Alert archive / Illinois / Special Weather Statements in 2017

Special Weather Statement, NWS St. Louis, MO

June 16, 2017Greene County, Illinois

NWS St. Louis, MO issued this special weather statement at Jun 16, 2017, 6:43 AM CDT for Greene County, Illinois. 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: Jun 16, 2017, 6:43 AM CDT (11:43 UTC)
Expired: Jun 16, 2017, 7:30 AM CDT
In force: 47 min
Issued by: NWS St. Louis, MO

County Greene County, IL

The radar

The St Louis radar (KLSX), 98 km from the middle of the area, began a volume at 11:43 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 00:00Z, 11.7 hours before the alert went out and 249 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: 673 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 2450 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 99 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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 16, 3:55 AM CDT, 2 hours 48 minutes earlier.

Area forecast discussion, Jun 16, 3:55 AM CDT, 2 hours 48 minutes before

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Hazardous weather outlook, Jun 16, 4:11 AM CDT, 2 hours 32 minutes before

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In the hours before

Special weather statement, Jun 16, 2:01 AM CDT, 4 hours 42 minutes before

Special Weather Statement
National Weather Service St Louis MO
201 AM CDT FRI JUN 16 2017

MOZ026-027-034-035-041-042-160745-
Marion MO-Audrain MO-Monroe MO-Ralls MO-Boone MO-Shelby MO-
201 AM CDT FRI JUN 16 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN RALLS...NORTHEASTERN
BOONE...WESTERN AUDRAIN...SOUTHWESTERN MARION...SOUTHEASTERN SHELBY
AND MONROE COUNTIES UNTIL 245 AM CDT...

At 200 AM CDT, Doppler radar was tracking a strong thunderstorm over
Clark, moving northeast at 30 mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Centralia, Monroe City, Shelbina, Paris, Santa Fe, Sturgeon, Perry,
Madison, Spaulding, Granville, Hunnewell, Holliday, Stoutsville, The
Landing, Florida, Indian Creek and Thompson.

This also includes  Union Covered Bridge Historic Site and Mark Twain
Lake Recreational Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3925 9231 3943 9231 3980 9198 3960 9145
      3909 9211 3925 9239
TIME...MOT...LOC 0700Z 220DEG 27KT 3928 9231

GKS

Special weather statement, Jun 16, 2:25 AM CDT, 4 hours 18 minutes before

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Local storm report, Jun 16, 4:42 AM CDT, 2 hours 1 minute before

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Special weather statement, Jun 16, 4:48 AM CDT, 1 hour 55 minutes before

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Local storm report, Jun 16, 4:53 AM CDT, 1 hour 50 minutes before

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Special weather statement, Jun 16, 6:43 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
Jun 16, 12:45 AM CDT	Special Weather Statement	LSX	Knox, Monroe, Shelby	45 min
Jun 16, 1:06 AM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis, Marion, Shelby	39 min
Jun 16, 1:36 AM CDT	Special Weather Statement	LSX	Lewis, Marion	39 min
Jun 16, 2:01 AM CDT	Special Weather Statement	LSX	Monroe, Ralls	44 min
Jun 16, 4:36 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	22 min
Jun 16, 2:25 AM CDT	Special Weather Statement	LSX	Brown, Pike	50 min
Jun 16, 4:48 AM CDT	Special Weather Statement	LSX	Pike	42 min
Jun 16, 7:37 AM CDT	Special Weather Statement	LSX	Greene, Macoupin, Montgomery	38 min
Jun 16, 8:15 AM CDT	Special Weather Statement	LSX	Macoupin	45 min
Jun 16, 4:21 PM CDT	Special Weather Statement	LSX	Fayette	39 min
Jun 16, 4:26 PM CDT	Severe Thunderstorm Warning	LSX	Madison	31 min

Nearby

Special Weather Statements in Illinois, 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.