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Tropical StormNorth Pacific

Tropical Storm Pena holds near 1,002 mb as it heads west

North Pacific — Tropical system at 1,002 mb now, per CPHC, near 10°N 170°W; nearly all forecasts show it.

Updated Wed., Nov. 11, 9:41 p.m. UTC · 183 forecast tracks from NOAA, ECMWF and Environment Canada: medium

North Pacific — Tropical system at 1,002 mb now, per CPHC, near 10°N 170°W; nearly all forecasts show it.

Quick answers

As of the Wed 11 Nov 12Z model run · updated Wed., Nov. 11, 9:41 p.m. UTC

Where is Tropical Storm Pena going?
The centre is near 10°N 170°W, moving west at about 30 km/h. The most likely path takes it near 10°N 175°W by Thursday evening.
How sure is the forecast?
Path certainty: medium. 183 of 185 show the storm, and they broadly on its early path. Little has changed since the previous run.
Do the AI and physics models agree?
Largely, yes. By Thursday evening the AI ensembles’ middle track is about 80 kilometres southeast of the physics ensembles’.

New to these maps? Read how to read a spaghetti map, or see the week’s rain and wind around the world on the globe.

What we know

Where it is. At 10 p.m. Wednesday, the centre was near 10°N 170°W. CPHC puts its central pressure at 1,002 , with maximum sustained winds near 75 km/h (as of 9 p.m. Wednesday).

How sure. 183 of 185 show the storm, and they broadly on its early path. Little has changed since the previous run.1

How strong. The global models behind these tracks can’t resolve a tropical storm’s core, so their central pressures run far too high; for its strength and warnings, follow CPHC. Fewer than one in 10 forecasts have it strengthening rapidly.

What’s uncertain

Later on. The forecasts stay fairly close together through Thursday. By Thursday evening, the is about 400 kilometres across.2

When it arrives

No town we track is within reach of this storm; it stays near 10°N 170°W.

DetailsStrength, sources and the fine print

How strong it gets

Central pressure over time. The line is the middle forecast; the band holds 8 in 10 of them. For a tropical storm these models run far too high: CPHC has it at 1,002 mb.

(lower is stronger)

Times are shown in

Where the forecasts come from

ModelTracksStatus
NOAA
31 of 3112Z
arrived 4 h 10 min ago
Latest run
ECMWF
50 of 5112Z
arrived 17 min ago
Latest run
ECMWF
51 of 5112Z
arrived 3 h ago
Latest run
NOAA
31 of 3112Z
arrived 1 h 25 min ago
Latest run
Environment Canada
20 of 2112Z
arrived 4 h 27 min ago
Latest run

Also tracking

  1. North Pacific low west of British ColumbiaLikely to pass 20–210 km S of Anchorage Wed night; 7 in 10 forecasts bring it within 160 km
  2. North Atlantic lowLikely to pass 15–130 km from A Coruña Fri night; 9 in 10 forecasts bring it within 160 km
  3. Southern Ocean lowVery deep low bottoming out near 950 mb Wed night, in the Southern Hemisphere; all 185 forecasts show it
  4. Southern Ocean lowVery deep low bottoming out near 954 mb Wed night, in the Southern Hemisphere; all 185 forecasts show it
  5. South Atlantic lowVery deep low in the Southern Hemisphere, near 958 mb now and filling; all 185 forecasts show it
  6. See all 24 storms →

Notes

  1. Forecast tracks from the 12Z model run: GEFS (31), ECMWF ENS (51), AIFS ENS (51), AIGEFS (31), GEPS (21). A single run is one high-resolution forecast; ensemble forecasts are the same model run many times with small changes.
  2. The cone encloses where the centre is expected to be about two times in three at each hour, from the spread of the forecasts, widened by 20 percent; not yet calibrated against past storms. It shows uncertainty in the track, not the size of the storm.
  3. Shading shows the share of forecasts that bring the centre within 160 kilometres of a spot at any time in the next 10 days. Rain, wind and surge can reach much farther.
  4. Times are in your time zone. Arrival windows run from the earliest to the latest closest approach across forecasts that bring the centre within about 300 miles (500 km).
  5. NOAA/NCEP.
  6. Data Source: Environment and Climate Change Canada.
  7. This service is based on data and products of the European Centre for Medium-Range Weather Forecasts (ECMWF). Source: www.ecmwf.int. Licence: CC BY 4.0.
  8. Cyclone tracks computed by Stormlines from the model fields.
  9. Reading these maps: , or the illustrated guide to spaghetti models. The week’s rain, wind and temperature everywhere: the Stormlines globe.
  10. How often these forecasts turn out right: the season’s forecast check, AI vs physics.
  11. Stormlines storm ID: L-2026-2380.

Stormlines draws every storm the world’s ensemble forecasts can see: tracks from NOAA (GEFS and the AI ensemble AIGEFS), ECMWF (ENS and the AI ensemble AIFS) and Environment Canada (GEPS), updated as each model run lands. Coastlines and place names from Natural Earth; sea areas from IHO Sea Areas, version 3 (Flanders Marine Institute, marineregions.org, CC BY 4.0; modified: simplified, some islands removed, names edited).

Not an official forecast. For warnings and decisions, follow your national weather service.

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