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:Product: NOAA 3-day Geomagnetic Forecasts :Issued: 2026 Jun 14 2200 UTC # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # NOAA Ap Index Forecast Observed Ap 13 Jun 013 Estimated Ap 14 Jun 008 Predicted Ap 15 Jun-17 Jun 008-012-010 NOAA Geomagnetic Activity Probabilities 15 Jun-17 Jun Active 20/35/20 Minor storm 05/20/05 Moderate storm 01/05/01 Strong-Extreme storm 01/01/01 NOAA Kp index forecast 15 Jun - 17 Jun Jun 15 Jun 16 Jun 17 00-03UT 2.67 2.67 2.00 03-06UT 3.00 3.67 2.67 06-09UT 2.67 3.67 3.00 09-12UT 1.67 2.67 2.67 12-15UT 1.67 1.67 2.00 15-18UT 1.00 1.67 2.33 18-21UT 1.67 1.67 1.67 21-00UT 1.67 2.00 2.67

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 165 Issued at 2200Z on 14 Jun 2026 IA. Analysis of Solar Active Regions and Activity from 13/2100Z to 14/2100Z: Solar activity has been at low levels for the past 24 hours. There are currently 4 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is expected to be low with a slight chance for an M-class flare on days one, two, and three (15 Jun, 16 Jun, 17 Jun). IIA. Geophysical Activity Summary 13/2100Z to 14/2100Z: The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 549 km/s at 14/0045Z. Total IMF reached 5 nT at 14/1033Z. The maximum southward component of Bz reached -3 nT at 13/2102Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 1581 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on days one and three (15 Jun, 17 Jun) and quiet to active levels on day two (16 Jun). III. Event probabilities 15 Jun-17 Jun Class M 15/15/15 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 14 Jun 128 Predicted 15 Jun-17 Jun 120/118/118 90 Day Mean 14 Jun 126 V. Geomagnetic A Indices Observed Afr/Ap 13 Jun 015/013 Estimated Afr/Ap 14 Jun 007/008 Predicted Afr/Ap 15 Jun-17 Jun 009/008-010/012-010/010 VI. Geomagnetic Activity Probabilities 15 Jun-17 Jun A. Middle Latitudes Active 15/30/15 Minor Storm 05/15/05 Major-severe storm 01/01/01 B. High Latitudes Active 20/15/15 Minor Storm 25/25/25 Major-severe storm 20/40/25

Product: 3-Day Forecast Issued: 2026 Jun 14 1230 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center A. NOAA Geomagnetic Activity Observation and Forecast The greatest observed 3 hr Kp over the past 24 hours was 4 (below NOAA Scale levels). The greatest expected 3 hr Kp for Jun 14-Jun 16 2026 is 3.67 (below NOAA Scale levels). NOAA Kp index breakdown Jun 14-Jun 16 2026 Jun 14 Jun 15 Jun 16 00-03UT 2.33 2.67 2.67 03-06UT 2.00 3.00 3.67 06-09UT 1.33 2.67 3.67 09-12UT 2.00 1.67 2.67 12-15UT 1.67 1.67 1.67 15-18UT 1.67 1.00 1.67 18-21UT 2.67 1.67 1.67 21-00UT 2.67 1.67 2.00 Rationale: No G1 (Minor) or greater geomagnetic storms are expected. No significant transient or recurrent solar wind features are forecast. B. NOAA Solar Radiation Activity Observation and Forecast Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was below S-scale storm level thresholds. Solar Radiation Storm Forecast for Jun 14-Jun 16 2026 Jun 14 Jun 15 Jun 16 S1 or greater 1% 1% 1% Rationale: No S1 (Minor) or greater solar radiation storms are expected. No significant active region activity favorable for radiation storm production is forecast. C. NOAA Radio Blackout Activity and Forecast No radio blackouts were observed over the past 24 hours. Radio Blackout Forecast for Jun 14-Jun 16 2026 Jun 14 Jun 15 Jun 16 R1-R2 10% 10% 10% R3 or greater 1% 1% 1% Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio blackouts over 14-16 Jun.

Product: Forecast Discussion Issued: 2026 Jun 14 1230 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center Solar Activity .24 hr Summary... Solar activity continued at low levels. Region 4465 (N08W04, Cao/beta) developed a few rudimentary leader spots, and new Region 4468 (N10E46, Cro/beta) was numbered this period. The remaining regions were either stable or in decay. The strongest flare of the period was a C2.5/Sf at 13/1309 UTC associated with a filament eruption near S21W73. The subsequent CME, first observed in LASCO C2 imagery off the SW at 13/1326 UTC, is expected to miss Earth. .Forecast... Solar activity is expected to remain at low levels through 16 Jun, with a slight chance for M-class (R1-R2/Minor-Moderate) flares. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux reached high levels, with a peak flux of 1,519 pfu. The greater than 10 MeV proton flux remained at background levels. .Forecast... The greater than 2 MeV electron flux is likely to reach high levels on 14-16 Jun. The greater than 10 MeV proton flux is expected to continue at background levels through 16 Jun. Solar Wind .24 hr Summary... Solar wind parameters reflected the continued influence of a negative polarity CH HSS, with some lingering CME enhancements early in the period. Total field strength reached 7 nT, and the Bz component varied between +/-5 nT. Solar wind speeds gradually decreased from a peak near 625 km/s early in the period to a low of around 475 km/s by the end of the period. .Forecast... The solar wind environment is expected to remain mildly enhanced over 14-15 Jun under continued, but waning -CH HSS influences. An additional enhancement is likely on 16 Jun due to the anticipated glancing-blow arrival of a CME from 12 Jun. Geospace .24 hr Summary... The geomagnetic field was at mostly quiet to unsettled levels, with an isolated active period, under -CH HSS and CME influences. .Forecast... The geomagnetic field is expected to be at quiet to unsettled levels, with a chance for active conditions, on 14-15 Jun as -CH HSS influences slowly diminish. Periods of active conditions are likely on 16 Jun due to the anticipated glancing-blow arrival of a CME that left the Sun on 12 Jun.

Space Weather Message Code: WATA30 Serial Number: 276 Issue Time: 2026 Jun 14 0830 UTC CANCELLED WATCH: Geomagnetic Storm Category G2 Predicted Cancel Serial Number: 275 Original Issued Time: 2026 Jun 11 2029 UTC G1 (Minor) geomagnetic storm conditions are no longer expected. G1 (Minor) geomagnetic storm conditions are no longer expected. 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.

Product: Forecast Discussion Issued: 2026 Jun 14 0030 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center Solar Activity .24 hr Summary... Solar activity continued at low levels. All active regions were either mostly stable or in gradual decay. The strongest flare of the period was a C2.5/Sf flare at 13/1309 UTC associated with a filament eruption near the SW limb. Subsequent GOES-19 CCOR-1 coronagraph imagery contained a CME signature towards the SW beginning at 13/1345 UTC. Analysis and modeling of the event indicated a miss well ahead of Earth. .Forecast... Solar activity is expected to remain at low levels through 16 Jun, with a slight chance for M-class (R1-R2/Minor-Moderate) flares. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux reached high levels, with a peak flux of 1,519 pfu. The greater than 10 MeV proton flux remained at background levels. .Forecast... The greater than 2 MeV electron flux is expected to continue to reach high levels over 14-16 Jun. The greater than 10 MeV proton flux is expected to continue at background levels through 16 Jun. Solar Wind .24 hr Summary... Solar wind parameters reflected influence from a negative polarity CH HSS, with a slight enhancement in IMF noted at 13/0952 UTC, which may be associated with arrival of transient influence anticipated for early to midday on 13 Jun. Total magnetic field strength increased from a steady 5 nT during the HSS to a peak of 8 nT at 13/0900 UTC. The Bz component briefly reached as far south as -6 nT. Solar wind speeds increased from a steady ~550 km/s to a peak of ~674 km/s at 13/1026 UTC, then returned to near 550 km/s by the end of the period. .Forecast... The solar wind environment is expected to remain enhanced over 14-16 Jun due to continued -CH HSS influences. Additional enhancements are possible over 14 Jun with the anticipated passage of CMEs from 09 and 11 Jun, and again on 16 Jun with the likely glancing blow of the CME from 12 Jun. Geospace .24 hr Summary... The geomagnetic field was at mostly quiet to unsettled levels, with an isolated active period, under -CH HSS and CME influences. .Forecast... The geomagnetic field is likely to reach G1 (Minor) storm levels on 14 Jun due to -CH HSS influences and the passage of CMEs that left the Sun on 09 Jun and 11 Jun. Periods of active conditions are likely on 15-16 Jun as -CH HSS influences persist, with possible weak interactions with the CME from 12 Jun.

Product: 3-Day Forecast Issued: 2026 Jun 14 0030 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center A. NOAA Geomagnetic Activity Observation and Forecast The greatest observed 3 hr Kp over the past 24 hours was 4 (below NOAA Scale levels). The greatest expected 3 hr Kp for Jun 14-Jun 16 2026 is 4.67 (NOAA Scale G1). NOAA Kp index breakdown Jun 14-Jun 16 2026 Jun 14 Jun 15 Jun 16 00-03UT 4.67 (G1) 2.67 2.67 03-06UT 3.67 3.00 3.67 06-09UT 2.67 3.67 2.67 09-12UT 2.67 3.00 2.67 12-15UT 1.67 2.67 2.67 15-18UT 1.67 1.67 1.67 18-21UT 2.67 1.67 1.67 21-00UT 2.67 2.00 2.67 Rationale: The geomagnetic field is likely to reach G1 (Minor) storm levels on 14 Jun due to -CH HSS influences and the passage of CMEs that left the Sun on 09 Jun and 11 Jun. B. NOAA Solar Radiation Activity Observation and Forecast Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was below S-scale storm level thresholds. Solar Radiation Storm Forecast for Jun 14-Jun 16 2026 Jun 14 Jun 15 Jun 16 S1 or greater 5% 5% 5% Rationale: No S1 (Minor) or greater solar radiation storms are expected. No significant active region activity favorable for radiation storm production is forecast. C. NOAA Radio Blackout Activity and Forecast No radio blackouts were observed over the past 24 hours. Radio Blackout Forecast for Jun 14-Jun 16 2026 Jun 14 Jun 15 Jun 16 R1-R2 20% 20% 20% R3 or greater 1% 1% 1% Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio blackouts on 14-16 Jun.

Space Weather Message Code: WARK04 Serial Number: 5365 Issue Time: 2026 Jun 13 2356 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 5364 Valid From: 2026 Jun 13 0126 UTC Now Valid Until: 2026 Jun 14 0600 UTC Warning Condition: Persistence NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.