Alert archive / Missouri / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 69, NWS St. Louis, MO

July 9, 1991Saint Louis County, City of Saint Louis, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 9, 1991, 8:34 PM CDT for Saint Louis County, City of Saint Louis, Missouri. It was in force for 41 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 9, 1991, 8:34 PM CDT (01:34 UTC)
Expired: Jul 9, 1991, 9:15 PM CDT
In force: 41 min
Issued by: NWS St. Louis, MO
Area: Whole counties

Counties City of Saint Louis, MO, Saint Louis County, MO

What was reported inside it

Time	Report	Where	Remark
Jul 9, 8:45 PM CDT	Thunderstorm Wind 0	St. Louis, MO

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Paducah/Barkley, KY (KPAH), launched 00:00Z, 1.6 hours before the alert went out and 225 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: 2067 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 959 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 9, 4:45 PM CDT, 3 hours 49 minutes before

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Special weather statement, Jul 9, 6:51 PM CDT, 1 hour 43 minutes before

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Special weather statement, Jul 9, 6:55 PM CDT, 1 hour 39 minutes before

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Special weather statement, Jul 9, 8:04 PM CDT, 30 minutes before

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Special weather statement, Jul 9, 8:16 PM CDT, 18 minutes before

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Special weather statement, Jul 9, 8:25 PM CDT, 9 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 9, 7:10 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles	35 min
Jul 10, 12:58 AM CDT	Flash Flood Warning	LSX	Warren	3 hr
Jul 10, 1:03 AM CDT	Flash Flood Warning	LSX	Lincoln, Pike	3 hr
Jul 10, 1:41 AM CDT	Flash Flood Warning	LSX	City of Saint Louis	3 hr
Jul 10, 1:41 AM CDT	Flash Flood Warning	LSX	Saint Charles	3 hr
Jul 10, 1:41 AM CDT	Flash Flood Warning	LSX	Franklin, Jefferson, Saint Louis	3 hr
Jul 10, 4:43 AM CDT	Flash Flood Warning	LSX	Franklin	3 hr
Jul 10, 5:33 AM CDT	Flash Flood Warning	LSX	Jefferson, Saint Louis	3 hr
Jul 10, 5:33 AM CDT	Flash Flood Warning	LSX	City of Saint Louis	3 hr
Jul 10, 5:33 AM CDT	Flash Flood Warning	LSX	Saint Charles	3 hr
Jul 10, 6:41 AM CDT	Flash Flood Warning	LSX	Lincoln	3 hr

Nearby

Severe Thunderstorm Warnings in Missouri, 1991 Every severe thunderstorm warning in 1991

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.