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: 06 (21.V - 20.VII)

In the sixth reporting period, i.e. from 21 May to 20 July 2010, we find a threat of agricultural drought conditions 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 occurs in 390 municipalities, in relation to the previous reporting period it has increased by 262 municipalities. Drought occurred in the regions of Wielkopolska (193 municipalities), Lubuskie (71 municipalities), Kujawsko-Pomorskie (67 municipalities), Zachodniopomorskie (58 municipalities) and Pomorskie (one municipality). Five percent of the country was under a threat of drought.

The crops that were under the most threat of drought risk were spring cereals, winter cereals, potatoes, hops, tobacco, vegetables, fruit shrubs, fruit trees, strawberries, legumes.

Drought occurred for groups and plant species grown in soils of category I (very light, very susceptible to drought), a granulometric group: loose sand, loose sand, dusty, loamy sand, weak, loamy sand, slightly dusty.

In June, the temperature in the eastern parts of Poland, in the Malopolska and Wielkopolska regions was higher than the long-term average over 1°C; the rest of the country was close to the long-term average. The heat for the first ten days of July in Poland was found to be very diverse, ranging from high temperatures in the north-west, where the average exceeded 22°C, in comparison to relatively low temperatures in the south-east (17.5°C). The second ten days were very warm throughout the country, especially in its central part. The highest temperature was above 24°C throughout almost the entire Kijawsko-Pomorskie region, and in the eastern part of Wielkopolska and central parts of Mazowieckie. The rest of the Poland had also high air temperature exceeding 22°C.

In the last ten-days of May, a considerable amount of high precipitation occurred in the south of the country, causing flooding of many catchment areas in the upper tributaries of the Vistula and leading to the breeching of the flood banks of the river in central areas.

June experienced very high precipitation in the south-eastern parts of country, in many places it exceeded 150 mm and 200 mm. However, in the north-eastern part of the country precipitation was normal and ranged from 60 to 80 mm, and the north 20 to 40 mm, i.e. about 50% below the norm. In the western parts of the country, there has been low precipitation from 5 to 20 mm (10 ÷ 30 of norm). In contrast, the lowest precipitation occurred in the Lubuskie (from 3 to 10% of norm).

In the first ten-days of July, Poland was diverse in terms of precipitation. The highest rainfall exceeding 50 mm occurred on the east and south-east of the country. In the west, precipitation ranged from 10 to 20 mm. By contrast, in central Poland, north-east and south, in the regions of Wielkopolska, Mazwsze, Dolnoslaskie, Opolskie, Slaskie, Kujawsko-Pomorskie, Warmia, and Mazury and in the north-western parts of Lubelskie precipitation reached only a few mm.

The second ten-days of July were also very diverse in terms of precipitation, which ranged from 100 to 130 mm in the Klodzka Valley, 40 to 60 mm in the western parts of Dolnoslaskie and Podlasie, to very low precipitation (2 ÷ 15 mm) in the Zachodniopomorskie and in the northern part of the Wielkopolska and Lubelskie. In other parts of the country, there were areas with high precipitation from storms, as well as other areas with low precipitation.

CWB values are negative in almost the whole country, except in the southern Polish regions. Poland also recorded a further decline in the value of CWB. The average decrease in CWB compared to the fifth reporting period amounted to 90 mm, while the highest fall, over 200 mm was recorded in the south of the country, and in the vicinity of Bielsko-Biala, even over 350 mm. In areas where storm rainfall occurred, the decrease of CWB was smaller and ranged from 5 to 30 mm.

Poland is still very diverse in terms of the value of CWB. The lowest CWB values occurred in the northern part of the Lubuskie and in the central part of the Wielkopolska (-220÷ -239 mm). Large water deficit also occurs in the following regions: Zachodniopomorskie, Kujawsko-Pomorskie, Pomorskie (-160 ÷ -199 mm) and continue on the border and Lubelskie Mazowieckie (-160 ÷ -189 mm).

CWB positive values (30 ÷ 70 mm) are still listed in the southern parts of Dolnoslaskie, Slaskie, Małopolskie, and Podkarpackie, where heavy rainfall occurred in the third part of May and June.