Alert archive / Illinois / Flash Flood Watches in 2015

Flash Flood Watch 11, NWS Lincoln, IL

July 16, 201514 counties in Illinois

NWS Lincoln, IL issued this flash flood watch at Jul 16, 2015, 4:06 AM CDT for 14 counties in Illinois. It took effect at Jul 16, 2015, 9:00 AM CDT. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued: Jul 16, 2015, 4:06 AM CDT (09:06 UTC)
In effect from: Jul 16, 2015, 9:00 AM CDT
Expired: Jul 17, 2015, 1:00 AM CDT
In force: 16 hr
Issued by: NWS Lincoln, IL
Flood severity: None

Counties Champaign County, IL, DeWitt County, IL, Fulton County, IL, Knox County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McLean County, IL, Peoria County, IL, Piatt County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Woodford County, IL

The radar

The Lincoln radar (KILX), 39 km from the middle of the area, began a volume at 09:06 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

Green Bay/Straub, WI (KGRB), launched 00:00Z, 9.1 hours before the alert went out and 453 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: 1398 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 72 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 Jul 16, 4:01 AM CDT, 5 minutes earlier.

Area forecast discussion, Jul 16, 4:01 AM CDT, 5 minutes before

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Nearby

Flash Flood Watches in Illinois, 2015 Every flash flood watch 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.