IEM Daily Bulletin for Jul 16 2024

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 16 July 2024

News

No news is good news

IEM Code Pushes <to branch> on Github

• Jul 16 5:11 AM <main> fix: timezone of LSRs

Daily Feature

Daily Max Feels Like
Date: 15 Jul 05:30 AM
Votes: Good: 13   Bad: 0 Abstain: 0

It certainly felt like summer in Iowa over the weekend with heat index values reaching the triple digits for much of the state. The featured chart is an attempt at computing a climatology for daily maximum feels like temperature (combination of wind chill and heat index). An immediate caveat is that during the cold season, this metric isn't all that intuitive as it represents the warmest daily wind chill and not the coldest. That aside, the plot is based on period of record hourly or better observations from Des Moines with the present day heat index and wind chill equations applied to the archive. The top panel shows a smoothed presentation of the climatology with the blue dots representing the 2024 observations. Since the climatology is smoothed over seven days, the observations can sometimes appear outside of the bounds. The bottom panel shows the daily frequency of having a maximum heat index of at least 100 degrees. The middle of July is certainly the peak time of year for such hot conditions. We'll have another such day on Monday before cooler weather arrives for the rest of the week.

The featured media can be generated on-demand here

.

NWS Watch/Warning Summary for 12 AM 15 Jul 2024 - 12 AM 16 Jul 2024 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	51	10	0	10	2	1	0	1
Svr Tstorm	267	31	1	15	15	1	0	5
Flash Flood	35	7	1	6	2	0	0	---

ARX = LaCrosse, WI DVN = Davenport, IA DMX = Des Moines, IA OAX = Omaha, NE FSD = Sioux Falls, SD

IEM Cow Report

SVR+TOR Warnings Issued: 310 Verified: 151 [48.7%]
Polygon Size Versus County Size            [24.6%]
Average Perimeter Ratio                    [33.6%]
Percentage of Warned Area Verified (15km)  [28.8%]
Average Storm Based Warning Size           [1850 sq km]
Probability of Detection(higher is better) [0.83]
False Alarm Ratio (lower is better)        [0.51]
Critical Success Index (higher is better)  [0.44]