Alert archive / Missouri / Heat Advisories in 2010

Heat Advisory 7, NWS St. Louis, MO

July 21, 201029 counties in Missouri; 17 counties in Illinois

NWS St. Louis, MO issued this heat advisory at Jul 21, 2010, 3:39 PM CDT for 29 counties in Missouri; 17 counties in Illinois. It took effect at Jul 22, 2010, 12:00 PM CDT. It was in force for 56 hr.

The area

The counties it named.

The facts

Issued: Jul 21, 2010, 3:39 PM CDT (20:39 UTC)
In effect from: Jul 22, 2010, 12:00 PM CDT
Expired: Jul 24, 2010, 8:00 PM CDT
In force: 56 hr
Issued by: NWS St. Louis, MO

All 46 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, Iron County, MO, Jefferson County, MO, Knox County, MO, Lewis 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), 18 km from the middle of the area, began a volume at 20:42 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.7 hours before the alert went out and 241 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: 1868 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 559 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.7

Open this sounding in Storm Lab

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 Jul 21, 12:34 PM CDT, 3 hours 5 minutes earlier.

Area forecast discussion, Jul 21, 12:34 PM CDT, 3 hours 5 minutes before

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Hazardous weather outlook, Jul 21, 11:07 AM CDT, 4 hours 32 minutes before

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In the hours before

Special weather statement, Jul 21, 3:02 PM CDT, 37 minutes before

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Special weather statement, Jul 21, 3:26 PM CDT, 13 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 20, 7:35 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Cole, Moniteau	40 min
Jul 20, 9:39 PM CDT	River Flood Warning	LSX	Callaway, Cole	72 hr
Jul 20, 9:39 PM CDT	River Flood Warning	LSX	Callaway, Osage	8 days
Jul 20, 9:39 PM CDT	River Flood Warning	LSX	Gasconade, Montgomery	8 days
Jul 20, 9:39 PM CDT	River Flood Warning	LSX	Gasconade, Montgomery	7 days
Jul 20, 10:28 PM CDT	Flash Flood Warning	LSX	Knox, Lewis, Marion, Monroe, Ralls, Shelby	5 hr
Jul 21, 3:14 AM CDT	Areal Flood Warning	LSX	Knox, Lewis, Marion, Monroe, Ralls, Shelby	9 hr
Jul 21, 11:55 AM CDT	Areal Flood Warning	LSX	Knox, Lewis, Marion, Monroe, Ralls, Shelby	7 hr
Jul 21, 5:58 PM CDT	Areal Flood Advisory	LSX	Saint Louis, City of Saint Louis	3 hr
Jul 21, 6:23 PM CDT	Flash Flood Warning	LSX	Saint Louis, City of Saint Louis	4 hr

Nearby

Heat Advisories in Missouri, 2010 Heat Advisories in Illinois, 2010 Every heat advisory 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.