Alert archive / Illinois / Frost Advisories in 2019

Frost Advisory 1, NWS Quad Cities, IA

October 13, 201912 counties in Iowa; 13 counties in Illinois; Clark County, Missouri

NWS Quad Cities, IA issued this frost advisory at Oct 13, 2019, 1:52 PM CDT for 12 counties in Iowa; 13 counties in Illinois; Clark County, Missouri. It took effect at Oct 14, 2019, 1:00 AM CDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Oct 13, 2019, 1:52 PM CDT (18:52 UTC)
In effect from: Oct 14, 2019, 1:00 AM CDT
Expired: Oct 14, 2019, 9:00 AM CDT
In force: 8 hr
Issued by: NWS Quad Cities, IA

All 26 counties

Cedar County, IA, Clinton County, IA, Des Moines County, IA, Henry County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Bureau County, IL, Carroll County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, McDonough County, IL, Mercer County, IL, Putnam County, IL, Rock Island County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Clark County, MO

The radar

The Quad Cities radar (KDVN), 25 km from the middle of the area, began a volume at 18:50 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 12:00Z, 6.9 hours before the alert went out and 227 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: 1884 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 52 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 frost advisory 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 frost advisory went out at Oct 12, 2:48 PM CDT, 23 hours 4 minutes earlier.

Area forecast discussion, Oct 12, 2:48 PM CDT, 23 hours 4 minutes before

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Hazardous weather outlook, Oct 12, 6:21 PM CDT, 19 hours 31 minutes before

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Nearby

Frost Advisories in Illinois, 2019 Frost Advisories in Iowa, 2019 Frost Advisories in Missouri, 2019 Every frost advisory 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.