Alert archive / Illinois / Flash Flood Warnings in 2015

Flash Flood Warning 9, NWS Quad Cities, IA

June 20, 2015Jo Daviess County, Stephenson County, Illinois

NWS Quad Cities, IA issued this flash flood warning at Jun 20, 2015, 6:26 PM CDT for Jo Daviess County, Stephenson County, 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 20, 2015, 6:26 PM CDT (23:26 UTC)
Expired
Jun 20, 2015, 9:00 PM CDT
In force
3 hr
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Flood severity
None

Counties Jo Daviess County, IL, Stephenson County, IL

The radar

The Quad Cities radar (KDVN), 102 km from the middle of the area, began a volume at 23:30 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 12:00Z, 11.4 hours before the alert went out and 98 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 12:00Z on 2015-06-20Temperature 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, Davenport, at 12:00Z on 2015-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
769 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
77 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.

744 
WGUS53 KDVN 202326
FFWDVN
ILC085-177-210200-
/O.NEW.KDVN.FF.W.0009.150620T2326Z-150621T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
626 PM CDT SAT JUN 20 2015

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  STEPHENSON COUNTY IN NORTHWESTERN ILLINOIS...
  JO DAVIESS COUNTY IN NORTHWESTERN ILLINOIS...

* UNTIL 900 PM CDT
            
* AT 622 PM CDT...DOPPLER RADAR INDICATED ANOTHER ROUND OF 
  THUNDERSTORMS PRODUCING HEAVY RAIN MOVING INTO THE WARNED AREA. 
  TWO TO THREE INCHES OF RAIN HAVE ALREADY FALLEN AND AN ADDITIONAL 
  INCH OF RAIN IS POSSIBLE IN THE WARNED AREA. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF WATERS RISE...MOVE TO HIGHER GROUND. ACT QUICKLY TO PROTECT YOUR 
LIFE.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4250 8961 4239 8940 4220 8940 4220 9014
      4233 9039 4250 9064

$$

DMD
2 follow-up statements
565 
WGUS73 KDVN 210123
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
823 PM CDT SAT JUN 20 2015

ILC085-177-210200-
/O.CON.KDVN.FF.W.0009.000000T0000Z-150621T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
STEPHENSON IL-JO DAVIESS IL-
823 PM CDT SAT JUN 20 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 PM CDT FOR
STEPHENSON AND JO DAVIESS COUNTIES...

AT 820 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING 
HEAVY RAIN MOVING EAST ACROSS THE WARNED AREA...GENERALLY FROM 
HANOVER TO FREEPORT. UP TO THREE INCHES OF RAIN HAVE ALREADY 
FALLEN...AND ANOTHER INCH IS POSSIBLE BEFORE THE STORMS END.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD 
DEATHS OCCUR IN VEHICLES.  BE ESPECIALLY CAREFUL AT NIGHT WHEN IT IS 
HARD TO ACCURATELY EVALUATE THE RISK. 

&&

LAT...LON 4250 8961 4239 8940 4220 8940 4220 9014
      4233 9039 4250 9064

$$

DMD
253 
WGUS73 KDVN 210153
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
853 PM CDT SAT JUN 20 2015

ILC085-177-210203-
/O.EXP.KDVN.FF.W.0009.000000T0000Z-150621T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
STEPHENSON IL-JO DAVIESS IL-
853 PM CDT SAT JUN 20 2015

...THE FLASH FLOOD WARNING FOR STEPHENSON AND JO DAVIESS COUNTIES
WILL EXPIRE AT 900 PM CDT...

THE HEAVY RAIN HAS ENDED...AND FLASH FLOODING IS NO LONGER EXPECTED 
TO POSE A THREAT.  


LAT...LON 4250 8961 4239 8940 4220 8940 4220 9014
      4233 9039 4250 9064

$$

DMD

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 20, 3:21 PM CDTSevere Thunderstorm WarningDVNJo Daviess24 min
Jun 20, 3:53 PM CDTSpecial Weather StatementDVNJo Daviess, Stephenson52 min
Jun 20, 4:08 PM CDTSpecial Weather StatementDVNJo Daviess, Stephenson52 min
Jun 20, 4:24 PM CDTSevere Thunderstorm WarningDVNStephenson25 min
Jun 20, 5:04 PM CDTSpecial Weather StatementDVNStephenson26 min

Nearby

Flash Flood Warnings in Illinois, 2015Every 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.