Alert archive / Missouri / Frost Advisories in 2016

Frost Advisory 2, NWS St. Louis, MO

October 20, 2016Adams County, Brown County, Pike County, Illinois; 6 counties in Missouri

NWS St. Louis, MO issued this frost advisory at Oct 20, 2016, 2:59 PM CDT for Adams County, Brown County, Pike County, Illinois; 6 counties in Missouri. It took effect at Oct 21, 2016, 4:00 AM CDT. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Oct 20, 2016, 2:59 PM CDT (19:59 UTC)
In effect from
Oct 21, 2016, 4:00 AM CDT
Expired
Oct 21, 2016, 8:00 AM CDT
In force
4 hr
Issued by
NWS St. Louis, MO

Counties Adams County, IL, Brown County, IL, Pike County, IL, Knox County, MO, Lewis County, MO, Marion County, MO, Monroe County, MO, Ralls County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 146 km from the middle of the area, began a volume at 20:01 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

Davenport, (KDVN), launched 12:00Z, 8.0 hours before the alert went out and 218 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, Davenport, at 12:00Z on 2016-10-20Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2016-10-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 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
1439 m above ground
0-6 km bulk shear
71 kt
0-1 km storm-relative helicity
2 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.

120 
WWUS73 KLSX 201959
NPWLSX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAINT LOUIS MO
ISSUED BY NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
259 PM CDT THU OCT 20 2016

ILZ095>097-MOZ018-019-026-027-034-035-211100-
/O.NEW.KLSX.FR.Y.0002.161021T0900Z-161021T1300Z/
ADAMS IL-BROWN IL-KNOX MO-LEWIS MO-MARION MO-MONROE MO-PIKE IL-
RALLS MO-SHELBY MO-
INCLUDING THE CITIES OF...HANNIBAL...MOUNT STERLING...
PITTSFIELD...QUINCY
259 PM CDT THU OCT 20 2016

...FROST ADVISORY IN EFFECT FROM 4 AM TO 8 AM CDT FRIDAY...

THE NATIONAL WEATHER SERVICE IN SAINT LOUIS HAS ISSUED A FROST
ADVISORY...WHICH IS IN EFFECT FROM 4 AM TO 8 AM CDT FRIDAY.

* TIMING...EARLY FRIDAY MORNING.

* TEMPERATURES...IN THE MIDDLE TO UPPER 30S.

* IMPACTS...SENSITIVE PLANTS AND TREES MAY BE DAMAGED OR KILLED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FROST ADVISORY MEANS THAT WIDESPREAD FROST IS EXPECTED. THOSE
WITH AGRICULTURAL INTERESTS IN THE ADVISORY AREA SHOULD PROTECT
TENDER VEGETATION. ALSO...POTTED PLANTS NORMALLY LEFT OUTDOORS
SHOULD BE COVERED OR BROUGHT INSIDE AWAY FROM THE COLD.

&&

$$

WFO LSX
1 follow-up statement
179 
WWUS73 KLSX 211247
NPWLSX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAINT LOUIS MO
747 AM CDT FRI OCT 21 2016


ILZ095>097-MOZ018-019-026-027-034-035-211400-
/O.EXP.KLSX.FR.Y.0002.000000T0000Z-161021T1300Z/
ADAMS IL-BROWN IL-KNOX MO-LEWIS MO-MARION MO-MONROE MO-PIKE IL-
RALLS MO-SHELBY MO-
INCLUDING THE CITIES OF...HANNIBAL...MOUNT STERLING...
PITTSFIELD...QUINCY
747 AM CDT FRI OCT 21 2016

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

TEMPERATURES ARE WARMING UP, SO THE FROST ADVISORY WILL BE ALLOWED
TO EXPIRE AT 8 AM.

$$

BYRD

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 19, 7:49 PM CDTSevere Thunderstorm WarningLSXFayette41 min
Oct 19, 11:20 PM CDTAreal Flood AdvisoryLSXMonroe, Saint Clair4 hr
Oct 19, 11:39 PM CDTFlash Flood WarningLSXMonroe8 hr
Oct 20, 12:22 AM CDTSpecial Weather StatementLSXMacoupin38 min
Oct 20, 12:26 AM CDTSpecial Weather StatementLSXMacoupin49 min
Oct 20, 4:08 AM CDTSpecial Weather StatementLSXMadison52 min
Oct 19, 7:37 PM CDTSevere Thunderstorm WarningLSXMadison, Sainte Genevieve, Saint Francois23 min

Nearby

Frost Advisories in Missouri, 2016Frost Advisories in Illinois, 2016Every frost advisory in 2016

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.