Alert archive / Missouri / Special Weather Statements in 2017

Special Weather Statement, NWS St. Louis, MO

August 16, 2017Saint Charles County, Saint Louis County, City of Saint Louis, Missouri

NWS St. Louis, MO issued this special weather statement at Aug 16, 2017, 4:28 PM CDT for Saint Charles County, Saint Louis County, City of Saint Louis, Missouri. It was in force for 47 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: Aug 16, 2017, 4:28 PM CDT (21:28 UTC)
Expired: Aug 16, 2017, 5:15 PM CDT
In force: 47 min
Issued by: NWS St. Louis, MO

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

The radar

The St Louis radar (KLSX), 22 km from the middle of the area, began a volume at 21:31 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, 9.5 hours before the alert went out and 229 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: 487 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 877 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 38 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 Aug 16, 3:32 PM CDT, 56 minutes earlier.

Area forecast discussion, Aug 16, 3:32 PM CDT, 56 minutes before

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Hazardous weather outlook, Aug 16, 3:38 PM CDT, 50 minutes before

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In the hours before

Local storm report, Aug 16, 3:15 PM CDT, 1 hour 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
315 PM CDT WED AUG 16 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0314 PM     TSTM WND GST     3 W CHESTERFIELD        38.66N  90.63W
08/16/2017  M46 MPH          ST. LOUIS          MO   ASOS

&&

EVENT NUMBER LSX1700584

ELMORE

Special weather statement, Aug 16, 3:15 PM CDT, 1 hour 13 minutes before

Special Weather Statement
National Weather Service St Louis MO
315 PM CDT WED AUG 16 2017

MOZ061-063-162100-
St. Louis MO-St. Charles MO-
315 PM CDT WED AUG 16 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL ST. CHARLES AND NORTHERN
ST. LOUIS COUNTIES UNTIL 400 PM CDT...

At 315 PM CDT, Doppler radar was tracking a strong thunderstorm over
Chesterfield, moving northeast at 30 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations impacted include...
O'Fallon, St. Charles, St. Peters, Florissant, Chesterfield,
Wildwood, University City, Ballwin, Alton, Maryland Heights,
Hazelwood, Ferguson, Manchester, Creve Coeur, Overland, Jennings, St.
Ann, Bridgeton, Dardenne Prairie and Bellefontaine Neighbors.

This includes Interstate 70 in Missouri between exits 224 and 231.

This also includes  Confluence State Park and First Missouri State
Capitol Historic Site.

LAT...LON 3881 9012 3877 9017 3877 9018 3873 9022
      3872 9025 3870 9027 3856 9058 3871 9079
      3894 9035 3892 9031 3892 9025 3885 9012
TIME...MOT...LOC 2015Z 238DEG 25KT 3869 9058

Tilly

Local storm report, Aug 16, 3:33 PM CDT, 55 minutes before

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Special weather statement, Aug 16, 3:36 PM CDT, 52 minutes before

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Special weather statement, Aug 16, 4:02 PM CDT, 26 minutes before

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Special weather statement, Aug 16, 4:28 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
Aug 16, 1:16 PM CDT	Special Weather Statement	LSX	Boone, Cole, Moniteau	59 min
Aug 16, 1:54 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Cole, Moniteau	51 min
Aug 16, 2:17 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Cole, Osage	43 min
Aug 16, 2:59 PM CDT	Special Weather Statement	LSX	Callaway, Montgomery, Osage	46 min
Aug 16, 3:06 PM CDT	Special Weather Statement	LSX	City of Saint Louis	39 min
Aug 16, 3:15 PM CDT	Special Weather Statement	LSX	Saint Louis	45 min
Aug 16, 3:36 PM CDT	Special Weather Statement	LSX	Gasconade, Warren	39 min
Aug 16, 4:02 PM CDT	Special Weather Statement	LSX	Jersey	43 min

Nearby

Special Weather Statements in Missouri, 2017 Every special weather statement in 2017

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.