Alert archive / Illinois / Areal Flood Warnings in 2016

Areal Flood Warning 2, NWS Lincoln, IL

August 12, 2016Sangamon County, Illinois

NWS Lincoln, IL issued this areal flood warning at Aug 12, 2016, 9:59 PM CDT for Sangamon County, Illinois. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 12, 2016, 9:59 PM CDT (02:59 UTC)
Expired
Aug 13, 2016, 4:00 AM CDT
In force
6 hr
Issued by
NWS Lincoln, IL
Area
Storm-based polygon
Flood severity
None

County Sangamon County, IL

The radar

The Lincoln radar (KILX), 52 km from the middle of the area, began a volume at 03:02 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 00:00Z, 3.0 hours before the alert went out and 219 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 00:00Z on 2016-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 85 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 00:00Z on 2016-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.193958Sfc1 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
85 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
901 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
51 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 areal flood 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 areal flood warning went out at Aug 12, 9:02 PM CDT, 57 minutes earlier.

Area forecast discussion, Aug 12, 9:02 PM CDT, 57 minutes before
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Hazardous weather outlook, Aug 12, 3:16 PM CDT, 6 hours 43 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LINCOLN IL
316 PM CDT FRI AUG 12 2016

ILZ027>031-036-037-040-041-047>050-131100-
CASS-FULTON-KNOX-MARSHALL-MASON-MENARD-MORGAN-PEORIA-SCHUYLER-
SCOTT-STARK-TAZEWELL-WOODFORD-
316 PM CDT FRI AUG 12 2016

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

.DAY ONE...TONIGHT

PERIODS OF THUNDERSTORMS ARE EXPECTED THIS EVENING...WITH THE
STORMS DIMINISHING AFTER MIDNIGHT. WHILE THESE ARE NOT EXPECTED
TO BE SEVERE...LOCALLY HEAVY RAINFALL IS POSSIBLE.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

A FEW STORMS MAY LINGER EAST OF THE ILLINOIS RIVER EARLY
SATURDAY...BUT BETTER THUNDERSTORM CHANCES RETURN FOR MONDAY AND
TUESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT.

ILZ038-042>046-051>057-061-131100-
CHAMPAIGN-CHRISTIAN-COLES-DE WITT-DOUGLAS-EDGAR-LOGAN-MACON-
MCLEAN-MOULTRIE-PIATT-SANGAMON-SHELBY-VERMILION-
316 PM CDT FRI AUG 12 2016

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

.DAY ONE...TONIGHT

NUMEROUS THUNDERSTORMS ARE EXPECTED THROUGH TONIGHT...WITH THE
THREAT OF STORMS DIMINISHING WEST OF I-55 AFTER MIDNIGHT. WHILE
WIDESPREAD SEVERE WEATHER IS NOT EXPECTED...A FEW OF THE STORMS
MAY CONTAIN STRONG WIND GUSTS AND FREQUENT LIGHTNING.
HOWEVER...LOCALLY HEAVY RAINFALL IS ANTICIPATED.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THE THREAT OF THUNDERSTORMS WILL DIMINISH ON SATURDAY...BUT WILL
RETURN FOR MONDAY THROUGH TUESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING...MAINLY THROUGH 10
PM.

ILZ062-063-066>068-071>073-131100-
CLARK-CLAY-CRAWFORD-CUMBERLAND-EFFINGHAM-JASPER-LAWRENCE-RICHLAND-
316 PM CDT FRI AUG 12 2016

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

.DAY ONE...TONIGHT

NUMEROUS THUNDERSTORMS ARE EXPECTED BY MID TO LATE EVENING...
CONTINUING OVERNIGHT. THESE STORMS ARE NOT EXPECTED TO BE SEVERE.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SEVERAL ROUNDS OF THUNDERSTORMS ARE POSSIBLE ACROSS SOUTHEAST
ILLINOIS THROUGH THE WEEKEND...AND INTO EARLY NEXT WEEK. RAINFALL
FROM SATURDAY THROUGH TUESDAY WILL AVERAGE FROM 2 TO 4 INCHES
ACROSS THE AREA...WITH HIGHER AMOUNTS FURTHER SOUTH TOWARD THE
OHIO RIVER. THIS MAY CAUSE FLOODING...ESPECIALLY ALONG CREEKS AND
STREAMS...WITH FLOODING ON LARGER RIVERS POSSIBLE BY EARLY NEXT
WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT.

GEELHART

In the hours before

Local storm report, Aug 12, 9:16 PM CDT, 43 minutes before
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Local storm report, Aug 12, 9:19 PM CDT, 40 minutes before
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Local storm report, Aug 12, 9:23 PM CDT, 36 minutes before
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Local storm report, Aug 12, 9:25 PM CDT, 34 minutes before
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Local storm report, Aug 12, 9:27 PM CDT, 32 minutes before
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Local storm report, Aug 12, 9:57 PM CDT, 2 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 7:31 PM CDTFlash Flood WarningILXLogan, Mason, Tazewell3 hr
Aug 12, 7:37 PM CDTSpecial Weather StatementILXChristian53 min
Aug 12, 8:26 PM CDTAreal Flood AdvisoryILXChristian, Sangamon3 hr
Aug 13, 3:20 AM CDTFlash Flood WatchILXChampaign, Christian, Clark, Clay, Coles, Crawford and 13 more3 days
Aug 13, 12:36 PM CDTFlash Flood WarningILXClay4 hr

Nearby

Areal Flood Warnings in Illinois, 2016Every areal flood warning in 2016

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.