Alert archive / Illinois / Special Weather Statements in 2018

Special Weather Statement, NWS St. Louis, MO

May 26, 2018Adams County, Illinois

NWS St. Louis, MO issued this special weather statement at May 26, 2018, 6:45 PM CDT for Adams County, Illinois. It was in force for 30 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
May 26, 2018, 6:45 PM CDT (23:45 UTC)
Expired
May 26, 2018, 7:15 PM CDT
In force
30 min
Issued by
NWS St. Louis, MO

County Adams County, IL

The radar

The St Louis radar (KLSX), 157 km from the middle of the area, began a volume at 23:45 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, 11.8 hours before the alert went out and 199 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, Davenport, at 12:00Z on 2018-05-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 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, Davenport, at 12:00Z on 2018-05-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 square meters per square second.1939Sfc1 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
2099 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
135 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

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 May 26, 6:01 PM CDT, 44 minutes earlier.

Area forecast discussion, May 26, 6:01 PM CDT, 44 minutes before
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Hazardous weather outlook, May 26, 4:34 PM CDT, 2 hours 11 minutes before
Hazardous Weather Outlook
National Weather Service Saint Louis MO
434 PM CDT Sat May 26 2018

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-271200-
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-
434 PM CDT Sat May 26 2018

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

.DAY ONE...Tonight

Isolated to scattered thunderstorms this evening. A couple of
storms may be strong to severe. Main threats will be hail,
damaging wind gusts, locally heavy rainfall, and frequent
lightning.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

There is a chance of thunderstorms each day from Sunday through
Friday of next week.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report any severe weather, if observed,
to the National Weather Service.

GKS

In the hours before

Special weather statement, May 26, 5:40 PM CDT, 1 hour 5 minutes before
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Local storm report, May 26, 5:41 PM CDT, 1 hour 4 minutes before
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Local storm report, May 26, 5:45 PM CDT, 1 hour before
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Local storm report, May 26, 6:37 PM CDT, 8 minutes before
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Special weather statement, May 26, 6:45 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 26, 5:40 PM CDTSpecial Weather StatementLSXLewis65 min
May 26, 5:45 PM CDTSevere Thunderstorm WarningLSXLewis45 min
May 26, 6:50 PM CDTSevere Thunderstorm WarningLSXLewis, Marion40 min
May 26, 4:24 PM CDTSevere Thunderstorm WarningLSXBrown66 min
May 26, 4:58 PM CDTSevere Thunderstorm WarningLSXAdams32 min
May 26, 5:28 PM CDTSevere Thunderstorm WarningLSXAdams, Brown, Pike62 min
May 26, 6:46 PM CDTSpecial Weather StatementLSXPike29 min

Nearby

Special Weather Statements in Illinois, 2018Every 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.