342 FNUS71 KLWX 282153 FWSLWX Spot Forecast for MDEM Sail 250...MDEM National Weather Service Baltimore MD/Washington DC 553 PM EDT Sun Jun 28 2026 Forecast is based on forecast start time of 1800 EDT on June 28. If conditions become unrepresentative...contact the National Weather Service. Please contact our office if you have questions or concerns with this forecast. .DISCUSSION... A significant warming trend will ensue this week, with temperatures and heat indices potentially nearing or exceeding 100 degrees by the middle to end of the week. The excessive heat looks to continue into the Independence Day holiday with increasing thunderstorm chances as well. .TONIGHT... Sky/weather.........Mostly cloudy (60-70 percent) then becoming partly cloudy (35-45 percent). Scattered showers and an isolated thunderstorm this evening. Patchy fog overnight. Chance of pcpn......30 percent. Chance of thunder...28 percent. Min temperature.....Around 69. Max humidity........100 percent. Surface winds (mph).Light winds. TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Sky (%).........70 56 56 35 46 42 58 50 50 49 54 58 Weather cov.....SCT ISO PTY PTY PTY PTY Weather type....RW RW FOG FOG FOG FOG Tstm cov........SCT ISO Chc of pcpn (%).30 20 10 10 10 10 10 10 10 10 10 10 Chc of thdr (%).30 20 10 10 10 10 10 10 0 0 0 0 Temp............80 79 77 76 74 72 73 72 70 71 70 70 RH..............69 74 76 79 87 93 90 93 100 97 97 97 Surface wnd dir.NE NE E E E E N N N N N NE Surface wnd spd.3 2 2 1 1 1 0 0 0 0 0 1 Surface wnd gst.7 6 5 3 2 2 2 2 2 2 2 3 $$ Forecaster...Witt Requested by...Kevin Vaught Type of request...OTHER .TAG 2616384.0/LWX .DELDT 06/28/26 .FormatterVersion 2.0.0 .EMAIL mjoc.mdem@maryland.gov