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A Little Autumn... Sept. Global Temps.

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Updated: 10/08/2013 11:04 pm

Fall is in the air! The remnants of "Karen" will lift off to the north/northeast but there will still be a tight pressure gradient on the system's backside Wed. leading to a day that will begin with low clouds, a cool breeze & some drizzle & light rain. Clouds will be slow to thin as low level moisture will be trapped by an inversion, especially from near I-95 to the coast.

So temps. will be cool all day with northeast winds a steady 15-20 mph. 60s in the morning will only slowly rise into the 70s. It'll be one of the coolest days in a long time. Though we had highs only in the upper 70s as recently as Sept. 28th, the humidity was still very high. Wed. will be a sort of different chill with gusty northeast winds. Since early May, there have only be 2 other days with high temps. as cool as the 70s: (1) June 6th when tropical storm "Andrea" brought heavy rain to the area.... & (2) May 14th.

Inland lows will dip into the 50s Fri. through the weekend with pleasantly warm afternoon highs near or a little above 80 degrees - a beautiful stretch of weather.

As part of an ongoing joint project between UAH, NOAA and NASA, Christy and Dr. Roy Spencer, an ESSC principal scientist, use data gathered by advanced microwave sounding units on NOAA and NASA satellites to get accurate temperature readings for almost all regions of the Earth. This includes remote desert, ocean and rain forest areas where reliable climate data are not otherwise available.

The satellite-based instruments measure the temperature of the atmosphere from the surface up to an altitude of about eight kilometers above sea level. Once the monthly temperature data is collected and processed, it is placed in a "public" computer file for immediate access by atmospheric scientists in the U.S. and abroad.

September temperatures (preliminary)

Global composite temp.: +0.37 C (about 0.67 degrees Fahrenheit) above 30-year average for September.

Northern Hemisphere: +0.34 C (about 0.61 degrees Fahrenheit) above 30-year average for September.

Southern Hemisphere: +0.39 C (about 0.70 degrees Fahrenheit) above 30-year average for September.

Tropics: +0.19 C (about 0.34 degrees Fahrenheit) above 30-year average for September.

August temperatures (revised):

Global Composite: +0.16 C above 30-year average

Northern Hemisphere: +0.11 C above 30-year average

Southern Hemisphere: +0.21 C above 30-year average

Tropics: +0.01 C above 30-year average

(All temperature anomalies are based on a 30-year average (1981-2010) for the month reported.)

Notes on data released Oct. 3, 2013:

Compared to seasonal norms, in September the coolest area on the globe was south of South Africa in the southern ocean, where temperatures in the troposphere were about 2.49 C (about 4.48 degrees F) cooler than normal, said Dr. John Christy, a professor of atmospheric science and director of the Earth System Science Center (ESSC) at The University of Alabama in Huntsville. The warmest area was in the Wilkes Land area of the east Antarctic, where tropospheric temperatures were 5.20 C (about 9.4 degrees F) warmer than seasonal norms.

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