Alert archive / Illinois / Special Weather Statements in 2017

Special Weather Statement, NWS St. Louis, MO

June 16, 2017Macoupin County, Illinois

NWS St. Louis, MO issued this special weather statement at Jun 16, 2017, 8:15 AM CDT for Macoupin County, Illinois. It was in force for 45 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, 8:15 AM CDT (13:15 UTC)
Expired: Jun 16, 2017, 9:00 AM CDT
In force: 45 min
Issued by: NWS St. Louis, MO

County Macoupin County, IL

The radar

The Lincoln radar (KILX), 97 km from the middle of the area, began a volume at 13:15 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, 1.3 hours before the alert went out and 135 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: 61 J/kg
Mixed-layer CIN: -277 J/kg
Mixed-layer LCL: 1308 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -167 m²/s²
0-3 km storm-relative helicity: -56 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 16, 7:00 AM CDT, 1 hour 15 minutes earlier.

Area forecast discussion, Jun 16, 7:00 AM CDT, 1 hour 15 minutes before

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

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In the hours before

Local storm report, Jun 16, 4:42 AM CDT, 3 hours 33 minutes before

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Special weather statement, Jun 16, 4:48 AM CDT, 3 hours 27 minutes before

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Local storm report, Jun 16, 4:53 AM CDT, 3 hours 22 minutes before

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Special weather statement, Jun 16, 6:43 AM CDT, 1 hour 32 minutes before

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Special weather statement, Jun 16, 7:37 AM CDT, 38 minutes before

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Special weather statement, Jun 16, 8:15 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, 6:43 AM CDT	Special Weather Statement	LSX	Greene	47 min
Jun 16, 7:37 AM CDT	Special Weather Statement	LSX	Greene, Macoupin, Montgomery	38 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.