IEM Daily Bulletin for Apr 2 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 02 April 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
No code commits found in previous 24 Hours

Daily Feature

Monday Evening Hail Reports
Date: 01 Apr 05:30 AM
Votes: Good: 10   Bad: 0 Abstain: 0

The warm temperatures on Monday gave way to late afternoon and early evening thunderstorms that brought hail to the Des Moines Metro and other places over Iowa. The featured map presents a summary of Local Storm Reports (LSR)s issued by NWS Des Moines for hail Monday evening. The largest hail report listed was 1.25" over Waukee (west Des Moines suburb). The autoplot tool that generates these maps is a downstream infographic associated with the raw NWS LSR Text (scroll to the bottom). The IEM has a number of ways to view and download LSR data, including the LSR App and data download. For a pro-tip, if you know the three character NWS office identifier, you can enter the combination of LSR and that identifier into the upper right search box and be taken to the most rece ntly issued LSR from that office along with the map graphic like is featured today.

The featured media can be generated on-demand here

.

NWS Watch/Warning Summary for 12 AM 1 Apr 2026 - 12 AM 2 Apr 2026 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	3	0	0	0	0	0	0	2
Svr Tstorm	153	0	0	0	0	0	0	2
Flash Flood	9	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: 150 Verified:  46 [30.7%]
Polygon Size Versus County Size            [28.6%]
Average Perimeter Ratio                    [23.8%]
Percentage of Warned Area Verified (15km)  [11.1%]
Average Storm Based Warning Size           [1636 sq km]
Probability of Detection(higher is better) [0.75]
False Alarm Ratio (lower is better)        [0.69]
Critical Success Index (higher is better)  [0.28]

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): 2,093
• Mastodon / Fediverse: 21
• Slack: 29
• Twitter/X: 18,207
• HTTP Webhooks: 79
• Weather.IM Jabber Chatrooms: 14,352