FXXX10 KWNP 220031

DAYTDF



:Product: 3-Day Forecast

:Issued: 2026 Mar 22 0030 UTC

# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center

# Product description and SWPC contact on the Web

# http://www.swpc.noaa.gov/wwire.html

#

#             3-Day Forecast

#

A. NOAA Geomagnetic Activity Observation and Forecast



The greatest observed 3 hr Kp over the past 24 hours was 7 (NOAA Scale

G3).

The greatest expected 3 hr Kp for Mar 22-Mar 24 2026 is 5.67 (NOAA Scale

G2).



NOAA Kp index breakdown Mar 22-Mar 24 2026



             Mar 22       Mar 23       Mar 24

00-03UT       4.33         5.00 (G1)    4.00     

03-06UT       5.67 (G2)    5.00 (G1)    3.33     

06-09UT       5.00 (G1)    3.67         3.00     

09-12UT       4.00         2.67         2.33     

12-15UT       2.67         3.00         2.33     

15-18UT       3.33         3.00         2.33     

18-21UT       4.33         3.33         2.67     

21-00UT       5.00 (G1)    3.67         3.00     



Rationale: G2 (Moderate) geomagnetic storming is likely on 22 Mar due to

waning CME influences and the anticipated onset of CH HSS effects.

Isolated periods of G1 (Minor) geomagnetic storming are likely on 23 Mar

as CH HSS effects continue. Unsettled to active levels are expected to

prevail on 24 Mar.



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 Mar 22-Mar 24 2026



              Mar 22  Mar 23  Mar 24

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 Mar 22-Mar 24 2026



              Mar 22        Mar 23        Mar 24

R1-R2           10%           10%           10%

R3 or greater    1%            1%            1%



Rationale: Solar activity is expected to be very low with a chance for a

C-class flares and a slight chance for an M-class flare on days one,

two, and three (22 Mar, 23 Mar, 24 Mar).