IEM Daily Bulletin for Jul 11 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 11 July 2026

News

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Daily Feature

Precip Metrics for Spencer
Date: 10 Jul 05:30 AM
Votes: Good: 11   Bad: 0 Abstain: 1

The weekly update to the US Drought Monitor was released Thursday morning and while most of Iowa is drought free, pockets of dryness continue to fester over northcentral and northwestern Iowa. One of the driest long term reporting locations as of late has been Spencer. The featured chart presents a number of precipitation metrics for the site. The individual graphs are best interpreted by reading them right to left as they display trailing period metrics for the plotted date up until 9 July. The right side (near term) values are a bit noisy as a recent rainfall event skews metrics over a short duration of time. The bottom left panel plot is probably the most informative as it plots standardized precipitation index (SPI) with the associated drought thresholds. Departures do not get too far out of hand until you reach back into early fall 2025.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 10 Jul 2026 - 12 AM 11 Jul 2026 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	2	1	0	0	1	0	0	0
Svr Tstorm	193	0	0	0	0	0	0	2
Flash Flood	60	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: 192 Verified: 116 [60.4%]
Polygon Size Versus County Size            [30.2%]
Average Perimeter Ratio                    [29.1%]
Percentage of Warned Area Verified (15km)  [29.9%]
Average Storm Based Warning Size           [1692 sq km]
Probability of Detection(higher is better) [0.81]
False Alarm Ratio (lower is better)        [0.40]
Critical Success Index (higher is better)  [0.53]

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