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: 09 (21.VI - 20.VIII)

In the ninth reporting period, i.e. from 21 June to 20 August 2010, we have found a risk of agricultural drought in some areas of Poland.

The values of climatic water balance (CWB), which the drought risk assessment is calculated on, were negative in most of the country.

However, a threat of drought has occurred in 70 local districts, representing 2.3% of Polish local districts that covers 0.4% of the total surface area of the country. There are local districts located in the Lubelskie voivodeship (43 local districts) and Mazowieckie voivodeship (27 local districts), which occupy respectively 3% and 0.7% of the surface soil of these regions.

A threat of drought occurs for legumes grown on soils of category I. Those are very light soils, and are very susceptible to drought, a granulometric group: loose sand, loose sand, dusty, sand, and loamy sand, slightly loamy sand.

July has been one of the warmest months since the beginning of the last century. The highest temperature occurred in Wielkopolska (above 22°C); a slightly lower temperature was in central Poland (21-22°C) and about 20°C for the rest of the country. Throughout Poland, the temperature has significantly exceeded the standard value for the past three decades from 1971 to 2000. In Podlasie, Warmia, and Mazury, Wielkopolska and Lubuskie there was an increased value by more than 4°C, the rest of the country was found to be between 3 - 4°C. Lastly, a 2.5 - 3°C temperature value exceeded the standard in a small area of the coastal and southern parts of the country.

The first 20 days of August was very warm. The highest average temperature (above 21°C) in the 20 day period occurred in the eastern parts of Poland, while the lowest, not exceeding 19°C were in the western and southern-western parts of the country.

In July, we found a large variation of precipitation. The highest precipitation, exceeding 300 mm, occurred in the south and southern-eastern parts of the country (160-200% of the long-term norm). High precipitation occurred in the Opole and Dolny Slask regions (120-150 mm, i.e. approximately 150% of norm), with significant levels of precipitation in Klodzka Kotlina (over 180 mm, i.e. 160-200% of the long-term norm), as well as in a broad band (about 100 km) from Ustka to Torun (120-140 mm, 160-180% of the norm). However, in Warmia and Mazury, eastern Mazowsze, and the in the northern parts of the Lublin region the precipitation was low (50-70 mm), 50-80% of the long-term norm.

In the first 20-day period of August, a large variation in the amount of precipitation had occurred. In both periods, there has been high precipitation in the western part of Poland, in places exceeding 100 mm. Low precipitation, not exceeding 20 mm, occurred in the northern-eastern and southern parts of the country (in the first ten-days of the month), and the southern -eastern (in the second ten-days of the month).

The CWB values were negative for almost all of the country; however, there was an increase of CWB for the southern regions of the country. The average increase of CWB in comparison to the eighth reporting period was 15 mm. The highest growth over 60 mm was recorded in the Szczecin Lowlands and the Lubuskie region (around Slubice up to 140 mm).

Poland still has a very diverse value of CWB. The lowest values of CWB occur in the northern parts of Lublin and in the southern part of the Mazowieckie voivodeship (-120 ÷ -139 mm). A large water deficit also occurs in the Wielkopolska voivodeship (-110 ÷ -129 mm). Positive values of CWB (20 ÷ 70 mm) are noted continuously in the southern parts of Dolnoslaskie, Slaskie, Małopolskie, and Podkarpackie voivodeship.