Alert archive / Illinois / Flash Flood Watches in 2018

Flash Flood Watch 3, NWS Quad Cities, IA

June 26, 20187 counties in Illinois

NWS Quad Cities, IA issued this flash flood watch at Jun 26, 2018, 3:18 AM CDT for 7 counties in Illinois. It took effect at Jun 26, 2018, 1:00 PM CDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jun 26, 2018, 3:18 AM CDT (08:18 UTC)
In effect from: Jun 26, 2018, 1:00 PM CDT
Expired: Jun 26, 2018, 9:28 PM CDT
In force: 8 hr
Issued by: NWS Quad Cities, IA
Flood severity: None

Counties Bureau County, IL, Carroll County, IL, Henry County, IL, Jo Daviess County, IL, Putnam County, IL, Stephenson County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 67 km from the middle of the area, began a volume at 08:18 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, 8.3 hours before the alert went out and 60 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: 111 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 1023 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 283 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Quad Cities, IA wrote its last area forecast discussion before this flash flood watch went out at Jun 26, 12:57 AM CDT, 2 hours 21 minutes earlier.

Area forecast discussion, Jun 26, 12:57 AM CDT, 2 hours 21 minutes before

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Hazardous weather outlook, Jun 25, 10:21 PM CDT, 4 hours 57 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 26, 11:09 AM CDT	River Flood Warning	DVN	Dubuque	6 days
Jun 26, 11:26 AM CDT	River Flood Watch	DVN	Lee	3 days
Jun 26, 12:11 PM CDT	Special Weather Statement	DVN	Dubuque	49 min
Jun 26, 4:28 PM CDT	Special Weather Statement	DVN	Scott	32 min
Jun 26, 6:00 PM CDT	Special Weather Statement	DVN	Clinton	45 min
Jun 26, 12:25 PM CDT	Special Weather Statement	DVN	Jo Daviess, Stephenson	65 min
Jun 26, 4:50 PM CDT	Special Weather Statement	DVN	Jo Daviess	55 min
Jun 26, 6:57 PM CDT	Special Weather Statement	DVN	Mercer	48 min
Jun 26, 3:56 PM CDT	Special Weather Statement	DVN	Clark	34 min

Nearby

Flash Flood Watches in Illinois, 2018 Every flash flood watch in 2018

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.