Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0803 PM CDT Tue Aug 04 2020 Valid 050100Z - 051200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE CENTRAL HIGH PLAINS AND VICINITY... ...SUMMARY... A brief tornado or two will remain possible with Tropical Storm Isaias across northern New England this evening, as the system moves slowly northward into Canada. Otherwise, scattered thunderstorms across western portions parts of the Great Plains will be accompanied by risk for hail and wind through this evening and possibly into the overnight hours. ...Western portions of the Plains... Several loose clusters of storms are ongoing across the Plains this evening, where isolated risk for severe weather continues. One cluster, now spreading into northwestern North Dakota, may pose continued/isolated risk for hail and locally gusty/winds over the next few hours. Another band of storms -- from central South Dakota to the Nebraska Panhandle -- will also remain capable of producing hail and locally strong wind gusts this evening. However, risk for more widespread, upscale-growing convection appears most likely across the central High Plains region and spreading south-southeastward with time this evening, as a southerly low-level jet develops over western portions of the Plains. With a north-south band of 1500 to 2500 J/kg mixed-layer CAPE over this area, and 30 to 40 kt west-northwesterlies at mid-cloud level (around 400 mb), isolated organized/severe storms will continue within the broader area of convection. With time, one or more quasi-linear bands of storms may advance across western Kansas, and into the Texas/Oklahoma Panhandle region, accompanied by local risk for damaging winds into the overnight hours. ...Northern New England... Tropical Storm Isaias -- currently centered over the central Vermont vicinity, will continue moving steadily north-northeastward toward the St. Lawrence Valley. Convective bands associated with Isaias are no longer producing inland lightning, but an occasional, weakly rotating updraft will remain possible this evening -- Mainly across northern New Hampshire and Maine. As banding shifts northward in conjunction with Isaias' advance, threat will end from south to north -- and eventually shift northward into Canada overnight. ..Goss.. 08/05/2020Read more
from SPC Forecast Products http://www.spc.noaa.gov/products/outlook/day1otlk_0100.html
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