Alert archive / Missouri / Heat Advisories in 2019

Heat Advisory 4, NWS St. Louis, MO

August 11, 201927 counties in Missouri; 11 counties in Illinois

NWS St. Louis, MO issued this heat advisory at Aug 11, 2019, 3:43 AM CDT for 27 counties in Missouri; 11 counties in Illinois. It took effect at Aug 12, 2019, 12:00 PM CDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Aug 11, 2019, 3:43 AM CDT (08:43 UTC)
In effect from: Aug 12, 2019, 12:00 PM CDT
Expired: Aug 12, 2019, 9:00 PM CDT
In force: 9 hr
Issued by: NWS St. Louis, MO

All 38 counties

Calhoun County, IL, Clinton County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Monroe County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shelby County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 21 km from the middle of the area, began a volume at 08:42 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What forecasters said that day

The local office's own words before this heat advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before this heat advisory went out at Aug 11, 3:20 AM CDT, 23 minutes earlier.

Area forecast discussion, Aug 11, 3:20 AM CDT, 23 minutes before

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Hazardous weather outlook, Aug 10, 4:26 PM CDT, 11 hours 17 minutes before

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The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 11, 10:45 AM CDT	Areal Flood Advisory	LSX	Boone, Callaway, Cole, Osage	15 min
Aug 11, 10:55 AM CDT	Flash Flood Warning	LSX	Boone, Callaway, Cole, Moniteau, Osage	6 hr

Nearby

Heat Advisories in Missouri, 2019 Heat Advisories in Illinois, 2019 Every heat advisory in 2019

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.