In June I wrote a column titled Will We Use The “D” Word This Summer? and it seems the answer is yes. The National Weather Service Forecast Office in Portland issued a Drought Information Statement on August 15th that gives a summary of the drought situation in Oregon. ” Severe to extreme drought persists across south-central and southeast Oregon (shown in red). Moderate drought continues for much of southwestern, north-central and northeast Oregon. The next Drought Information statement should be issued by the middle of September.
The main driver for drought conditions is the much-below-normal snowpack for the 2013/2014 Winter and spring. Peak snowpack in March for areas of the south Oregon Cascades and southeast mountains was only 15 to 60 percent of average.” “Drought conditions are expected to persist or intensify at least through October, especially for the southern half of the state.”
Drought declarations have been issued by the state of Oregon for Crook, Grant, Harney, Jackson, Josephine, Klamath, Lake, Malheur, and Wheeler counties. Drought declarations by the US Department of Agriculture have been issued for Baker, Coos, Crook, Curry, Deschutes, Douglas, Grant, Harney, Jackson, Josephine, Klamath, Lake and Malheur counties. Those are considered as Primary Designations. Designations for contiguous (sharing a common border, touching) counties include Benton, Jefferson, Lincoln, Linn, Morrow, Umatilla, Union, Wallowa and Wheeler counties.
In the previous column I mentioned earlier I compared the current rainfall totals for the calendar year and rain year. Now I have some updated numbers that the National Weather Service Forecast Office Portland compiled to show the percentage of rainfall that cities received compared to what is the historic average amount of rainfall.
LOCATION WATER YEAR PRECIP OCT-JUL (INCHES) PERCENT OF AVERAGE
Astoria 53.77 84
North Bend 34.00* 53
Portland 29.96 88
Eugene 27.00 61
Medford 15.20* 85
Redmond 04.75 59
Klamath Falls 07.33* 50
Pendleton 09.50 81
Ontario 06.52 69
Burns 06.75 67
* Water Year SEP-JUL – Starts one month earlier than the rest.
The National Weather Service Forecast Office in Portland reports that temperatures in Oregon were very hot in July except for coastal locations. Most of the reporting stations had monthly mean temperatures that were 4 to 6 degrees above normal. The coastal stations were only 1 to 2 degrees warmer than normal. Eugene broke its record for the number of days at 90 degrees or higher with a total of 16.
According to the Weather Service “Throughout the Spring and Summer months temperature is a factor in snowmelt, river conditions, irrigation demand and crop development.” The temperatures in April and May were near to above-normal throughout Oregon. June temperatures varied depending on location. The central Cascades and southeast Oregon were below-normal, southwest and north-central Oregon temperatures were above-normal. The remainder of the state had near-normal temperatures for the month of June.
What’s next? The official outlook for August through October showed that above-normal temperatures will continue. The updated 90-day outlook for September, October and November also shows above-normal temperatures. (The darker brown means Below normal while the tan is below, but not as severely above normal for temperature.) So far August temperatures are already 2 to 4 degrees above normal as of August 15th. The warmer temperatures and lack of precipitation can cause serious water shortages.
As of early August several reservoirs in south-central and southeast Oregon reported little or no remaining storage of water. Two reservoirs, Owyhee and Warm Springs, report 0% storage. Other reservoirs reporting 10% or less storage are Gerber, Fourmile Lake, Beulah, and Bully Creek. When the storage levels are that low it means that there is little or no water for irrigation downstream. The 90-day outlook shows we are in an area of below normal precipitation. (The darker brown means Below normal while the tan is below, but not as severely below normal for precipitation.) This also means there is a good chance our wildfire season will last longer because of the warmer and drier conditions staying with us for the next three months.
When we take all of this data into account it looks like many areas of the state will have worsening water storage conditions until the rain season gets underway. If the rain season is delayed we should expect the state’s water supply problems to increase. At least our water supply locally is reasonably secure because area residents get their water either from the McKenzie River or an underground aquifer and not only from a rain-dependent reservoir.
Let me know what you would like me to talk about or explain. You can comment below or email me at: [email protected].