Alert archive / Illinois / Heat Advisories in 2010

Heat Advisory 13, NWS Lincoln, IL

July 21, 201035 counties in Illinois

NWS Lincoln, IL issued this heat advisory at Jul 21, 2010, 3:08 PM CDT for 35 counties in Illinois. It took effect at Jul 22, 2010, 12:00 PM CDT. It was in force for 39 hr.

The area

The counties it named.

The facts

Issued: Jul 21, 2010, 3:08 PM CDT (20:08 UTC)
In effect from: Jul 22, 2010, 12:00 PM CDT
Expired: Jul 24, 2010, 2:51 AM CDT
In force: 39 hr
Issued by: NWS Lincoln, IL

All 35 counties

Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fulton County, IL, Jasper County, IL, Knox County, IL, Lawrence County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Richland County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Woodford County, IL

The radar

The Lincoln radar (KILX), 42 km from the middle of the area, began a volume at 20:09 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, 8.1 hours before the alert went out and 46 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: 1868 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 559 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory 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 heat advisory went out at Jul 21, 2:54 PM CDT, 14 minutes earlier.

Area forecast discussion, Jul 21, 2:54 PM CDT, 14 minutes before

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Hazardous weather outlook, Jul 21, 11:27 AM CDT, 3 hours 41 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LINCOLN IL
1127 AM CDT WED JUL 21 2010

ILZ027>031-037-038-221100-
KNOX-MARSHALL-MCLEAN-PEORIA-STARK-TAZEWELL-WOODFORD-
1127 AM CDT WED JUL 21 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
ILLINOIS.

.DAY ONE...THIS AFTERNOON AND TONIGHT

SCATTERED THUNDERSTORMS WILL BE POSSIBLE ACROSS THE AREA THIS
AFTERNOON AND EVENING...DUE TO A STATIONARY FRONT IN NORTHERN
ILLINOIS...AND A RESIDUAL OUTFLOW BOUNDARY ACROSS MISSOURI. THERE
IS A SLIGHT RISK THAT THESE STORMS WILL BECOME SEVERE...WITH
DAMAGING WIND GUSTS THE PRIMARY CONCERN. LOCALLY HEAVY RAINFALL IS
ALSO POSSIBLE WITH SOME OF THE STRONGER STORMS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THUNDERSTORMS ARE EXPECTED ON THURSDAY..AS THE FRONTAL BOUNDARY
GRADUALLY SHIFTS NORTHWARD ACROSS THE AREA. ANY STORMS THAT OCCUR
WILL BE CAPABLE OF PRODUCING LOCALLY HEAVY RAINFALL AND POSSIBLY
SOME DAMAGING WINDS. AFTER A SHORT BREAK...THUNDERSTORMS WILL BE
POSSIBLE AGAIN LATE FRIDAY AND SATURDAY AS A COLD FRONT SLOWLY
APPROACHES THE AREA FROM THE NORTHWEST.

HEAT INDEX VALUES ARE EXPECTED TO BE AROUND 100 DEGREES FRIDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND
EVENING...PRIMARILY THROUGH SUNSET.

ILZ036-040-041-047-049-050-221100-
CASS-FULTON-MASON-MORGAN-SCHUYLER-SCOTT-
1127 AM CDT WED JUL 21 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL
ILLINOIS.

.DAY ONE...THIS AFTERNOON AND TONIGHT

SCATTERED THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON AND
EVENING...DUE TO A RESIDUAL OUTFLOW BOUNDARY ACROSS MISSOURI AND
SOUTHERN ILLINOIS. THERE IS A SLIGHT RISK THAT THESE STORMS WILL
BECOME SEVERE...WITH DAMAGING WINDS THE PRIMARY THREAT. A FEW OF
THE STRONGER STORMS WILL ALSO BE CAPABLE OF PRODUCING AND HEAVY
RAINFALL. AS A WARM FRONT APPROACHES TONIGHT...BETTER COVERAGE OF
THUNDERSTORMS IS EXPECTED. THE PRIMARY THREAT TONIGHT FROM THE
THUNDERSTORMS WILL BE FROM HEAVY RAINFALL AND GUSTY WINDS.

MINOR FLOODING IS EXPECTED ALONG PORTIONS OF THE ILLINOIS
RIVER...PERSISTING INTO THE WEEKEND.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

ADDITIONAL THUNDERSTORMS WILL BE POSSIBLE THURSDAY...AS THE WARM
FRONT SHIFTS NORTH OF THE AREA. ANY STORMS THAT OCCUR WILL BE
CAPABLE OF PRODUCING LOCALLY HEAVY RAINFALL AND POSSIBLY SOME
DAMAGING WINDS. RUN OFF FROM THIS RAINFALL WILL LEAD TO
SIGNIFICANT RISES ON MANY AREA CREEKS AND STREAMS. AFTER A PERIOD
OF QUIET WEATHER...THUNDERSTORMS WILL BE POSSIBLE AGAIN ON
SATURDAY AS A COLD FRONT APPROACHES FROM THE NORTHWEST.

HEAT INDEX VALUES ARE EXPECTED TO BE AROUND 100 DEGREES THURSDAY...
AND FROM 100 TO 105 DEGREES FRIDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND
EVENING...PRIMARILY THROUGH SUNSET.

ILZ042>046-048-051>057-061>063-221100-
CHAMPAIGN-CHRISTIAN-CLARK-COLES-CUMBERLAND-DE WITT-DOUGLAS-EDGAR-
LOGAN-MACON-MENARD-MOULTRIE-PIATT-SANGAMON-SHELBY-VERMILION-
1127 AM CDT WED JUL 21 2010

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

SCATTERED THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON AND
EVENING...DUE TO A RESIDUAL OUTFLOW BOUNDARY ACROSS MISSOURI AND
SOUTHERN ILLINOIS. THERE IS A SLIGHT RISK THAT THESE STORMS WILL
BECOME SEVERE...WITH DAMAGING WINDS THE PRIMARY THREAT. A FEW OF
THE STRONGER STORMS WILL ALSO BE CAPABLE OF PRODUCING AND HEAVY
RAINFALL. AS A WARM FRONT APPROACHES TONIGHT...BETTER COVERAGE OF
THUNDERSTORMS IS EXPECTED. THE PRIMARY THREAT TONIGHT FROM THE
THUNDERSTORMS WILL BE FROM HEAVY RAINFALL AND GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

ADDITIONAL THUNDERSTORMS WILL BE POSSIBLE THURSDAY...AS THE WARM
FRONT SHIFTS NORTH OF THE AREA. ANY STORMS THAT OCCUR WILL BE
CAPABLE OF PRODUCING LOCALLY HEAVY RAINFALL AND POSSIBLY SOME
DAMAGING WINDS. RUN OFF FROM THIS RAINFALL WILL LEAD TO
SIGNIFICANT RISES ON MANY AREA CREEKS AND STREAMS. AFTER A PERIOD
OF QUIET WEATHER...THUNDERSTORMS WILL BE POSSIBLE AGAIN ON
SATURDAY AS A COLD FRONT APPROACHES FROM THE NORTHWEST.

HEAT INDEX VALUES ARE EXPECTED TO RANGE FROM 95 TO 100 DEGREES
THURSDAY...AND FROM 100 TO 105 DEGREES FRIDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND
EVENING...PRIMARILY BETWEEN 2 PM AND 8 PM.

ILZ066>068-071>073-221100-
CLAY-CRAWFORD-EFFINGHAM-JASPER-LAWRENCE-RICHLAND-
1127 AM CDT WED JUL 21 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST
ILLINOIS.

.DAY ONE...THIS AFTERNOON AND TONIGHT

SCATTERED THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON AND
EVENING...DUE TO A RESIDUAL OUTFLOW BOUNDARY ACROSS MISSOURI AND
SOUTHERN ILLINOIS. THERE IS A SLIGHT RISK THAT THESE STORMS WILL
BECOME SEVERE...WITH DAMAGING WINDS THE PRIMARY THREAT. A FEW OF
THE STRONGER STORMS WILL ALSO BE CAPABLE OF PRODUCING AND HEAVY
RAINFALL. AS A WARM FRONT APPROACHES TONIGHT...BETTER COVERAGE OF
THUNDERSTORMS IS EXPECTED. THE PRIMARY THREAT TONIGHT FROM THE
THUNDERSTORMS WILL BE FROM HEAVY RAINFALL AND GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

ADDITIONAL THUNDERSTORMS WILL BE POSSIBLE THURSDAY AS THE WARM
FRONT SHIFTS NORTH OF THE AREA. ANY STORMS THAT OCCUR WILL ONCE
AGAIN BE CAPABLE OF PRODUCING LOCALLY HEAVY RAINFALL. RUN OFF
FROM THIS RAINFALL WILL LEAD TO ADDITIONAL RISES ON MANY AREA
CREEKS AND STREAMS. AFTER A PERIOD OF QUIET WEATHER...THUNDERSTORMS
WILL BE POSSIBLE AGAIN LATER ON SATURDAY AS A COLD FRONT
APPROACHES FROM THE NORTHWEST.

HEAT INDEX VALUES ARE EXPECTED TO BE NEAR 100 DEGREES TODAY AND
THURSDAY...AND APPROACHING 105 DEGREES ON FRIDAY.

THE LITTLE WABASH RIVER WILL REMAIN ABOVE FLOOD STAGE MUCH OF THE
WEEK. LOWER PORTIONS OF THE EMBARRAS RIVER MAY RISE ABOVE FLOOD
STAGE BY THIS EVENING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND
EVENING...PRIMARILY BETWEEN 3 PM AND 9 PM.

GEELHART

In the hours before

Local storm report, Jul 21, 1:27 PM CDT, 1 hour 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
127 PM CDT WED JUL 21 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0124 PM     TORNADO          1 N SIDELL              39.92N 87.82W
07/21/2010                   VERMILION          IL   TRAINED SPOTTER

            RELAYED BY VERMILION COUNTY EMA

&&

GEELHART

Local storm report, Jul 21, 1:35 PM CDT, 1 hour 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LINCOLN IL
135 PM CDT WED JUL 21 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0134 PM     FUNNEL CLOUD     JAMAICA                 39.98N 87.80W
07/21/2010                   VERMILION          IL   TRAINED SPOTTER

            RELAYED BY VERMILION COUNTY EMA

&&

GEELHART

Local storm report, Jul 21, 1:52 PM CDT, 1 hour 16 minutes before

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Special weather statement, Jul 21, 3:02 PM 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
Jul 20, 8:46 PM CDT	River Flood Warning	ILX	Lawrence	3 days
Jul 21, 1:52 AM CDT	Special Weather Statement	ILX	Clay, Crawford, Jasper, Lawrence, Richland	53 min
Jul 21, 1:25 PM CDT	Tornado Warning	ILX	Vermilion	35 min
Jul 21, 1:38 PM CDT	Areal Flood Advisory	ILX	DeWitt, Macon, Piatt	3 hr
Jul 21, 1:46 PM CDT	Tornado Warning	ILX	Champaign, Piatt	44 min
Jul 21, 2:03 PM CDT	Tornado Warning	ILX	Vermilion	28 min
Jul 21, 4:30 PM CDT	Areal Flood Advisory	ILX	McLean	3 hr

Nearby

Heat Advisories in Illinois, 2010 Every heat advisory 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.