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Weather conditions on bar directly above are near Lakefront. Tabs under Moon Phases refer to O'Hare (official).

Archives for SPC Convective outlook are updated daily with a live map a the beginning of the article. Touch or click map to get possible update, and follow link at end of article for referral to NOAA/NWS Storm Prediction Center. Archives for Chicago's hourly weather data were updated 24-48 hours after end of each day prior to Dec. 2020.

Tuesday, March 29, 2022

SPC Mar 29, 2022 1630 UTC Day 1 Convective Outlook

SPC 1630Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1124 AM CDT Tue Mar 29 2022 Valid 291630Z - 301200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING AND TONIGHT FROM THE LOWER MISSOURI VALLEY INTO CENTRAL TEXAS... ...SUMMARY... Severe thunderstorms are expected this evening and tonight, from the lower Missouri Valley region to central Texas. Damaging gusts, hail and a few tornadoes are possible. A deep upper low over western AZ is tracking eastward across the southern Rockies today, with the primary upper jet max forecast to rotate through the base of the trough and across much of the southern Plains tonight. As this occurs, three different regimes of strong/severe convection are expected. ...Eastern NE/Western IA... The main surface low is forecast to deepen as it moves into east-central NE by early evening. Southeasterly low-level winds will help transport a narrow corridor of 50s dewpoints and surface-based instability into parts of eastern NE and western IA, where CAM guidance is in agreement that scattered thunderstorms will form. These storms will only briefly be surface-based before they track northward across the warm front into a cooler/stable boundary-layer. There is a chance of a brief tornado or two before the storms become elevated, after which the main threat will be hail and gusty winds. ...Eastern KS/Western MO/Southern IA... A surface dryline is expected to become established later today from western OK into central KS. Temperatures in the 80s and dewpoints rising into the mid/upper 50s along the boundary will help to weaken the cap and lead to scattered thunderstorms - mainly after 23z. This activity should persist through the evening as cooling aloft and the primary cold front move into the region. Initial storms may be supercellular with all severe hazards possible. A gradual evolution to a QLCS is expected by mid-evening with damaging winds and isolated mesovortex spin-ups being the main threats. ...Southern OK into West-central TX... Surface temperatures over 90F are expected just west of the dryline over southwest OK and west-central TX this afternoon, resulting in a narrow corridor of weak cap. A few thunderstorms may form in this area, capable of large hail and damaging winds. Forecast soundings show a formidable cap is present as storms evolve off the dryline and into the warm sector. Increasing large-scale forcing will arrive after dark, helping to weaken the cap and foster more widespread convection. However, linear convective modes are likely by that time with locally damaging wind gusts the main threat. ..Hart/Wendt.. 03/29/2022 Read more CHECK UPDATE ZOOM GRAPHIC
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