Alert archive / Arkansas / Wind Chill Advisories in 2017

Wind Chill Advisory 1, NWS Little Rock, AR

December 30, 20177 counties in Arkansas

NWS Little Rock, AR issued this wind chill advisory at Dec 30, 2017, 4:50 AM CST for 7 counties in Arkansas. It took effect at Dec 30, 2017, 6:00 PM CST. It was in force for 66 hr.

The area

The counties it named.

The facts

Issued
Dec 30, 2017, 4:50 AM CST (10:50 UTC)
In effect from
Dec 30, 2017, 6:00 PM CST
Expired
Jan 2, 2018, 12:00 PM CST
In force
66 hr
Issued by
NWS Little Rock, AR

Counties Baxter County, AR, Fulton County, AR, Independence County, AR, Izard County, AR, Marion County, AR, Sharp County, AR, Stone County, AR

The radar

The Little Rock radar (KLZK), 144 km from the middle of the area, began a volume at 10:54 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

Little Rock, AR (KBYH), launched 00:00Z, 10.8 hours before the alert went out and 234 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, Little Rock, AR at 00:00Z on 2017-12-30Temperature 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, Little Rock, AR at 00:00Z on 2017-12-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 327 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
1363 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
327 m²/s²
0-3 km storm-relative helicity
384 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Little Rock, AR issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 30, 4:50 AM CSTWinter Weather AdvisoryLZKDesha, Drew31 hr

Nearby

Wind Chill Advisories in Arkansas, 2017Every wind chill advisory 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.