Alert archive / Missouri / Heat Advisories in 2019
Heat Advisory 6, NWS St. Louis, MO
NWS St. Louis, MO issued this heat advisory at Sep 10, 2019, 3:12 AM CDT for 4 counties in Missouri; Madison County, Monroe County, Saint Clair County, Illinois. It took effect at Sep 10, 2019, 12:00 PM CDT. It was in force for 55 hr.
The area
The counties it named.
The facts
- Issued
- Sep 10, 2019, 3:12 AM CDT (08:12 UTC)
- In effect from
- Sep 10, 2019, 12:00 PM CDT
- Expired
- Sep 12, 2019, 7:00 PM CDT
- In force
- 55 hr
- Issued by
- NWS St. Louis, MO
Counties Madison County, IL, Monroe County, IL, Saint Clair County, IL, City of Saint Louis, MO, Jefferson County, MO, Saint Charles County, MO, Saint Louis County, MO
The radar
The St Louis radar (KLSX), 40 km from the middle of the area, began a volume at 08:13 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 00:00Z, 8.2 hours before the alert went out and 341 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.
- Mixed-layer CAPE
- 1804 J/kg
- Mixed-layer CIN
- -84 J/kg
- Mixed-layer LCL
- 999 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 278 m²/s²
- 0-3 km storm-relative helicity
- 362 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 9.6
Nearby
Heat Advisories in Missouri, 2019Heat Advisories in Illinois, 2019Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.