Alerts:
Space Weather Message Code: WATA30
Serial Number: 269
Issue Time: 2026 Mar 31 2213 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Apr 01: G2 (Moderate) Apr 02: G1 (Minor) Apr 03: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
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.
Space Weather Message Code: ALTEF3
Serial Number: 3662
Issue Time: 2026 Mar 31 1454 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3661
Begin Time: 2026 Mar 22 1430 UTC
Yesterday Maximum 2MeV Flux: 1358 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Space Weather Message Code: WATA20
Serial Number: 1106
Issue Time: 2026 Mar 31 1231 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Mar 31: G2 (Moderate) Apr 01: G1 (Minor) Apr 02: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Space Weather Message Code: WATA20
Serial Number: 1105
Issue Time: 2026 Mar 31 1228 UTC
CANCEL WATCH: Geomagnetic Storm Category G1 Predicted
Cancel Serial Number: 1104
Original Issue Time: 2026 Mar 31 1227 UTC
Comment: cancelled due to incorrect date.
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Space Weather Message Code: WATA20
Serial Number: 1104
Issue Time: 2026 Mar 31 1227 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Apr 01: G2 (Moderate) Apr 02: G1 (Minor) Apr 03: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Solar-terrestrial indices for 31 March follow.
Solar flux 141 and estimated planetary A-index 7.
The estimated planetary K-index at 0900 UTC on 01 April was 1.33.
No space weather storms were observed for the past 24 hours.
Space weather for the next 24 hours is predicted to be moderate.
Geomagnetic storms reaching the G2 level are likely.
Radio blackouts reaching the R2 level are likely.
Geo Magnetic Forecast:
NOAA Ap Index Forecast
Observed Ap 30 Mar 012
Estimated Ap 31 Mar 030
Predicted Ap 01 Apr-03 Apr 024-023-018
NOAA Geomagnetic Activity Probabilities 01 Apr-03 Apr
Active 30/30/40
Minor storm 35/35/30
Moderate storm 15/15/01
Strong-Extreme storm 01/01/01
NOAA Kp index forecast 01 Apr - 03 Apr
Apr 01 Apr 02 Apr 03
00-03UT 5.00 2.67 3.67
03-06UT 4.67 2.67 3.33
06-09UT 4.33 2.00 3.00
09-12UT 4.00 3.33 3.00
12-15UT 3.00 4.00 3.00
15-18UT 2.67 4.67 3.00
18-21UT 2.00 4.33 3.33
21-00UT 2.33 4.67 3.67
Extended Three Day Forecast:
A. NOAA Geomagnetic Activity Observation and Forecast
The greatest observed 3 hr Kp over the past 24 hours was 3 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 01-Apr 03 2026 is 6.33 (NOAA Scale
G2).
NOAA Kp index breakdown Apr 01-Apr 03 2026
Apr 01 Apr 02 Apr 03
00-03UT 3.00 4.33 3.67
03-06UT 5.67 (G2) 4.00 3.33
06-09UT 6.33 (G2) 3.33 3.00
09-12UT 4.67 (G1) 2.33 3.00
12-15UT 4.33 3.00 3.00
15-18UT 4.00 4.67 (G1) 3.00
18-21UT 4.67 (G1) 4.33 3.33
21-00UT 3.67 4.67 (G1) 3.67
Rationale: G2 (Moderate) geomagnetic storming levels are likely with a
chance for isolated G3 (Strong) storm levels possible 01 Apr due to
effects from the CME associated with 30 Mar X1.4 major flare event.
Active to G1 (Minor) levels are anticipated to continue into 02 Apr as
CME effects wane alongside the forecasted onset of CH HSS activity which
is likely to cause unsettled to active levels on 03 Apr.
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 Apr 01-Apr 03 2026
Apr 01 Apr 02 Apr 03
S1 or greater 15% 15% 15%
Rationale: There is a slight chance for the greater than 10 MeV proton
flux to exceed S1 (Minor) solar radiation storm levels through 03 Apr
due to the X1.4 flare at 30/0319 UTC and anticipated arrival of its
associated CME alongside the complexity and evolution of the active
regions currently on the solar disk.
C. NOAA Radio Blackout Activity and Forecast
No radio blackouts were observed over the past 24 hours.
Radio Blackout Forecast for Apr 01-Apr 03 2026
Apr 01 Apr 02 Apr 03
R1-R2 55% 55% 55%
R3 or greater 20% 20% 20%
Rationale: Solar activity is likely to reach Minor-Moderate (R1-R2)
levels, with a slight chance for X-class flares (R3/Strong) through 03
Apr due to the complexity and evolution of the active regions currently
on the solar disk.
Extended Space Weather Discussion:
Solar Activity
.24 hr Summary...
Solar activity was at low levels with mostly Regions 4403 (N15W12,
Hsx/alpha) and 4405 (S27E18, Esi/beta-gamma) contributing to low level
C-class activity. While Regions 4399 (S16W52, Hsx/alpha), 4401 (N25W57,
Hax/alpha), 4402 (N19W41, Hrx/alpha) and 4403 decayed during the day,
there was an increase of the magnetic complexity of the Regions 4403 and
4405. There are currently 10 numbered sunspot regions on the disk.
One of the largest flares was a C1.5 peaking at 31/0055 UTC from Region
4403, associated with a Type-II burst and a narrow eruption first
observed at the coronagraph imagery (LASCO/C2) around 31/0200 UTC. No
component of this eruption is expected to impact the near-Earth
environment.
No Earth-directed CMEs were observed during the period.
.Forecast...
Solar activity is likely to reach moderate levels with R1-R2
(Minor-Moderate) flaring, with slight chance for X-class flares through
03 Apr, due to the complexity and evolution of the active regions
currently on the solar disk, particularly Regions 4405 and 4403.
Energetic Particle
.24 hr Summary...
Electrons greater than 2 MeV at geosynchronous orbit reached high levels
with a peak flux of 1,380 pfu at 31/1600 UTC. The greater than 10 MeV
proton flux at geosynchronous orbit remained at background levels during
the period.
.Forecast...
The greater than 2 MeV electron flux is likely to be reach high levels
on 01-02 Apr and return to moderate to normal levels on 03 Apr. There
is a slight chance for the greater than 10 MeV proton flux to exceed S1
(Minor) solar radiation storm levels through 03 Apr due to the X1.4
flare at 30/0319 UTC and anticipated arrival of its associated CME
alongside the complexity and evolution of the active regions currently
on the solar disk.
Solar Wind
.24 hr Summary...
Solar wind parameters were near nominal levels with solar wind speed
showing a gradual decline to about 400 km/s by the end of the period,
while total interplanetary magnetic field (Bt) remained near 5 nT. The
North-South component (Bz) was between +/-5 nT and the phi angle was in
the positive (away from the Sun) orientation for most of the period.
Transients disturbances were observed in the solar wind parameters
around 31/2200 UTC, while suprathermal ions and electron fluxes observed
at L1 continued to increase and were likely caused by the anticipated
CME from 30 Mar.
.Forecast...
Enhanced solar wind disturbances are likely on 01 Apr due to the passage
of the 30 Mar CME. CME-associated solar wind conditions are likely to
give way to CH HSS activity on 02-03 Apr.
Geospace
.24 hr Summary...
The geomagnetic activity has been at quiet to unsettled levels for the
past 24 hours.
.Forecast...
The geomagnetic field is likely to reach G2 (Moderate) storming levels
on 01 Apr with periods of G1 (minor) storming likely on 02 Apr due to
effects from the CME associated with the 30 Mar X1.4 major flare event.
Unsettled to active geomagnetic levels are anticipated on 03 Apr due to
the waning CME effects associated with a CH HSS conditions.
27 Day Forecast:
Date | Radio Flux | Planetary A Index | Largest Kp Index
2026 Mar 30 155 22 5
2026 Mar 31 152 12 4
2026 Apr 01 155 8 3
2026 Apr 02 155 5 2
2026 Apr 03 150 18 4
2026 Apr 04 145 22 5
2026 Apr 05 145 10 3
2026 Apr 06 135 15 4
2026 Apr 07 125 8 3
2026 Apr 08 118 7 2
2026 Apr 09 120 25 5
2026 Apr 10 110 40 6
2026 Apr 11 112 20 5
2026 Apr 12 115 12 4
2026 Apr 13 115 8 3
2026 Apr 14 110 7 2
2026 Apr 15 115 5 2
2026 Apr 16 115 4 2
2026 Apr 17 120 7 2
2026 Apr 18 122 48 6
2026 Apr 19 124 22 5
2026 Apr 20 130 12 4
2026 Apr 21 140 12 4
2026 Apr 22 150 8 3
2026 Apr 23 155 5 2
2026 Apr 24 160 8 3
2026 Apr 25 155 15 4
v4.16b
v4.X Release 17th Dec 2020)
Fixed New GOES and HPI inputs from noaa for Json (17/12/20).
Addded the ability to add 2 custom Magnetometers in settings (comming soon) (18/10/19).
Improved Hobart Magnetometer code. (18/18/19)
Move all presets into their own pop out side menu. (19/06/19)
Added Composite weather maps (TAS, VIC and SA), thanks to Oz forecast! (19/06/19)
UI Upgrades, Name, Logo and Website Site Changes.
Added custom line widths for most items.
Added GOES Difference (#1 - #2)
Added Ovation-prime model outputs.
v3.8x
Various Updates, New AF Index Algo. (8/12/18)
v3.6x
Added more Presets. Disabled Presets overwriting graph views (6/7/18)
Added GeoSpace Kp Model Prediction. (3/7/18)
Added SWPC Kp Forecast + Observation. (2/7/18)
Removed WingKP and USKp. :( No longer Avaliable. (2/7/18)
Removed feed from www.dunedinaurora.nz (Unreliable). (2/7/18)
Updates to latest JQuery, JQuery Mobile and AmCharts etc. (2/7/18)
Enhanced Pro setting with Dynamic Preasure. (2/7/18)
Added Quickselect preset buttons to main page. (2/7/18)
v3.5x
Added Ruru Observatory Magnetometer. (25/4/28)
Added Forecast Sub Tabset. (1/3/18)
Added Extended Discussion Text, 27Day FC (1/3/18)
Removed Dial, and Added Forecast Report. (28/2/18)
Updated A few settings for better visilation. (28/2/18)
Updated Goes-13 is Now Goes-14 (15/2/18)
Improved Commmunity Activity for faster loads.
Consolidated Proton Density / Dynamic Preasure.
Added Additional Balloon Text.
Added TAFS Visual Probability in %.
User Interface Upgrades.
Add 'Dial' for the basics, with default support.
Added one click presets.
v2.1 - v2.49
Added 'Automatic Chart Update' option in settings.
Database caching enabled, significant load time improvements.
Extension to max 96 hours of data, up from 24.
Added ACE Bt,Bx and By for comparison.
Added More User Presets.
Fixed Orentation Change Alert.
Small layout changes.
Added Header Image.
Removed Top Header to fee up Space, Refresh added to Chart Tab.
Added Community Activity Indicator
Fixed MAG value issues in graph.
Added Second Hobart MAG Source.
Updated Comment Features (Disable).
v2.0
Fixed DSCOVR B? display bug.
Added MAG Stack Feature.
Upgrade to json feeds.
Feeds are timezone and forecast aware, making them super fast.
DB Optimisation, improved DB search times.
Charts are now zoomable, allow selection and export.
Added USAF Kp, Updated Wing Kp.
Added Ovation Aurora Short Term Forecast.
Added Macquarie Island MAG feed.
Added Mawson MAG Feed.
Added Canberra Feed.
Added MAG feed from www.dunedinaurora.nz (Portobello).
Added Brendan's experemental MAG feed (Hobart).
Fixed cookie bug, One Alert is enough for landscape mode.
> v1.0 (Started 20/10/2014)
Mawson and Macquarie Island data is copyright Commonwealth of Australia (Geoscience Australia), and redistributed under Creative Commons v4.
Thanks to INTERMAGNET for promoting high standards of magnetic observatory practice in providing access to these feeds. (www.intermagnet.org).
Local Australian weather composite maps provided by Oz Forecast