Tue. was our 6th straight day 90+ with heat indices 100+, but let's face it: IT'S AUGUST! Since it's been a mild summer so far, I suppose the temps. do feel somewhat oppressive, but it's far from records + changes are just around the corner.
First of all.....
Thunderstorms will begin to increase Wed. & especially Thu., Fri. & Sat. The stormy pattern -- that will include periods of very heavy rain & lots of lightning + a few strong to severe storms -- will be courtesy 2 primary features:
(1) a weak cool front dropping south thanks to yet another rather unseasonable dip in the jet stream. This will result in morning to midday storms forming west of Jax then spreading east/northeast across much of the First Coast.
(2) tropical moisture surging north from the Caribbean. We'll have the potential for rainfall rates of 2"+/hour!
There will be enough sun long enough to make Wed. yet another scorcher with temps. well into the 90s before storms develop. But Thu. through Sat. will not be as hot thanks to an increase in clouds & rain. Highs will still reach the mid to upper 80s & high humidity will make it very uncomfortable despite the lower actual (air) temp.
we need to monitor the tropics. A large slug of moisture is tied to a weak/disorganized tropical wave over the NW Caribbean will stream northward. The moisture alone will increase rainfall, but we'll also have to watch for possible tropical development -- a depression or even tropical storm -- that will move over the Gulf of Mexico. Early indications are that this wave -- or possibly a tropical cyclone -- will come ashore late Fri. or early Sat. between New Orleans & the Fl. Panhandle. For updates, go ** here ** -- "Talking the Tropics With Mike".
As part of an ongoing joint project between UAHuntsville, NOAA and NASA, Christy and Dr. Roy Spencer, an ESSC principal scientist, use data gathered by advanced microwave sounding units on NOAA, NASA and EUMETSAT 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.
July temperatures (preliminary)
Global composite temp.: +0.17 C (about 0.31 degrees Fahrenheit) above 30-year average for July.
Northern Hemisphere: +0.13 C (about 0.23 degrees Fahrenheit) above 30-year average for July.
Southern Hemisphere: +0.22 C (about 0.40 degrees Fahrenheit) above 30-year average for July.
Tropics: +0.08 C (about 0.14 degrees Fahrenheit) above 30-year average for July.
May temperatures (revised):
Global Composite: +0.30 C above 30-year average
Northern Hemisphere: +0.33 C above 30-year average
Southern Hemisphere: +0.26 C above 30-year average
Tropics: +0.22 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 August 5, 2013:
Temperatures in the tropics cooled to near seasonal norms in July, 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.
Compared to seasonal norms, during July the coldest area on the globe was off the coast of East Antarctica near the Ross Sea, where the average temperature was as much as 3.89 C (about 6.99 degrees Fahrenheit) cooler than the Antarctic’s winter seasonal norms. Compared to seasonal norms, the “warmest” area on the globe in July was off the coast of Chile in the South Pacific Ocean, where temperatures were as much as 2.31 C (about 4.16 degrees Fahrenheit) warmer than seasonal norms.