Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1236 AM CDT Fri Apr 07 2017 Valid 081200Z - 091200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS OVER A PORTION OF UTAH... ...SUMMARY... The risk for severe storms will remain low across the U.S. Saturday. ...Synopsis... A progressive upper trough will move through the West Coast states Saturday, continuing into the Great Basin during the afternoon and the central Rockies overnight accompanied by a Pacific cold front. Farther east a cold front will advance southeast through the northern Plains into the upper Mississippi Valley in association with a northern-stream shortwave trough advancing through central Canada. ...Pacific Northwest through Great Basin and Central Rockies... Bands of convection including thunderstorms will likely be ongoing within frontal zone from parts of CA into OR. In wake of the early activity, other post-frontal showers and thunderstorms may spread inland during the day in association with cold air aloft and steep lapse rates accompanying the upper trough. Convection within frontal band will continue/redevelop east into the Great Basin during the day as the atmosphere destabilizes downstream. Strong deep-layer winds will accompany the upper trough which, along with steep lapse rates and inverted-v boundary layers, may promote a marginal risk of a few locally strong to damaging wind gusts with convection developing in this region during the afternoon. ...Northern Plains... Modified continental-polar air will advect north into the central and northern Plains beneath steep lapse rates as southerly boundary-layer winds increase downstream from evolving lee trough. This process will contribute to modest instability in vicinity of the front from the Dakotas into MN. A few elevated storms may develop in this region in association with increasing isentropic ascent within the frontal zone. ..Dial.. 04/07/2017Read more
from SPC Forecast Products http://ift.tt/GB0aDL
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