Pacific ENSO Update

4th Quarter, 2007 Vol. 13 No. 4

FSM Flag Federated States of Micronesia

Kosrae State: Rainfall was below normal during the 3rd Quarter of 2007 at all recording locations around Kosrae. The 3-month totals ranged from 37.70 inches at the Nautilus Hotel to 44.21 inches at Tofol. Normal rainfall at Kosrae for the 3-month period of July through September is approximately 51 inches.

Kosrae Rainfall Summary 3rd Quarter 2007

Station  
July
Aug.
Sept.
3rd Qtr
Predicted (3rd Qtr)
Kosrae Airport (SAWRS) Rainfall (Inches)
13.88
10.61
15.01
39.50
50.70
% of Normal
82%
64%
87%
78%
100%
Utwa* Rainfall (Inches)
15.10
10.00*
13.23
38.33
50.70
% of WSO
N/A
N/A
N/A
76%
100%
Nautilus* Rainfall (Inches)
18.14
10.26
15.81
44.21
50.70
% of WSO
N/A
N/A
N/A
87%
100%
Predicted rainfall refers to forecast made in 2nd Quarter 2007 PEAC Newsletter.
* Long term normal is not established for these sites

Climate Outlook: Because of weather patterns associated with La Niña, the risk of a damaging tropical storm or typhoon is very unlikely at Kosrae during the remainder of 2007 through the summer of 2008. The very early stages of some developing tropical cyclones may bring some episodes of heavy rain to Kosrae in the next three months, but these systems should not become tropical storms or typhoons until they are well west of Kosrae.

Based on the continuation of La Niña conditions for the next few months, rainfall at Kosrae should be near normal for the next 3 months, and then have a good chance of becoming wetter than normal in the spring (late March through early June) when the trade-wind trough becomes established in the region.

Forecast rainfall for Kosrae State from November 2007 through October 2008 is as follows:


Inclusive Period
% of Long-Term Average Rainfall /
Forecast Rainfall (inches)

Nov 2007 - Jan 2008
(Heart of Next Dry Season)

100 %
(44.79 inches)

Feb - March 2008
(Onset of Next Rainy Season)

100%

April - June 2008
(Heart of Next Rainy Season)

120%

July - October 2008
(Onset of Next Dry Season)

100%
Forecast rainfall quantities represent BEST ESTIMATES given the probabalistic forecast for each particular season and station.

source: UOG-WERI