IEM Daily Bulletin for Jun 2 2026
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 02 June 2026
News
No news is good newsIEM Code Pushes <repo,branch> on Github
| Timestamp | Repository | Message | Link |
|---|---|---|---|
| Jun 1 8:36 AM | iem,main | ⬆️ Update eslint pre-commit | Link |
| Jun 1 9:06 AM | iem,main | 🐛 Address misc autoplot bugs from log review | Link |
| Jun 1 9:13 AM | iem,main | 💚 Address codereview | Link |
| Jun 1 10:00 AM | iem,main | ♻️ Refactor {n0r,n0q}2gtiff processing | Link |
| Jun 1 10:13 AM | iem,main | 💚 Address codereview | Link |
| Jun 1 10:27 AM | iem,main | 🐛 Ensure endts is in UTC timezone | Link |
| Jun 1 10:59 AM | iem,main | ⚡️ Send autoplot telemetry to dedicated socket | Link |
| Jun 1 11:17 AM | iem,main | 🎨 Codify rsyslog sidedoor, use it for error_log | Link |
| Jun 1 11:26 AM | iem,main | 💚 Address codereview | Link |
| Jun 1 11:32 AM | pyiem,main | 🚚 Use generalized iemweb rsyslog socket for msgs | Link |
| Jun 1 7:21 AM | pywwa,main | 🎨 Prevent invalid 1970 timestamp with nexradattr | Link |
| Jun 1 7:22 AM | pywwa,main | ⬆️ Update pyproject-fmt precommit | Link |
| Jun 1 7:54 AM | pywwa,main | ➕ Add CNM2 pirep | Link |
| Jun 1 12:53 PM | iem-web-services,main | 📝 Tweak docs | Link |
Daily Feature
Daily Precip Climo
Date: 01 Jun 05:30 AM
Votes: Good: 13
Bad: 0 Abstain: 0
On average, June is Iowa's wettest month. So it seems appropriate for the start of June to look into precipitation climatology. The featured chart presents the official NCEI daily climatology for Des Moines along with the previous official version. NCEI updates the climatology every ten years to represent a recent 30 year period. A climatology of precipitation is somewhat tricky as the dataset is dominated by dry days (zeros) and heavy rainfall events that skew simple daily statistics. Average daily values become somewhat meaningless, but the annual cycle is still illustrative as shown by the featured chart. It is interesting to see the July dip that shows up in the current (1991-2020) climatology, which is likely due to a number of dry Julys during the 2010s.
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 1 Jun 2026 - 12 AM 2 Jun 2026 CDT
| Summary | By WFO | Watches | ||||||
|---|---|---|---|---|---|---|---|---|
| Type | US | IA | ARX | DVN | DMX | OAX | FSD | US |
| Tornado | 12 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Svr Tstorm | 278 | 12 | 0 | 0 | 2 | 9 | 1 | 9 |
| Flash Flood | 21 | 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: 284 Verified: 129 [45.4%] Polygon Size Versus County Size [25.6%] Average Perimeter Ratio [29.7%] Percentage of Warned Area Verified (15km) [27.0%] Average Storm Based Warning Size [1597 sq km] Probability of Detection(higher is better) [0.88] False Alarm Ratio (lower is better) [0.55] 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): 2,409
- Mastodon / Fediverse: 10
- Slack: 294
- Twitter/X: 11,435
- HTTP Webhooks: 439
- Weather.IM Jabber Chatrooms: 18,114