WEATHERAmerica Newsletter, Saturday, June 28, 2025; WEATHER HAZARDS And GLOBAL SATELLITE IMAGES

[Larry Cosgrove]

TODAY'S FUN LINK:

The Eruption Of Mount Tambora, The 1815 Disaster That Led To The ‘Year Without A Summer’

 

WEATHER HAZARDS (During The Next 24 Hours)

 

SEVERE WEATHER OUTLOOK
(potential for tornadoes, damaging winds, and large hail within the next 24 hours)

 

ISOLATED Severe Thunderstorms

(Microbursts, Large Hail, Isolated Tornadoes)

NE KS....E KS....W IA....SE SD....C, S MN....N, C WI....MI Upper Peninsula....ON Soo Locks Area

Some Thunderstorms May APPROACH Severe Limits

Coastal TX, LA, MS....AL....FL....GA....TN....SE MO....KY....WV....MD....DC....VA....NC....SC

Some Thunderstorms May APPROACH Severe Limits

NM, CO, WY Front Range

 

HEAVY RAINFALL OUTLOOK
(potential for an inch or more total rainfall within the next 24 hours)

 

Isolated Locations In

NE KS....E KS....W IA....SE SD....C, S MN....N, C WI....MI Upper Peninsula....ON Soo Locks Area

(QPF 1 - 3")

Isolated Locations In

Coastal TX, LA, MS....AL....FL....GA....TN....SE MO....KY....WV....MD....DC....VA....NC....SC

(QPF 1 - 2")

 

EXCESSIVE HEAT RISK

(Potential For Temperature To Exceed 95 deg F)

 

Scattered Locations In

CA....OR....C, S ID....SW MT....WY....CO....UT....NV....AZ....NM....TX....OK....KS....NE....IA....MO....AR....LA....MS....AL....FL....GA....SC....NC....VA....DC....DE....NJ....S PA....WV....OH....MI....WI

IL....IN....KY....TN

GLOBAL WEATHER SUMMARY

(a review of important weather features around the world)

 

IODC

ECMWF; METEOBLUE; EUMETSAT

 

Brutal isn't it?

The monster heat ridge complex over Saudi Arabia and Iran is actually in a bit of a weakened state. A monsoonal impulse has nudged westward toward the Strait Of Hormuz, allowing for some cloudiness and thunderstorms across the northwestern portion of the Arabian Sea. Mind you, it is still extremely hot, but the inclusion of mid-level moisture will at least bump temperatures down a few points in the lower Indus Valley into the eastern provinces of Persia. But that disturbed area is sure to weaken as another cold low progresses into western and central Russia. 500MB heights will increase radically and lock in between the Zagros and Alborz ranges by next weekend, boosting chances for 50 deg C readings north and west. There may be degradation of the power grid as far afield as Turkey and the Central Asian Republics by July 8.

 

HIMAWARI 8

METEOBLUE; Kochi University

 

Once again, the Madden-Julian Oscillation is incoherent. And this time, remarkably so. The Asian monsoon has weakened as well, but should regroup and enhance rainfall across India, southern Pakistan up into eastern China and Japan. There may be potential spots for tropical cyclone development in the western and central equatorial Pacific Basin.

Cold frontal passages are much more vigorous in Australia and New Zealand. Cool air with some Antarctic properties may reach as far northeast as Oceania.

 

GOES WEST

NOAA/NESDIS

 

A tropical storm is forming off of the Pacific shoreline of Mexico. This feature may hamper development of TD 2 in the Bay of Campeche. The ITCZ remains impressive over the equatorial zones but may be showing signs of weakening, and in the process lessen chances for widespread moisture into the Mexican monsoon. The broad and powerful cold Gulf of Alaska Low will send out three impulses in the polar jet stream through southern Canada during the next ten days. Chance for thunderstorms and cool intrusions north of the International Border.

 

GOES EAST

NOAA/NESDIS

 

A weak frontal structure from Kansas and Missouri into the Mid-Atlantic has brought only marginal, and temporary relief from the hot and humid conditions that have plagued those regions during the past week. The reformation of the heat ridge will return very high temperatures to much of the lower 48 states over the next ten days.

Note Tropical Depression 2 in the Bay of Campeche, which may target northeastern Mexico or far South Texas in the next 72 hours. See also the tropical wave in the Lesser Antilles, the first impulse ejected from the African ITCZ this season.

We continue to see strong storms and cold fronts move out of the Antarctic waters into Chile, Argentina, and southern Brazil. The northern third of South America remains hot and now mostly dry as the ITCZ is shifting to higher latitudes.

 

METEOSAT

ECMWF; METEOBLUE; EUMETSAT

 

Yes, you can call the temperature pattern across much of Europe a heatwave. The northern edge of the hot/dry Saharan realm has reached the middle of The British Isles, and it should be above normal for temperatures in the southern half of Great Britain through Tuesday. But as always since early spring, the march of troughs and cold fronts from the Atlantic Ocean will knock readings down over the northern half of the subcontinent. The heat ridge across the western Mediterranean Sea will be forced eastward, and in time the highest values over the Iberian Peninsula will expand and perhaps link with the fearsome Arabian/Persian subtropical high. That will put the Italian, Balkan, and Anatolian Peninsulas in line for record hot weather for much of the first two weeks of July.

Hot North/stormy Middle/hot South is an apt description of weather across the African continent, with a hyperactive ITCZ sandwiched between the Saharan and Kalahari heat ridge complexes. Rainfall forecasts, with cases of severe weather, are extremely high from Eritrea and Somalia westward to the Cape Verde Islands. Note the convective circulation over Guinea/Bissau.