Alert archive / Missouri / Excessive Heat Warnings in 2010
Excessive Heat Warning 2, NWS St. Louis, MO
NWS St. Louis, MO issued this excessive heat warning at Jul 23, 2010, 3:57 AM CDT for 4 counties in Missouri; Madison County, Monroe County, Saint Clair County, Illinois. It was in force for 40 hr. 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 23, 2010, 3:57 AM CDT (08:57 UTC)
- Expired
- Jul 24, 2010, 8:00 PM CDT
- In force
- 40 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 08:58 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, 9.0 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
- 2664 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 1076 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 125 m²/s²
- 0-3 km storm-relative helicity
- 267 m²/s²
- Significant tornado parameter
- 1.5
- Supercell composite
- 9.9
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 23, 3:14 AM CDT, 43 minutes earlier.
Area forecast discussion, Jul 23, 3:14 AM CDT, 43 minutes before
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</html>Hazardous weather outlook, Jul 22, 10:58 PM CDT, 4 hours 59 minutes before
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</html>Nearby
Excessive Heat Warnings in Missouri, 2010Excessive Heat Warnings in Illinois, 2010Every excessive heat warning in 2010
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.