IEM Daily Bulletin for Jul 2 2026

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daryl herzmann

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Jul 2, 2026, 8:12:10 AMJul 2
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Iowa Environmental Mesonet Daily Bulletin for 02 July 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp Repository Message Link
Jul 1 7:22 AM iem,main ✨ Add merge of XH and EH events
https://mesonet.agron.iastate.edu/plotting/auto/?q=73		 Link
Jul 1 7:23 AM iem,main ⬇️ Reduce log noise Link
Jul 1 8:00 AM iem,main 💚 Address codereview Link
Jul 1 9:15 AM pywwa,main [pre-commit.ci] auto fixes from pre-commit.com hooks
for more information, see https://pre-commit.ci		 Link


Daily Feature

32 Years of NEXRAD Mosaics
Date: 01 Jul 05:30 AM
Votes: Good: 19   Bad: 0 Abstain: 0

Last week, the daily feature denoted the 25th Anniversary of the IEM! Even though the project is only 25 years old, a number of datasets have been back filled to dates prior than 2001 based on upstream archive availability. One of those back filled datasets are NEXRAD Mosaics. The featured image is a postage stamp plot showing a snapshot of the mosaic product at 8 PM each 30 June since 1997. It is interesting to visually and quickly compare the years and how the RADAR presentation looked on each. One item to note is that the IEM archive for this product goes back to 1995, but upstream archive availability is somewhat spotty prior to 1997, so that is why 1997 was chosen as the first year for this visualization.

The featured media can be generated on-demand here

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

Summary By WFO Watches
Type USIA ARXDVNDMXOAXFSD US
Tornado 5 2 2 0 0 0 1 0
Svr Tstorm 252 11 12 0 0 1 13 10
Flash Flood 17 0 2 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: 251 Verified: 120 [47.8%]
Polygon Size Versus County Size            [31.8%]
Average Perimeter Ratio                    [32.6%]
Percentage of Warned Area Verified (15km)  [21.4%]
Average Storm Based Warning Size           [1896 sq km]
Probability of Detection(higher is better) [0.81]
False Alarm Ratio (lower is better)        [0.52]
Critical Success Index (higher is better)  [0.43]

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): 2,503
  • Mastodon / Fediverse: 15
  • Slack: 309
  • Twitter/X: 12,880
  • HTTP Webhooks: 361
  • Weather.IM Jabber Chatrooms: 18,565

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