Alerts:
Space Weather Message Code: WARK04
Serial Number: 5349
Issue Time: 2026 May 27 2347 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 May 27 2347 UTC
Valid To: 2026 May 28 0600 UTC
Warning Conditions: Onset
Comment:
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.
Space Weather Message Code: SUMPX1
Serial Number: 131
Issue Time: 2026 May 27 1445 UTC
CANCELLED SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu
Cancel Serial Number: 130
Original Issued Time: 2026-05-27T02:28:00
Cancelled 2026-05-27 14:44 by Forecaster User duplicate
Cancelled 2026-05-27 14:44 by Forecaster User duplicateNOAA Scale: S1 - Minor
Solar-terrestrial indices for 27 May follow.
Solar flux 142 and estimated planetary A-index 11.
The estimated planetary K-index at 0600 UTC on 28 May was 2.33.
No space weather storms were observed for the past 24 hours.
No space weather storms are predicted for the next 24 hours.
Geo Magnetic Forecast:
NOAA Ap Index Forecast
Observed Ap 26 May 008
Estimated Ap 27 May 011
Predicted Ap 28 May-30 May 012-010-006
NOAA Geomagnetic Activity Probabilities 28 May-30 May
Active 40/25/25
Minor storm 10/10/05
Moderate storm 05/01/01
Strong-Extreme storm 01/01/01
NOAA Kp index forecast 28 May - 30 May
May 28 May 29 May 30
00-03UT 3.00 3.33 2.00
03-06UT 3.67 3.00 2.00
06-09UT 3.00 1.67 1.33
09-12UT 2.33 2.00 1.00
12-15UT 2.00 2.00 1.00
15-18UT 1.67 1.67 1.67
18-21UT 2.67 2.33 2.33
21-00UT 1.67 2.33 2.33
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 May 28-May 30 2026 is 3.67 (below NOAA
Scale levels).
NOAA Kp index breakdown May 28-May 30 2026
May 28 May 29 May 30
00-03UT 3.00 3.33 2.00
03-06UT 3.67 3.00 2.00
06-09UT 3.00 1.67 1.33
09-12UT 2.33 2.00 1.00
12-15UT 2.00 2.00 1.00
15-18UT 1.67 1.67 1.67
18-21UT 2.67 2.33 2.33
21-00UT 1.67 2.33 2.33
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 May 28-May 30 2026
May 28 May 29 May 30
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 May 28-May 30 2026
May 28 May 29 May 30
R1-R2 40% 40% 40%
R3 or greater 5% 5% 5%
Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts
through 30 May due to the flaring potential of the visible disk and
regions rotating onto the eastern limb.
Extended Space Weather Discussion:
Solar Activity
.24 hr Summary...
Solar activity remained at low levels. The largest event of the period
was a C3.4 flare originating from Region 4446 (S16E30, Fko/beta-gamma).
There are nine numbered regions on the visible disk. Region 4452
(N09W21, Cai/beta) showed notable growth and new flux emergence. Region
4450 (N10, L=140) decayed to plage, though unassociated transitory pores
were observed to its east and west. Region 4443 (S17W67, Hsx/alpha)
decayed into a unipolar spot as it approached the west limb following
the loss of its leading components. Regions 4453 (N11W63, Bxo/beta),
4454 (S15E61, Axx/alpha), and 4455 (N14E78, Hax/alpha) were numbered
during the period. Far-side satellite imagery from Solar Orbiter
indicates that Region 4455 is likely a large bipolar group with its
trailing opposite-polarity spots still located behind the east limb and
was numbered proactively due to its flaring potential. All other regions
continued either in slow decay or remained stable.
A faint, potentially partial-halo CME first seen in LASCO C2 imagery
around 26/2230 UTC and subsequently in GOES/CCOR1 was analyzed. No
obvious on-disk source exists. Modeling suggests a possible glancing
blow at Earth on 31 May. Additionally, narrow eruptions associated with
flaring from newly numbered Region 4444 were seen in SUVI imagery around
0200 UTC and 1330 UTC, but these features are well northward of the
ecliptic plane with no Earth-directed components. No other
Earth-directed CMEs were observed in available coronagraph imagery.
.Forecast...
Solar activity is expected to be at low to moderate levels through 30
May. There remains a chance for isolated M-class flares
(R1-R2/Minor-Moderate) driven by the eruptive potential of the southeast
sunspot groups and newly numbered Region 4454.
Energetic Particle
.24 hr Summary...
The greater than 2 MeV electron flux at geosynchronous orbit was at low
to moderate levels, with a peak flux of 403 pfu observed at 27/1155 UTC.
The greater than 10 MeV proton flux remained elevated following the S1
(Minor) solar radiation storm on 26 May, continuing a slow, gradual
decay back towards background after beginning the period near 1 pfu.
Higher energy channels (>50 MeV) remained at background levels.
.Forecast...
The greater than 2 MeV electron flux is expected to remain at low to
moderate levels through 30 May, as approaching high-speed stream
enhancements are not expected to be sufficient to raise flux levels. The
greater than 10 MeV proton flux is anticipated to continue its gradual
decline toward background levels on 28–30 May.
Solar Wind
.24 hr Summary...
Solar wind parameters remained slightly elevated and possibly indicative
of weak negative polarity coronal hole high-speed stream (-CH HSS)
influences. Total magnetic field (Bt) was fairly steady, averaging near
6.0 nT. The north-south (Bz) component displayed high variability,
oscillating between a maximum southward deflection of -7.0 nT and a
positive orientation of +6 nT. Solar wind speeds varied modestly between
350 and 425 km/s. The phi angle was predominantly in the negative
(towards the Sun) sector, though minor deviations were observed later in
the period.
.Forecast...
Solar wind parameters are expected to remain mildly enhanced due to weak
-CH HSS influences through 29 May. A return toward near-background,
nominal conditions is anticipated by 30 May.
Geospace
.24 hr Summary...
The geomagnetic field was at quiet to unsettled levels throughout the
reporting period.
.Forecast...
The geomagnetic field is anticipated to increase to unsettled levels,
with a chance for isolated active periods, on 28 May due to continued CH
HSS influences. Unsettled conditions are expected to persist on 29 May
before returning to mostly quiet levels early on 30 May as these effects
subside.
27 Day Forecast:
Date | Radio Flux | Planetary A Index | Largest Kp Index
2026 May 25 140 5 2
2026 May 26 145 8 3
2026 May 27 150 12 4
2026 May 28 140 12 4
2026 May 29 140 8 3
2026 May 30 145 5 2
2026 May 31 145 5 2
2026 Jun 01 145 5 2
2026 Jun 02 145 5 2
2026 Jun 03 150 5 2
2026 Jun 04 145 15 4
2026 Jun 05 140 5 2
2026 Jun 06 135 5 2
2026 Jun 07 135 5 2
2026 Jun 08 130 5 2
2026 Jun 09 125 12 4
2026 Jun 10 130 5 2
2026 Jun 11 130 30 6
2026 Jun 12 125 25 5
2026 Jun 13 120 12 4
2026 Jun 14 115 10 3
2026 Jun 15 115 8 3
2026 Jun 16 110 5 2
2026 Jun 17 110 5 2
2026 Jun 18 110 5 2
2026 Jun 19 115 5 2
2026 Jun 20 120 5 2
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