Tag Archives: Climate Prediction Center

Rains in North Kitsap falling at record levels, but a shift is coming

Rainfall in much of North Kitsap has been falling at record rates since the beginning of the so-called water year, which begins in October. If you live in Kingston, January’s rainfall is running well above records kept since 1993 by the Kitsap Public Utility District.

Kingston

For the month of January, 9.4 inches has fallen in Kingston so far. That is more rainfall this January than during any January in the 23-year record. The previous high in Kingston for the month of January was 8.3 inches in 2006.

As you can see from the chart, this year’s rainfall in Kingston (blue line) was tracking slightly above the record until early December, when it took off at a higher rate. January burst forth at an even higher rate.

Hansville

The pattern was similar for Hansville to the north, where rains have been falling hard. Extremely high rainfall in November of 2010 established a record for that year that will be difficult to beat in our northernmost community.

So far this year, Poulsbo (KPUD office) has been tracking the maximum water year fairly closely since October. January 2016 is the wettest recorded at this site. So far in January, it has recorded 11.6 inches. The previous high, 11.2 inches, was recorded in 1998. Thanks to Mark Morgan at the PUD for this analysis.

Poulsbo

Central Kitsap near Bremerton caught up with the maximum water year this past week. And Holly lags behind the maximum water year of 1999 but well above the 26-year average.

If you haven’t noticed, the Kitsap Peninsula is a rather strange place for measuring the rain. Historically the northern tip gets about half the annual rainfall as the southwest part.

Central Kitsap

For the Pacific region as a whole. the well-publicized El Niño effect has grown stronger, becoming one of the strongest El Niño years since at least the 1950s. But that is about to change. Based on sea surface temperatures, we have just passed the peak of the El Niño, and most models suggest that ocean conditions will transition to a neutral pattern by summer. See El Niño forecast graph and the narrative by the Climate Prediction Center (PDF 707 kb).

Holly

According to the CPC report, “El Niño has already produced significant global impacts and is expected to affect temperature and precipitation patterns across the United States during the upcoming months.”

According to predictions, temperatures should remain above average for at least the next three months. Meanwhile, precipitation is expected to continue above average for the next week or so, decline to average in about a month, then remain below average until at least the first part of May. For a quick look at this graphically, check out the interactive display.

Meanwhile, as the Northwest and Great Lakes regions experience drier than average conditions over the next few months, California and the Southwest states, along with Florida and the Gulf states, will see above-average rainfall.

As observed by the Climate Prediction Center:

“Since we are now past the peak of the El Niño event in terms of SST anomalies, the relevant questions relate to how quickly the event decays and whether we see a transition to La Niña, which frequently follows on the heels of El Niño event, the CPC SST consolidation forecasts a return to neutral conditions by May-June-July and a 79 percent chance of La Niña by next winter.”

The following video describes the current El Niño conditions.

Kitsap precipitation nearly normal during
the past water year

Despite concerns about drought in much of Washington state, Kitsap County came through the water year (ending Sept. 30) with precipitation just about normal.

Precipitation at Hansville over the past water year.
Precipitation at Hansville over the past water year. (Click to enlarge) // Graphic: Kitsap PUD

As you can see from the graphs on this page, precipitation in 2015 (blue line) fairly well tracked the average (pink line). The previous water year (orange line) was more concerning, although both 2014 and 2015 water years ended in fairly decent shape.

Areas in North Kitsap ended the year somewhat above average. In Hansville, the annual total was 34.3 inches, compared to an average of 30.2 inches. In Central and South Kitsap, many areas were slightly below normal. In Holly, the annual rainfall was 69.4 inches, compared to an average of 76.6 inches.

Hansville precipitation over the past water year.
Precipitation at Bremerton National Airport over the past water year. (Click to enlarge) // Graphic: Kitsap PUD

The Kitsap Peninsula largely relies on groundwater for its water supplies, and we have gotten enough rains to keep the aquifers in fairly decent shape, according to Mark Morgan of Kitsap Public Utility District.

“Aquifers experienced their typical summer drawdown, driven more by demand than by drought, but (it was) nothing exceptional,” Mark said in a summary of the water year.

Concerns about drought in other parts of the state were largely based on a lack of snowpack coming out of last winter.

Precipitation at Bremerton National Airport over the past water year.
Precipitation at Holly over the past water year. (Click to enlarge) // Graphic: Kitsap PUD

Meanwhile, flows in many streams hit low-flow conditions a month earlier than normal this past summer, but some maintained their typical flow, Mark said. Adequate streamflows are critical for coho salmon, which spend a year in freshwater, as well as for year-round residents, such as trout.

The forecast for the winter is based on strong El Nino conditions (see map below), which means that sea surface temperatures off the coast of South America will be significantly higher than usual — up to 3.4 degrees F (2 degrees C). Above-normal temperatures are expected across the western U.S. as well as the northern tier states and Eastern Seaboard, with the greatest chance of above-normal temperatures in the Pacific Northwest.

Sea surface temperatures are above average across most of the Pacific Ocean. NOAA map
Sea surface temperatures today are above average across most of the Pacific Ocean. (Click to enlarge) // NOAA map

Below-average temperatures are expected in New Mexico and West Texas. For details, see the prediction maps at the bottom of this page or check out NOAA’s Climate Prediction Center.

While much of the country will benefit from greater rainfall, below normal precipitation is expected for the Northwest and areas in the Eastern Great Lakes, New York and northern New England.

Climatologists predict with 95 percent certainty that the El Nino will continue through the winter in the Northern Hemisphere before gradually weakening in the spring.

Temperatures are predicted to be warmer this winter across the northern states. NOAA graphic
Temperatures this fall are predicted to be above average across the northern states. // NOAA graphic
Precipitation is predicted to be less than normal in the Pacific Northwest. NOAA graphic
Precipitation is predicted to be less than normal in the Pacific Northwest. // NOAA graphic