Alert archive / Illinois / Flash Flood Watches in 2019

Flash Flood Watch 3, NWS Lincoln, IL

May 21, 201922 counties in Illinois

NWS Lincoln, IL issued this flash flood watch at May 21, 2019, 3:47 AM CDT for 22 counties in Illinois. It took effect at May 21, 2019, 4:00 AM CDT. It was in force for 21 hr.

The area

The counties it named.

The facts

Issued: May 21, 2019, 3:47 AM CDT (08:47 UTC)
In effect from: May 21, 2019, 4:00 AM CDT
Expired: May 22, 2019, 1:00 AM CDT
In force: 21 hr
Issued by: NWS Lincoln, IL
Flood severity: None

All 22 counties

Cass County, IL, Christian County, IL, DeWitt County, IL, Fulton County, IL, Knox County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Stark County, IL, Tazewell County, IL, Woodford County, IL

The radar

The Lincoln radar (KILX), 20 km from the middle of the area, began a volume at 08:50 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 00:00Z, 8.8 hours before the alert went out and 82 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: 1293 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Lincoln, IL wrote its last area forecast discussion before this flash flood watch went out at May 21, 12:34 AM CDT, 3 hours 13 minutes earlier.

Area forecast discussion, May 21, 12:34 AM CDT, 3 hours 13 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 3:15 PM CDT	River Flood Warning	ILX	Fulton, Knox	13 days

Nearby

Flash Flood Watches in Illinois, 2019 Every flash flood watch in 2019

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.