(updated 3:45 pm)
Timing
- A few scattered pre-frontal showers possible through this evening..these won't be a huge deal
- Squall line will move into southern portions of the Valley around midnight before advancing towards the northern Valley by daybreak
- Storms will taper off southwest to northeast on Wednesday (late morning for southern Valley/early afternoon for northern Valley)
- Bottom Line: Impacts in Valley greatest in the 12am-2pm time-frame Wednesday depending on exact location
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| 12z High Resolution NAM Predicted Radar for 8am Wednesday |
Impacts
- Flash Flooding
- a 6-10 hour period of very heavy rainfall
- amounts will generally be in the 1-2" range with localized areas receiving up to 3"
- some areas will exceed flash flood guidance leading to small creek and stream flooding
- ponding on roadways + wet leaves will make for slick roads
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| Flash Flood Watch for Most of the Shenandoah Valley (2-3" possible) |
- Strong Winds
- non-thunderstorm winds will continue through the rest of the day into the overnight
- winds 10-20 mph with gusts as high as 45 mph (especially on ridge tops)
- scattered strong to severe straight line winds will be possible with squall line
- any thunderstorm that develops along line will be capable of transporting strong upper level winds down to the surface
- not everyone will see these winds; some areas will just see heavy rain
- scattered power outages likely
- Bottom Line:
- If you live somewhere that is typically impacted by rising creeks and streams during heavy rain events, keep an eye on them through tomorrow.
- Tie down or bring in any loose items outside
- Be prepared in case you do end up losing power
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