Alert archive / Illinois / Flood Watches in 2020

Flood Watch 4, NWS Lincoln, IL

October 28, 2020Lawrence County, Richland County, Illinois

NWS Lincoln, IL issued this flood watch at Oct 28, 2020, 2:45 PM CDT for Lawrence County, Richland County, Illinois. It took effect at Oct 28, 2020, 10:00 PM CDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued
Oct 28, 2020, 2:45 PM CDT (19:45 UTC)
In effect from
Oct 28, 2020, 10:00 PM CDT
Expired
Oct 29, 2020, 10:06 AM CDT
In force
12 hr
Issued by
NWS Lincoln, IL
Flood severity
None

Counties Lawrence County, IL, Richland County, IL

The radar

The Evansville,IN radar (KVWX), 53 km from the middle of the area, began a volume at 19:46 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

Nashville Metro, TN (KBNA), launched 12:00Z, 7.8 hours before the alert went out and 310 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, Nashville Metro, TN at 12:00Z on 2020-10-28Temperature 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, Nashville Metro, TN at 12:00Z on 2020-10-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 square meters per square second.19395878Sfc1 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
557 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

Nearby

Flood Watches in Illinois, 2020Every flood watch in 2020

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.