IEM Daily Bulletin for Jul 20 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 20 July 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

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Daily Feature

No feature posted

NWS Watch/Warning Summary for 12 AM 19 Jul 2026 - 12 AM 20 Jul 2026 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	71	0	0	0	0	0	2	2
Flash Flood	45	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:  71 Verified:  26 [36.6%]
Polygon Size Versus County Size            [15.4%]
Average Perimeter Ratio                    [27.7%]
Percentage of Warned Area Verified (15km)  [18.9%]
Average Storm Based Warning Size           [1161 sq km]
Probability of Detection(higher is better) [0.67]
False Alarm Ratio (lower is better)        [0.63]
Critical Success Index (higher is better)  [0.31]

IEMBot Social Media Posts

IEMBot can be configured to post messages to a number of social media services. More details: IEMBot Homepage.

Posts yesterday per supported service:

• ATMosphere (bluesky only attm): 2,516
• Mastodon / Fediverse: 17
• Slack: 2,127
• Twitter/X: 11,466
• HTTP Webhooks: 233
• Weather.IM Jabber Chatrooms: 14,298