Local Flood Information Update & Amazing Rain Totals

Dateline: Albany, OR    1:07 pm PST  by: Jim Willhight

This mornings headline from the National Weather Service 9:30 am Portland, OR front page was:

Active Weather Pattern Continues Across the Pacific Northwest,

By Saturday evening, another frontal system will be approaching the region and will bring yet another round of precipitation to the region, including gusty winds. Rain Totals, Local Flood Information

This next round of storms will bring another cyclical crest of flood waters locally by the  middle to end of next week.  

Flood Warning:  

Santiam, Marys and Luckiamute Rivers

The Flood Warning continues for The Santiam River At Jefferson.

  • At 8 AM Friday the stage was...14.8 feet / 54200 cfs.
  • Flood stage is 15.0 feet and flood flow is 56300 cfs.
  • Minor flooding is forecast.
  • Forecast...This river is expected to rise above flood stage around  10 AM Friday and is expected to crest at 15.1 ft before noon Friday.
  • Impact...Above 15.0 ft, expect widespread lowland and agricultural  flooding. Some secondary roads in low lying areas will be flooded at this level.
Rv_Santiam_Jefferson_2015_1218.png

The latest forecast reports the North Santiam and South Santiam rivers will remain  below flood stage for the next five days.

Likewise the Marys River peaked slightly above major flood stage at 4 o'clock this morning at 21.1 feet.  Minor  flooding takes place at 20 feet, with the major flood level 20.7 feet.

How Much Rain with the last Storm?

Period:  The first rainfall from the latest storm started falling 7:51 pm Wednesday (12/16).  Rain fall continued until 4:07 am, Friday (12/18). 

Storm Total: Over this 32 hours 17 minutes 4.16 inches of rain fell (South Albany Reporting Station).

Month Total: Our December total to date is 12.89 inches with 13 more days left in the month.

Rainfall Rate: The average for the storm was 0.129 inches of rain per hour or at a rate of 3.1 inches per hour period.

The maximum rainfall rate occurred Wednesday night from 11:08 to  11:23 when 0.11 inches fell in a fifteen minute period.  That is a rate of 0.44 inches per hour.

If that downpour were continue at the same rate for a 24 hour period the day total would be over 10.5 inches!

The rain picked up later on Thursday morning (12/17) starting at 4:56 through about 10 o'clock where we totaled 2/3  of  an inch of new rainfall.

Check out the graph storm total at bottom of this post.

 

Graph illustrating the cumulative total rainfall for storm starting Wednesday (12/16/2015 evening) running through the  last rainfall at 4:07 on Friday (12/18/2015).

Graph illustrating the cumulative total rainfall for storm starting Wednesday (12/16/2015 evening) running through the  last rainfall at 4:07 on Friday (12/18/2015).