Alert archive / Iowa / Winter Weather Advisories in 2021

Winter Weather Advisory 1, NWS Quad Cities, IA

January 13, 202111 counties in Iowa; Carroll County, Jo Daviess County, Stephenson County, Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this winter weather advisory at Jan 13, 2021, 2:53 PM CST for 11 counties in Iowa; Carroll County, Jo Daviess County, Stephenson County, Illinois; Clark County, Scotland County, Missouri. It took effect at Jan 14, 2021, 6:00 AM CST. It was in force for 29 hr.

The area

The counties it named.

The facts

Issued
Jan 13, 2021, 2:53 PM CST (20:53 UTC)
In effect from
Jan 14, 2021, 6:00 AM CST
Expired
Jan 15, 2021, 11:02 AM CST
In force
29 hr
Issued by
NWS Quad Cities, IA

Counties Benton County, IA, Buchanan County, IA, Delaware County, IA, Dubuque County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Van Buren County, IA, Carroll County, IL, Jo Daviess County, IL, Stephenson County, IL, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 65 km from the middle of the area, began a volume at 20:58 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

Minneapolis, MN (KMPX), launched 12:00Z, 8.9 hours before the alert went out and 389 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, Minneapolis, MN at 12:00Z on 2021-01-13Temperature 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, Minneapolis, MN at 12:00Z on 2021-01-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 square meters per square second.193958Sfc1 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
1374 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
67 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

Nearby

Winter Weather Advisories in Iowa, 2021Winter Weather Advisories in Illinois, 2021Winter Weather Advisories in Missouri, 2021Every winter weather advisory in 2021

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.