Alert archive / Illinois / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 23, NWS Lincoln, IL

May 1, 2010Clark County, Crawford County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at May 1, 2010, 12:51 AM CDT for Clark County, Crawford County, Illinois. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 1, 2010, 12:51 AM CDT (05:51 UTC)
Expired: May 1, 2010, 1:17 AM CDT
In force: 26 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Clark County, IL, Crawford County, IL

The radar

The Evansville,IN radar (KVWX), 101 km from the middle of the area, began a volume at 05:54 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 30, 9:03 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 5.9 hours before the alert went out and 130 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: 1090 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 718 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 340 m²/s²
0-3 km storm-relative helicity: 345 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 10.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at May 1, 12:25 AM CDT, 26 minutes earlier.

Area forecast discussion, May 1, 12:25 AM CDT, 26 minutes before

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Hazardous weather outlook, Apr 30, 3:04 PM CDT, 9 hours 47 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LINCOLN IL
304 PM CDT FRI APR 30 2010

ILZ027>031-036>038-040>044-047>054-061-011100-
CASS-CHRISTIAN-DE WITT-FULTON-KNOX-LOGAN-MACON-MARSHALL-MASON-
MCLEAN-MENARD-MORGAN-MOULTRIE-PEORIA-PIATT-SANGAMON-SCHUYLER-
SCOTT-SHELBY-STARK-TAZEWELL-WOODFORD-
304 PM CDT FRI APR 30 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL ILLINOIS.

.DAY ONE...TONIGHT

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THROUGH THIS
EVENING...AS A COLD FRONT SLOWLY APPROACHES ILLINOIS FROM THE WEST.
TORNADOES...WIND DAMAGE...AND LARGE HAIL ARE POSSIBLE. AREAS WEST
OF I-55 WILL SEE THE GREATEST SEVERE WEATHER THREAT...WITH
LOCATIONS EAST OF I-55 SEEING MORE OF A WIND DAMAGE THREAT.

AHEAD OF THE STORMS...SOUTHERLY WINDS WILL GUST UP TO 40 MPH AT
TIMES. THIS SHOULD BEGIN TO DIMINISH EARLY THIS EVENING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THUNDERSTORMS ARE EXPECTED TO DEVELOP AGAIN SATURDAY NIGHT. AT
THE PRESENT TIME...THE SEVERE WEATHER THREAT SHOULD BE LOCATED IN
SOUTHEAST ILLINOIS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS LIKELY THROUGH MUCH OF THE EVENING.

ILZ045-046-055>057-011100-
CHAMPAIGN-COLES-DOUGLAS-EDGAR-VERMILION-
304 PM CDT FRI APR 30 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL ILLINOIS.

.DAY ONE...TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS...PRIMARILY THIS
EVENING. A COLD FRONT WILL SLOWLY APPROACH ILLINOIS FROM THE
WEST...WITH THUNDERSTORMS MOVING ACROSS ILLINOIS THROUGH THE
EVENING. DAMAGING WINDS WILL BE THE PRIMARY THREAT. AREAS WEST OF
I-57 MAY ALSO SEE SOME LARGE HAIL AND ISOLATED TORNADOES.

WINDY CONDITIONS WILL CONTINUE INTO EARLY EVENING...AS SOUTHERLY
WINDS GUST UP TO 40 MPH.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THUNDERSTORMS WILL DIMINISH BY EARLY SATURDAY...BUT ARE EXPECTED TO
DEVELOP AGAIN SATURDAY NIGHT. AT THE PRESENT TIME...THE SEVERE
WEATHER THREAT IS EXPECTED TO BE SOUTH OF I-70. HOWEVER...LOCALLY
HEAVY RAIN WILL BE POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS LIKELY THIS EVENING.

ILZ062-063-066>068-071>073-011100-
CLARK-CLAY-CRAWFORD-CUMBERLAND-EFFINGHAM-JASPER-LAWRENCE-RICHLAND-
304 PM CDT FRI APR 30 2010

...FLASH FLOOD WATCH SATURDAY NIGHT...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST ILLINOIS.

.DAY ONE...TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING...AS A
COLD FRONT SLOWLY APPROACHES ILLINOIS FROM THE WEST. DAMAGING
WINDS WILL BE THE PRIMARY THREAT. AREAS WEST OF I-57 MAY ALSO SEE
SOME LARGE HAIL AND ISOLATED TORNADOES.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THUNDERSTORMS WILL DIMINISH BY EARLY SATURDAY...BUT WILL LIKELY
DEVELOP AGAIN SATURDAY NIGHT. THERE IS A SLIGHT RISK OF SEVERE
STORMS. HEAVY RAINS ARE ALSO LIKELY...WHICH MAY CAUSE FLASH
FLOODING AND RIVER FLOODING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED BETWEEN 5 PM AND MIDNIGHT.

GEELHART

In the hours before

Special weather statement, May 1, 12:09 AM CDT, 42 minutes before

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Local storm report, May 1, 12:16 AM CDT, 35 minutes before

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Special weather statement, May 1, 12:25 AM CDT, 26 minutes before

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Local storm report, May 1, 12:28 AM CDT, 23 minutes before

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Local storm report, May 1, 12:42 AM CDT, 9 minutes before

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Local storm report, May 1, 12:45 AM CDT, 6 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
Apr 30, 7:52 PM CDT	Severe Thunderstorm Warning	ILX	Marshall	21 min
Apr 30, 7:59 PM CDT	Severe Thunderstorm Warning	ILX	Marshall	20 min
Apr 30, 11:45 PM CDT	Special Weather Statement	ILX	Clay	60 min
May 1, 12:09 AM CDT	Special Weather Statement	ILX	Crawford, Jasper, Lawrence, Richland	51 min
May 1, 12:19 AM CDT	Areal Flood Advisory	ILX	Clay, Cumberland, Effingham, Jasper, Richland	4 hr
May 1, 12:25 AM CDT	Special Weather Statement	ILX	Clark, Cumberland	65 min
May 1, 12:37 AM CDT	Severe Thunderstorm Warning	ILX	Crawford, Lawrence	38 min
May 1, 9:24 AM CDT	River Flood Warning	ILX	Clay, Richland	5 days

Nearby

Severe Thunderstorm Warnings in Illinois, 2010 Every severe thunderstorm warning in 2010

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.