Back-to-Back Pacific Storms to Impact the West Coast; Heavy Snow in the Central Appalachians

Back-to-back powerful Pacific storm systems to impact the Pacific Northwest and northern California through the end of this week with heavy rain, flooding, strong winds, and higher elevation mountain snow. A strong, long-duration atmospheric river will accompany the Pacific storms, bringing excessive rainfall and flash flooding to southwest Oregon and northwest California through the week. Read More >

June 2018 was above average temperature-wise, from 2 to 6+ degrees. Portions of the James River Valley were warmest, as below average precipitation allowed for drier and thus warmer air here. The first half of the month was record-breaking in some cases, including 99° on the 14^th and 97° on the 5^th at Mobridge, 99° on the 5^th in Pierre, 95° on the 5^th in Watertown (daily records).

Much of central South Dakota and west central Minnesota received above average precipitation while portions of the Coteau and the James Valley were below average. Accordingly, and on the heels of a dry May as well, the James River Valley is where, on June 1^st, high winds associated with thunderstorm activity produced a dust storm which greatly reduced visibility during the evening hours. (https://www.weather.gov/abr/2018June1_Severe_Dust). Drought, severe in some cases, persisted through the month across portions of the James River Valley despite an overall active weather pattern. Bad luck can be attributed to this relatively small region of drought. On the contrary, bouts of heavy rain occurred across the area as well. Watertown for instance picked up a daily record 1.84” of rain on the 11^th, 1.55” of which fell in one hour from 10 to 11 am. Localized flooding resulted in town. Daily rainfall records were also set at Pierre (1.84” on the 27^th) and Mobridge (1.09” on the 17^th).

As is typical in June, impactful severe weather developed on a number of days. A line of storms during the evening of June 5^th into the morning of June 6^th produced widespread straight-line wind damage from Corson/Dewey counties to Grant county. A wind gust of 100 mph was recorded near Lowry (https://www.weather.gov/abr/20180605WindAndHail). On June 16^th, two tornadoes developed near Burdette, and another touched down briefly near Claire City on the 24^th (several funnel clouds this day as well). Finally, two separate large hailstorms affected generally the same area of Dewey, Sully, Hughes and Stanley counties on the early morning of 27^th and on the evening of the 29^th. Hail scars were visible via satellite in the following days as large swaths of cropland and other vegetation were pulverized.

*JUNE 2018*
Temperature Data	Aberdeen	Sisseton	Wheaton	Watertown
Warmest Temperature / Date	101 / 5^th	92 / 5^th	89 / 29,30^th	94 / 5^th
Coldest Temperature / Date	44 / 13^th	52 / 13^th	55 / 13^th	48 / 13^th
Average High / Departure from Normal	84.7 / +7.3	82.1 / +4.8	80.4 / +3.1	79.9 / +3.2
Average Low / Departure from Normal	59.5 / +5.8	60.5 / +5.7	62.4 / +6.3	60.3 / +5.8
Monthly Average / Departure from Normal	72.1 / +6.5	71.3 / +5.2	71.4 / +4.7	70.1 / +4.5
Precipitation Data
Monthly Precipitation / Departure from Normal	2.72 / -0.98	2.98 / -0.76	4.55 / +0.57	3.45 / -0.13
Most Precipitation in 24 hours / Date	1.19 / 16^th	1.21 / 24^th	0.97 / 12^th	1.84 / 11^th

Temperature Data	Pierre	Kennebec	Mobridge	*Timber Lake
Warmest Temperature / Date	99 / 5^th	97 / 5^th	99 / 14^th	96 / 5^th
Coldest Temperature / Date	45 / 13^th	46 / 13^th	48 / 13^th	47 / 3^rd, 13^th
Average High / Departure from Normal	82.6 / +2.6	84.3 / +2.4	82.7 / +4.9	80.4 / +1.9
Average Low / Departure from Normal	58.9 / +3.5	59.3 / +3.5	60.1 / +6.3	56.5 / +2.9
Monthly Average / Departure from Normal	70.7 / +3.0	71.8 / +3.0	65.8 / +5.6	68.5 / +2.4
Precipitation Data
Monthly Precipitation / Departure from Normal	4.45 / +0.88	4.45 / +1.1	3.63 / +0.47	3.61 / +0.31
Most Precipitation in 24 hours / Date	1.84 / 27^th	1.12 / 9^th	1.09 / 17^th	1.16 / 17^th