Alert archive / Missouri / Special Weather Statements in 2017

Special Weather Statement, NWS St. Louis, MO

April 5, 2017City of Saint Louis, Missouri

NWS St. Louis, MO issued this special weather statement at Apr 5, 2017, 4:44 PM CDT for City of Saint Louis, Missouri. It was in force for 46 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
Apr 5, 2017, 4:44 PM CDT (21:44 UTC)
Expired
Apr 5, 2017, 5:30 PM CDT
In force
46 min
Issued by
NWS St. Louis, MO

County City of Saint Louis, MO

The radar

The St Louis radar (KLSX), 52 km from the middle of the area, began a volume at 21:47 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, 9.7 hours before the alert went out and 211 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2017-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2017-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 362 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
685 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
362 m²/s²
0-3 km storm-relative helicity
572 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 Apr 5, 3:12 PM CDT, 1 hour 32 minutes earlier.

Area forecast discussion, Apr 5, 3:12 PM CDT, 1 hour 32 minutes before
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</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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Hazardous weather outlook, Apr 5, 3:14 PM CDT, 1 hour 30 minutes before
Hazardous Weather Outlook
National Weather Service Saint Louis MO
314 PM CDT Wed Apr 5 2017

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-061200-
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-
314 PM CDT Wed Apr 5 2017

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

.DAY ONE...Tonight

Isolated severe thunderstorms are possible late this afternoon
across southwest Illinois. The primary threats will be damaging
winds and large hail.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is possible late this afternoon across
southwest Illinois.

Kanofsky

In the hours before

Special weather statement, Apr 5, 4:44 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service St Louis MO
444 PM CDT WED APR 5 2017

ILZ100-101-MOZ061-063-064-052230-
St. Clair IL-Madison IL-St. Louis MO-St. Charles MO-
St. Louis City MO-
444 PM CDT WED APR 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN MADISON AND NORTHERN ST.
CLAIR COUNTIES IN SOUTHWESTERN ILLINOIS...EAST CENTRAL ST. CHARLES
AND NORTHEASTERN ST. LOUIS COUNTIES IN EAST CENTRAL MISSOURI AND
NORTHEASTERN ST. LOUIS CITY UNTIL 530 PM CDT...

At 444 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Black Jack to Millstadt. Movement was northeast
at 25 mph.

Half inch hail and winds in excess of 45 mph will be possible with
these storms.

Locations impacted include...
St. Louis, Florissant, Belleville, Granite City, O'Fallon, Alton,
East St. Louis, Hazelwood, Collinsville, Edwardsville, Ferguson,
Godfrey, Fairview Heights, Overland, Cahokia, Jennings, Swansea, St.
Ann, Glen Carbon and Shiloh.

This includes Interstate 64 in Illinois between exits 9 and 19.

This also includes  Scott Joplin Historic Site, Confluence State
Park, and Horseshoe Lake State Park.

LAT...LON 3859 8979 3840 9013 3842 9014 3846 9018
      3864 9023 3871 9040 3900 9010 3900 9007
TIME...MOT...LOC 2144Z 225DEG 22KT 3880 9028 3848 9010

KD

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 4, 10:55 PM CDTSevere Thunderstorm WarningLSXCrawford50 min
Apr 4, 11:30 PM CDTSevere Thunderstorm WarningLSXCrawford, Franklin, Iron, Washington45 min
Apr 5, 12:20 AM CDTSevere Thunderstorm WarningLSXFranklin, Jefferson, Sainte Genevieve, Saint Francois, Saint Louis, Washington and 1 more40 min
Apr 5, 1:27 AM CDTSevere Thunderstorm WarningLSXMadison, Sainte Genevieve, Saint Francois25 min
Apr 5, 2:18 AM CDTFlash Flood WarningLSXCrawford, Iron, Washington6 hr
Apr 5, 5:26 AM CDTAreal Flood AdvisoryLSXSaint Louis4 hr
Apr 5, 8:09 AM CDTAreal Flood WarningLSXCrawford3 hr
Apr 5, 9:51 AM CDTRiver Flood WarningLSXCallaway, Osage6 days
Apr 5, 9:51 AM CDTRiver Flood WarningLSXGasconade, Montgomery6 days
Apr 5, 9:51 AM CDTRiver Flood WarningLSXGasconade, Montgomery5 days
Apr 5, 9:51 AM CDTRiver Flood WarningLSXBoone, Callaway, Cole, Moniteau4 days
Apr 5, 10:07 AM CDTRiver Flood WarningLSXLewis3 days
Apr 5, 11:24 AM CDTRiver Flood WarningLSXLewis8 days
Apr 5, 11:24 AM CDTRiver Flood WarningLSXMarion8 days
Apr 5, 11:24 AM CDTRiver Flood WarningLSXRalls5 days
Apr 5, 11:24 AM CDTRiver Flood WarningLSXPike7 days
Apr 5, 11:24 AM CDTRiver Flood WarningLSXPike9 days
Apr 5, 11:24 AM CDTRiver Flood WarningLSXLincoln7 days
Apr 5, 11:24 AM CDTRiver Flood WarningLSXSaint Charles11 days
Apr 5, 11:24 AM CDTRiver Flood WarningLSXSaint Charles7 days
Apr 5, 11:24 AM CDTRiver Flood WarningLSXPerry, Sainte Genevieve10 days
Apr 5, 1:51 PM CDTRiver Flood WarningLSXLincoln37 hr
Apr 5, 6:11 PM CDTAreal Flood AdvisoryLSXSaint Louis, City of Saint Louis3 hr
Apr 5, 2:06 AM CDTSevere Thunderstorm WarningLSXRandolph24 min
Apr 5, 4:51 AM CDTAreal Flood AdvisoryLSXGreene, Macoupin4 hr
Apr 5, 11:46 AM CDTRiver Flood WarningLSXBrown16 days
Apr 5, 11:46 AM CDTRiver Flood WarningLSXMorgan, Pike15 days
Apr 5, 11:46 AM CDTRiver Flood WarningLSXPike, Scott19 days

Nearby

Special Weather Statements in Missouri, 2017Every 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.