What grid square is San Francisco Bay Area?

CM87 is the live DXRadar reference square for San Francisco Bay Area. The exact portable or home QTH may vary within the square, but this page tracks the center of CM87 for planning propagation.

How do I find my grid square?

Use a Maidenhead grid lookup from your GPS coordinates or street address, then compare that grid with the nearby squares linked on this page. A 4-character grid is enough for most HF planning.

What bands are open in CM87 right now?

CM87 is currently rated POOR. The best bands right now are 10m, 20m, 30m, 40m, 60m, with 10m as the main band to watch first.

Grid CM87 Band Conditions — San Francisco

Localized HF conditions for Maidenhead locator CM87. Coordinating at 37.50°, -123.00°. Updated with real-time telemetry from NOAA and DX cluster reports.

CM87 conditions are POOR. Best bands: 10m, 20m, 30m, 40m, 60m. SFI: 104.

Regional Radar

SFI

104

K-Index

0 Kp

Center Coords

37.5, -123.0

Local Phase

Daylight

Grayline window

Sunrise 14:00 UTC

Sunset 02:12 UTC from CM87

From San Francisco Bay Area, work the 14:00 UTC and 02:12 UTC grayline windows: probe 20m, 30m, and 40m in the 15 minutes either side while the terminator crosses CM87.

Best band now

10m

10m and 20m are the main daytime rate bands from this part of North America. Watch 10m first if SFI stays elevated.

Closest operating hub

San Francisco Bay Area

This square sits in USA footprint and is best used as a planning center for portable, field-day, and home-station band decisions.

Latitude zone: mid-latitude
Local phase: Daylight
Aurora exposure: low at this latitude
Grayline: 14:00 UTC / 02:12 UTC
Best high band: 10m
Nearest city: San Francisco Bay Area

● Local Band Quality Scorings

Use this local score for CM87, then compare the global live ranking oncurrent ham band conditionsbefore changing bands.

10m

EXCELLENT

15m

EXCELLENT

20m

GOOD

40m

POOR

80m

POOR

● Best DX Windows from CM87 — San Francisco Bay Area

Great-circle distance, short-path beam heading, the bands most likely open right now from CM87 to each DX region at SFI 104 / Kp 0, 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
North America	1,356 mi	78°	10m, 15m, 20m	Open now
East Asia / Japan	5,188 mi	304°	10m, 15m, 20m	Open now
South America	5,557 mi	117°	10m, 15m, 20m	Open now
Europe	5,748 mi	28°	40m, 20m, 80m	Open now
Oceania	7,294 mi	244°	10m, 15m, 20m	Open now
South Asia	8,105 mi	338°	10m, 15m, 20m	Open now
Southern Africa	10,462 mi	75°	40m, 20m, 80m	Open now

● Band-by-Time Plan for CM87

A planning heuristic for the local day at CM87, built from sunrise 14:00 UTC, sunset 02:12 UTC, SFI 104, and Kp 0. Not a measurement — a starting point for where to listen as the day turns.

Dawn grayline

around 14:00 UTC

40m · 30m · 20m

Grayline enhancement — low bands reach long distances as the terminator passes.

Morning

after 14:00 UTC

20m · 15m

Modest SFI — 20m is the daytime workhorse here.

Midday

local noon

15m · 20m

20m and 15m carry the daytime load at this SFI.

Dusk grayline

around 02:12 UTC

20m · 40m

Second grayline peak — 20m holds, then hands off to 40m.

Night

after 02:12 UTC

40m · 80m

Low bands own the darkness — 40m for DX, 80m regional.

Recent local activity

Spots touching CM87 and the adjacent squares

These are the newest 10m, 15m, and 20m reports where one side of the path sits in CM87, CM88, CM86, CM97, CM77. This gives the page unique, local context instead of a generic solar snapshot.

No fresh PSKReporter paths are cached for the immediate CM87 footprint right now. That usually means you should widen the search to the nearest regional hubs below or fall back to 20m/40m for the next operating window.

Top DX targets

Where this grid is reaching right now

No outbound targets were strong enough to rank from the current cache. Check back after the next PSKReporter refresh or switch to the regional grids below.

Contest preview

Next major contest outlook

No contest event is currently loaded. For planning from CM87, start with 10m EXCELLENT, 15m EXCELLENT, 20m GOOD and keep 20m available as the safest all-around fallback.

Open contest calendar

Nearby grids