IEM Daily Bulletin for Jul 10 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 10 July 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Jul 9 9:58 AM	iem,main	✨ Add percentiles to monthly totals distribution https://mesonet.agron.iastate.edu/plotting/auto/?q=6	Link
Jul 9 10:06 AM	iem,main	💚 Address codereview	Link
Jul 9 9:38 AM	pywwa,main	⬆️ Update precommit pyproject-fmt	Link
Jul 9 9:41 AM	pywwa,main	📝 Demote unknown nexrad station to log	Link
Jul 9 9:42 AM	pywwa,main	📝 Add DJT to station tables	Link
Jul 9 9:49 AM	pywwa,main	💚 Address codereview	Link

Daily Feature

2026 Daily Departures
Date: 09 Jul 05:00 AM
Votes: Good: 10   Bad: 1 Abstain: 1

The featured chart presents the daily high and low temperature climatology, 2026 observations, and the departure between the two for Ames. The chart nicely shows the cooler than average weather that dominated the last half of June has been replaced by warmer weather to start off July. The bottom panel, which plots difference between observations and the climatology average, is interesting as while highs and lows generally directionally match, the magnitudes are different with high temperature departures typically having larger absolute values than lows.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 9 Jul 2026 - 12 AM 10 Jul 2026 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	8	0	0	0	0	0	0	0
Svr Tstorm	201	0	0	0	0	0	0	5
Flash Flood	38	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: 204 Verified:  82 [40.2%]
Polygon Size Versus County Size            [27.9%]
Average Perimeter Ratio                    [29.1%]
Percentage of Warned Area Verified (15km)  [16.9%]
Average Storm Based Warning Size           [1648 sq km]
Probability of Detection(higher is better) [0.69]
False Alarm Ratio (lower is better)        [0.60]
Critical Success Index (higher is better)  [0.34]

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