Alert archive / Missouri / Special Weather Statements in 2018

Special Weather Statement, NWS St. Louis, MO

August 10, 2018Washington County, Missouri

NWS St. Louis, MO issued this special weather statement at Aug 10, 2018, 6:52 PM CDT for Washington County, Missouri. It was in force for 38 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 10, 2018, 6:52 PM CDT (23:52 UTC)
Expired: Aug 10, 2018, 7:30 PM CDT
In force: 38 min
Issued by: NWS St. Louis, MO

County Washington County, MO

The radar

The St Louis radar (KLSX), 77 km from the middle of the area, began a volume at 23:55 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, 11.9 hours before the alert went out and 277 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: 836 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1267 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 88 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 10, 6:40 PM CDT, 12 minutes earlier.

Area forecast discussion, Aug 10, 6:40 PM CDT, 12 minutes before

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Hazardous weather outlook, Aug 10, 4:09 PM CDT, 2 hours 43 minutes before

Hazardous Weather Outlook
National Weather Service Saint Louis MO
409 PM CDT Fri Aug 10 2018

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-111200-
Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL-
Marion IL-Washington IL-Randolph IL-Adams IL-Brown IL-Pike IL-
Calhoun IL-Jersey IL-Madison IL-Saint Clair IL-Monroe IL-Knox MO-
Lewis MO-Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO-
Audrain MO-Moniteau MO-Cole MO-Osage MO-Callaway MO-Montgomery MO-
Lincoln MO-Gasconade MO-Warren MO-Saint Charles MO-Franklin MO-
Saint Louis MO-Saint Louis City MO-Jefferson MO-Crawford MO-
Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO-
Madison MO-Reynolds MO-
409 PM CDT Fri Aug 10 2018

This hazardous weather outlook is for portions of eastern and
central Missouri as well as west central and southwest Illinois.

.DAY ONE...Tonight

Scattered thunderstorms are expected this evening, with the
highest chances until 8 pm near the Interstate 70 corridor.
Widespread severe weather is not anticipated, but isolated strong
storms will be possible, capable of locally heavy rainfall and
gusty winds to 45 mph.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

There is a slight chance for thunderstorms over southeast
Missouri Saturday afternoon. The chance for thunderstorms will
return over portions of the area each day from Monday through
Thursday, with the highest chances on Tuesday and Wednesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated tonight.

TES

In the hours before

Local storm report, Aug 10, 4:09 PM CDT, 2 hours 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
409 PM CDT FRI AUG 10 2018

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

0405 PM     HAIL             1 NNW WOODSON TERRACE   38.74N 90.37W
08/10/2018  E1.75 INCH       ST. LOUIS          MO   LAW ENFORCEMENT

            REPORT FROM MEDIA OF LAW ENFORCEMENT
            REPORTED GOLF BALL SIZE HAIL NEAR LAMBERT
            AIRPORT NEAR INTERSTATE 70.

&&

AE

Local storm report, Aug 10, 4:15 PM CDT, 2 hours 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
415 PM CDT FRI AUG 10 2018

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

0410 PM     HAIL             1 N WOODSON TERRACE     38.75N 90.36W
08/10/2018  E0.75 INCH       ST. LOUIS          MO   PUBLIC

            REPORT VIA SOCIAL MEDIA OF DIME SIZE HAIL AT
            LAMBERT AIRPORT.

&&

AE

Local storm report, Aug 10, 4:46 PM CDT, 2 hours 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
446 PM CDT FRI AUG 10 2018

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

0444 PM     FLASH FLOOD      1 NNW WOODSON TERRACE   38.74N 90.37W
08/10/2018                   ST. LOUIS          MO   PUBLIC

            MULTIPLE REPORTS OF I-70 CLOSED NEAR LAMBERT
            AIRPORT DUE TO WATER OVER THE ROADWAY.

&&

AE

Special weather statement, Aug 10, 5:12 PM CDT, 1 hour 40 minutes before

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Special weather statement, Aug 10, 5:56 PM CDT, 56 minutes before

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Special weather statement, Aug 10, 6:52 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 10, 3:48 PM CDT	Special Weather Statement	LSX	Saint Louis, City of Saint Louis	42 min
Aug 10, 4:02 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	43 min
Aug 10, 4:11 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Gasconade, Montgomery, Osage	49 min
Aug 10, 4:40 PM CDT	Areal Flood Advisory	LSX	Saint Charles, Saint Louis, City of Saint Louis	2 hr
Aug 10, 4:48 PM CDT	Flash Flood Warning	LSX	Saint Louis, City of Saint Louis	2 hr
Aug 10, 4:56 PM CDT	Areal Flood Advisory	LSX	Callaway, Montgomery, Warren	2 hr
Aug 10, 4:59 PM CDT	Severe Thunderstorm Warning	LSX	Montgomery, Warren	46 min
Aug 10, 5:12 PM CDT	Special Weather Statement	LSX	Saint Louis	48 min
Aug 10, 5:56 PM CDT	Special Weather Statement	LSX	Jefferson	49 min

Nearby

Special Weather Statements in Missouri, 2018 Every special weather statement in 2018

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.