Alert archive / Illinois / Flash Flood Watches in 2015

Flash Flood Watch 12, NWS Lincoln, IL

December 25, 201521 counties in Illinois

NWS Lincoln, IL issued this flash flood watch at Dec 25, 2015, 3:27 AM CST for 21 counties in Illinois. It took effect at Dec 26, 2015, 12:00 PM CST. It was in force for 4 days.

The area

The counties it named.

The facts

Issued
Dec 25, 2015, 3:27 AM CST (09:27 UTC)
In effect from
Dec 26, 2015, 12:00 PM CST
Expired
Dec 30, 2015, 1:30 PM CST
In force
4 days
Issued by
NWS Lincoln, IL
Flood severity
None
All 21 counties

Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Jasper County, IL, Lawrence County, IL, Macon County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Richland County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Vermilion County, IL

The radar

The Lincoln radar (KILX), 102 km from the middle of the area, began a volume at 09:24 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 00:00Z, 9.5 hours before the alert went out and 77 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, Lincoln, IL at 00:00Z on 2015-12-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Lincoln, IL at 00:00Z on 2015-12-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 415 square meters per square second.1939587897117136Sfc1 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
1212 m above ground
0-6 km bulk shear
109 kt
0-1 km storm-relative helicity
415 m²/s²
0-3 km storm-relative helicity
609 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Dec 24, 11:15 PM CST, 4 hours 12 minutes earlier.

Area forecast discussion, Dec 24, 11:15 PM CST, 4 hours 12 minutes before
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Hazardous weather outlook, Dec 24, 3:19 PM CST, 12 hours 8 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LINCOLN IL
319 PM CST THU DEC 24 2015

ILZ027>031-037-251200-
KNOX-MARSHALL-PEORIA-STARK-TAZEWELL-WOODFORD-
319 PM CST THU DEC 24 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
ILLINOIS.

.DAY ONE...TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

PRECIPITATION AMOUNTS OF 1 TO 2 INCHES ARE LIKELY THROUGH THE
PERIOD...MOSTLY FALLING FROM SATURDAY THROUGH SUNDAY...AND AGAIN
MONDAY AFTERNOON THROUGH TUESDAY. THESE MAY BE ACCOMPANIED BY
THUNDERSTORMS AT TIMES. FLOODING MAY DEVELOP ALONG THE ILLINOIS
RIVER NEAR PEORIA AS A RESULT...AND OTHER RIVERS MAY ALSO APPROACH
FLOOD STAGE.

BY MONDAY NIGHT AND TUESDAY...THE PRECIPITATION MAY MIX WITH OR
CHANGE OVER TO SNOW. AT THIS TIME...THERE IS SOME UNCERTAINTY AS
TO THE AMOUNT OF SNOW THAT MAY OCCUR.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED THROUGH TONIGHT.

ILZ036-040-041-047-049-050-251200-
CASS-FULTON-MASON-MORGAN-SCHUYLER-SCOTT-
319 PM CST THU DEC 24 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WEST CENTRAL ILLINOIS.

.DAY ONE...TONIGHT

FLOODING WILL CONTINUE ALONG MUCH OF THE ILLINOIS RIVER INTO NEXT
WEEK. OTHERWISE...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

PERIODS OF MODERATE TO HEAVY RAIN ARE EXPECTED FROM SATURDAY
THROUGH TUESDAY...ACCOMPANIED BY THUNDERSTORMS AT TIMES. AMOUNTS
OF AROUND 2 INCHES ARE LIKELY. THIS WILL LIKELY ENHANCE THE
ONGOING FLOODING ALONG THE ILLINOIS RIVER.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED THROUGH TONIGHT.

ILZ038-042>046-048-051>057-061-251200-
CHAMPAIGN-CHRISTIAN-COLES-DE WITT-DOUGLAS-EDGAR-LOGAN-MACON-
MCLEAN-MENARD-MOULTRIE-PIATT-SANGAMON-SHELBY-VERMILION-
319 PM CST THU DEC 24 2015

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

.DAY ONE...TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

PERIODS OF MODERATE TO HEAVY RAIN ARE EXPECTED FROM SATURDAY
THROUGH MONDAY NIGHT...ACCOMPANIED BY THUNDERSTORMS AT TIMES.
AMOUNTS OF 2 TO 4 INCHES ARE LIKELY...WITH THE HEAVIER TOTALS
CLOSER TO THE I-70 CORRIDOR. THIS WILL LIKELY RESULT IN THE
DEVELOPMENT OF RIVER FLOODING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED THROUGH TONIGHT.

ILZ062-063-066>068-071>073-251200-
CLARK-CLAY-CRAWFORD-CUMBERLAND-EFFINGHAM-JASPER-LAWRENCE-RICHLAND-
319 PM CST THU DEC 24 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST ILLINOIS.

.DAY ONE...TONIGHT

MINOR FLOODING WILL CONTINUE ALONG THE LITTLE WABASH RIVER NEAR
CLAY CITY INTO EARLY NEXT WEEK. OTHERWISE...NO HAZARDOUS WEATHER
IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

AN EXTENDED PERIOD OF MODERATE TO HEAVY RAIN IS EXPECTED FROM
FRIDAY NIGHT THROUGH MONDAY NIGHT. AMOUNTS OF 4 TO 6 INCHES ARE
POSSIBLE. THIS WILL LIKELY RESULT IN THE DEVELOPMENT OF MORE
WIDESPREAD RIVER FLOODING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED THROUGH TONIGHT.

GEELHART

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 24, 9:56 PM CSTRiver Flood WarningILXPeoria, Tazewell, Woodford27 days
Dec 24, 10:27 PM CSTRiver Flood WarningILXLawrence17 days

Nearby

Flash Flood Watches in Illinois, 2015Every flash flood watch in 2015

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.