Super Typhoon Champi

130 kt · 150 mph · W at 14 kt

Storm Mode · JTWC Warning 15 · 00:00Z

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Replay coverage and interpretation

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JTWC forecast for Super Typhoon Champi, Warning 15; rendered by MaverickWX

Published advisory track · Warning 15

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JTWC supplies no cone for this issuance; none is invented.

MaverickWX map · Data: JTWC · not an official graphic

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Analysis and model context

Current cached context, independently dated. Regional reference: GU; a reference within a wider monitoring area does not replace the complete warning geography. This section remains separate from the historical replay cursor and official cyclone forecast. Use Forecast to pin a retained model package.

Soundings: what weather balloons measured

SPC’s skew-T diagram and hodograph of the sounding at Little Rock, AR (LZK), 00Z. Its levels are in the table below. — Observed Sounding at Little Rock, AR (LZK), for 00:00Z (5 h 9 min ago). SPC’s graphic; the values in its panels (CAPE, shear, the indices) are SPC’s computations from these levels. Data: NOAA/SPC.

A balloon launched about an hour before the time named, measuring as it rose and drifted with the wind: the atmosphere above one place, at one time. Model soundings, which are forecasts, are not shown here.

The levels this sounding was drawn from (56)

Little Rock, AR (LZK): the surface first, then up through the atmosphere. Temperature and dew point in °C, as measured.
Pressure	Height	Temperature	Dew point	Wind
1009 mb	173 m	16.8	3.8	060° 6 kt
1000 mb	248 m	16.0	4.0	080° 9 kt
958 mb	610 m	12.7	1.7	060° 10 kt
925 mb	902 m	10.0	0.0	045° 10 kt
890 mb	1219 m	7.1	-1.1	020° 10 kt
879 mb	1323 m	6.4	-2.6	—
858 mb	1524 m	9.7	-24.1	040° 17 kt
850 mb	1600 m	10.2	-23.8	060° 15 kt
827 mb	1829 m	9.7	-16.8	050° 20 kt
797 mb	2134 m	8.6	-12.6	055° 14 kt
785 mb	2258 m	8.2	-10.8	—
768 mb	2438 m	8.4	-12.4	055° 12 kt
740 mb	2743 m	7.0	-13.2	045° 12 kt
718 mb	2992 m	6.2	-14.8	—
707 mb	3119 m	6.4	-17.6	—
700 mb	3200 m	6.0	-18.0	255° 2 kt
687 mb	3353 m	5.6	-16.5	075° 3 kt
673 mb	3521 m	5.2	-17.8	—
662 mb	3658 m	4.5	-20.1	020° 6 kt
637 mb	3962 m	3.1	-25.3	000° 9 kt
614 mb	4265 m	1.6	-30.4	—
591 mb	4572 m	-0.8	-31.2	240° 8 kt
569 mb	4877 m	-3.0	-33.8	250° 13 kt
547 mb	5182 m	-5.2	-37.1	240° 17 kt
526 mb	5486 m	-7.5	-38.8	265° 13 kt
516 mb	5637 m	-8.9	-39.9	—
506 mb	5791 m	-10.0	-34.1	255° 16 kt
500 mb	5880 m	-10.7	-30.7	275° 16 kt
488 mb	6067 m	-11.7	-32.7	—
467 mb	6401 m	-14.0	-33.6	275° 14 kt
449 mb	6706 m	-16.2	-34.5	290° 17 kt
431 mb	7010 m	-18.3	-36.6	295° 17 kt
413 mb	7315 m	-20.4	-39.1	285° 20 kt
400 mb	7560 m	-22.1	-41.1	290° 17 kt
383 mb	7877 m	-24.3	-43.3	—
350 mb	8534 m	-29.1	-48.9	290° 14 kt
335 mb	8839 m	-31.3	-51.0	285° 14 kt
322 mb	9117 m	-33.3	-52.3	—
307 mb	9449 m	-35.5	-53.8	305° 24 kt
300 mb	9610 m	-36.5	-54.5	305° 27 kt
281 mb	10058 m	-39.4	-55.6	300° 23 kt
269 mb	10363 m	-41.4	-56.7	310° 25 kt
257 mb	10668 m	-42.8	-57.8	310° 24 kt
250 mb	10850 m	-43.9	-58.9	320° 31 kt
234 mb	11278 m	-46.8	-60.1	310° 29 kt
224 mb	11582 m	-48.8	-61.6	310° 29 kt
214 mb	11887 m	-50.7	-63.0	315° 30 kt
200 mb	12320 m	-52.9	-64.9	285° 32 kt
179 mb	13027 m	-57.1	-69.1	—
168 mb	13411 m	-56.5	-68.5	310° 33 kt
153 mb	14021 m	-60.0	-72.0	305° 37 kt
150 mb	14140 m	-60.7	-72.7	305° 27 kt
138 mb	14630 m	-63.5	-74.9	295° 29 kt
126 mb	15206 m	-65.9	-76.9	—
116 mb	15704 m	-67.9	-77.9	—
100 mb	16590 m	-70.1	-80.1	305° 28 kt

Every station with a sounding (76)

SPC observed soundings checked 05:00Z · Data: NOAA/SPC

Storm details

JTWC Warning 15 · 00:00Z

Center position: 13.1°N, 143.4°E
Minimum pressure: Not reported
Maximum sustained wind: 130 kt · 150 mph
Movement: W at 14 kt
Change from comparison: Wind 0 kt · pressure Not comparable
Compared with Warning 14 · 17 Oct 18:00Z

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Forecast cycle 00:00Z. Center position belongs to the official state’s time, not imagery time.

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Advisory comparison

Compare with

Show previous forecast as a dashed line

Solid: Warning 15 · 00:00Z
Dashed: Warning 14 · 17 Oct 18:00Z

Compare positions and intensity

Solid: JTWC Warning 15 · 00:00Z
Dashed: JTWC Warning 14 · 17 Oct 18:00Z. Comparison uses each record’s own geometry. A revision is not a landfall or impact prediction.

Current-state revision (two separate official issuances)
Field	Selected issuance	Comparison issuance	Change
Maximum sustained wind	130 kt · 150 mph	130 kt · 150 mph	0 kt
Minimum pressure	Not reported	934 hPa	Not comparable
Center position	13.1°N, 143.4°E	13.1°N, 144.8°E	Different observation times; not a forecast shift

Forecast comparison unavailable: these records have no matching forecast valid times. No interpolation or six-hour step is assumed.

Data coverage

JTWC has no NHC cone, NHC wind probabilities or NHC civil coastal warnings. Local national services remain the warning authorities.

Geographic context: Natural Earth boundaries and representative place labels. Radar coverage is limited offshore. Satellite pixels keep their source palette and actual observation time. Missing imagery is not clear weather.

Lightning activity — GOES GLM

Total lightning, including in-cloud activity. Not ground-strike locations or a safe-to-go-outside signal.

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Cached lightning source details and text readings

Map layers, imagery opacity and source clocks

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Potential impacts and monitoring context

Current NWS monitoring states: GU, MP

Coastal alertsLocal national warning authorities apply Flooding rainOfficial rainfall context and coverage Storm surgeAvailability and coastal-only product limits Nearby severe warnings0 severe/flash-flood warnings in the named monitoring area · source current

Current warnings in the monitoring area

U.S. territories JTWC’s forecast track passes within 300 nm of, Warning 15: Guam and Northern Mariana Islands. Current geographical context; these alerts are not attributed to the cyclone.

In force in this area 4

Typhoon Warning1until 16:45Z
Coastal Flood Warning1until 18:00Z
High Surf Warning1until 18:00Z
Flood Watch1until 08:00Z

Every alert in this area, most urgent first

Typhoon WarningGuam; Rota; Guam Coastal Waters; Rota Coastal Watersuntil 16:45Z · NWS Tiyan GU
Coastal Flood WarningGuam; Rotauntil 18:00Z · NWS Tiyan GU
High Surf WarningGuam; Rotauntil 18:00Z · NWS Tiyan GU
Flood WatchGuam; Rotauntil 08:00Z · NWS Tiyan GU

Most urgent first, by the Briefing’s ranking. Checked 05:09Z.

Typhoon Warning
Guam; Rota; Guam Coastal Waters; Rota Coastal Waters
Typhoon Warning issued October 18 at 3:01PM ChST by NWS Tiyan GU
Issued 17 Oct 12:39Z · ends 16:45Z
Official Typhoon Warning bulletin
Coastal Flood Warning
Guam; Rota
Coastal Flood Warning issued October 18 at 12:00PM ChST until October 19 at 4:00AM ChST by NWS Tiyan GU
Issued 17 Oct 21:55Z · ends 18:00Z
Official Coastal Flood Warning bulletin
High Surf Warning
Guam; Rota
High Surf Warning issued October 18 at 12:00PM ChST until October 19 at 4:00AM ChST by NWS Tiyan GU
Issued 17 Oct 21:55Z · ends 18:00Z
Official High Surf Warning bulletin
Flood Watch
Guam; Rota
Flood Watch issued October 18 at 4:12AM ChST until October 18 at 6:00PM ChST by NWS Tiyan GU
Issued 17 Oct 18:12Z · ends 08:00Z
Official Flood Watch bulletin

Official forecast table

Official forecast positions and intensity

JTWC Warning 15 · advisory 00:00Z · forecast cycle 00:00Z. Forecast positions are future estimates, not observed imagery. Classification is shown only where published.

Published official forecast; no interpolated positions or winds
Valid time / lead	Position	Classification	Sustained wind
12:00Z +12 h from forecast cycle	13.6°N, 141.2°E	super typhoon	135 kt · 155 mph
19 Oct 00:00Z +24 h from forecast cycle	14.4°N, 139.3°E	super typhoon	140 kt · 161 mph
19 Oct 12:00Z +36 h from forecast cycle	15.4°N, 137.3°E	super typhoon	140 kt · 161 mph
20 Oct 00:00Z +48 h from forecast cycle	16.4°N, 135.1°E	super typhoon	140 kt · 161 mph
20 Oct 12:00Z +60 h from forecast cycle	17.5°N, 132.5°E	super typhoon	135 kt · 155 mph
21 Oct 00:00Z +72 h from forecast cycle	18.6°N, 130.0°E	super typhoon	135 kt · 155 mph
22 Oct 00:00Z +96 h from forecast cycle	20.3°N, 126.8°E	typhoon	125 kt · 144 mph
23 Oct 00:00Z +120 h from forecast cycle	21.8°N, 124.1°E	typhoon	105 kt · 121 mph

Advisory history and records

Retained advisory records

Return to latest advisory

Each entry selects one immutable snapshot. Intermediate, special and corrected records are separate identities where retained. Current NWS context is labelled separately. Historical impact manifests are not retained by this index; newer impacts are never attached to an earlier advisory. Same-time corrections replaced in the publisher’s index cannot be selected unless still listed.

Advisory history; retained records only
Official issuance	Revision kind	Record
JTWC Warning 15 · 00:00Z	advisory	Snapshot 8da30f44 · Selected
JTWC Warning 14 · 17 Oct 18:00Z	advisory	Snapshot 066b411c
JTWC Warning 13 · 17 Oct 12:00Z	advisory	Snapshot 7b6b7d88
JTWC Warning 12 · 17 Oct 06:00Z	advisory	Snapshot adcb8e93
JTWC Warning 11 · 17 Oct 00:00Z	advisory	Snapshot 0bf22ebc
JTWC Warning 10 · 16 Oct 18:00Z	advisory	Snapshot eea89e7f
JTWC Warning 8 · 16 Oct 06:00Z	advisory	Snapshot ff92eaa6
JTWC Warning 7 · 16 Oct 00:00Z	advisory	Snapshot 9d193cf4
JTWC Warning 6 · 15 Oct 18:00Z	advisory	Snapshot 4d09f045
JTWC Warning 5 · 15 Oct 12:00Z	advisory	Snapshot 7447d924
JTWC Warning 4 · 15 Oct 06:00Z	advisory	Snapshot 2d609133
JTWC Warning 3 · 15 Oct 00:00Z	advisory	Snapshot d96ff9c8
JTWC Warning 2 · 14 Oct 18:00Z	advisory	Snapshot d99cea2d
JTWC Warning 1 · 14 Oct 12:00Z	first	Snapshot 99aef0d4

Monitoring geography and current changes

Area: U.S. territories JTWC’s forecast track passes within 300 nm of, Warning 15: Guam and Northern Mariana Islands (NWS states: GU, MP)
JTWC issues no cone and no coastal segments, so the area is the territories its track reaches.
Hazards: Tornado, severe thunderstorm, flash flood, river flood, areal flood, coastal flood, tropical and other warnings, watches and advisories, and the forecasts for them
Window: In force now, with this warning’s forecast
Made by: JTWC’s own products, as this site’s pipeline published them, read again with each new warning. Watch another area

The storm’s area, by its warning centre’s products: everything listed is in force in this area, never “from this storm”.

Map

This map draws the contiguous United States, and Guam and Northern Mariana Islands are beyond it. What is in force there is listed under “In force in this area”.

What changed, last 60 minutes

since 04:23Z, when this server began watching this area

Nothing has changed since 04:23Z.

The products’ own words and times, and what is no longer in force since the last read. Never written by AI.

All published products and source descriptions

Forecast track

The official forecast track, drawn by this site from JTWC’s Warning 15 (00:00Z). Not an official JTWC product. Data: JTWC. JTWC’s own.

Intensity forecast

The official intensity forecast, drawn by this site from JTWC’s Warning 15 (00:00Z). Not an official JTWC product. Data: JTWC. JTWC’s own.

Satellite

The storm’s page shows it on NASA GIBS (NOAA GOES, JMA Himawari)’s imagery, loaded by your browser. Himawari at 3° from the storm's meridian.

Open the storm’s page

Imagery from NASA GIBS: NOAA GOES and JMA Himawari.

Model guidance

The models’ tracks, which are not a forecast for Super Typhoon Champi, JTWC Warning 15

The models’ tracks, which are not a forecast, drawn by this site from JTWC’s Warning 15 (00:00Z). Not an official JTWC product. Data: JTWC. JTWC’s own.

Flash-flood risk, Day 1

Marginal
Slight

WPC’s excessive rainfall outlook, 01:00Z to 12:00Z, issued 00:35Z: a chance of flash flooding, in four categories. Data: NOAA/WPC.

River gauges in flood

No river, coastal or lake gauge in this area is in flood, observed or forecast.

NWS’s gauges at flood stage or above in the area, worst first, each with its forecast hydrograph on Rain & rivers. Data: NOAA/NWPS.

Rain expected and rain that fell

WPC’s rain forecast and MRMS’s radar estimate of the rain that fell, on the Briefing’s map for the area.

Open Rain & rivers

Data: NOAA/WPC, NOAA/NSSL MRMS.

SPC Day 1 outlook

General Thunderstorms Risk

SPC’s Day 1 categorical outlook, valid 01:00Z to 12:00Z, issued 00:54Z. SPC’s categories, as drawn. Data: NOAA/SPC.

Watches

No tornado or severe thunderstorm watch in force in this area.

SPC’s watches, by number, matched by the counties they list. Data: NOAA/SPC.

Mesoscale discussions

No mesoscale discussion reaches this area.

SPC’s mesoscale discussions whose outline reaches the area. Data: NOAA/SPC.

Storm ingredients

SPC’s hourly mesoanalysis, observed soundings and model guidance for the area, on the Analysis tab with its own clocks.

Open the Analysis tab

Drawn by the Analysis tab’s own renderer. Data: NOAA/SPC, NOAA/NCEP.

Radar

NOAA’s radar for the area, loaded by your browser as on the Radar page.

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Live tiles; the radar keeps no last-good copy.

Sources

JTWC warning, as published checked 05:09Z
NWS warnings and SPC watches checked 05:09Z
NWS watches and advisories checked 05:09Z
SPC mesoscale discussions checked 05:09Z
SPC Day 1 outlook checked 05:05Z
WPC excessive rainfall checked 05:05Z
NWPS river gauges checked 05:05Z
Radar live tiles, no last-good copy

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.