IEM Daily Bulletin for Sep 26 2023

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 26 September 2023

News

No news is good news

IEM Code Pushes <to branch> on Github

• Sep 25 7:06 AM <main> sundry fixes
• Sep 25 7:13 AM <main> Merge pull request #536 from akrherz/230922
  sundry fixes

Daily Feature

Wettest Day in September
Date: 25 Sep 05:30 AM
Votes: Good: 10   Bad: 0 Abstain: 0

With 1.30" reported on Friday, Waterloo had its wettest day of the year so far. The featured chart presents some metrics on the wettest day of the year for Waterloo. The left panels show the amount on the wettest day and a simple histogram for the events by the day of the year. The right panels plot the max precipitation by year and a cumulative distribution function for the values. Having just a 1.30" total as the maximum yearly value is rather low compared to the period of record data. Having the event during September is not all that exceptional and there have been years with the data occurring during later months of the year.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 25 Sep 2023 - 12 AM 26 Sep 2023 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	0	0	0	0	0	0	0	0
Svr Tstorm	38	0	0	0	0	0	0	0
Flash Flood	6	0	0	0	0	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:  38 Verified:   6 [15.8%]
Polygon Size Versus County Size            [22.7%]
Average Perimeter Ratio                    [31.0%]
Percentage of Warned Area Verified (15km)  [7.0%]
Average Storm Based Warning Size           [1204 sq km]
Probability of Detection(higher is better) [0.50]
False Alarm Ratio (lower is better)        [0.84]
Critical Success Index (higher is better)  [0.14]