Alert archive / Missouri / Special Weather Statements in 2017

Special Weather Statement, NWS St. Louis, MO

October 10, 2017Saint Louis County, City of Saint Louis, Missouri

NWS St. Louis, MO issued this special weather statement at Oct 10, 2017, 5:27 AM CDT for Saint Louis County, City of Saint Louis, Missouri. It was in force for 48 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: Oct 10, 2017, 5:27 AM CDT (10:27 UTC)
Expired: Oct 10, 2017, 6:15 AM CDT
In force: 48 min
Issued by: NWS St. Louis, MO

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

The radar

The St Louis radar (KLSX), 14 km from the middle of the area, began a volume at 10:27 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 00:00Z, 10.5 hours before the alert went out and 234 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: 91 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1637 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 Oct 10, 4:12 AM CDT, 1 hour 15 minutes earlier.

Area forecast discussion, Oct 10, 4:12 AM CDT, 1 hour 15 minutes before

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Hazardous weather outlook, Oct 10, 4:55 AM CDT, 32 minutes before

Hazardous Weather Outlook
National Weather Service Saint Louis MO
455 AM CDT Tue Oct 10 2017

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-
455 AM CDT Tue Oct 10 2017

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

.DAY ONE...Today and Tonight

Will see several waves of thunderstorms today. Some of the
thunderstorms will be strong to severe this afternoon, mainly
across parts of east central and southeastern Missouri, as well
as, southwestern Illinois. The main threats will be large hail and
damaging winds.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon.

Byrd

In the hours before

Special weather statement, Oct 10, 2:30 AM CDT, 2 hours 57 minutes before

Special Weather Statement
National Weather Service St Louis MO
230 AM CDT TUE OCT 10 2017

ILZ060-064-065-100815-
Bond IL-Montgomery IL-Fayette IL-
230 AM CDT TUE OCT 10 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN BOND...NORTHWESTERN
FAYETTE AND SOUTHEASTERN MONTGOMERY COUNTIES UNTIL 315 AM CDT...

At 230 AM CDT, Doppler radar was tracking a strong thunderstorm over
Van Burensburg, moving northeast at 40 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Vandalia, Greenville, Hillsboro, Nokomis, Ramsey, Witt, Taylor
Springs, Coffeen, Mulberry Grove, Schram City, Woburn, Wrights
Corner, Van Burensburg, Irving, Shafter, Herrick, Panama, Fillmore,
Coalton and Donnellson.

This includes Interstate 70 in Illinois between exits 41 and 45.

This also includes  Ramsey Lake State Park.

LAT...LON 3884 8945 3909 8957 3935 8926 3935 8914
      3922 8914 3922 8884 3917 8880 3914 8881
TIME...MOT...LOC 0730Z 224DEG 35KT 3904 8933

Glass

Special weather statement, Oct 10, 5:27 AM 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
Oct 9, 7:03 PM CDT	Special Weather Statement	LSX	City of Saint Louis	42 min
Oct 9, 7:18 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	42 min
Oct 9, 7:58 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	47 min
Oct 10, 2:41 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	49 min
Oct 10, 3:25 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve	38 min
Oct 9, 8:44 PM CDT	Special Weather Statement	LSX	Macoupin	46 min
Oct 10, 2:30 AM CDT	Special Weather Statement	LSX	Bond	45 min
Oct 10, 4:02 PM CDT	Special Weather Statement	LSX	Washington	43 min
Oct 10, 4:28 PM CDT	Areal Flood Advisory	LSX	Macoupin, Madison, Montgomery, Saint Clair	4 hr

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.