Alert archive / Missouri / Excessive Heat Warnings in 2019

Excessive Heat Warning 1, NWS St. Louis, MO

July 16, 201926 counties in Missouri; 17 counties in Illinois

NWS St. Louis, MO issued this excessive heat warning at Jul 16, 2019, 3:32 PM CDT for 26 counties in Missouri; 17 counties in Illinois. It took effect at Jul 17, 2019, 1:00 PM CDT. It was in force for 4 days. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 16, 2019, 3:32 PM CDT (20:32 UTC)
In effect from: Jul 17, 2019, 1:00 PM CDT
Expired: Jul 21, 2019, 8:00 PM CDT
In force: 4 days
Issued by: NWS St. Louis, MO

All 43 counties

Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery 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, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls 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), 27 km from the middle of the area, began a volume at 20:34 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.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.5 hours before the alert went out and 302 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1020 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: 15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this excessive heat warning 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 excessive heat warning went out at Jul 16, 11:41 AM CDT, 3 hours 51 minutes earlier.

Area forecast discussion, Jul 16, 11:41 AM CDT, 3 hours 51 minutes before

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Hazardous weather outlook, Jul 16, 4:17 AM CDT, 11 hours 15 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
Jul 16, 3:32 PM CDT	Heat Advisory	LSX	Iron, Madison, Reynolds	5 days

Nearby

Excessive Heat Warnings in Missouri, 2019 Excessive Heat Warnings in Illinois, 2019 Every excessive heat warning 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.