Alert archive / Missouri / Special Weather Statements in 2016

Special Weather Statement, NWS St. Louis, MO

May 30, 2016City of Saint Louis, Missouri

NWS St. Louis, MO issued this special weather statement at May 30, 2016, 4:57 PM CDT for City of Saint Louis, Missouri. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 30, 2016, 4:57 PM CDT (21:57 UTC)
Expired: May 30, 2016, 5:30 PM CDT
In force: 33 min
Issued by: NWS St. Louis, MO

County City of Saint Louis, MO

The radar

The St Louis radar (KLSX), 39 km from the middle of the area, began a volume at 21:58 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

Springfield, MO (KSGF), launched 12:00Z, 10.0 hours before the alert went out and 360 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: 434 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 1375 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at May 30, 2:45 PM CDT, 2 hours 12 minutes earlier.

Area forecast discussion, May 30, 2:45 PM CDT, 2 hours 12 minutes before

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Hazardous weather outlook, May 30, 3:24 PM CDT, 1 hour 33 minutes before

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In the hours before

Special weather statement, May 30, 4:04 PM CDT, 53 minutes before

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Special weather statement, May 30, 4:45 PM CDT, 12 minutes before

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Local storm report, May 30, 4:46 PM CDT, 11 minutes before

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Special weather statement, May 30, 4:46 PM CDT, 11 minutes before

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Special weather statement, May 30, 4:57 PM CDT, 0 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
May 29, 8:30 PM CDT	Special Weather Statement	LSX	Shelby	45 min
May 29, 8:53 PM CDT	Special Weather Statement	LSX	Lewis	52 min
May 30, 4:46 PM CDT	Special Weather Statement	LSX	Saint Charles	29 min
May 30, 5:56 PM CDT	Special Weather Statement	LSX	Saint Charles	34 min
May 30, 4:04 PM CDT	Special Weather Statement	LSX	Montgomery	26 min
May 30, 4:45 PM CDT	Special Weather Statement	LSX	Macoupin	45 min
May 30, 6:12 PM CDT	Special Weather Statement	LSX	Greene	33 min
May 30, 6:14 PM CDT	Special Weather Statement	LSX	Montgomery	31 min

Nearby

Special Weather Statements in Missouri, 2016 Every special weather statement in 2016

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.