Alert archive / Illinois / Flash Flood Warnings in 2015

Flash Flood Warning 21, NWS Chicago, IL

June 22, 20155 counties in Illinois

NWS Chicago, IL issued this flash flood warning at Jun 22, 2015, 8:59 PM CDT for 5 counties in Illinois. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 22, 2015, 8:59 PM CDT (01:59 UTC)
Expired: Jun 23, 2015, 12:00 AM CDT
In force: 3 hr
Issued by: NWS Chicago, IL
Area: Storm-based polygon
Flood severity: None

Counties DeKalb County, IL, Grundy County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL

The radar

The Chicago radar (KLOT), 70 km from the middle of the area, began a volume at 02:00 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, 2.0 hours before the alert went out and 132 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: 1958 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 925 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 401 m²/s²
0-3 km storm-relative helicity: 441 m²/s²
Significant tornado parameter: 5.7
Supercell composite: 17.5

Open this sounding in Storm Lab

The text

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

518 
WGUS53 KLOT 230159
FFWLOT
ILC037-063-093-099-103-230500-
/O.NEW.KLOT.FF.W.0021.150623T0159Z-150623T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
859 PM CDT MON JUN 22 2015

THE NATIONAL WEATHER SERVICE IN CHICAGO  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN DE KALB COUNTY IN NORTH CENTRAL ILLINOIS...
  NORTHERN LA SALLE COUNTY IN NORTH CENTRAL ILLINOIS...
  EAST CENTRAL LEE COUNTY IN NORTH CENTRAL ILLINOIS...
  WESTERN KENDALL COUNTY IN NORTHEASTERN ILLINOIS...
  NORTHWESTERN GRUNDY COUNTY IN NORTHEASTERN ILLINOIS...

* UNTIL MIDNIGHT CDT
    
* AT 858 PM CDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING   
  HEAVY RAIN ACROSS THE WARNED AREA. ALONG AND NORTH OF A MENDOTA TO 
  SHERIDAN LINE IN LA SALLE COUNTY RADAR ESTIMATES GREATER THAN 2   
  INCHES OF RAIN HAS FALLEN IN THE PAST HOUR. ADDITIONAL HEAVY RAIN  
  IS EXPECTED. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  OTTAWA...PLANO...SANDWICH...MENDOTA...SERENA...SHABBONA...LA
  SALLE...SHERIDAN...SOMONAUK...EARLVILLE...WATERMAN...NEWARK...
  LELAND...PAW PAW...MILLINGTON...LEE...LISBON AND TROY GROVE.

THIS INCLUDES... SANDWICH FAIRGROUNDS AND TRI-COUNTY FAIRGROUNDS.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

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

&&

LAT...LON 4157 8916 4158 8897 4185 8899 4166 8850
      4136 8848 4137 8917

$$

BEACHLER

2 follow-up statements

557 
WGUS73 KLOT 230320
FFSLOT

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1020 PM CDT MON JUN 22 2015

ILC037-063-093-099-103-230500-
/O.CON.KLOT.FF.W.0021.000000T0000Z-150623T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DE KALB IL-LA SALLE IL-LEE IL-KENDALL IL-GRUNDY IL-
1020 PM CDT MON JUN 22 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT FOR
SOUTHERN DE KALB...NORTHERN LA SALLE...EAST CENTRAL LEE...WESTERN
KENDALL AND NORTHWESTERN GRUNDY COUNTIES...

AT 1015 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING 
HEAVY RAIN ACROSS THE WARNED AREA. DOPPLER RADAR ESTIMATED BETWEEN 2 
AND 3 INCHES OF RAIN HAD FALLEN BETWEEN SHERIDAN AND NEWARK. THE 
INTENSE THUNDERSTORMS HAVE PASSED TO THE SOUTHEAST OF THE WARNED 
AREA...HOWEVER FLASH FLOODING IS STILL LIKELY THROUGH THE NEXT FEW 
HOURS.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
OTTAWA...PLANO...SANDWICH...MENDOTA...SERENA...SHABBONA...LA SALLE...
SHERIDAN...SOMONAUK...EARLVILLE...WATERMAN...NEWARK...LELAND...PAW
PAW...MILLINGTON...LEE...LISBON AND TROY GROVE. 

THIS INCLUDES... SANDWICH FAIRGROUNDS AND TRI-COUNTY FAIRGROUNDS.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

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

&&

LAT...LON 4157 8916 4158 8897 4185 8899 4166 8850
      4136 8848 4137 8917

$$

BEACHLER

975 
WGUS73 KLOT 230459
FFSLOT

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1159 PM CDT MON JUN 22 2015

ILC037-063-093-099-103-230506-
/O.EXP.KLOT.FF.W.0021.000000T0000Z-150623T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DE KALB IL-LA SALLE IL-LEE IL-KENDALL IL-GRUNDY IL-
1159 PM CDT MON JUN 22 2015

...THE FLASH FLOOD WARNING FOR SOUTHERN DE KALB...NORTHERN LA
SALLE...EAST CENTRAL LEE...WESTERN KENDALL AND NORTHWESTERN GRUNDY
COUNTIES WILL EXPIRE AT 1200 AM CDT...

AN AREAL FLOOD WARNING IS NOW IN EFFECT UNTIL 545 AM CDT.

LAT...LON 4157 8916 4158 8897 4185 8899 4166 8850
      4136 8848 4137 8917

$$

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 7:03 PM CDT	Tornado Warning	LOT	Lee	57 min
Jun 22, 7:30 PM CDT	Flash Flood Warning	LOT	LaSalle, Lee, Ogle	6 hr
Jun 22, 7:35 PM CDT	Tornado Warning	LOT	Lee	40 min
Jun 22, 8:03 PM CDT	Tornado Warning	LOT	LaSalle, Lee	42 min
Jun 22, 8:38 PM CDT	Tornado Warning Tornado observed	LOT	LaSalle	37 min
Jun 22, 9:06 PM CDT	Tornado Warning Tornado observed	LOT	Grundy, LaSalle	39 min
Jun 22, 9:28 PM CDT	Tornado Warning	LOT	Grundy	47 min
Jun 22, 9:38 PM CDT	Severe Thunderstorm Warning	LOT	Cook, Kankakee, Will	37 min
Jun 22, 9:53 PM CDT	Tornado Warning Tornado observed	LOT	Grundy, Kankakee, Will	32 min
Jun 22, 10:05 PM CDT	Flash Flood Warning	LOT	Grundy, Kendall, Will	7 hr
Jun 22, 10:09 PM CDT	Severe Thunderstorm Warning	LOT	Iroquois, Kankakee, Will	66 min
Jun 22, 10:12 PM CDT	Tornado Warning	LOT	Kankakee	18 min
Jun 22, 10:37 PM CDT	Severe Thunderstorm Warning	LOT	Grundy, Kankakee, LaSalle, Livingston, Will	53 min
Jun 22, 10:39 PM CDT	Flash Flood Warning	LOT	Grundy, Iroquois, Kankakee, Livingston, Will	8 hr
Jun 22, 11:17 PM CDT	Severe Thunderstorm Warning	LOT	Ford, Iroquois, Kankakee, Livingston	43 min
Jun 22, 11:22 PM CDT	Flash Flood Warning Emergency	LOT	Kankakee	7 hr
Jun 22, 11:23 PM CDT	Tornado Warning	LOT	Ford, Iroquois, Kankakee, Livingston	37 min
Jun 22, 11:34 PM CDT	River Flood Warning	LOT	LaSalle	46 hr
Jun 22, 11:43 PM CDT	Tornado Warning	LOT	Iroquois, Kankakee	26 min
Jun 22, 11:50 PM CDT	Areal Flood Warning	LOT	DeKalb, Grundy, Kendall, LaSalle, Lee	6 hr
Jun 23, 3:30 AM CDT	River Flood Advisory	LOT	Grundy	36 hr
Jun 23, 4:54 AM CDT	Areal Flood Warning	LOT	Grundy, Kankakee, Kendall, LaSalle, Lee, Will	30 hr
Jun 23, 6:24 AM CDT	River Flood Warning	LOT	Grundy	25 hr
Jun 23, 3:08 PM CDT	Flash Flood Watch	LOT	Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more	44 hr

Nearby

Flash Flood Warnings in Illinois, 2015 Every flash flood warning 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.