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Post-Tropical Cyclone Hernan

25 kt · 29 mph · 1009 hPa

Storm Mode · NHC Advisory · 15 Aug 18:00Z

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NHC forecast for Post-Tropical Cyclone Hernan, Advisory; rendered by MaverickWX

Published advisory track · Advisory

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Analysis

Area, source times and interpretation

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Soundings: what weather balloons measured

SPC’s skew-T diagram and hodograph of the sounding at Vandenberg, CA (VBG), 12Z. Its levels are in the table below. — Observed Sounding at Vandenberg, CA (VBG), for 12:00Z (8 h 50 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 (60)

Vandenberg, CA (VBG): the surface first, then up through the atmosphere. Temperature and dew point in °C, as measured.
Pressure	Height	Temperature	Dew point	Wind
1002 mb	121 m	16.0	11.0	030° 15 kt
1000 mb	116 m	16.4	10.4	030° 15 kt
979 mb	297 m	16.8	8.8	—
944 mb	610 m	15.1	7.1	040° 14 kt
929 mb	742 m	14.4	6.4	—
925 mb	779 m	14.6	6.6	035° 6 kt
915 mb	871 m	15.0	4.0	—
878 mb	1219 m	12.8	1.8	335° 5 kt
850 mb	1490 m	11.0	0.0	280° 4 kt
816 mb	1829 m	8.9	-2.1	110° 2 kt
786 mb	2134 m	7.0	-4.0	085° 7 kt
757 mb	2438 m	5.2	-5.8	020° 5 kt
737 mb	2663 m	3.8	-7.2	—
703 mb	3048 m	0.7	-8.5	040° 11 kt
700 mb	3079 m	0.4	-8.6	035° 12 kt
679 mb	3324 m	2.2	-18.8	—
651 mb	3658 m	0.8	-26.3	025° 30 kt
627 mb	3962 m	-0.4	-33.2	010° 43 kt
604 mb	4267 m	-1.6	-40.0	005° 49 kt
581 mb	4572 m	-2.9	-46.9	—
559 mb	4877 m	-5.5	-47.4	350° 56 kt
537 mb	5182 m	-8.0	-47.8	350° 57 kt
517 mb	5486 m	-10.6	-48.3	350° 58 kt
500 mb	5740 m	-12.7	-48.7	355° 52 kt
477 mb	6096 m	-15.8	-49.1	000° 54 kt
458 mb	6401 m	-18.4	-49.5	010° 52 kt
439 mb	6706 m	-21.0	-49.8	010° 56 kt
425 mb	6950 m	-23.1	-50.1	—
406 mb	7282 m	-24.5	-53.2	010° 72 kt
400 mb	7390 m	-25.3	-54.3	010° 71 kt
371 mb	7925 m	-29.7	-56.3	000° 69 kt
355 mb	8230 m	-32.2	-57.4	350° 70 kt
340 mb	8534 m	-34.7	-58.5	350° 65 kt
326 mb	8839 m	-37.0	-59.1	340° 66 kt
312 mb	9144 m	-39.2	-58.4	340° 68 kt
300 mb	9410 m	-40.9	-62.9	335° 69 kt
285 mb	9754 m	-43.5	-64.2	330° 68 kt
273 mb	10058 m	-43.3	-66.2	330° 56 kt
261 mb	10363 m	-44.0	-67.5	340° 51 kt
250 mb	10640 m	-45.3	-68.3	340° 43 kt
238 mb	10973 m	-47.8	-68.1	340° 42 kt
227 mb	11278 m	-50.0	-67.9	335° 43 kt
216 mb	11582 m	-51.9	-68.5	330° 44 kt
206 mb	11887 m	-52.9	-71.5	315° 46 kt
200 mb	12090 m	-53.5	-73.5	310° 41 kt
188 mb	12497 m	-55.6	-74.6	310° 40 kt
171 mb	13106 m	-54.8	-79.3	300° 47 kt
155 mb	13716 m	-55.6	-82.5	295° 39 kt
150 mb	13930 m	-56.7	-82.7	300° 40 kt
134 mb	14630 m	-59.2	-84.1	295° 29 kt
122 mb	15240 m	-61.4	-85.3	270° 23 kt
111 mb	15810 m	-63.5	-86.5	265° 34 kt
100 mb	16450 m	-64.1	-86.1	280° 27 kt
85 mb	17448 m	-64.3	-88.1	285° 20 kt
74 mb	18299 m	-64.0	-89.4	200° 10 kt
64 mb	19191 m	-63.1	-90.1	020° 3 kt
54 mb	20248 m	-61.5	-90.5	—
38 mb	22466 m	-62.9	-90.9	—
27 mb	24535 m	-58.6	-89.4	290° 10 kt
19 mb	26826 m	-53.7	-87.7	—

Every station with a sounding (77)

SPC observed soundings checked 20:45Z · Data: NOAA/SPC

Storm details

NHC Advisory · 15 Aug 18:00Z

Center position: 15.8°N, 135.4°W
Minimum pressure: 1009 hPa
Maximum sustained wind: 25 kt · 29 mph
Movement: Not reported
Since comparison advisory: Comparison unavailable

Official source link not retained.

Forecast cycle Time not published. Center position belongs to the official state’s time, not imagery time.

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Data coverage

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No supported U.S. NWS monitoring area for this advisory. This does not mean no warnings worldwide.

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Impacts

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Coastal alertsCoastal alert data unavailable; not an all-clear Flooding rainOfficial rainfall context and coverage Storm surgeAvailability and coastal-only product limits Warnings in monitored areaNWS coverage unavailable here; not a global all-clear

Current warnings in the monitoring area

None: no U.S. state or territory is under NHC’s coastal watches or warnings or inside the cone, Advisory. Current geographical context; these alerts are not attributed to the cyclone.

No U.S. area

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Official forecast table

Forecast points

NHC Advisory · advisory 15 Aug 18:00Z · forecast cycle Time not published. Forecast positions are future estimates, not observed imagery. Classification is shown only where published.

No official forecast points are published for this issuance. An invest is not given a fabricated cyclone forecast.

Advisory history and records

Advisory history

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Monitoring geography and current changes

Area: None: no U.S. state or territory is under NHC’s coastal watches or warnings or inside the cone, Advisory
Coastal watches and warnings: none in a U.S. state · Cone: crosses no U.S. state
Hazards: —
Window: In force now, with this advisory’s forecast
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Forecast track

The official forecast track, drawn by this site from NHC’s Advisory (18:00Z). Not an official NHC product. Data: NOAA/NHC.

Wind speed probabilities

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NHC’s coastal watches and warnings

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Intensity forecast

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Satellite

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Imagery from NASA GIBS: NOAA GOES and JMA Himawari.

Model guidance

The models’ tracks, which are not a forecast for Post-Tropical Cyclone Hernan, NHC Advisory

The models’ tracks, which are not a forecast, drawn by this site from NHC’s Advisory (18:00Z). Not an official NHC product. Data: NOAA/NHC.

Radar

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Sources

NHC advisory, as published checked 20:50Z
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NWS coverage unavailablePost-Tropical Cyclone Hernan · — alerts

No supported NWS monitoring area. Check local warning authorities.

Not checked

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.