Alert archive / Wisconsin / Frost Advisories in 2021

Frost Advisory 3, NWS La Crosse, WI

May 8, 2021Clark County, Taylor County, Wisconsin

NWS La Crosse, WI issued this frost advisory at May 8, 2021, 5:51 PM CDT for Clark County, Taylor County, Wisconsin. It took effect at May 9, 2021, 1:00 AM CDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued
May 8, 2021, 5:51 PM CDT (22:51 UTC)
In effect from
May 9, 2021, 1:00 AM CDT
Expired
May 9, 2021, 8:00 AM CDT
In force
7 hr
Issued by
NWS La Crosse, WI

Counties Clark County, WI, Taylor County, WI

The radar

The La Crosse radar (KARX), 138 km from the middle of the area, began a volume at 22:53 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 10.9 hours before the alert went out and 202 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, Green Bay/Straub, WI at 12:00Z on 2021-05-08Temperature 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, Green Bay/Straub, WI at 12:00Z on 2021-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 square meters per square second.1939587897117136Sfc1 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
1416 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
-12 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

059 
WWUS73 KARX 082251
NPWARX

URGENT - WEATHER MESSAGE
National Weather Service La Crosse WI
551 PM CDT Sat May 8 2021

WIZ017-029-091300-
/O.NEW.KARX.FR.Y.0003.210509T0600Z-210509T1300Z/
Taylor-Clark-
Including the cities of Medford and Neillsville
551 PM CDT Sat May 8 2021

...FROST ADVISORY IN EFFECT FROM 1 AM TO 8 AM CDT SUNDAY...

* WHAT...Temperatures dipping into the low to mid 30s late 
  tonight will result in frost formation.

* WHERE...Taylor and Clark Counties.

* WHEN...From 1 AM to 8 AM CDT Sunday.

* IMPACTS...Frost could kill sensitive outdoor vegetation if 
  left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

Kurz
1 follow-up statement
607 
WWUS73 KARX 091257
NPWARX

URGENT - WEATHER MESSAGE
National Weather Service La Crosse WI
757 AM CDT Sun May 9 2021

...Temperatures Warming Above Freezing...

.Temperatures have warmed above freezing. Therefore, the frost
advisory has been allowed to expire.

WIZ017-029-091400-
/O.EXP.KARX.FR.Y.0003.000000T0000Z-210509T1300Z/
Taylor-Clark-
Including the cities of Medford and Neillsville
757 AM CDT Sun May 9 2021

...FROST ADVISORY WILL EXPIRE AT 8 AM CDT THIS MORNING...

Temperatures have warmed above freezing. Therefore, the frost
advisory has been allowed to expire.

$$

das

Nearby

Frost Advisories in Wisconsin, 2021Every frost 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.