Iowa Environmental Mesonet Daily Bulletin for 21 May 2024

News

No news is good news

IEM Code Pushes <to branch> on Github



Daily Feature

Avoided May Cold
Date: 20 May 05:30 AM
Votes: Good: 11   Bad: 0 Abstain: 0

The featured chart looks into spring season periods with four inch depth soil temperatures around 50 degrees. For each year on record for the Ames Ag Farm Ag Climate / Soil Moisture site, the first period lasting at least 48 hours with the soil temperature above 50°F is colored red, then any subsequent periods below 50°F are colored light blue. If those periods last more than 24 hours, they are colored dark blue. For this year, there was only a brief period toward the end of April with such chilly soil temperatures. The entire month of May has seen temperatures above 50°F at a four inch depth.

The featured media can be generated on-demand here

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NWS Watch/Warning Summary for 12 AM 20 May 2024 - 12 AM 21 May 2024 CDT

Summary By WFO Watches
Type USIA ARXDVNDMXOAXFSD US
Tornado 13 1 1 0 0 1 0 2
Svr Tstorm 140 36 3 5 9 15 19 6
Flash Flood 8 3 0 0 1 2 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: 137 Verified:  59 [43.1%]
Polygon Size Versus County Size            [26.1%]
Average Perimeter Ratio                    [31.9%]
Percentage of Warned Area Verified (15km)  [19.2%]
Average Storm Based Warning Size           [1253 sq km]
Probability of Detection(higher is better) [0.68]
False Alarm Ratio (lower is better)        [0.57]
Critical Success Index (higher is better)  [0.36]