Routine Space Environment Product (Daily)
Issued by NWS

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000
FXXX10 KWNP 260030
DAYTDF

:Product: 3-Day Forecast
:Issued: 2017 Apr 26 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 4 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for Apr 26-Apr 28 2017 is 5 (NOAA Scale
G1).

NOAA Kp index breakdown Apr 26-Apr 28 2017

            Apr 26     Apr 27     Apr 28
00-03UT        2          4          3
03-06UT        2          3          3
06-09UT        3          3          3
09-12UT        2          3          3
12-15UT        2          3          2
15-18UT        3          2          2
18-21UT        4          2          3
21-00UT        5 (G1)     3          3

Rationale: Isolated G1 (Minor) storm levels are likely on day one (26
Apr) as CH HSS influences persist.

B. NOAA Solar Radiation Activity Observation and Forecast

Solar radiation, as observed by NOAA GOES-13 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for Apr 26-Apr 28 2017

              Apr 26  Apr 27  Apr 28
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 Apr 26-Apr 28 2017

              Apr 26        Apr 27        Apr 28
R1-R2            1%            1%            1%
R3 or greater    1%            1%            1%

Rationale: No R1 (Minor) or greater radio blackouts are expected.  No
significant active region flare activity is forecast.



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