Alert archive / Minnesota / Winter Storm Watches in 2018

Winter Storm Watch 4, NWS La Crosse, WI

February 22, 2018Buffalo County, Clark County, Taylor County, Wisconsin; Mitchell County, Iowa; 4 counties in Minnesota

NWS La Crosse, WI issued this winter storm watch at Feb 22, 2018, 3:17 PM CST for Buffalo County, Clark County, Taylor County, Wisconsin; Mitchell County, Iowa; 4 counties in Minnesota. It took effect at Feb 24, 2018, 3:00 PM CST. It was in force for .

The area

The counties it named.

The facts

Issued
Feb 22, 2018, 3:17 PM CST (21:17 UTC)
In effect from
Feb 24, 2018, 3:00 PM CST
Expired
Feb 23, 2018, 2:38 PM CST
In force
Issued by
NWS La Crosse, WI

Counties Mitchell County, IA, Dodge County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Buffalo County, WI, Clark County, WI, Taylor County, WI

The radar

The La Crosse radar (KARX), 77 km from the middle of the area, began a volume at 21:16 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, 9.3 hours before the alert went out and 146 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 2018-02-22Temperature 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 2018-02-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 204 square meters per square second.1939587897117Sfc1 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
1937 m above ground
0-6 km bulk shear
74 kt
0-1 km storm-relative helicity
204 m²/s²
0-3 km storm-relative helicity
131 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 22, 3:04 AM CSTWinter Weather AdvisoryARXAdams, Buffalo, Clark, Crawford, Grant, Jackson and 7 more30 hr

Nearby

Winter Storm Watches in Minnesota, 2018Winter Storm Watches in Wisconsin, 2018Winter Storm Watches in Iowa, 2018Every winter storm 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.