Heads up, Guam & CNMI: TY 31W is leaving, but Invest 90W is trying to spin up. Likely stationary thru Tue, then WNW–NNW with a Wed–Thu window between Yap & Guam. Expect rain/wind to tick up starting Wed.
So what the heck is a Hydrologic Outlook?
Hydrologic Outlook = early heads-up about possible flooding.
It’s issued by the National Weather Service when heavy rain is likely to cause flash flooding, urban/poor-drainage flooding, or small stream rises, but confidence/timing isn’t firm enough yet for a Watch.
It is not a Watch or Warning.
No immediate danger signal, just “pay attention, conditions are lining up.”
What it means for the Marianas right now:
Midweek (Wed–Thu) bands from the nearby disturbance could dump repeating downpours, leading to flash-flood potential in prone spots (low crossings, poor drainage, construction zones).
What to do when you see one:
Keep an eye on updates. An Outlook can be upgraded to a Flood Watch (conditions favorable) and, if flooding starts, a Flood/Flash Flood Warning (take action now).
Clear drains/gutters; stage sandbags if you flood easily.
Check your midweek plans (school pickup, shift work, outdoor jobs) and add buffer time.
