UV Index in the Red: 5 Rules for the Next Three Days

Why does the sun feel more punishing this week than last, when the thermometer reads much the same? Because of ultraviolet radiation rather than the temperature itself. The Republic Hydrometeorological Institute, known in Serbia as RHMZ, has shaded the entire country red for Wednesday, July 29, and that is the part of the forecast most people skip past on their way to the daily maximum.

The institute’s own map carries index values of 8 and 9, while some outlets are quoting a range of 8 to 10. The gap between those numbers does not change the practical point: these are levels at which protection is advised, not an ordinary summer day.

In its UV forecast, RHMZ describes “the whole country coloured red, with indices of 8 and 9, which fall into the category of very dangerous phenomena”.

Where is the radiation strongest?

The highest UV values are forecast across much of the country. Among the places named by the service are Loznica, Valjevo, Smederevska Palanka, Veliko Gradiste, Negotin, Kraljevo, Krusevac, Cuprija, Nis, Dimitrovgrad, Leskovac, Prizren, Pristina and Vranje, along with mountain stations including Kopaonik, Zlatibor, Sjenica and Crni Vrh.

Wednesday itself is sunny, with lows of 12 to 19 degrees and highs of 31 to 35, under a light to moderate easterly wind. Belgrade wakes up around 19 degrees and peaks near 33. On paper, still manageable.

The alert calendar, with red arriving Friday

The heat side of the forecast tightens day by day:

• Wednesday, July 29, yellow alert across most of Serbia, orange for Backa, Banat and eastern Serbia
• Thursday, July 30, orange nationwide, highs of 33 to 36 degrees, 35 in Belgrade
• Friday, July 31, red, the highest level, highs of 35 to 38 degrees, 37 in Belgrade
• Saturday, August 1, locally up to 40 degrees, 38 in Belgrade

Then there is the figure that rarely makes the headlines. Thursday’s heat stress index ranges from 38.1 to 40 degrees and locally climbs above 42. At that level the body stops shedding heat the usual way, and the risk shifts from discomfort to a medical problem.

We covered the wave itself yesterday, when the institute announced roughly two weeks of heat. What is new is the alert calendar, plus an RHMZ warning that stretches through the first ten days of August, with maximum temperatures mostly above 35 degrees and locally above 40. The sharpest stretch runs from August 5 to 8.

Nights bring little relief, and the institute says so plainly:

“In urban areas, tropical nights are forecast with minimum temperatures of 20 to 24°C, and in Belgrade of 22 to 26°C”

When the temperature never drops below 20 degrees, the body has no window to recover from the day, and the fatigue carries into the next one.

Five rules while the UV index stays red

The RHMZ biometeorological forecast advises avoiding the sun during the hottest part of the day, from mid-morning until late afternoon. A few concrete steps go with that advice while the red UV alert holds:

• schedule anything outdoors before 10 in the morning or after 5 in the afternoon
• high factor sunscreen, reapplied after sweating or swimming
• a brimmed hat and sunglasses with a UV filter
• a bottle of water on you, even for a short errand
• shade whenever there is a choice, particularly around midday

The service also flags the risk of heat cramps, exhaustion and heatstroke, above all for people with chronic illnesses, those sensitive to weather changes and anyone on regular medication. If someone in your family fits that description, the next three days are reason enough for a daily phone call.