Severe drought in the spring of 2020 in Poland. More of the same?

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Agronomy 2020, 10, x; doi: FOR PEER REVIEW www.mdpi.com/journal/agronomy Institute for Agricultural and Forest Environment, Polish Academy of Sciences, Bukowska 19, Poznań

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809, Poland; [email protected]

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* Correspondence: [email protected]

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Supplementary Material

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Figure S1. Values of SPEI 12 for 13 analyzed stations from January 1971 to May 2020 (left column) and for

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grid with stations from January 1950 to May 2020 based on SPEI Global Drought Monitor (right column).

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Agronomy 2020, 10, x FOR PEER REVIEW 6 of 13

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Agronomy 2020, 10, x FOR PEER REVIEW 8 of 13

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Toruń Białystok Gorzów Wielkopolski Poznań Warszawa Siedlce Terespol 17 18 21 23 23 15 14 13 24 21 8 8 13 25 23 15 22 8 23 19 17 13 23 18 24 23 21 13 7 5 26 17 24 11 15 13 21 21 8 12 8 13 24 13 9 -20.96 -24.99 -30.15 -36.26 -33.97 -25.41 -16.80 -13.08 -31.93 -31.91 -17.01 -8.83 -13.49 -34.04 -29.86 -16.04 -29.69 -9.62 -30.49 -24.56 -25.67 -14.70 -25.95 -26.96 -38.57 -42.30 -30.75 -15.29 -7.47 -6.04 -25.32 -24.56 -39.60 -10.66 -21.78 -12.88 -29.71 -30.24 -9.45 -15.32 -15.05 -18.41 -34.38 -19.79 -7.53 May-90 Oct-04 Apr-17 May-20 Jun-84 Aug-90 Jul-93 Aug-06 Jul-16 May-20 Jul-72 Jun-84 Jun-90 Aug-01 May-04 Sep-06 Jun-16 Apr-19 May-84 Aug-90 Aug-93 May-04 Mar-17 Jan-20 Jun-84 May-20 Jun-77 Jun-84 Dec-92 Aug-00 May-07 Sep-16 May-20 Jun-74 Jun-84 Aug-00 Apr-04 Aug-06 Apr-19 May-20 Jul-72 Sep-92 Jul-04 Jul-06 Oct-12 -1.75 -2.13 -1.96 -2.30 -1.94 -2.46 -1.59 -1.73 -1.78 -1.98 -2.30 -1.64 -1.74 -2.18 -1.91 -1.93 -2.19 -1.68 -1.91 -1.86 -2.18 -1.64 -1.64 -2.13 -2.04 -2.23 -2.08 -1.71 -1.58 -1.90 -1.96 -2.02 -2.10 -1.50 -2.10 -2.10 -1.81 -2.59 -1.59 -1.66 -2.20 -1.80 -1.84 -1.83 -1.61 Jun-89 Nov-03 May-16 Apr-19 Jan-83 Sep-89 May-93 Jul-06 Sep-15 Nov-18 Feb-72 Apr-84 Sep-89 May-00 Mar-03 Jul-06 Aug-15 Nov-18 Feb-83 Sep-89 May-93 Nov-03 Aug-15 Apr-19 Jun-83 Jun-19 Jul-76 Apr-84 Aug-92 Jun-00 Jul-06 Aug-15 May-20 Sep-73 Apr-84 Jun-00 Mar-03 Jul-06 Nov-18 Jan-20 May-72 Aug-92 Nov-03 May-06 Jul-12

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Agronomy 2020, 10, x FOR PEER REVIEW 10 of 13 Zielona Góra Wrocław Kalisz Łódź Lublin Włodawa 14 24 22 15 47 15 23 23 16 10 16 26 23 14 40 12 19 15 23 23 14 31 26 21 8 11 15 9 6 18 9 23 9 12 16 25 12 8 13 21 -19.05 -34.55 -24.13 -21.99 -49.74 -18.66 -38.24 -26.49 -21.08 -11.56 -24.05 -43.04 -30.44 -18.18 -40.31 -15.04 -23.66 -25.16 -35.10 -33.63 -18.04 -35.31 -31.68 -31.78 -14.69 -13.97 -21.89 -9.25 -5.57 -20.23 -9.76 -36.18 -9.94 -13.01 -16.78 -39.73 -12.73 -10.44 -18.73 -29.52 Jun-16 May-20 May-84 Jun-93 May-07 Jul-16 May-20 Jun-91 Sep-93 Jun-95 Aug-16 May-20 Apr-91 Jul-93 Oct-06 Jun-09 Mar-13 Jul-16 May-20 Aug-84 Jul-93 Jun-07 Jul-16 May-20 Jul-72 Apr-77 Aug-83 Aug-84 Oct-06 Feb-13 Mar-16 May-20 Apr-83 May-84 Mar-97 Aug-04 Aug-06 Feb-13 Jun-16 May-20 -2.27 -1.85 -1.57 -1.96 -2.00 -1.76 -2.18 -1.87 -1.74 -1.66 -2.15 -2.24 -1.88 -1.67 -1.62 -1.66 -1.66 -2.18 -1.77 -2.10 -1.73 -1.75 -2.05 -2.16 -2.25 -1.73 -2.24 -1.72 -1.65 -1.99 -1.72 -2.32 -1.57 -1.97 -2.11 -2.30 -2.14 -1.94 -2.12 -1.93 Aug-15 Dec-19 Jan-83 May-93 Jul-06 Sep-15 Apr-19 Jul-90 Apr-93 Apr-95 Sep-15 Jul-19 Jun-90 May-93 Jul-06 Apr-09 Jul-12 Sep-15 Jun-19 Mar-84 Aug-92 Jul-06 Sep-15 Mar-20 Jun-72 Jan-77 Nov-82 Apr-84 Jul-06 Sep-12 Aug-15 Apr-19 Nov-82 Apr-84 Jun-96 Nov-03 Jul-06 Jul-12 Aug-15 Jan-20

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Table S2. The drought periods for which the value of SPEI 24 stayed below -0.5 and lasted at least five

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months with minimum value below -1.5 (definition of severe drought), based on results of SPEI 24. The most

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severe values are marked in bold.

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Station Duration (month) Cumulative deficit below -0.5 Last month of drought period Minimum value during event Data of minimum occurence Szczecin 13 13 23 45 -15.05 -16.86 -27.28 -53.47 Dec-73 Jul-84 Apr-91 May-07 -1.82 -1.54 -1.64 -1.85 Jun-73 Mar-84 Jul-90 Oct-04

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Białystok Gorzów Wielkopolski Poznań Warszawa Siedlce Terespol Zielona Góra Wrocław Kalisz Łódź Lublin 12 14 51 14 16 24 59 29 12 35 23 22 14 24 25 15 25 16 64 12 15 52 26 16 13 51 54 27 20 38 27 25 30 41 24 26 20 25 39 23 12 33 20 12 23 -21.20 -17.62 -78.11 -13.96 -25.05 -28.54 -77.46 -36.51 -19.78 -49.50 -38.67 -29.35 -19.05 -28.43 -33.98 -28.41 -32.00 -14.50 -88.31 -16.66 -16.58 -70.87 -30.63 -27.05 -17.54 -61.72 -62.33 -28.86 -28.95 -37.88 -32.80 -41.18 -37.25 -45.14 -24.52 -35.50 -27.72 -37.79 -44.92 -30.65 -19.34 -41.88 -21.06 -13.67 -37.95 May-20 Aug-84 Jul-04 Dec-06 Sep-16 Sep-84 May-94 May-17 May-20 Jul-85 May-20 Mar-78 Aug-84 Aug-07 Jun-17 May-20 May-85 Aug-01 Oct-07 May-20 Aug-93 Sep-07 Mar-17 May-20 Jul-84 Sep-93 Feb-08 Jun-17 May-20 May-95 Jul-17 May-20 Feb-92 Sep-07 Mar-14 Jun-17 May-20 Jul-85 Sep-07 Mar-17 May-20 May-85 Aug-07 Apr-13 May-20 -2.14 -1.64 -2.27 -1.93 -2.19 -1.81 -2.27 -1.69 -1.92 -2.11 -2.29 -1.99 -1.70 -1.94 -2.01 -2.49 -1.84 -1.50 -2.38 -1.78 -1.66 -2.19 -1.90 -2.27 -1.50 -1.94 -1.85 -1.51 -2.12 -1.69 -1.59 -2.34 -1.78 -1.56 -1.56 -1.73 -2.05 -2.03 -1.87 -1.77 -1.99 -2.09 -2.02 -1.96 -2.39 Apr-20 May-84 May-01 Jul-06 Sep-15 Mar-84 Jun-93 Sep-16 May-20 Mar-84 Dec-19 Jan-77 Apr-84 Jul-06 Sep-16 Feb-20 Apr-84 Jun-00 Jul-06 Apr-20 Aug-92 Sep-03 Jun-16 Apr-20 Mar-84 Jun-93 Jul-06 Sep-16 Jan-20 Jun-93 May-16 Apr-20 Aug-90 Jul-06 Dec-12 Jun-16 Apr-20 Jun-84 Jul-06 Sep-15 Apr-20 Feb-84 Jul-06 Sep-12 Apr-20

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Agronomy 2020, 10, x FOR PEER REVIEW 12 of 13 Włodawa 15 15 6 9 48 16 -19.07 -14.57 -6.12 -9.89 -71.01 -23.89 Aug-84 Apr-91 Jun-96 Jun-97 Jun-07 May-20 -1.77 -1.76 -1.52 -1.52 -2.73 -2.03 Dec-83 Aug-90 May-96 Mar-97 Sep-03 Dec-19

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Table S3. The drought periods for which the value of SPEI 30 stayed below -0.5 and lasted at least five

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months with minimum value below -1.5 (definition of severe drought), based on results of SPEI 30. The most

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severe values are marked in bold.

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Station Duration (month) Cumulative deficit below -0.5 Last month of drought period Minimum value during event Data of minimum occurence Szczecin Toruń Białystok Gorzów Wielkopolski Poznań Warszawa Siedlce Terespol Zielona Góra Wrocław 16 23 39 27 11 26 27 15 27 23 10 22 58 21 36 60 27 7 36 49 22 25 21 36 26 26 12 25 63 11 59 22 14 49 49 14 66 34 -16.76 -26.71 -53.21 -37.94 -14.75 -39.34 -37.56 -16.66 -27.04 -33.03 -12.87 -24.45 -90.82 -25.41 -39.19 -85.30 -36.84 -9.37 -53.38 -51.98 -35.13 -30.08 -23.90 -37.81 -30.62 -34.56 -22.87 -31.63 -93.40 -11.86 -82.46 -28.04 -22.26 -64.77 -64.37 -20.60 -76.69 -37.47 Sep-74 Oct-91 May-07 Sep-17 May-20 Jul-85 Feb-92 Aug-93 Jun-07 Mar-17 May-20 Mar-85 Feb-05 Feb-17 Dec-85 Nov-94 Jun-17 May-20 Dec-85 Mar-08 May-20 Jun-78 May-85 Nov-92 Feb-08 Sep-17 May-20 Apr-85 Mar-08 May-20 Mar-08 Mar-17 May-20 Jan-94 Mar-08 May-20 May-95 Oct-06 -1.64 -1.55 -1.90 -1.92 -2.13 -2.06 -1.82 -1.55 -1.73 -2.26 -2.13 -1.54 -2.19 -1.90 -1.77 -2.11 -1.66 -1.86 -2.17 -1.51 -2.26 -2.12 -1.73 -1.54 -1.76 -2.03 -2.61 -1.71 -2.13 -1.86 -2.13 -1.68 -2.20 -1.74 -1.87 -2.06 -1.52 -1.52 Jun-73 Jan-91 Jun-05 Nov-16 May-20 Feb-84 Feb-91 Jun-93 Jul-06 Jun-16 Apr-20 Apr-84 Feb-01 Mar-16 Apr-84 Jun-93 Nov-16 May-20 Jun-84 Jul-05 May-20 Jun-77 Apr-84 Aug-92 Jul-06 Sep-16 Apr-20 Apr-84 Jul-06 Apr-20 Mar-04 Dec-15 Apr-20 Jun-93 Jul-06 May-20 Sep-94 Nov-05

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Lublin Włodawa 47 41 23 10 32 22 23 49 14 -47.83 -50.39 -29.04 -12.47 -43.32 -35.25 -25.50 -76.83 -20.47 Mar-94 Mar-08 Apr-17 May-20 Nov-85 May-20 Feb-85 Jun-07 May-20 -1.51 -1.84 -1.86 -2.13 -2.09 -2.51 -1.61 -2.67 -2.14 Aug-92 Oct-06 Dec-15 Apr-20 Jun-84 Apr-20 May-84 Mar-04 Apr-20 © 2020 by the authors. Submitted for possible open access publication under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).