IEM Daily Bulletin for Jul 10 2024
daryl herzmann
Iowa Environmental Mesonet Daily Bulletin for 10 July 2024
News
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- Jul 9 9:12 AM <main> mnt: improve spc outlook search and services
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mnt: improve spc outlook search and services
Daily Feature
Beryl Tornado Warnings
Date: 09 Jul 05:30 AM
Votes: Good: 14
Bad: 1 Abstain: 0
While over the ocean, Hurricane Beryl was a historic tropical system for a number of reasons including reaching category 5 status so early in the season, its longevity, the region it developed in, and regaining Hurricane status after a significant incursion of dry air and hostile shear environment. So it makes sense that it continued to make history after landfall on Texas early Monday morning. The storm did significant damage along the gulf coast from the traditional threats of rainfall, storm surge, and wind. It then transitioned into a prodigious tornado producer as the right front quadrant of the storm was in an abnormally primed environment to produce tornadoes. The NWS followed suit and issued a large number of tornado warnings for the date. It is difficult to state how anomalous this event was given that it happened during the first half of July. The featured chart presents an IEM accounting of the largest number of tornado warnings issued by the NWS for a July date. NWS Shreveport issued 67 warnings itself yesterday, which matches the previous NWS-wide max total for a US Central calendar day in July! Yesterday also made for the 6th day this year with over 100 tornado warnings, which places 2024 in second place for such a metric behind nine days during 2011.
The featured media can be generated on-demand here
.NWS Watch/Warning Summary for 12 AM 9 Jul 2024 - 12 AM 10 Jul 2024 CDT
| Summary | By WFO | Watches | ||||||
|---|---|---|---|---|---|---|---|---|
| Type | US | IA | ARX | DVN | DMX | OAX | FSD | US |
| Tornado | 36 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Svr Tstorm | 65 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 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: 101 Verified: 12 [11.9%] Polygon Size Versus County Size [9.5%] Average Perimeter Ratio [16.9%] Percentage of Warned Area Verified (15km) [10.8%] Average Storm Based Warning Size [655 sq km] Probability of Detection(higher is better) [0.54] False Alarm Ratio (lower is better) [0.88] Critical Success Index (higher is better) [0.11]