Alert archive / Missouri / Frost Advisories in 2021
Frost Advisory 2, NWS St. Louis, MO
NWS St. Louis, MO issued this frost advisory at Apr 14, 2021, 2:32 PM CDT for 20 counties in Missouri; 5 counties in Illinois. It took effect at Apr 15, 2021, 1:00 AM CDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Apr 14, 2021, 2:32 PM CDT (19:32 UTC)
- In effect from
- Apr 15, 2021, 1:00 AM CDT
- Expired
- Apr 15, 2021, 8:00 AM CDT
- In force
- 7 hr
- Issued by
- NWS St. Louis, MO
All 25 counties
Adams County, IL, Brown County, IL, Calhoun County, IL, Greene County, IL, Pike County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Shelby County, MO, Warren County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 85 km from the middle of the area, began a volume at 19:34 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, 7.5 hours before the alert went out and 272 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1376 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- -81 m²/s²
- 0-3 km storm-relative helicity
- 12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
959 WWUS73 KLSX 141932 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 232 PM CDT Wed Apr 14 2021 ILZ058-095>098-MOZ018-019-026-027-034>036-041-042-047>052-150900- /O.NEW.KLSX.FR.Y.0002.210415T0600Z-210415T1300Z/ Adams IL-Audrain MO-Boone MO-Brown IL-Calhoun IL-Callaway MO- Cole MO-Greene IL-Knox MO-Lewis MO-Lincoln MO-Marion MO- Moniteau MO-Monroe MO-Montgomery MO-Osage MO-Pike IL-Pike MO- Ralls MO-Shelby MO- Including the cities of Bowling Green, Columbia, Fulton, Hannibal, Jefferson City, Mexico, Mount Sterling, Pittsfield, and Quincy 232 PM CDT Wed Apr 14 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 8 AM CDT THURSDAY... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Portions of central and northeast Missouri as well as west central Illinois. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Byrd
3 follow-up statements
583 WWUS73 KLSX 142301 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 601 PM CDT Wed Apr 14 2021 MOZ059-060-062-072-073-151100- /O.EXA.KLSX.FR.Y.0002.210415T0600Z-210415T1300Z/ Crawford MO-Franklin MO-Gasconade MO-Warren MO-Washington MO- Including the cities of Sullivan, Union, and Washington 601 PM CDT Wed Apr 14 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 8 AM CDT THURSDAY... * WHAT...Temperatures as low as 35 will result in frost formation. * WHERE...Gasconade MO, Warren MO, Franklin MO, Crawford MO and Washington MO Counties. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ ILZ058-095>098-MOZ018-019-026-027-034>036-041-042-047>052-151100- /O.CON.KLSX.FR.Y.0002.210415T0600Z-210415T1300Z/ Adams IL-Audrain MO-Boone MO-Brown IL-Calhoun IL-Callaway MO- Cole MO-Greene IL-Knox MO-Lewis MO-Lincoln MO-Marion MO- Moniteau MO-Monroe MO-Montgomery MO-Osage MO-Pike IL-Pike MO- Ralls MO-Shelby MO- Including the cities of Bowling Green, Columbia, Fulton, Hannibal, Jefferson City, Mexico, Mount Sterling, Pittsfield, and Quincy 601 PM CDT Wed Apr 14 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 8 AM CDT THURSDAY... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Portions of central and northeast Missouri as well as west central Illinois. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Glass
771 WWUS73 KLSX 150844 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 344 AM CDT Thu Apr 15 2021 ILZ058-095>098-MOZ018-019-026-027-034>036-041-042-047>052-059-060- 062-072-073-151300- /O.CON.KLSX.FR.Y.0002.000000T0000Z-210415T1300Z/ Adams IL-Audrain MO-Boone MO-Brown IL-Calhoun IL-Callaway MO- Cole MO-Crawford MO-Franklin MO-Gasconade MO-Greene IL-Knox MO- Lewis MO-Lincoln MO-Marion MO-Moniteau MO-Monroe MO-Montgomery MO- Osage MO-Pike IL-Pike MO-Ralls MO-Shelby MO-Warren MO- Washington MO- Including the cities of Bowling Green, Columbia, Fulton, Hannibal, Jefferson City, Mexico, Mount Sterling, Pittsfield, Quincy, Sullivan, Union, and Washington 344 AM CDT Thu Apr 15 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING... * WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Portions of central and eastern Missouri as well as west central Illinois. * WHEN...Until 8 AM CDT this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ GKS
227 WWUS73 KLSX 151255 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 755 AM CDT Thu Apr 15 2021 ILZ058-095>098-MOZ018-019-026-027-034>036-041-042-047>052-059-060- 062-072-073-151400- /O.EXP.KLSX.FR.Y.0002.000000T0000Z-210415T1300Z/ Adams IL-Audrain MO-Boone MO-Brown IL-Calhoun IL-Callaway MO- Cole MO-Crawford MO-Franklin MO-Gasconade MO-Greene IL-Knox MO- Lewis MO-Lincoln MO-Marion MO-Moniteau MO-Monroe MO-Montgomery MO- Osage MO-Pike IL-Pike MO-Ralls MO-Shelby MO-Warren MO- Washington MO- Including the cities of Bowling Green, Columbia, Fulton, Hannibal, Jefferson City, Mexico, Mount Sterling, Pittsfield, Quincy, Sullivan, Union, and Washington 755 AM CDT Thu Apr 15 2021 ...FROST ADVISORY WILL EXPIRE AT 8 AM CDT THIS MORNING... Temperatures have warmed up to near 40 degrees across the advisory area. $$ Byrd
Nearby
Frost Advisories in Missouri, 2021Frost Advisories in Illinois, 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.