Alert archive / Illinois / Flash Flood Warnings in 2004

Flash Flood Warning 61, NWS Lincoln, IL

August 25, 2004Mason County, Illinois

NWS Lincoln, IL issued this flash flood warning at Aug 25, 2004, 3:42 PM CDT for Mason County, Illinois. It was in force for 6 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 25, 2004, 3:42 PM CDT (20:42 UTC)
Expired: Aug 25, 2004, 9:45 PM CDT
In force: 6 hr
Issued by: NWS Lincoln, IL
Area: Counties, with a storm outline in the text

County Mason County, IL

The radar

The Lincoln radar (KILX), 57 km from the middle of the area, began a volume at 20:43 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

Time	Report	Where	Remark
Aug 25, 5:46 PM CDT	FLASH FLOOD	Mason City, IL	STREET FLOODING REPORTED IN MASON CITY.
Aug 25, 5:46 PM CDT	FLASH FLOOD	Mason City, IL	STREET FLOODING REPORTED IN MASON CITY.

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

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 8.7 hours before the alert went out and 119 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: 1166 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 777 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 179 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS53 KILX 252044
FFWILX
ILC125-260245-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LINCOLN IL
342 PM CDT WED AUG 25 2004

THE NATIONAL WEATHER SERVICE IN LINCOLN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MASON COUNTY IN CENTRAL ILLINOIS

* UNTIL 945 PM CDT

* AT 337 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN HAS FALLEN NEAR SNICARTE TO KILBOURN. 1 TO 3 
  INCHES OF RAIN HAS BEEN ESTIMATED SINCE 200 PM.

* THUNDERSTORMS WITH EXCESSIVE RAINFALL WILL CONTINUE ACROSS
  MASON COUNTY. RAINFALL AMOUNTS WILL LIKELY RANGE FROM 2 TO
  6 INCHES BY 700 PM. THESE RAINFALL AMOUNTS WILL LIKELY
  PRODUCE FLASH FLOODING.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF IN A FLOOD PRONE AREA...MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG CREEKS AND STREAMS ARE ESPECIALLY VULNERABLE
TO THE EFFECTS OF FLASH FLOODING. DO NOT ATTEMPT TO CROSS FLOODED
AREAS BY FOOT OR AUTOMOBILE.

MOST DEATHS IN FLASH FLOODING OCCUR IN AUTOMOBILES. DO NOT DRIVE YOUR
VEHICLE INTO AREAS IN WHICH WATER COVERS THE ROADWAY. IT ONLY TAKES
A FOOT OR TWO OF WATER TO WASH MOST VEHICLES AWAY. VEHICLES CAUGHT IN
RISING WATERS SHOULD BE ABANDONED QUICKLY.

REPORT FLASH FLOODING TO YOUR LOCAL ESDA...OR THE NEAREST LAW
ENFORCEMENT AGENCY...FOR RELAY TO THE NATIONAL WEATHER SERVICE. STAY
TUNED FOR LATER STATEMENTS.

LAT...LON 4021 9016 4009 9021 4020 8964 4042 8984

$$

EH

NNNN

2 follow-up statements

000 
WGUS73 KILX 252205
FFSILX
ILC125-260245-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
505 PM CDT WED AUG 25 2004

...A FLASH FLOOD WARNING CONTINUES FOR MASON COUNTY UNTIL 945 PM
CDT...

AT 501 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
HEAVY RAINS CONTINUING FROM NEAR KILBOURNE EAST TO MASON CITY.
1 TO 4 INCHES OF RAIN INCHES OF RAIN HAS BEEN ESTIMATED SINCE 200 PM.
EXPECT ADDITIONAL THUNDERSTORMS TO DEVELOP THROUGHOUT THE EVENING 
ACROSS MASON COUNTY.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF IN A FLOOD PRONE AREA...MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG CREEKS AND STREAMS ARE ESPECIALLY VULNERABLE
TO THE EFFECTS OF FLASH FLOODING. DO NOT ATTEMPT TO CROSS FLOODED
AREAS BY FOOT OR AUTOMOBILE.

MOST DEATHS IN FLASH FLOODING OCCUR IN AUTOMOBILES. DO NOT DRIVE YOUR
VEHICLE INTO AREAS IN WHICH WATER COVERS THE ROADWAY. IT ONLY TAKES A
FOOT OR TWO OF WATER TO WASH MOST VEHICLES AWAY. VEHICLES CAUGHT IN
RISING WATERS SHOULD BE ABANDONED QUICKLY.

REPORT FLASH FLOODING TO YOUR LOCAL ESDA...OR THE NEAREST LAW
ENFORCEMENT AGENCY...FOR RELAY TO THE NATIONAL WEATHER SERVICE. STAY
TUNED FOR LATER STATEMENTS.

LAT...LON 4015 9023 4024 9012 4038 9005 4044 8992
      4043 8973 4033 8973 4032 8961 4015 8961
      4017 8966 4014 8975 4015 8998 4007 9014
      4006 9024 4013 9035

$$

EH

000 
WGUS73 KILX 260245
FFSILX
ILC125-260300-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LINCOLN IL
945 PM CDT WED AUG 25 2004

...THE FLASH FLOOD WARNING FOR MASON COUNTY IS BEING ALLOWED TO
EXPIRE...

THE HEAVY RAINFALL AND FLOOD THREAT HAS ENDED ACROSS THE WARNED AREA.
THEREFORE...THE FLASH FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE.

LAT...LON 4042 8979 4018 8967 4010 9016 4035 9003

$$
SMITH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 10:56 AM CDT	Severe Thunderstorm Warning	ILX	Fulton, Mason	64 min
Aug 25, 1:02 PM CDT	Severe Thunderstorm Warning	ILX	Morgan, Scott	58 min
Aug 25, 2:01 PM CDT	Severe Thunderstorm Warning	ILX	Cass, Menard, Morgan, Sangamon	59 min
Aug 25, 2:49 PM CDT	Flash Flood Warning	ILX	Schuyler	6 hr
Aug 25, 3:07 PM CDT	Flash Flood Warning	ILX	Cass, Morgan, Scott	6 hr
Aug 25, 4:07 PM CDT	Severe Thunderstorm Warning	ILX	Mason	38 min
Aug 25, 4:30 PM CDT	Flash Flood Warning	ILX	Menard	6 hr
Aug 25, 5:37 PM CDT	Flash Flood Warning	ILX	Logan, Sangamon	6 hr
Aug 25, 5:52 PM CDT	Flash Flood Warning	ILX	DeWitt, McLean, Macon	6 hr
Aug 25, 5:55 PM CDT	Severe Thunderstorm Warning	ILX	Morgan, Sangamon	65 min
Aug 25, 6:40 PM CDT	Flash Flood Warning	ILX	Christian	6 hr
Aug 25, 6:45 PM CDT	Flash Flood Warning	ILX	Tazewell	6 hr

Nearby

Flash Flood Warnings in Illinois, 2004 Every flash flood warning in 2004

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.