NZUS93 KDVN 282216
LLLDVN
IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-009-015>018-
024>026-034-035-MOZ009-010-291016-

Public Information Statement
National Weather Service Quad Cities IA IL
516 PM CDT Mon Apr 28 2025

Hi everyone. Heres an update from our 4 PM (21Z) weather balloon data (what we call a sounding).
The left-most is the raw data, the right-most is adapted for surface temperature of 82° and dew point of 66°. Keys:
A lot of wind! Hence the 35 to 43 mph gusts across especially our IA CWA, and why supercells would be the mode if any storms can develop through mid-evening (including elevated ones)
Warmer air aloft compared to rising air parcels (cap), thats not much at all in magnitude but still has ~6,000 ft depth. Thats keeping a lid on things now. Well see the rate of change in 90 mins when we send up our next balloon. This should gradually dissipate with cooler air moving. Some models are likely too overdone with storms developing in the next couple hours, while there a couple that are likely too strong with the cap too.
Very steep lapse rates aloft. If some storms can get sustained (i.e. have some width to their updraft and duration), it would not make much for a large hail threat (and significant hail of 2+ would seem in play too)
Bottom line, is the conditional severe weather threat continues (i.e. dependent on sustained storms).

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