Routine Space Environment Product (Daily)
Issued by NWS

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000
FXXX10 KWNP 201231
DAYTDF

:Product: 3-Day Forecast
:Issued: 2018 May 20 1230 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 2 (below NOAA
Scale levels).
The greatest expected 3 hr Kp for May 20-May 22 2018 is 2 (below NOAA
Scale levels).

NOAA Kp index breakdown May 20-May 22 2018

            May 20     May 21     May 22
00-03UT        1          2          2
03-06UT        1          1          2
06-09UT        2          1          1
09-12UT        1          1          1
12-15UT        1          1          1
15-18UT        1          1          1
18-21UT        2          2          1
21-00UT        2          2          2

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-15 over the past 24 hours, was
below S-scale storm level thresholds.

Solar Radiation Storm Forecast for May 20-May 22 2018

              May 20  May 21  May 22
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 May 20-May 22 2018

              May 20        May 21        May 22
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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