Do roku 2016 raport oznaczony numerem 1 był tworzony za okres od 1 kwietnia do 31 maja. Od roku 2017 analizy są wykonywane o dekadę wcześniej czyli 1 raport oznacza okres od 21 marca do 20 maja

Communication report regarding the incidences of drought conditions in Poland

Year: 2010; period: 05 (11.V - 10.VII)

In the fifth reporting period, i.e. from 11 May to 10 July 2010, we find a threat of agricultural drought conditions occurrence in Poland. The values of climatic water balance (CWB), on the basis of which the risk assessment of drought is calculated were negative in most Polish areas.

The threat of drought is concentrated in 128 municipalities in the Lubuskie, Wielkopolskie, Zachodniopomorskie, voivodeships. Drought occurs in Lubuskie for spring cereals grown in the soils category I (very light), and soil category II (light). In addition, there is a threat of drought for spring cereals grown on soils category I (very light) in the Wielkopolskie and Zachodniopomorskie voivodeship.

The threat of drought is also present in the cultivation of legumes grown in soils category I in areas of Lubuskie voivodeship.

The May temperature in eastern Poland was higher than the long-term average by 1°C. In central Poland, it was within the norm, and in the western parts below the norm by 2-3°C.

The June temperature varied from 14°C in the north to more than 18°C in the east of the country.

In the first ten days of July, Poland in terms of heat was also very diverse, ranging from high temperatures in the north-west, where the average exceeded 22°C, which was relatively low in the south-east (17.5°C).

In the second ten-days of May across the country, very heavy precipitation in the south was experienced up to 400% above the norm. The highest monthly precipitation was recorded in May in southern Poland, ranging from 200 to 400 mm, representing 200 to 400% of the norm. The precipitation in the western parts of the country were normal or only slightly above it.

Large variations were found in terms of precipitation in June. The south-east experienced a very high precipitation in many places exceeding 150 mm and 200 mm. However, in the north-eastern part of Poland, precipitation was normal and ranged from 60 to 80 mm in the north and from 20 to 40 mm, about 50% below normal. In the west of the country, low precipitation was experienced of 5 to 20 mm, much lower than long-term norm.

In the first ten-days of July in Poland, the precipitation was varied. The highest precipitation exceeding 50 mm occurred on the east and south-east. In the west of the country, the precipitation ranged from 10 to 20 mm. Low precipitation (a few mm) occurred in central, north-east, and southern Poland in: Wielkopolskie, Mazowieckie, Dolnoslaskie, Opolskie, Slaskie, Kujawsko-Pomorskie, Warminsko-Mazurskie, and Lubelskie (northern- western parts).

Thereafter in the sixty-day period, a continuous decline in the CWB was noticed. In most of the Polish area, CWB values compared to the fourth reporting period decreased by 60 ÷ 100 mm. A smaller decline in the value of CWB from 10 to 30 mm occurred in the east of the country.

The CWB value was still very diverse in Poland. The lowest values CWB were found in the north-western part of the country (less than 100 mm), and especially in the northern part of the Lubuskie voivodeship and in south-western part of the Zachodniopomorskie and in the western part of Wielkopolskie (-160 ÷ -179 mm). A large water deficit also occurs on the border of Lubelskie and Mazowieckie (-80 ÷ -99 mm).

Heavy precipitation continued in May and June in the southern parts of the Slaskie, Malopolskie, and Podkarpackie voivodeships, and are quoted with a very high value of CWB (over 100 mm) and in some places even more than 200 mm.