Alert archive / Missouri / Heat Advisories in 2007
Heat Advisory 1, NWS St. Louis, MO
NWS St. Louis, MO issued this heat advisory at Aug 20, 2007, 3:54 PM CDT for City of Saint Louis, Missouri. It took effect at Aug 21, 2007, 12:00 PM CDT. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Aug 20, 2007, 3:54 PM CDT (20:54 UTC)
- In effect from
- Aug 21, 2007, 12:00 PM CDT
- Expired
- Aug 21, 2007, 3:46 PM CDT
- In force
- 4 hr
- Issued by
- NWS St. Louis, MO
County City of Saint Louis, MO
The radar
The St Louis radar (KLSX), 43 km from the middle of the area, began a volume at 20:54 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
Springfield, MO (KSGF), launched 12:00Z, 8.9 hours before the alert went out and 370 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
- 671 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 560 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 225 m²/s²
- 0-3 km storm-relative helicity
- 254 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 8.4
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 20, 3:29 PM CDT, 25 minutes earlier.
Area forecast discussion, Aug 20, 3:29 PM CDT, 25 minutes before
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</html>Hazardous weather outlook, Aug 20, 6:11 AM CDT, 9 hours 43 minutes before
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</html>Nearby
Heat Advisories in Missouri, 2007Every heat advisory in 2007
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.