Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1132 PM CDT Thu Apr 06 2017 Valid 071200Z - 081200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS IN EASTERN WASHINGTON...NORTHEASTERN OREGON...NORTHERN IDAHO...AND WESTERN MONTANA... ...SUMMARY... A few thunderstorms associated with hail and strong wind gusts will be possible across eastern Oregon, eastern Washington, northern Idaho, and western Montana on Friday. ...Northern Rockies... The primary synoptic feature of interest for the forecast period will be a substantial mid-level trough over the northeastern Pacific entering the Pacific Northwest early in the period. Strong southwesterly mid-level flow will overspread much of the region immediately downstream of the trough from 12Z onward. Weak instability will develop in the region, primarily owing to very cold (-26 to -28C) mid-level temps overspreading the region and modest surface heating due to insolation, with models indicating areas of 500+ J/kg CAPE from eastern Washington eastward. At least an isolated severe hail/wind threat will develop in portions of the region from mid-morning onward as thunderstorms develop just ahead of a shortwave trough migrating through the southwesterly flow aloft across the region. This threat should be confined mostly to daytime hours in the period, with models suggesting a decrease in convective activity from about 00Z onward owing to modest height rises within the marginal risk area as the aforementioned shortwave trough moves into southwestern Canada. Elsewhere, an organized severe weather threat is not expected. ..Cook/Darrow.. 04/07/2017Read more
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