Alert archive / Illinois / Flash Flood Warnings in 2017

Flash Flood Warning 7, NWS St. Louis, MO

April 29, 20175 counties in Illinois

NWS St. Louis, MO issued this flash flood warning at Apr 29, 2017, 5:20 PM CDT for 5 counties in Illinois. It was in force for 8 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: Apr 29, 2017, 5:20 PM CDT (22:20 UTC)
Expired: Apr 30, 2017, 1:15 AM CDT
In force: 8 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Calhoun County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Montgomery County, IL

The radar

The St Louis radar (KLSX), 69 km from the middle of the area, began a volume at 22:21 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

Lincoln, IL (KILX), launched 12:00Z, 10.3 hours before the alert went out and 173 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 776 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 242 m²/s²
0-3 km storm-relative helicity: 568 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

830 
WGUS53 KLSX 292220
FFWLSX
ILC013-061-083-117-135-300615-
/O.NEW.KLSX.FF.W.0007.170429T2220Z-170430T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
520 PM CDT SAT APR 29 2017

The National Weather Service in St Louis has issued a

* Flash Flood Warning for...
  Eastern Calhoun County in southwestern Illinois...
  Greene County in southwestern Illinois...
  Macoupin County in southwestern Illinois...
  Jersey County in southwestern Illinois...
  Western Montgomery County in south central Illinois...

* Until 115 AM CDT Sunday.

* At 519 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Radar estimates that 2 to 4 
  inches of rain has already fallen across the area since late last 
  night. An additional 1 to 2 inches of rain is possible through 
  this evening.

* Some locations that will experience flooding include...
  Jerseyville, Litchfield, Carlinville, Staunton, Virden, Gillespie,
  White Hall, Carrollton, Brighton, Girard, Mount Olive, Roodhouse,
  Bunker Hill, Benld, Greenfield, Raymond, Hardin, White Oak,
  Farmersville and Palmyra.

This includes Interstate 55 in Illinois between exits 41 and 63.
 
This also includes  Pere Marquette State Park, Beaver Dam State Park,
and Lake Lou Yaeger.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Please report flooding to your local law enforcement agency when you
can do so safely.

&&

LAT...LON 3900 8970 3900 9027 3892 9029 3897 9048
      3887 9056 3893 9067 3926 9061 3943 9062
      3952 9058 3952 8954 3935 8953 3935 8951

$$

TES

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 28, 9:14 PM CDT	River Flood Warning	LSX	Fayette	10 days
Apr 28, 9:36 PM CDT	River Flood Warning	LSX	Brown	36 days
Apr 28, 9:36 PM CDT	River Flood Warning	LSX	Morgan, Pike	36 days
Apr 28, 9:36 PM CDT	River Flood Warning	LSX	Pike, Scott	40 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Adams	20 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Adams	19 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Adams	10 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Pike	20 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Calhoun	43 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Madison	40 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Saint Clair	16 days
Apr 28, 10:18 PM CDT	River Flood Warning	LSX	Jackson, Randolph	43 days
Apr 29, 12:41 AM CDT	Severe Thunderstorm Warning	LSX	Randolph	49 min
Apr 29, 3:53 AM CDT	Flash Flood Warning	LSX	Randolph	22 hr
Apr 29, 9:58 AM CDT	Special Weather Statement	LSX	Bond	47 min
Apr 29, 2:53 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun	52 min
Apr 29, 3:08 PM CDT	Flash Flood Warning	LSX	Adams, Calhoun, Pike	8 hr
Apr 29, 3:24 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey, Macoupin, Madison	51 min
Apr 29, 3:56 PM CDT	Tornado Warning	LSX	Jersey, Macoupin, Madison	16 min
Apr 29, 4:03 PM CDT	Severe Thunderstorm Warning	LSX	Jersey, Macoupin, Madison, Montgomery	42 min
Apr 29, 4:42 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Fayette, Macoupin, Madison, Montgomery	48 min
Apr 29, 5:16 PM CDT	River Flood Warning	LSX	Brown	7 days
Apr 29, 5:29 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Marion, Montgomery	61 min

Nearby

Flash Flood Warnings in Illinois, 2017 Every flash flood warning in 2017

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.