Severe thunderstorms are expected across portions of the central into southern Plains into Sunday, with large hail and severe gusts the main threats. The threat for heavy to excessive rainfall and possible flash flooding will return to the south-central U.S. Friday into this weekend. Read More >
WFO Baltimore-Washington forecasts significant wave heights in the local Coastal Waters Forecast (CWF) product. Significant wave heights are the average heights (trough to crest) of the one-third highest waves. For simplicity, significant wave heights are termed waves in the WFO Baltimore-Washington CWF.
For wave forecast guidance over the Maryland portion of the Chesapeake Bay and Tidal Potomac River, WFO Baltimore-Washington uses the NWPS model. Where the NWPS domain is incomplete and beyond the NWPS time period (102 hours), wind-wave correlations are used for wave forecasts. Those correlations are outlined below.
Generally, for wind speeds of 5 kt, waves will read "less than 1 ft." For other wind speeds, the correlations below are utilized for each marine zone. Remember that forecasts of wave heights do not include effects of wind direction relative to tidal currents. Expect higher waves when winds are blowing against tidal flow.
![[Key Bridge to Indian Head]](/images/lwx/marine/image003.gif)
| W | NW | N | NE | E | SE | S | SW | |
| 10 KT | <1 | <1 | <1 | <1 | <1 | <1 | <1 | <1 |
| 15 KT | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 20 KT | 1 | 1 | 2 | 1 | 1 | 1 | 2 | 1 |
| 25 KT | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 30 KT | 2 | 2 | 3 | 2 | 2 | 2 | 3 | 2 |
| 35 KT | 2 | 3 | 3 | 3 | 2 | 3 | 3 | 3 |
| 40 KT | 3 | 3 | 4 | 3 | 3 | 3 | 4 | 3 |
| 45 KT | 3 | 4 | 4 | 4 | 3 | 4 | 4 | 4 |
| 50 KT | 3 | 4 | 4 | 4 | 3 | 4 | 4 | 4 |
![[Indian Head to Cobb Island]](/images/lwx/marine/image004.gif)
| W | NW | N | NE | E | SE | S | SW | |
| 10 KT | <1 | 1 | <1 | <1 | <1 | 1 | <1 | <1 |
| 15 KT | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 20 KT | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 25 KT | 2 | 3 | 2 | 2 | 2 | 3 | 2 | 2 |
| 30 KT | 2 | 3 | 2 | 2 | 2 | 3 | 2 | 2 |
| 35 KT | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| 40 KT | 3 | 4 | 3 | 3 | 3 | 4 | 3 | 3 |
| 45 KT | 3 | 4 | 4 | 4 | 3 | 4 | 4 | 4 |
| 50 KT | 4 | 5 | 4 | 4 | 4 | 5 | 4 | 4 |
![[Indian Head to Cobb Island]](/images/lwx/marine/image006.gif)
| W | NW | N | NE | E | SE | S | SW | |
| 10 KT | 1 | 1 | < 1 | < 1 | 1 | 1 | < 1 | < 1 |
| 15 KT | 2 | 2 | 1 | 1 | 2 | 2 | 1 | 1 |
| 20 KT | 2 | 3 | 2 | 1 | 2 | 3 | 2 | 1 |
| 25 KT | 3 | 4 | 2 | 2 | 3 | 4 | 2 | 3 |
| 30 KT | 3 | 5 | 3 | 2 | 3 | 5 | 3 | 2 |
| 35 KT | 4 | 5 | 3 | 3 | 4 | 5 | 3 | 3 |
| 40 KT | 4 | 6 | 4 | 3 | 4 | 6 | 4 | 3 |
| 45 KT | 5 | 6 | 4 | 4 | 5 | 6 | 4 | 4 |
| 50 KT | 5 | 6 | 4 | 4 | 5 | 6 | 4 | 4 |
| W | NW | N | NE | E | SE | S | SW | |
| 10 KT | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 15 KT | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 2 |
| 20 KT | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 25 KT | 2 | 2 | 2 | 3 | 2 | 2 | 2 | 3 |
| 30 KT | 3 | 3 | 3 | 4 | 3 | 3 | 3 | 4 |
| 35 KT | 3 | 3 | 3 | 4 | 3 | 3 | 3 | 4 |
| 40 KT | 4 | 4 | 4 | 5 | 4 | 4 | 4 | 5 |
| 45 KT | 4 | 4 | 4 | 5 | 4 | 4 | 4 | 5 |
| 50 KT | 5 | 5 | 5 | 6 | 5 | 5 | 5 | 6 |
![[Chesapeake Bay - Pooles Island to Sandy Point]](/images/lwx/marine/image007.gif)
| W | NW | N | NE | E | SE | S | SW | |
| 10 KT | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 15 KT | 1 | 2 | 2 | 2 | 1 | 2 | 2 | 2 |
| 20 KT | 2 | 3 | 3 | 3 | 2 | 3 | 3 | 3 |
| 25 KT | 2 | 3 | 4 | 3 | 2 | 3 | 4 | 3 |
| 30 KT | 3 | 4 | 5 | 4 | 3 | 4 | 5 | 4 |
| 35 KT | 3 | 4 | 5 | 4 | 3 | 4 | 5 | 4 |
| 40 KT | 4 | 5 | 6 | 5 | 4 | 5 | 6 | 5 |
| 45 KT | 4 | 5 | 6 | 5 | 4 | 5 | 6 | 5 |
| 50 KT | 5 | 6 | 7 | 6 | 5 | 6 | 7 | 8 |
![[Chesapeake Bay - Sandy Point to North Beach]](/images/lwx/marine/image008.gif)
| W | NW | N | NE | E | SE | S | SW | |
| 10 KT | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 15 KT | 1 | 1 | 2 | 1 | 1 | 1 | 2 | 1 |
| 20 KT | 2 | 2 | 3 | 2 | 2 | 2 | 3 | 2 |
| 25 KT | 2 | 3 | 4 | 3 | 2 | 3 | 4 | 3 |
| 30 KT | 3 | 4 | 5 | 4 | 3 | 4 | 5 | 4 |
| 35 KT | 3 | 4 | 5 | 4 | 3 | 4 | 5 | 4 |
| 40 KT | 4 | 5 | 6 | 5 | 4 | 5 | 6 | 5 |
| 45 KT | 4 | 5 | 6 | 5 | 4 | 5 | 6 | 5 |
| 50 KT | 5 | 6 | 7 | 6 | 5 | 6 | 7 | 6 |
![[Chesapeake Bay - North Beach to Drum Point]](/images/lwx/marine/image009.gif)
| W | NW | N | NE | E | SE | S | SW | |
| 10 KT | 1 | 1 | 1-2 | 1-2 | 1 | 1 | 1-2 | 1-2 |
| 15 KT | 2 | 2 | 3 | 3 | 2 | 2 | 3 | 3 |
| 20 KT | 2 | 2 | 4 | 3 | 2 | 2 | 4 | 3 |
| 25 KT | 2 | 3 | 5 | 4 | 2 | 3 | 5 | 4 |
| 30 KT | 3 | 4 | 6 | 5 | 3 | 4 | 6 | 5 |
| 35 KT | 3 | 4 | 6 | 5 | 3 | 4 | 6 | 5 |
| 40 KT | 4 | 5 | 7 | 6 | 4 | 5 | 7 | 6 |
| 45 KT | 4 | 5 | 7 | 6 | 4 | 5 | 7 | 6 |
| 50 KT | 5 | 6 | 7 | 6 | 5 | 6 | 7 | 6 |
![[Chesapeake Bay - Drum Point to Smith Point]](/images/lwx/marine/image010.gif)
| W | NW | N | NE | E | SE | S | SW | |
| 10 KT | 1 | 1-2 | 2 | 1-2 | 1 | 1-2 | 2 | 1-2 |
| 15 KT | 2 | 2 | 3 | 2 | 2 | 2 | 3 | 2 |
| 20 KT | 3 | 3 | 4 | 3 | 3 | 3 | 4 | 3 |
| 25 KT | 4 | 4 | 5 | 4 | 4 | 4 | 5 | 4 |
| 30 KT | 4 | 4 | 6 | 5 | 4 | 5 | 6 | 5 |
| 35 KT | 5 | 5 | 7 | 6 | 5 | 6 | 7 | 6 |
| 40 KT | 5 | 5 | 7 | 6 | 5 | 6 | 7 | 6 |
| 45 KT | 6 | 6 | 8 | 7 | 6 | 7 | 8 | 7 |
| 50 KT | 6 | 6 | 8 | 7 | 6 | 7 | 8 | 7 |
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