Weather Center: Guam

Current alerts

1 typhoon warning, 1 coastal flood warning and 1 high surf warning touch Guam. 1 typhoon warning 1 coastal flood warning 1 high surf warning (touching Guam)

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NWS alerts checked 04:59Z · Data: NOAA/NWS

Sources & update times

SPC Day 1 outlook issued 00:50Z · Data: NOAA/SPC

SPC Day 2 outlook issued 16 Oct 17:24Z · Data: NOAA/SPC

SPC Day 3 outlook issued 16 Oct 19:22Z · Data: NOAA/SPC

SPC discussions checked 04:59Z · Data: NOAA/SPC

SPC storm reports checked 04:55Z · Data: NOAA/SPC

WPC Day 1 outlook issued 00:56Z · Data: NOAA/WPC

WPC Day 2 outlook issued 16 Oct 19:17Z · Data: NOAA/WPC

WPC Day 3 outlook issued 16 Oct 19:17Z · Data: NOAA/WPC

Each feed is judged on its own clock. The masthead’s reading is the site’s publishing health, which is a different thing: a publishing delay does not make a freshly read warning stale, and a fresh check does not make an old outlook newly issued.

NWS warnings / SPC selected outlook: feeds current

NWS warnings: Feed current; checked 04:59Z.

SPC selected outlook: Feed current; checked 04:55Z.

Checked means retrieved, not newly issued. Each graphic retains its issue, observation, initialization or valid time. Site publishing status is separate.

Hazard & forecast product

Day 3 carries one combined probability.

SPC Day 3 any severe probability, Sunday 18 Oct

Source: SPC

Now, not forecast: Current warnings as of 04:59Z are drawn over the outlook for Sunday 18 Oct, the warnings hatched so the forecast shows through. They are in force now; the outlook is for its own period. Show the forecast alone

Forecast: SPC’s scale

SPC Day 3 any severe probability: Less Than 5% All Areas

SPC Day 3 any severe probability, valid 18 Oct 12:00Z to 19 Oct 12:00Z, issued 16 Oct 19:22Z · Data: NOAA/SPC. Warnings and watches are as of 04:59Z (now), not for the outlook’s period.Guam is outside this map, which draws the conterminous states; its warnings are listed below.

Everything on the map, as a list

SPC Day 3 any severe probability: Less Than 5% All Areas

Briefing details · Where, When, Main hazards

Sunday briefing for Guam

Highest anywhere in Guam: no outlook here

This is the outlook, a forecast. Warnings in force here are listed above it and outrank it.

SPC and WPC issue outlooks for the lower 48 states only; Guam’s warnings are listed with the current alerts.

Where: Guam is outside the area SPC’s and WPC’s outlooks cover, the lower 48 states.
Prepare: Guam has no SPC or WPC outlook to prepare from; follow its warnings in Current alerts.

Official discussion

SPC’s discussion covers the whole country, not Guam alone.

SPC Day 3 Convective Outlook narrative, issued 16 Oct 19:23Z · Data: NOAA/SPC

000
ACUS03 KWNS 161923
SWODY3
SPC AC 161922

Day 3 Convective Outlook  
NWS Storm Prediction Center Norman OK
0222 PM CDT Fri Oct 16 2026

Valid 181200Z - 191200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms are not expected Sunday.

...Synopsis...
A front will stall in the vicinity of south FL and provide a focus
for thunderstorm development in a moist environment with PW values
in excess of 2 inches.  Across AZ/NM, a midlevel trough will eject
northeastward in advance of height falls over the Pacific Northwest
coast late in the period.  Midlevel lapse rates, moisture and ascent
could be sufficiently deep for charge separation and isolated
lightning flashes with weak midlevel convection.

..Thompson.. 10/16/2026

$$

SPC’s outlook page

Forecast details

SPC’s categorical outlook rates the coverage and intensity of organized severe storms on five levels, from Marginal (1) to High (5); “Thunderstorms” outlines a 10% or greater chance of thunderstorms and is not a severe category. Each probability is the chance of that hazard within 25 miles of a point during the valid period. An intensity overlay marks where significant severe hazards are more likely should storms occur. An outlook is a forecast; a warning means a storm is happening or imminent. SPC’s definitions.

Coming days · Guam

2026-10-17Severe storms: Outside lower-48 outlook coverageFlash flooding: Outside lower-48 outlook coverage 2026-10-17Severe storms: Outside lower-48 outlook coverageFlash flooding: Outside lower-48 outlook coverage 2026-10-18Severe storms: Outside lower-48 outlook coverageFlash flooding: Outside lower-48 outlook coverage

These are daily outlooks, not arrival times. Days 4–8 retain SPC’s predictability and potential-too-low wording in the dated outlook controls.

Flash-flood risk

WPC outlines no excessive rainfall area at this scope. WPC’s Excessive Rainfall Outlook: a separate forecast with its own scale.

View flash-flood risk

Recent reports

Reporting period: 12Z 16 Oct – 12Z 17 Oct

0 tornado · 0 wind · 0 hail in Guam

Preliminary reports: a count of reports, not of storms. None reported is not proof that nothing happened.

View reports: map, table & download

No watches or mesoscale discussions in Guam. Watches, discussions and warnings in the Live tracker

Warnings in Guam

3 warnings touching Guam

3 warnings touch Guam, most urgent first. A warning across a state line is counted here and in the other state.

NWS alerts checked 04:59Z · Data: NOAA/NWS

Since 04:00Z: no change in the warnings.

Warnings 3

Typhoon Guam Coastal Waters; Rota Coastal Waters; Guam; Rota until 20:00Z crosses Guam and Northern Mariana Islands Track: Typhoon Warning, Guam Coastal Waters; Rota Coastal Waters; Guam; Rota
Coastal flood Guam; Rota; Tinian; Saipan until 18 Oct 18:00Z crosses Guam and Northern Mariana Islands Track: Coastal Flood Warning, Guam; Rota; Tinian; Saipan
High surf Guam; Rota; Tinian; Saipan until 18 Oct 18:00Z crosses Guam and Northern Mariana Islands Track: High Surf Warning, Guam; Rota; Tinian; Saipan

All 3 warnings touching Guam, with their full text, in the Live tracker

60 warnings elsewhere in the country: the national list.

Not an official warning service. Warnings and watches are the National Weather Service’s, outlooks and reports the Storm Prediction Center’s and the Weather Prediction Center’s (Data: NOAA/NWS, NOAA/SPC, NOAA/WPC). When a warning is issued for you, act on it, and use weather.gov or a NOAA Weather Radio for where you are.

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