Table 2.

The Rank Percentiles for the 2017–2021 Period, Relative to the 1980–2021 Period Using the Palmer Drought Severity Index (PDSI) (Abatzoglou, 2013), and Relative to the 1984–2021 Period Using the Global Surface Water (GSW) Monthly Data Set (Pekel et al., 2016)

Region	Site	PDSI (min, %)	PDSI (max, %)	PDSI (median, %)	GSW monthly count	Water (min, %)	Water (max, %)	Water (median, %)
North Central	ND1	4.2	98	40.1	26	20	95.2	43.1
	ND4	1.2	95.9	49.4	24	27.4	91.3	65.8
	ND2	0.9	100	59.8	29	2.6	100	48.9
	ND3	0.8	99.7	37.1	26	27.5	94.9	67.9
	MN1	1	100	57.9	28	0.5	100	45.4
	MN2	9.3	100	73.8	19	1.2	99.3	32
	MN3	2.5	100	72.9	25	0.6	99.3	33.9
	MN4	4	100	89.2	25	0.5	98.9	43.4
Midwest Central	SD2	7.9	100	61.7	26	12	98.3	65.3
	SD1	6.7	100	62.2	27	27.4	98.4	74.6
	SD3	17.7	100	72.3	21	6	100	72
	SD4	7.1	100	67.3	29	25	100	70.9
	IA2	15.8	100	91.5	29	0.5	100	65.7
	IA1	21.1	99.5	77.7	34	27.7	98.5	69.1
	IA3	16.7	98.8	78.1	31	15.3	99	51.4
	IA4	25.8	100	83.4	30	2.3	100	66.5
Southwest Central	MO1	14.7	99.1	64.2	32	11.1	100	74.7
	OK2	21.1	100	70.1	31	4.2	99.1	75.1
	OK1	18.2	100	70.1	32	13.1	100	76.9
	OK4	14.4	100	87.1	32	17.7	98.7	67
	OK3	11.6	96.3	57.4	35	24.1	99.5	72.9
	TX1	19	98.3	72.8	31	25.6	100	80.9
	TX2	13.2	96.7	61.1	38	28.6	100	72.9
	TX4	21.2	94.9	56.7	29	4	50	28.6
Southeast Central	MO2	9.8	92.7	64.4	37	9.1	100	76.3
	MO4	22	98.8	69.4	32	10.4	98	66.6
	MO3	25.1	100	70.5	29	20.3	100	68
	AR1	19.6	100	89.8	35	13.3	100	70.8
	AR2	28.4	99.1	90.1	32	9.8	100	65.1
	MS1	27.5	100	85.2	31	13.9	100	68.6
	LA1	22.1	100	81.3	38	3	99.1	50.8
	TX3	24.8	100	79.3	34	21	92.2	60.3
	All	14.2	99	70.1	30	13.3	97.2	62.2