:Product: Geophysical Alert Message wwv.txt
:Issued: 2019 Nov 13 0605 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Geophysical Alert Message
Solar-terrestrial indices for 12 November follow.
Solar flux 71 and estimated planetary A-index 4.
The estimated planetary K-index at 0600 UTC on 13 November was 0.

No space weather storms were observed for the past 24 hours.

No space weather storms are predicted for the next 24 hours.

NOAA Alerts

Space Weather Message Code: WARK04
Serial Number: 3691
Issue Time: 2019 Nov 11 0959 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2019 Nov 11 1000 UTC
Valid To: 2019 Nov 11 2359 UTC
Warning Condition: Onset

NOAA Space Weather Scale descriptions can be found at

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.

NOAA Observations


NOAA Scales Activity

NOAA Scales Activity
Range 1 (minor) to 5 (extreme)
NOAA Scale Past 24 hrs Current Fcst 24 hrs
Geomagnetic Storms
Solar Radiation Storms
Radio Blackouts

DX Cluster WWV announcements

1429N3US(not set)
1500VE7CCSFI=66, A=3, K=0, No Storms -> Minor w/G1
1200VE7CCSFI=66, A=3, K=0, No Storms -> Minor w/G1
0900VE7CCSFI=66, A=3, K=0, No Storms -> No Storms
0600AE5ESFI=66, A=3, K=0, No Storms -> No Storms
0300VE7CCSFI=66, A=3, K=1, No Storms -> No Storms
0000W0MUSFI=66, A=3, K=0, No Storms -> No Storms
2100AE5ESFI=66, A=4, K=1, No Storms -> No Storms

Propagation Links

WWV Solar Flux with A and K indexes
Proppy: Online HF propagation predictions using ITU P.533.
Online area and point-to-point predictions using the ITU application ITURHFProp.
Band Conditions - Digital Mode Automatic Propagation Reporter
PSKreporter displays the digital mode data of transmitting and receiving stations in selectable views with additional information.
DR2W DX Propagation
DX Propagation by DR2W! High resolution SNR maps in pseudo color. Propagation based on the actual sunspot number.
WA5IYX VHF Propagation Info
Current Solar-Terrestrial/Propagation Data for Your Website
You can now add the current Solar-Terrestrial/Propagation Data to your web site for free (with no ads). This data is available as a 4k, .gif image 255 X 175, 155 X 300 or 460 X 125 stickers, in multiple color schemes. Now includes calculated propagation conditions using the index and flux numbers obtained.
Solar Cycle
Solar Cycle 24 / VHF Aurora / amateur radio website.
LX4SKY Amateur Radio Activities
History of amateur radio, propagation analysis and program reviews of VOACAP, WinCAP Wizard, DX Tool Box, and 54 other HF Prop software, portable HF operation, mystery of radials, SWR, transmission lines, basics of aerial antennas, longwire and yagi antennas, Yaesu FT1000MP Mark-V review, Kenwood TS-570D(G) review, principles of amplification, RFI solutions, and lots more.
William Hepburn's VHF/UHF Tropospheric Ducting Forecast
ON4AA On-Line HF Propagation Prediction
Learn about your current local HF propagation conditions and obtain a forecast in a snap!
Propfire HF Propagation Stats for Firefox
Propfire is a propagation utility for the Firefox webbrowser. It displays current HF propagation data in your status bar.
VOACAP Quick Guide
Guide to using VOACAP, free professional HF prediction software from NTIA/ITS.
160M Propagation
KG0VL VHF Aurora Radio Research
KV5R's Getting Started in NVIS Antenna and Propagation Experimentation
Near-Vertical Incident Skywave propagation is generally considered to be F-layer reflection at angles of 70-90 degrees. It is skywave propagation without the usual skip zone. The purpose of NVIS is to communicate locally and regionally, out to about 300 miles, with moderate power, simple antennas, and no skip zone. NVIS fills in the blank spot between groundwave and low-angle skywave.
NVIS: Near Vertical Incidence Skywave
NVIS, or Near Vertical Incidence Skywave, refers to a radio propagation mode which involves the use of antennas with a very high radiation angle, approaching or reaching 90 degrees (straight up), along with selection of an appropriate frequency below the critical frequency, to establish reliable communications over a radius of 0-200 miles or so.
Amateur Chirp Project (Ionospheric Sounding)
Amateur projects to investigate radiowave propagation - G3PLX's chirp project, ionosonde database, and more...
Basics of Radio Wave Propagation
Solar Influences Data Analysis Center