Map layer from NOAA National Weather Service. Boundaries from the Iowa Environmental Mesonet.
Alerts in force1
Every product covering any part of Guam, worst first, with its full text.
Severe 1
Flood Watch
Severe
Flood Watch issued September 21 at 3:35PM ChST until September 23 at 10:00PM ChST by NWS Tiyan GU
Begins Until 46 hr 38 min left
Areas Guam, GU
Full text
* WHAT...Flash flooding caused by excessive rainfall is possible.
* WHERE...Guam.
* WHEN...From Tuesday morning through Wednesday evening.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Flooding may occur in poor drainage and urban areas. Low-water
crossings may be flooded.
* ADDITIONAL DETAILS...
- Heavy rainfall from Invest 91W located south of Guam may lead to
flash flooding Tuesday through Wednesday evening. Guidance shows
2 to 5 inches of rain falling during the watch period as Invest
91W moves just west of Guam. Many locations across Guam have
already seen 2 to 4 inches of rain since Saturday and soils
remain wet from heavy rainfall the last couple of weeks. This
will allow for a lower threshold for flash flooding over the next
couple of days.
- http://www.weather.gov/safety/flood
What to do
You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.
The hazard is happening or about to. Act now: a tornado warning means take shelter, a flash flood warning means move to higher ground.
Watch
Conditions favor the hazard. Nothing is happening yet; have a plan and be ready to act if a warning follows.
Advisory
A hazard that is less serious than a warning but can still cause trouble, such as dense fog, heat or light ice.
Statement
Information about weather that does not yet meet a warning: a strong storm, a hydrologic update, or a special weather statement.
Severity (extreme, severe, moderate, minor) is the rating the issuing office gives each product. More on the difference: tornado watch vs. tornado warning. Alerts come from the National Weather Service; follow its instructions and your local officials.
Sources
Alerts from the National Weather Service's public feed, read afresh every minute, and matched to counties and zones by their UGC codes. Warnings from outside the United States come from each country's own meteorological service. Follow the issuing office's instructions and your local officials.
