Alert archive / Illinois / Special Weather Statements in 2012

Special Weather Statement, NWS Lincoln, IL

May 20, 2012Champaign County, Illinois

NWS Lincoln, IL issued this special weather statement at May 20, 2012, 6:56 PM CDT for Champaign County, Illinois. It was in force for 64 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 20, 2012, 6:56 PM CDT (23:56 UTC)
Expired: May 20, 2012, 8:00 PM CDT
In force: 64 min
Issued by: NWS Lincoln, IL

County Champaign County, IL

The radar

The Lincoln radar (KILX), 130 km from the middle of the area, began a volume at 23:59 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, 11.9 hours before the alert went out and 69 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: 616 J/kg
Mixed-layer CIN: -119 J/kg
Mixed-layer LCL: 1773 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -67 m²/s²
0-3 km storm-relative helicity: -55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Lincoln, IL wrote its last area forecast discussion before this special weather statement went out at May 20, 6:54 PM CDT, 2 minutes earlier.

Area forecast discussion, May 20, 6:54 PM CDT, 2 minutes before

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Hazardous weather outlook, May 20, 3:09 PM CDT, 3 hours 47 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LINCOLN IL
309 PM CDT SUN MAY 20 2012

ILZ027>031-036>038-040>042-047-048-211100-
CASS-FULTON-KNOX-LOGAN-MARSHALL-MASON-MCLEAN-MENARD-PEORIA-
SCHUYLER-STARK-TAZEWELL-WOODFORD-
309 PM CDT SUN MAY 20 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
ILLINOIS.

.DAY ONE...TONIGHT

A COLD FRONT APPROACHING FROM THE WEST WILL BRING SCATTERED
THUNDERSTORMS TO PARTS OF CENTRAL ILLINOIS THIS AFTERNOON INTO
EARLY THIS EVENING. THERE IS A SLIGHT RISK THAT A FEW OF THE
THUNDERSTORMS FROM MID AFTERNOON THROUGH EARLY THIS EVENING MAY
BECOME SEVERE...CONTAINING GUSTY WINDS AND LARGE HAIL BEFORE THE
STORMS WEAKEN AFTER SUNSET.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED FROM MID AFTERNOON THROUGH EARLY
THIS EVENING. THE PRIMARY TIME FRAME FOR THUNDERSTORMS AND POSSIBLE
SPOTTER ACTIVATION TODAY WOULD BE FROM 300 PM UNTIL 700 PM THIS
EVENING.

ILZ043>046-049>057-061>063-066>068-071>073-211100-
CHAMPAIGN-CHRISTIAN-CLARK-CLAY-COLES-CRAWFORD-CUMBERLAND-DE WITT-
DOUGLAS-EDGAR-EFFINGHAM-JASPER-LAWRENCE-MACON-MORGAN-MOULTRIE-
PIATT-RICHLAND-SANGAMON-SCOTT-SHELBY-VERMILION-
309 PM CDT SUN MAY 20 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
ILLINOIS...EAST CENTRAL ILLINOIS AND SOUTHEAST ILLINOIS.

.DAY ONE...TONIGHT

A COLD FRONT APPROACHING FROM THE WEST LATE TODAY WILL BRING SCATTERED
THUNDERSTORMS TO PARTS OF CENTRAL ILLINOIS THIS AFTERNOON INTO EARLY
THIS EVENING. ALTHOUGH NO ORGANIZED SEVERE WEATHER IS ANTICIPATED
AT THIS TIME...A FEW OF THE THUNDERSTORMS FROM LATE THIS AFTERNOON
THROUGH THIS EVENING MAY CONTAIN GUSTY WINDS AND HAIL BEFORE THE
STORMS WEAKEN AFTER SUNSET.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT.

HJS

In the hours before

Local storm report, May 20, 6:21 PM CDT, 35 minutes before

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Local storm report, May 20, 6:22 PM CDT, 34 minutes before

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Local storm report, May 20, 6:23 PM CDT, 33 minutes before

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Local storm report, May 20, 6:42 PM CDT, 14 minutes before

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Local storm report, May 20, 6:48 PM CDT, 8 minutes before

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Special weather statement, May 20, 6:56 PM CDT, 0 minutes before

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The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 20, 4:00 PM CDT	Flash Flood Warning	ILX	Effingham	6 hr
May 20, 4:54 PM CDT	Special Weather Statement	ILX	Sangamon	51 min
May 20, 5:04 PM CDT	Special Weather Statement	ILX	Logan	41 min
May 20, 5:36 PM CDT	Special Weather Statement	ILX	Logan	54 min
May 20, 5:38 PM CDT	Severe Thunderstorm Warning	ILX	Logan, Sangamon	37 min
May 20, 5:46 PM CDT	Severe Thunderstorm Warning	ILX	Morgan, Sangamon	44 min
May 20, 6:11 PM CDT	Severe Thunderstorm Warning	ILX	Logan, Mason, Tazewell	49 min

Nearby

Special Weather Statements in Illinois, 2012 Every special weather statement in 2012

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.