Grid RO99 Band Conditions
Localized HF conditions for Maidenhead locator RO99. Coordinating at 59.50°, 179.00°. Updated with real-time telemetry from NOAA and DX cluster reports.
RO99 conditions are FAIR. Best bands: 10m, 20m, 30m, 40m, 60m. SFI: 137.
From the RO99 operating area, work the 15:27 UTC and 08:55 UTC grayline windows: probe 20m, 30m, and 40m in the 15 minutes either side while the terminator crosses RO99.
Night operation should keep 20m on watch and move to 40m as the path darkens.
This square sits in a mixed-region footprint and is best used as a planning center for portable, field-day, and home-station band decisions.
- Latitude zone
- upper mid-latitude
- Local phase
- Darkness
- Aurora exposure
- watch during geomagnetic storms
- Grayline
- 15:27 UTC / 08:55 UTC
- Best high band
- 10m
- Nearest city
- the RO99 operating area
● Local Band Quality Scorings
Use this local score for RO99, then compare the global live ranking oncurrent ham band conditionsbefore changing bands.
● Best DX Windows from RO99 — the RO99 operating area
Great-circle distance, short-path beam heading, the bands most likely open right now from RO99 to each DX region at SFI 137 / Kp 3, and a current verdict. "Open now" means a suitable band is scoring well on that path; "Try ~HH:MM" points at the next far-end grayline. Band picks and status are a planning heuristic, not a measurement.
| Target | Distance | Beam | Bands to try | Status |
|---|---|---|---|---|
| East Asia / Japan | 2,438 mi | 247° | 40m, 80m, 20m | Open now |
| North America | 3,719 mi | 73° | 40m, 20m, 80m | Open now |
| Europe | 4,846 mi | 353° | 10m, 15m, 20m | Open now |
| South Asia | 5,288 mi | 291° | 40m, 20m, 80m | Open now |
| Oceania | 6,402 mi | 205° | 40m, 20m, 80m | Open now |
| South America | 8,246 mi | 68° | 40m, 20m, 80m | Open now |
| Southern Africa | 9,787 mi | 319° | 40m, 20m, 80m | Open now |
● Band-by-Time Plan for RO99
A planning heuristic for the local day at RO99, built from sunrise 15:27 UTC, sunset 08:55 UTC, SFI 137, and Kp 3. Not a measurement — a starting point for where to listen as the day turns.
Grayline enhancement — low bands reach long distances as the terminator passes.
High bands rising with the sun; check 10m for DX.
Peak high-band window — 10m and 15m open widest.
Second grayline peak — 20m holds, then hands off to 40m.
Low bands own the darkness — 40m for DX, 80m regional.
Recent local activity
Spots touching RO99 and the adjacent squares
These are the newest 10m, 15m, and 20m reports where one side of the path sits in RO99, RP90, RO98, AO09, RO89. This gives the page unique, local context instead of a generic solar snapshot.
Top DX targets
Where this grid is reaching right now
Contest preview
Next major contest outlook
No contest event is currently loaded. For planning from RO99, start with 10m POOR, 15m POOR, 20m FAIR and keep 20m available as the safest all-around fallback.
Open contest calendarNearby grids
Four adjacent squares for internal path checking
Regional hub links