IEM Daily Bulletin for Mar 23 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 23 March 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
Mar 22 10:26 AM	iem,main	✨ Add conditional to JSON response	Link
Mar 22 10:27 AM	iem,main	⬆️ Update precommit	Link

Daily Feature

All-time March Record
Date: 22 Mar 06:07 AM
Votes: Good: 11   Bad: 2 Abstain: 0

Saturday was incredibly warm for March with temperatures soaring into the 80s and even a few 90s over Iowa and beyond. For a couple of locations, like Cedar Rapids, a new March monthly maximum temperature record was set with a high temperature of 89°F. The featured chart presents the monthly maximum temperature records for Cedar Rapids along with a little cartoon showing the day of the given month that the record resides. Sometimes these records occur during the last few or first few days of the month, which makes the records seem arbitrary due to the non-consistent month boundaries with respect to the solar day. Anyway, those pedantic issues aside, IEM unofficial areal averaged data for Iowa will likely place Saturday as the second warmest on record for high temperature behind 29 March 1986.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 22 Mar 2026 - 12 AM 23 Mar 2026 CDT

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	0	0	0	0	0	0	0	0
Svr Tstorm	108	0	0	0	0	0	0	3
Flash Flood	2	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: 108 Verified:  66 [61.1%]
Polygon Size Versus County Size            [35.6%]
Average Perimeter Ratio                    [32.5%]
Percentage of Warned Area Verified (15km)  [30.5%]
Average Storm Based Warning Size           [1517 sq km]
Probability of Detection(higher is better) [0.92]
False Alarm Ratio (lower is better)        [0.39]
Critical Success Index (higher is better)  [0.58]

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