IEM Daily Bulletin for Jul 3 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 03 July 2026

News

No news is good news

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Daily Feature

Calendar of Daily Max Heat Index
Date: 02 Jul 05:30 AM
Votes: Good: 14   Bad: 0 Abstain: 0

Wednesday was yet another very warm day this week for most of Iowa, but showers and clouds kept northcentral Iowa cooler and the rest of the state was a couple degrees cooler than previous days. For Des Moines, the maximum heat index was 98°F, based on available hourly reports. The featured calendar presents the daily maximum heat index values for Des Moines since the first of April. The calendar nicely shows that prior to this week, there was not much to speak of for high index values with only two days in the 90s earlier in June. The summer time heat looks to stick around into next week.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 2 Jul 2026 - 12 AM 3 Jul 2026 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	24	7	5	1	1	0	9	0
Svr Tstorm	293	30	6	3	17	6	27	8
Flash Flood	19	6	4	0	3	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: 305 Verified: 123 [40.3%]
Polygon Size Versus County Size            [20.8%]
Average Perimeter Ratio                    [29.4%]
Percentage of Warned Area Verified (15km)  [18.6%]
Average Storm Based Warning Size           [1281 sq km]
Probability of Detection(higher is better) [0.79]
False Alarm Ratio (lower is better)        [0.60]
Critical Success Index (higher is better)  [0.36]

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