Alert archive / Illinois / Flash Flood Warnings in 2016

Flash Flood Warning 21, NWS Lincoln, IL

August 12, 2016Logan County, Mason County, Tazewell County, Illinois

NWS Lincoln, IL issued this flash flood warning at Aug 12, 2016, 7:31 PM CDT for Logan County, Mason County, Tazewell County, Illinois. It was in force for 3 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 12, 2016, 7:31 PM CDT (00:31 UTC)
Expired
Aug 12, 2016, 10:30 PM CDT
In force
3 hr
Issued by
NWS Lincoln, IL
Area
Storm-based polygon
Flood severity
None

Counties Logan County, IL, Mason County, IL, Tazewell County, IL

The radar

The Lincoln radar (KILX), 35 km from the middle of the area, began a volume at 00:31 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.

What was reported inside it

TimeReportWhereRemark
Aug 12, 10:00 PM CDTHEAVY RAIN 6.08San Jose, IL.
Aug 12, 10:00 PM CDTHEAVY RAIN 8Delavan, IL.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.5 hours before the alert went out and 155 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°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

The text

As transmitted.

498 
WGUS53 KILX 130031
FFWILX
ILC107-125-179-130330-
/O.NEW.KILX.FF.W.0021.160813T0031Z-160813T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
731 PM CDT FRI AUG 12 2016

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN LOGAN COUNTY IN CENTRAL ILLINOIS...
  EASTERN MASON COUNTY IN CENTRAL ILLINOIS...
  SOUTHEASTERN TAZEWELL COUNTY IN CENTRAL ILLINOIS...

* UNTIL 1030 PM CDT

* AT 729 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED THAT
  FLASH FLOODING CONTINUES IN RESPONSE TO RECENT HEAVY RAIN.
  FLOODING WAS REPORTED 1 MILE SOUTH OF SAN JOSE IN NORTHWEST LOGAN
  COUNTY...AND FLOODING CONTINUES NEAR HOPEDALE. RADAR HAS ESTIMATED
  THAT TOTALS OF 4 TO 7 INCHES HAVE OCCURRED IN THIS GENERAL AREA. 
  WHILE THE RAIN HAS TAPERED OFF SOMEWHAT...ADDITIONAL HEAVY RAIN IS
  EXPECTED TO TRACK EAST ACROSS MASON COUNTY TO PROLONG THE
  FLOODING. 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  MASON CITY...MORTON...TREMONT...MACKINAW...DELAVAN...HOPEDALE...
  GREEN VALLEY...SAN JOSE...EMDEN AND DILLON.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 INTERSTATE 155 BETWEEN MILE MARKERS 11 AND 28.
 INTERSTATE 74 NEAR MILE MARKER 106.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 4063 8939 4039 8933 4013 8978 4032 8987

$$

GEELHART
1 follow-up statement
780 
WGUS73 KILX 130324
FFSILX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
1024 PM CDT FRI AUG 12 2016

ILC107-125-179-130334-
/O.EXP.KILX.FF.W.0021.000000T0000Z-160813T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LOGAN-MASON-TAZEWELL-
1024 PM CDT FRI AUG 12 2016

...THE FLASH FLOOD WARNING FOR NORTHWESTERN LOGAN...EASTERN MASON AND
SOUTHEASTERN TAZEWELL COUNTIES WILL EXPIRE AT 1030 PM CDT...

FLOOD WATERS HAVE RECEDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 4063 8939 4039 8933 4013 8978 4032 8987

$$

SHIMON

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 7:37 PM CDTSpecial Weather StatementILXChristian53 min
Aug 12, 8:26 PM CDTAreal Flood AdvisoryILXChristian, Sangamon3 hr
Aug 12, 9:59 PM CDTAreal Flood WarningILXSangamon6 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

Flash Flood Warnings in Illinois, 2016Every flash 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.