IEM Daily Bulletin for Mar 8 2026

[daryl herzmann]

Iowa Environmental Mesonet Daily Bulletin for 08 March 2026

News

No news is good news

IEM Code Pushes <repo,branch> on Github

Timestamp	Repository	Message	Link
No code commits found in previous 24 Hours

Daily Feature

Humid for early March
Date: 07 Mar 07:03 AM
Votes: Good: 9   Bad: 0 Abstain: 0

The increase in humidity on Friday was remarkable with practically the entire state reaching a dew point temperature of at least 50°F and a considerable portion of the state reaching at least 60°F by late afternoon and into the evening. All of this moisture helped to fuel abundant showers and thunderstorms which brought much needed rainfall to the state. The dew point readings on Friday were at the extreme end of what is possible for this time of year. The featured chart presents the maximum reported dew point by hour for Des Moines over the inclusive 1 January through 6 March period. The plot shows thirteen hours during yesterday with the reported dew point either tied or setting an unofficial hourly record. The reported 61°F dew point at 9 PM also appears to be the overall maximum for any hour during this selected period of days.

The featured media can be generated on-demand here

.

NWS Watch/Warning Summary for 12 AM 7 Mar 2026 - 12 AM 8 Mar 2026 CST

	Summary		By WFO					Watches
Type	US	IA	ARX	DVN	DMX	OAX	FSD	US
Tornado	18	0	0	0	0	0	0	2
Svr Tstorm	107	0	0	0	0	0	0	4
Flash Flood	19	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: 124 Verified:  43 [34.7%]
Polygon Size Versus County Size            [25.6%]
Average Perimeter Ratio                    [23.2%]
Percentage of Warned Area Verified (15km)  [19.2%]
Average Storm Based Warning Size           [1387 sq km]
Probability of Detection(higher is better) [0.66]
False Alarm Ratio (lower is better)        [0.65]
Critical Success Index (higher is better)  [0.29]

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): 2,317
• Mastodon / Fediverse: 27
• Slack: 1,836
• Twitter/X: 23,949
• HTTP Webhooks: 90
• Weather.IM Jabber Chatrooms: 15,904