DarkSky Temps | Gusts | WU KORD Data

CLICK for this month's BIG night sky ...

RADAR FULL MAP SCREEN

NEXRAD

STORMTRACK

Cardinal SAT

CHGOWX.COM


Archives for Chicago's hourly weather data updated 24-48 hours after end of each day. MOBILE CHGOWX.COM ...
Weather conditions on bar directly above are near Lakefront. Weather conditions with Moon are O'Hare (official).

Saturday, August 21, 2021

SPC Aug 21, 2021 0600 UTC Day 2 Convective Outlook

SPC 0600Z Day 2 Outlook Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 0100 AM CDT Sat Aug 21 2021 Valid 221200Z - 231200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS OF THE NORTHERN AND CENTRAL PLAINS... ...SUMMARY... A few severe storms are expected across an area including parts of the central and northern Plains/Mid Missouri Valley region on Sunday. A brief tornado, and locally strong convective wind gusts, may also accompany the landfall of tropical system Henri into southeastern New York/southern New England. ...Synopsis... The upper flow field over the western U.S. will be characterized by persistent, longer-wavelength troughing, with a short-wave feature ejecting east-northeastward out of the Rockies and across the northern Plains, while a second trough/low digs southward out of western Canada toward/into the Pacific Northwest. A weak cold front associated with the ejecting northern Plains system will move eastward across the Plains through the period. East of the Rockies, ridging centered over the south-central U.S. will continue to prevail, while tropical system Henri affects the New England vicinity through the period. ...Parts of the central and northern Plains... Early/ongoing convection across portions of the outlook area may prove to be somewhat problematic with respect to evolution of the thermodynamic environment in some areas. Still, ample afternoon destabilization of a warm-sector airmass is expected across at least portions of Kansas and much of Nebraska, northward into the Dakotas. As the upper short-wave system crosses the Dakotas, convective redevelopment is expected. Weaker CAPE, but more favorably strong/veering flow aloft suggests at least some severe risk northward into North Dakota, while more unstable but somewhat less-sheared conditions favor more widespread storms farther south, with isolated, all-hazards severe potential. Given this potential, likely maximized through late afternoon/early evening before diminishing with diurnal stabilization, SLGT categorical risk will be maintained across this region. ...Long Island into southern New England... Tropical system Henri -- forecast by the latest NHC updates to move onshore over Long Island during the day Sunday -- will be accompanied by widespread strong winds and heavy rainfall. With little instability expected inland, thunderstorm activity in outer bands will likely be muted to some degree. Still, a few stronger convective cells in bands within the northeast quadrant of the storm may prove capable of convectively enhanced wind gusts, and possibly a brief tornado or two, through the period. ..Goss.. 08/21/2021 Read more LIVE: spc.noaa.gov
http://dlvr.it/S63FFC