°F/46.1°C.

Ricky Rood points out in his Weather Underground blog that much of July's heat in the US is compounded by extremely high humidity.

And much of the extreme humidity this year is fueled by the extreme floods and saturated soils still plaguing the Midwest.

(Missouri River basin. Top image acquired yesterday, 18 July 2011, shows flooding. Compare to bottom image acquired a year ago, showing no flooding. Credit: NASA Earth Observatory courtesy MODIS Rapid Response Team, Goddard Space Flight Center.)

Extreme humidity combined with extreme heat creates extreme consequences for human health. As Ricky Rood writes:

Now if I was a public health official, and I was trying to understand how a warming planet might impact my life, then here is how I would think about it. First, the Gulf of Mexico and the Pacific are going to be warmer, and hence, there will be more humid air. This will mean, with regard to human health for the central U.S., heat waves will become more dangerous, without necessarily becoming hotter. It is also reasonable to expect heat waves will become more frequent and last longer, because those persistent, stuck high pressure systems are, in part, forced by the higher sea surface temperatures. If I am a public health official here is my algorithm—heat waves are already important to my life, and they are likely to get more dangerous, more frequent, and of longer duration.

In other parts of the country this year the extreme heat is compounded by extreme drought—with its own extreme outcomes... including the haboob that struck Phoenix on 5 July 2011. The time lapse video is amazing.

From Christopher Burt's weatherhistorian blog:

The drought in the south central and southeast of the United States reached epic proportions. Carlsbad, New Mexico went 233 days with no measurable precipitation until a meager 0.01" fell on June 2nd and it has not rained again since (as of July 15th). Pecos, Texas just received 0.02" of precipitation on July 14th, its first measurable amount since September 23, 2010 (293 consecutive dry days). Albuquerque, New Mexico has only had 0.19" of precipitation since January 1st (as of July 15th).For the period of January through June this year has so far been the driest on record (117 years) for the states of New Mexico, Texas, and Louisiana.

(Credit: David Miskus, NOAA/NWS/NCEP/Climate Prediction Center.)

The above image shows the latest drought conditions in the US where "exceptional" drought is plaguing much of the south. The trend is worsening, as you can see in this 12-week animation.

Another way of looking at this map is to realize the dark red areas are places where crops are going to fail this year.

(Fire maps. Credit: Jacques Descloitres. Fire detection algorithm developed by Louis Giglio. Blue Marble background image created by Reto Stokli.)

Of course drought fuels wildfires too. 

Arizona and New Mexico both experienced their largest wildfires in history during June and July.

In the image above you can see the global fire situation between 30 June and 9 July. As bad as the fires in the US, obviously, they're a whole lot worse elsewhere.

(Las Conchas Fire. Credit: John Fowler via Wikimedia Commons.)

According to the National Interagency Fire Center, the number of wildfires in the US as of the beginning of July this year is 36,424... and counting.

These wildlands blazes have burned 4.8 million acres/1.9 million hectares. That's an average of 132 acres/53.4 hectares per fire.

Which by the way is the largest burned acreage ever recorded in the US during this time period.

(Credit: NASA Earth Observatory image by Jesse Allen, using data provided by the AIRS science team at NASA/JPL.)  

Where there's fire, there's carbon monoxide. 

The images above show high concentrations of carbon monoxide from Arizona's Wallow Fire drifting across the US from June 3-6. Highest concentrations are in dark red. As described by the Earth Observatory:

Carbon monoxide is a colorless, odorless gas that damages human health by limiting the flow of oxygen through the body. It is also a key ingredient in the production of harmful ground-level ozone and urban haze.

(Credit: NOAA's HMS analysis.)

Today's mega-smoke producers are found in eastern Manitoba and central Ontario.

In the image above you can see the moderate-to-dense smoke plume crossing the border.

(Credit: The US Air Quality Smog Blog.)

And where there's smoke, there's particulate.

You can see above how Canada's wildfires are driving today's poor air quality (yellow dots) in the Great Lakes region.

(Thick smoke from drought- and heat-ravaged Canada streams south towards US. Wildfires outlined in red. Credit: Jeff Schmaltz, NASA Earth Observatory, MODIS Rapid Response Team at NASA GSFC.) 

Alone, heat, humidity, or smoke are lethal. Combined, they're a juggernaut.

In Russia last year, a combination of extreme heat and extreme smoke from wildfires killed an estimated 56,000 people.
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