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Weather

Agana Heights, Guam

Current conditions

Temp: 80°	Dew Point: 73°
Humidity: 79%	Wind: East 4 mph
Visibility: 10.0 miles	Pressure: 29.88 in. -
Sky: Clear	Heat Index: 84°

Next 12 Hours

12 am	3 am	6 am	9 am	12 pm
Clear	Clear	Partly Cloudy	Partly Cloudy	Partly Cloudy
79°	79°	79°	86°	88°
Forecast data from the National Digital Forecast Database

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5-Day Forecast

Sunday

	Hi 88°
	Lo 79°

Clear

Monday

	Hi 88°
	Lo 79°

Rain Showers

Tuesday

	Hi 88°
	Lo 79°

Rain Showers

Wednesday

	Hi 88°
	Lo 79°

Rain Showers

Thursday

	Hi 88°
	Lo 79°

Rain Showers

Local Radar

Local Satellite

Almanac

Average High: 85°

Average Low: 75°

Record high/year: 89° (2001)

Record low/year: 75° (2000)

Sunrise: 5:54 AM

Sunset: 6:40 PM

Detailed History

Forecast for Guam

Updated: 1:38 am EDT on May 17, 2008

	Tonight Partly cloudy. Southeast winds around 10 mph in the evening becoming light. Lows around 79.
	Sunday Mostly sunny. Southeast winds 10 to 15 mph. Highs around 89.
	Sunday Night through Monday Night Partly cloudy with isolated showers. East winds around 10 mph. Lows around 79. Highs around 89.
	Tuesday through Wednesday Mostly cloudy with scattered showers. Highs in the upper 80s. Lows around 80.
	Wednesday Night Mostly cloudy with isolated showers. Lows in the upper 70s.
	Thursday through Saturday Partly cloudy with isolated showers. Highs in the upper 80s. Lows in the upper 70s.

Sun and Moon

Sunrise:	05:54 AM (ChST)	Moon Rise:	05:10 PM (ChST)	5 18
Sunset:	06:40 PM (ChST)	Moon Set:	04:11 AM (ChST)	5 18


Moon Phase

Today	May. 19	May. 27	Jun. 03	Jun. 10

NWS Forecaster Discussion

420 fxpq60 pgum 170756 afdpq Area forecast discussion National Weather Service tiyan GU 556 PM chst Sat may 17 2008 Synopsis... the environment around the Mariana islands continues to be complex and unsettled. An upper low in the tropical upper tropospheric trough (tutt) is producing strong subsidence and drying across the marianas. && Discussion... the remnants of tropical storm matmo have moved east of Mariana islands longitudes and that would normally allow a ridge to build to build in from the west and the TUTT to progress westward. However the monsoon trough to the west and the northeast movement of Typhoon Halong just west of the Philippines will likely prevent that. Thus...the TUTT cell over the marianas may pinch off and fill...allowing tropical moisture to move into the region. The gfs40 and the European model (ecmwf) suggest this scenario bringing in scattered showers Monday night through Wednesday. I delayed the arrival until Tuesday to shorten the duration. The GFS seems to be backing off of the long duration showers and UKMET does not bring in significant tropical moisture and keeps the region relatively dry. This is a tough one. The GFS indicates that the TUTT low to the east near 17n160e will propagate to the west...nearing the marianas by Tuesday but considerably weaker. && Short term... the marianas should remain relatively dry into Monday and likely into Monday night..but cirrus will increase. Long term... after 48 hours...there is a chance of scattered showers...but more likely mostly cloudy with isolated showers. We probably should look at the trend of the GFS and other models through the next forecast period before making drastic changes to the existing forecast. && Marine... the current north swell is abating...but another is expected to arrive on Tuesday. It shouldn't be any higher than 4 feet. However...rip current risk could rise to moderate on north facing reefs. && Fire weather... the kdbi is 713. That is extreme. && Tropical systems... Halong has an eye now and will likely strike western Luzon in the next 12 hours. && Eastern micronesia... monsoon trough has pushed eastward to between Pohnpei and Kosrae. Trade-wind convergence zone has set up from just east of Majuro westward to where it meets the monsoon trough east of Pohnpei. Upper-level low is currently centered near 17n159e. Upper-level divergence south of the low is acting to enhance convection over all forecast locations. No major changes to the forecast. Believe winds will be light and variable on Pohnpei and Kosrae at first due to the proximity of the monsoon trough. GFS appears to be the only model initializing the monsoon trough this far east. Kosrae lies close to the intersection of the monsoon trough and trade-wind convergence zone...with upper-level divergence overhead. Kosrae Handar is showing heavy rainfall is already in progress on Kosrae...with 3.51 inches accumulating during the past 7 hourly observation. Accordingly...have added locally heavy wording to the first period. Change to Majuro amounts to a Nowcast...with trade-wind convection already overhead. Swell capable of producing high surf is not anticipated through the forecast period. && Western micronesia... have toned down the near-term forecast for Chuuk with weak circulation west of Chuuk drifting westward and some ridging pushing in from the south. Forecast scenario of convection pushing in from the east beginning on Tuesday still looks good. Tweaked Yap near-term forecast for weak winds due to proximity of monsoon trough. Looks reasonable for convection due on Chuuk Tuesday to arrive on Yap Wednesday. Made short-term changes to Koror forecast to account for weakening monsoon trough just to the east and associated convection tonight. Otherwise...forecast for Koror is similar to that for Yap. Swell capable of producing high surf is not anticipated through the forecast period. && Gum watches/warnings/advisories... GU...none. Marianas waters...none. && $$ Guard/McElroy

National Weather Service Glossary of Abbreviations

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Local Storm Report

05/15/2008 0900 am

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