Alert archive / Iowa / Winter Storm Watches in 2017

Winter Storm Watch 1, NWS Quad Cities, IA

January 12, 201721 counties in Iowa; 7 counties in Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this winter storm watch at Jan 12, 2017, 3:33 PM CST for 21 counties in Iowa; 7 counties in Illinois; Clark County, Scotland County, Missouri. It took effect at Jan 15, 2017, 6:00 AM CST. It was in force for .

The area

The counties it named.

The facts

Issued: Jan 12, 2017, 3:33 PM CST (21:33 UTC)
In effect from: Jan 15, 2017, 6:00 AM CST
Expired: Jan 14, 2017, 3:47 PM CST
In force
Issued by: NWS Quad Cities, IA

All 30 counties

Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Hancock County, IL, Henderson County, IL, Henry County, IL, McDonough County, IL, Mercer County, IL, Rock Island County, IL, Warren County, IL, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 63 km from the middle of the area, began a volume at 21:30 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, 9.6 hours before the alert went out and 265 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: 520 m above ground
0-6 km bulk shear: 99 kt
0-1 km storm-relative helicity: 694 m²/s²
0-3 km storm-relative helicity: 803 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter storm 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 winter storm watch went out at Jan 11, 5:01 PM CST, 22 hours 32 minutes earlier.

Area forecast discussion, Jan 11, 5:01 PM CST, 22 hours 32 minutes before

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Nearby

Winter Storm Watches in Iowa, 2017 Winter Storm Watches in Illinois, 2017 Winter Storm Watches in Missouri, 2017 Every winter storm watch in 2017

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.