BBS: TELESC.NET.BR Assunto: HVYRAIN: Excessive Rainfall Discussion De: COD Weather Processor Data: Fri, 20 Mar 2026 18:25:25 +0000 ----------------------------------------------------------- FOUS30 KWBC 201825 QPFERD Excessive Rainfall Discussion NWS Weather Prediction Center College Park MD 225 PM EDT Fri Mar 20 2026 Day 1 Valid 16Z Fri Mar 20 2026 - 12Z Sat Mar 21 2026 ...THERE IS A MARGINAL RISK OF EXCESSIVE RAINFALL FOR PORTIONS OF WESTERN WASHINGTON STATE... ...16Z update... Moderate to locally heavy rain continued over western Washington this morning out ahead of a cold front located ~100 miles west of the coast as of 15Z. An additional 1 to 2 inches of rain (peak amounts) are expected through the late evening within the Cascades and up to a half inch or so for the Coastal Ranges/Olympics. Ongoing river flooding and wet antecedent conditions continue to be the main driver for the Marginal Risk, but the risk area can likely be removed with the next update at 01Z as IVT values lower with the cold frontal passage. Otto ...previous discussion follows... At the beginning of the forecast period, a stubborn atmospheric river is forecast to weaken as a surface low and attendant cold front progress eastward into the Pacific Northwest. Even so, moderate IVT values on the order of 500-700 kg/m * s directed into the WA coastline from 12-18Z should maintain the threat of locally heavy rainfall ahead of the front. While hourly rainfall rates will likely remain below 0.5 inches per hour, isolated instances of excessive rainfall remain possible in upslope regions of the Olympics and Cascades owing to antecedent rainfall over the last few days. Asherman Day 2 Valid 12Z Sat Mar 21 2026 - 12Z Sun Mar 22 2026 The probability of rainfall exceeding flash flood guidance is less than 5 percent. Pereira Day 3 Valid 12Z Sun Mar 22 2026 - 12Z Mon Mar 23 2026 The probability of rainfall exceeding flash flood guidance is less than 5 percent. Pereira Day 1 threat area: https://urldefense.com/v3/__https://www.wpc.ncep.noaa.go= v/qpf/94epoints.txt__;!!DZ3fjg!97AgK-MK0_ot8rEAkFLQJjgfYDter0GJF1TLhbP_8Jm-= EWvXiNZyuwRmV637wHJUCWIOJb9aBxiHJwvb9oi2q6Np1pA$=20 Day 2 threat area: https://urldefense.com/v3/__https://www.wpc.ncep.noaa.go= v/qpf/98epoints.txt__;!!DZ3fjg!97AgK-MK0_ot8rEAkFLQJjgfYDter0GJF1TLhbP_8Jm-= EWvXiNZyuwRmV637wHJUCWIOJb9aBxiHJwvb9oi2N5P2Dog$=20 Day 3 threat area: https://urldefense.com/v3/__https://www.wpc.ncep.noaa.go= v/qpf/99epoints.txt__;!!DZ3fjg!97AgK-MK0_ot8rEAkFLQJjgfYDter0GJF1TLhbP_8Jm-= EWvXiNZyuwRmV637wHJUCWIOJb9aBxiHJwvb9oi2WMpPUeM$=20 =3D =3D =3D To unsubscribe from WX-STORM and you already have a login, go to https://lists.illinois.edu and use the "Unsubscribe" link. Otherwise email Chris Novy at cnovy@cox.net and ask to be removed from WX-STORM. --- SBBSecho 3.28-Linux * Origin: Capitol City Online (1:2320/107) ----------------------------------------------------------- [Voltar]