Warning Graphic Legend Annual Tropical Cyclone Reports Best Track Archive Frequently Asked Questions (FAQ) 2009 METSAT and TC Conference 2012 TC Conference Global Tropical Hazards Outlook *new* Current Northwest Pacific/North Indian Ocean* Tropical Systems No Current Tropical Cyclone Warnings. * Includes Bay of Bengal and Arabian Sea Current Central/Eastern Pacific Tropical Systems Tropical Depression 15E (Otis) Warning #32 Final Warning Issued at 19/1600Z TC Warning Text TC Warning Graphic JMV 3.0 Data Google Earth Overlay IR Satellite Imagery Tropical Depression 17E (Norma) Warning #21 Issued at 19/1600Z TC Warning Text TC Warning Graphic JMV 3.0 Data Google Earth Overlay IR Satellite Imagery Current Southern Hemisphere Tropical Systems No Current Tropical Cyclone Warnings. Current Significant Tropical Weather Advisories ABPW10 (Western/South Pacific Ocean) Issued at 19/0600Z – ABPW10 Text – Satellite Image ABIO10 (Indian Ocean) Issued at 19/1800Z – ABIO10 Text – Satellite Image Products on this website are intended for use by U.S. government agencies. Please consult your national meteorological agency or the appropriate World Meteorological Organization Regional Specialized Meteorological Center for tropical cyclone products pertinent to your country, region and/or local area.

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Space Weather Message Code: ALTEF3 Serial Number: 2666 Issue Time: 2017 Sep 19 0500 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 2665 Begin Time: 2017 Sep 15 0830 UTC Yesterday Maximum 2MeV Flux: 31067 pfu NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

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Space Weather Advisory issued by NOAA Space Weather Prediction Center Boulder, Colorado, USA SPACE WEATHER ADVISORY OUTLOOK #17-38 2017 September 17 at 8:11 p.m. MDT (2017 September 18 0211 UTC) **** SPACE WEATHER OUTLOOK **** Summary For September 11-17 Solar radiation storms reached S1 (Minor) levels on 11-14 Sep, S2 (Moderate) levels on 11-12 Sep and S3 (Strong) levels on 11 Sep. This activity was due to effects from a R3 (Strong) radio blackout observed on 10 Sep. Geomagnetic storms reached G1 (Minor) levels on 12-16 Sep and G2 (Moderate) levels on 14-16 Sep. The G1 activity on 12-13 Sep was related to CME effects while the G1-G2 activity on 14-16 Sep was related to CH HSS effects. Outlook For September 18-24 R1-R2 (Minor-Moderate) radio blackouts are possible on 23-24 Sep due to the return of old active Region 2673. S1-S2 (Minor-Moderate) solar radiation storms are possible on 23-24 Sep with any significant flare activity after the return of old Region 2673. Data used to provide space weather services are contributed by NOAA, USAF, NASA, NSF, USGS, the International Space Environment Services and other observatories, universities, and institutions.

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Space Weather Message Code: WARK06 Serial Number: 399 Issue Time: 2017 Sep 13 0107 UTC WARNING: Geomagnetic K-Index of 6 expected Valid From: 2017 Sep 13 0105 UTC Valid To: 2017 Sep 13 0600 UTC Warning Condition: Onset NOAA Scale: G2 – Moderate NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents – Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms. Spacecraft – Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible. Radio – HF (high frequency) radio propagation can fade at higher latitudes. Aurora – Aurora may be seen as low as New York to Wisconsin to Washington state.

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120HR BECOMING EXTRATROPICAL SUBJ: TYPHOON 20W (TALIM) WARNING NR 017 1. TYPHOON 20W (TALIM) WARNING NR 017 02 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY — WARNING POSITION: 121800Z — NEAR 23.8N 126.8E MOVEMENT PAST SIX HOURS – 320 DEGREES AT 12 KTS POSITION ACCURATE TO WITHIN 025 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS – 070 KT, GUSTS 085 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 064 KT WINDS – 045 NM 125 NM NORTHWEST QUADRANT REPEAT POSIT: 23.8N 126.8E — FORECASTS: 12 HRS, VALID AT: 130600Z — 25.0N 125.2E MAX SUSTAINED WINDS – 080 KT, GUSTS 100 KT

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