IEM Daily Bulletin for Mar 16 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 16 March 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Mar 15 11:01 AM	iem-database,main	💚 Try to fix precommit	Link
Mar 15 11:05 AM	iem-database,main	📝 Set exclude	Link

Daily Feature

No feature posted

NWS Watch/Warning Summary for 12 AM 15 Mar 2026 - 12 AM 16 Mar 2026 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	75	0	0	0	0	0	0	8
Svr Tstorm	289	2	0	2	0	0	0	3
Flash Flood	2	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: 345 Verified: 153 [44.3%]
Polygon Size Versus County Size            [39.2%]
Average Perimeter Ratio                    [35.1%]
Percentage of Warned Area Verified (15km)  [18.2%]
Average Storm Based Warning Size           [2312 sq km]
Probability of Detection(higher is better) [0.88]
False Alarm Ratio (lower is better)        [0.56]
Critical Success Index (higher is better)  [0.42]

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): 2,876
• Mastodon / Fediverse: 98
• Slack: 77
• Twitter/X: 27,583
• HTTP Webhooks: 185
• Weather.IM Jabber Chatrooms: 28,103