Annular mean (200–800 km) from latest GFS 0.25° analysis at storm center. Parcel theory off — column is environmental, not a sounding launch.
Shear by layer
Helmholtz deep-layer shear for every layer choice — x: layer bottom, y: layer top. Vortex removed within 500 km; shear averaged over the 0–400 km core. Fixed 0–40 kt scale (blue→red) so colors mean the same shear on every storm.
Opens the official advisory from the responsible agency (NHC or JTWC).
Reconnaissance
Intensity (Saffir-Simpson)
TD (<34 kt)
TS (34–63 kt)
Cat 1 (64–82 kt)
Cat 2 (83–95 kt)
Cat 3 (96–112 kt)
Cat 4 (113–136 kt)
Cat 5 (137+ kt)
Active Storms
Select a storm to open its satellite detail
No active storms.
Storms appear here when systems are active in any basin.
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No active storms.
Storm animations appear here when systems are active in any basin.
Position—
Motion—
Shear—
Satellite—
Enhanced IR
No center fix available for this frame.
Diagnostics require a detected eye (storms ≥ 65 kt).
Water Vapor 6.2 µm (Upper-Trop)
Center Fix Track
Storm Environment
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— kt— hPa—
Motion: —
Intensity History (6 h)
Vertical Wind Shear
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DeepMind WeatherLab Forecast
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Reconnaissance
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IR Asymmetry (WN-1)
Microwave—
180290 K
Microwave passes — last 24h
Tap any pass to open the IR ↔ Microwave comparison.
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No Active Tropical Cyclones
Check back during an active storm for satellite imagery.
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1x
Subseasonal State & Tropical Convection
Current MJO / BSISO phase + 60-day Wheeler-Kiladis-filtered OLR
Hovmöllers. Active TCs are projected onto each Hovmöller as a
vertical longitude trace so you can see whether a storm is
riding a convective envelope or wave.
Tropical Convection · Last 60 Days
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Seasonal SST & ACE Diagnostics
Pre-season and intra-season SST evolution from OISST v2.1,
anchored against the 1991-2020 climatology and historical
annual ACE (1982-present, NHC).
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A · Live SST & Atmosphere
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−3 °C+3 °C
B · Regional Environment Evolution
C · Seasonal Evolution
ERA5 00Z analysis snapshot
Scrub through any past TC season with the chosen ERA5
environmental field underneath and IBTrACS storm
tracks materializing as the time slider advances.
All daily-archive variables (shear, level winds,
vorticity, divergence) read the 00Z synoptic
snapshot — no daily-mean smearing of transient
features. Storms remain on the map after landfall as
long as they retain a true-TC nature
(TS/TD/HU/TC/SS/SD); they fade once classified
extratropical or dissipated. Anomaly mode subtracts
the 1991-2020 climatology so you see how a given
season's environment compared to normal at each
time step.
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D · Pre-season SST × Annual ACE
E · ACE × SST Correlation
Pixel-wise Pearson correlation between monthly SST and
annual basin ACE (1982-present). Red = warm SST coincides
with active seasons; blue = warm SST coincides with quiet
seasons. Toggle raw vs detrended to
separate shared long-term warming from year-to-year coupling.
r = −0.7r = +0.7
F · Analog Seasons
Top-10 historical analogs to the target year/month.
Grid-weighted by |r| (default and
recommended) compares the full SST anomaly field
pixel-by-pixel, weighting each pixel by its absolute
correlation with the chosen basin's ACE — no region
definitions and no overlap. The other two methods
operate on the 14 fixed region-mean values (which
have some overlap, e.g. Atl basin contains MDR); use
them if you want a faster mental model or to compare.
#
Year
Distance
NA ACE
Storms
How analogs are computed
For the selected target year + month, each historical
year's region-mean SST anomaly vector is compared to
the target's vector. Smaller distance = more similar
SST pattern.
Correlation-weighted distance:d = √Σ wᵢ · (anomᵢ - target_anomᵢ)²,
where the weight wᵢ = |r(SST_region_i, ACE_basin)|
is the absolute Pearson correlation between region i's
monthly SST and the chosen basin's annual ACE
(1982-present). Regions with little linkage to ACE
(small |r|) contribute little. Weights are
re-computed per basin × month × raw|detrended.
G · Climate Indices
Derived from the same OISST record as Panels A-E. ENSO
horizontal markers at ±0.5 °C anomaly are the
conventional El Niño / La Niña thresholds. AMM proxy =
North Tropical Atlantic SST anomaly − Tropical South
Atlantic SST anomaly (sign-of-the-gradient version of
Vimont & Kossin 2007).
Reconnaissance Missions
Recent NOAA P-3 Tail Doppler Radar missions from the HRD real-time archive. Select a mission to open it in the TDR viewer.
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Real-Time TDR Analysis
Browse and visualize real-time Tail Doppler Radar analyses from NOAA P-3 reconnaissance missions.
Full-sortie in-situ (IWG1) & SFMR time series from the NOAA P-3 reconnaissance data stream. Select a mission to load its flight-level traces.
Select a mission above to view its flight-level data.
Vortex Data Messages
Decoded center fixes, minimum sea-level pressure, and peak flight-level / surface winds from NHC reconnaissance VDMs (REPNT2 / REPPN2). Select an active storm to load its messages.
Select a storm above to view its decoded vortex data messages.