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: 04 (1.V - 30.VI)

In the fourth reporting period, i.e. from 1 May to 30 June 2010, there was no occurrence of agricultural drought conditions in Poland. The climatic water balance values (CWB), on the basis of which the risk assessment of drought is calculated was negative in most Polish areas but higher than the critical value.

The temperature in May was higher than the long-term average in eastern Poland by 1°C. In central Poland was normal, and in the western parts below the norm by 2-3°C. In the first ten days of June, a mini heat wave hit Poland, for several consecutive days the maximum temperature was above 30°C. The second decade of June in terms of heat was very diverse, ranging from high temperatures in the southeast, where the average exceeded 18°C and a low in the northwest (13°C). The temperature of the third ten days of June was less diverse, the highest temperatures were in western Poland 17-18.8°C and lowest in the north, south and south-east of the country from 15 to 17°C.

In May, especially in the second ten day period, the entire country experienced very high precipitation, and in the south, this was up to 400% above normal. The highest monthly precipitation was recorded in May in southern Poland and ranged from 200 to 400 mm, extremely heavy precipitation occurred in Bielsko-Biala (511.5 mm) in excess of 500% long-term norm. It should also be noted that precipitation in the west of the country was normal (West region) or only slightly above it.

The large variation in precipitation was found in the first ten days of June. The south-east experienced very heavy precipitation in many places exceeding 100 mm, and in places up to 150 mm. However, in the central Poland had normal levels of precipitation and in the north of the country it was even below the norm.

In the second ten days of June the precipitation were very different. The south parts of the country have experienced heavy precipitation in excess of 40 mm in many localities, and in some places up to 60 mm. A similar level of precipitation occurred in Podlasie, Warmia, and Mazury. However, in many areas in the western parts of the country precipitation did not occur or was very small, not exceeding 2 mm.

In the third part of June Poland in terms of precipitation was also diversified. In the western parts of the country precipitation did not occur or was small (a few mm), also in the Lubelski region very little precipitation occurred. Mazosze, Warmia and Mazury, and Podlasie precipitation ranged from 10 to 20 mm. The highest precipitation exceeding 50 mm occurred in the South parts of Mazowieckie, Swiętokrzyskim, and Malopolskim Voivodeships.

Thereafter in the sixty days period the CWB continues to decrease. Relative to the third reporting period in most areas of the country the CWB values decreased by 10 to 50 mm, mainly in the western part of the country and on the coast. The decline did not cause the risks of agricultural drought understood in accordance with the Low of the Minister of Agriculture and Rural Development. However, in Warmia, Mazury, Malopolska, and Lubelskie, the KBW value increased by 5 to 25 mm.

Poland the in case of a CWB value is very diverse. The lowest values of CWB occurred in the northern part of the Lubuskie voivodeship and south-western part of the Zachodniopomorskie voivodeship (-110 ÷ -129 mm) and in the western Wielkopolska voivodeship (-70 ÷ -109 mm).

In areas where the value of CWB were the highest in the previous reporting period (Żywiecczyzna), increased by a further few mm. Heavy precipitation continued in areas in May and June – and are still listed as very high values of CWB (over 200 mm).

In the south of Poland, there are still no problems with a deficit of water for crops, but there are problems with a considerable excess of its requirement in southern parts of the voivodeship: Opolskie, Slaskie, Malopolskie, and Podkarpackie.