Alert archive / Missouri / Special Weather Statements in 2018

Special Weather Statement, NWS St. Louis, MO

June 20, 2018Marion County, Ralls County, Missouri

NWS St. Louis, MO issued this special weather statement at Jun 20, 2018, 5:09 PM CDT for Marion County, Ralls County, Missouri. It was in force for 66 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: Jun 20, 2018, 5:09 PM CDT (22:09 UTC)
Expired: Jun 20, 2018, 6:15 PM CDT
In force: 66 min
Issued by: NWS St. Louis, MO

Counties Marion County, MO, Ralls County, MO

The radar

The St Louis radar (KLSX), 152 km from the middle of the area, began a volume at 22:12 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

Davenport, (KDVN), launched 12:00Z, 10.2 hours before the alert went out and 220 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: 235 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 502 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Jun 20, 3:47 PM CDT, 1 hour 22 minutes earlier.

Area forecast discussion, Jun 20, 3:47 PM CDT, 1 hour 22 minutes before

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<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Hazardous weather outlook, Jun 20, 3:45 PM CDT, 1 hour 24 minutes before

Hazardous Weather Outlook
National Weather Service Saint Louis MO
345 PM CDT Wed Jun 20 2018

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-211200-
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-
345 PM CDT Wed Jun 20 2018

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

.DAY ONE...Tonight

Thunderstorms will be likely for most areas tonight. Isolated
severe storms will also be possible, mainly during the evening
hours with damaging winds the primary threat, but large hail will
also be possible.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

There is a chance for thunderstorms across at least a portion of
the area each day. Isolated severe storms will be possible
Thursday afternoon and evening, mainly across southwest Illinois.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed during the evening hours. Spotters
are encouraged to report any severe weather, if observed, to the
National Weather Service.

GKS

In the hours before

Local storm report, Jun 20, 2:32 PM CDT, 2 hours 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
232 PM CDT WED JUN 20 2018

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

0726 PM     FLOOD            MAPLEWOOD               38.62N 90.33W
06/19/2018                   ST. LOUIS          MO   BROADCAST MEDIA

            LACLEDE STATION ROAD AND ADJACENT PARKING
            LOTS FLOODED LIKELY DUE TO FLOODWATERS FROM
            HAMPTON BRANCH. TIME ESTIMATED FROM PICTURES
            AND RADAR IMAGERY.

&&

JPG

Special weather statement, Jun 20, 4:05 PM CDT, 1 hour 4 minutes before

Special Weather Statement
National Weather Service St Louis MO
405 PM CDT WED JUN 20 2018

ILZ095-MOZ019-202145-
Adams IL-Lewis MO-
405 PM CDT WED JUN 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ADAMS AND LEWIS
COUNTIES UNTIL 445 PM CDT...

At 405 PM CDT, Doppler radar was tracking a strong thunderstorm over
Lewistown, moving northeast at 15 mph.

Nickel size hail will be possible with this storm.

Locations impacted include...
Canton, La Belle, Lewistown, Ewing, Steffenville, Monticello and
Meyer.

LAT...LON 4025 9151 4023 9150 4020 9151 4020 9147
      4011 9139 3995 9180 3995 9195 4010 9195
      4025 9171
TIME...MOT...LOC 2105Z 234DEG 14KT 4006 9179

Tilly

Special weather statement, Jun 20, 5:09 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service St Louis MO
509 PM CDT WED JUN 20 2018

ILZ095-MOZ019-027-034-035-202315-
Adams IL-Marion MO-Monroe MO-Ralls MO-Lewis MO-
509 PM CDT WED JUN 20 2018

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN ADAMS...WESTERN RALLS...
MARION...EASTERN LEWIS AND EASTERN MONROE COUNTIES UNTIL 615 PM
CDT...

At 508 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near La Grange to near Paris. Movement was
northeast at 15 mph.

Dime size hail and winds in excess of 30 mph will be possible with
these storms.

Locations impacted include...
Quincy, Hannibal, Palmyra, Monroe City, Canton, Santa Fe, Warren,
Mendon, La Grange, Perry, Center, Rensselaer, Maywood, Spaulding,
Philadelphia, Ursa, Loraine, Woodville, Taylor and Lima.

This includes Interstate 172 between exits 10 and 19.

This also includes  Wakonda State Park and Mark Twain Lake
Recreational Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4020 9150 4020 9108 3936 9162 3936 9204
      3966 9186 3966 9185 3969 9185 4025 9151
TIME...MOT...LOC 2208Z 239DEG 15KT 4008 9154 3947 9192

Maples

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 7:12 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis, City of Saint Louis	48 min
Jun 20, 2:48 AM CDT	Areal Flood Advisory	LSX	Franklin, Gasconade, Montgomery, Saint Charles, Warren	7 hr
Jun 20, 4:05 PM CDT	Special Weather Statement	LSX	Lewis	40 min
Jun 20, 5:21 PM CDT	Special Weather Statement	LSX	Audrain, Callaway	54 min
Jun 20, 6:44 PM CDT	Special Weather Statement	LSX	Pike	46 min
Jun 19, 7:21 PM CDT	Special Weather Statement	LSX	Fayette	24 min
Jun 19, 8:12 PM CDT	Flash Flood Warning	LSX	Fayette	6 hr
Jun 20, 2:02 AM CDT	Areal Flood Warning	LSX	Fayette	9 hr
Jun 20, 6:16 PM CDT	Special Weather Statement	LSX	Adams, Brown, Pike	59 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.