Alert archive / Missouri / Frost Advisories in 2018
Frost Advisory 2, NWS St. Louis, MO
NWS St. Louis, MO issued this frost advisory at Apr 19, 2018, 2:46 AM CDT for 9 counties in Illinois; 21 counties in Missouri. It took effect at Apr 20, 2018, 1:00 AM CDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Apr 19, 2018, 2:46 AM CDT (07:46 UTC)
- In effect from
- Apr 20, 2018, 1:00 AM CDT
- Expired
- Apr 20, 2018, 9:00 AM CDT
- In force
- 8 hr
- Issued by
- NWS St. Louis, MO
All 30 counties
Bond County, IL, Calhoun County, IL, Clinton County, IL, Jersey County, IL, Madison County, IL, Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Moniteau County, MO, Montgomery County, MO, Osage County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 30 km from the middle of the area, began a volume at 07:49 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 00:00Z, 7.8 hours before the alert went out and 267 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 783 m above ground
- 0-6 km bulk shear
- 75 kt
- 0-1 km storm-relative helicity
- -74 m²/s²
- 0-3 km storm-relative helicity
- 45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
181 WWUS73 KLSX 190746 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 246 AM CDT Thu Apr 19 2018 ILZ065-070-192115- /O.NEW.KLSX.FZ.W.0007.180420T0600Z-180420T1400Z/ Fayette IL-Marion IL- Including the cities of Centralia, Salem, and Vandalia 246 AM CDT Thu Apr 19 2018 ...FREEZE WARNING IN EFFECT FROM 1 AM TO 9 AM CDT FRIDAY... The National Weather Service in Saint Louis has issued a Freeze Warning, which is in effect from 1 AM to 9 AM CDT Friday. * TIMING...Late tonight and early Friday morning. * TEMPERATURES...Low temperatures will be 30 to 32 degrees. * IMPACTS...Sensitive plants and trees may be damaged or killed. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. && $$ ILZ064-069-074-079-098>102-MOZ041-047>052-059>065-072>075-084-085- 099-192115- /O.NEW.KLSX.FR.Y.0002.180420T0600Z-180420T1400Z/ Bond IL-Boone MO-Calhoun IL-Callaway MO-Clinton IL-Cole MO- Crawford MO-Franklin MO-Gasconade MO-Iron MO-Jefferson MO- Jersey IL-Lincoln MO-Madison IL-Madison MO-Moniteau MO-Monroe IL- Montgomery MO-Osage MO-Randolph IL-Reynolds MO-Saint Charles MO- Saint Clair IL-Saint Francois MO-Saint Louis City MO- Saint Louis MO-Sainte Genevieve MO-Warren MO-Washington IL- Washington MO- Including the cities of Alton, Belleville, Cahokia, Chester, Columbia, Edwardsville, Farmington, Fulton, Jefferson City, Saint Charles, Saint Louis, Sparta, Sullivan, Union, and Washington 246 AM CDT Thu Apr 19 2018 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 9 AM CDT FRIDAY... The National Weather Service in Saint Louis has issued a Frost Advisory, which is in effect from 1 AM to 9 AM CDT Friday. * TIMING...Late tonight and early Friday morning. * TEMPERATURES...Low temperatures will be in the lower to mid 30s. * IMPACTS...Sensitive plants and trees may be damaged or killed. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Frost Advisory means that widespread frost is expected. Those with agricultural interests in the Advisory area should protect tender vegetation. Also, potted plants normally left outdoors should be covered or brought inside away from the cold. && $$ Britt
3 follow-up statements
666 WWUS73 KLSX 192018 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 318 PM CDT Thu Apr 19 2018 ILZ065-070-200900- /O.CON.KLSX.FZ.W.0007.180420T0600Z-180420T1400Z/ Fayette IL-Marion IL- Including the cities of Centralia, Salem, and Vandalia 318 PM CDT Thu Apr 19 2018 ...FREEZE WARNING REMAINS IN EFFECT FROM 1 AM TO 9 AM CDT FRIDAY... * TIMING...Late tonight and early Friday morning. * TEMPERATURES...Dropping to around 30 degrees. * IMPACTS...Sensitive plants and trees may be damaged or killed. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. && $$ ILZ064-069-074-079-098>102-MOZ041-047>052-059>065-072>075-084-085- 099-200900- /O.CON.KLSX.FR.Y.0002.180420T0600Z-180420T1400Z/ Bond IL-Boone MO-Calhoun IL-Callaway MO-Clinton IL-Cole MO- Crawford MO-Franklin MO-Gasconade MO-Iron MO-Jefferson MO- Jersey IL-Lincoln MO-Madison IL-Madison MO-Moniteau MO-Monroe IL- Montgomery MO-Osage MO-Randolph IL-Reynolds MO-Saint Charles MO- Saint Clair IL-Saint Francois MO-Saint Louis City MO- Saint Louis MO-Sainte Genevieve MO-Warren MO-Washington IL- Washington MO- Including the cities of Alton, Belleville, Cahokia, Chester, Columbia, Edwardsville, Farmington, Fulton, Jefferson City, Saint Charles, Saint Louis, Sparta, Sullivan, Union, and Washington 318 PM CDT Thu Apr 19 2018 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 9 AM CDT FRIDAY... * TIMING...Late tonight and early Friday morning. * TEMPERATURES...Dropping to 32 to 35 degrees. * IMPACTS...Sensitive plants and trees may be damaged or killed. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Frost Advisory means that widespread frost is expected. Those with agricultural interests in the Advisory area should protect tender vegetation. Also, potted plants normally left outdoors should be covered or brought inside away from the cold. && $$ GKS
629 WWUS73 KLSX 200904 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 404 AM CDT Fri Apr 20 2018 ILZ065-070-201400- /O.CON.KLSX.FZ.W.0007.000000T0000Z-180420T1400Z/ Fayette IL-Marion IL- Including the cities of Centralia, Salem, and Vandalia 404 AM CDT Fri Apr 20 2018 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING... * TIMING...Early this morning. * TEMPERATURES...In the lower 30s. * IMPACTS...Sensitive plants and trees may be damaged or killed. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Freeze Warning means sub-freezing temperatures are imminent or highly likely. These conditions will kill crops and other sensitive vegetation. && $$ ILZ064-069-074-079-098>102-MOZ041-047>052-059>065-072>075-084-085- 099-201400- /O.CON.KLSX.FR.Y.0002.000000T0000Z-180420T1400Z/ Bond IL-Boone MO-Calhoun IL-Callaway MO-Clinton IL-Cole MO- Crawford MO-Franklin MO-Gasconade MO-Iron MO-Jefferson MO- Jersey IL-Lincoln MO-Madison IL-Madison MO-Moniteau MO-Monroe IL- Montgomery MO-Osage MO-Randolph IL-Reynolds MO-Saint Charles MO- Saint Clair IL-Saint Francois MO-Saint Louis City MO- Saint Louis MO-Sainte Genevieve MO-Warren MO-Washington IL- Washington MO- Including the cities of Alton, Belleville, Cahokia, Chester, Columbia, Edwardsville, Farmington, Fulton, Jefferson City, Saint Charles, Saint Louis, Sparta, Sullivan, Union, and Washington 404 AM CDT Fri Apr 20 2018 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING... * TIMING...Early this morning. * TEMPERATURES...In the mid 30s. * IMPACTS...Sensitive plants and trees may be damaged or killed. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Frost Advisory means that widespread frost is expected. Those with agricultural interests in the Advisory area should protect tender vegetation. Also, potted plants normally left outdoors should be covered or brought inside away from the cold. && $$ Maples
784 WWUS73 KLSX 201411 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 911 AM CDT Fri Apr 20 2018 ILZ065-070-201515- /O.EXP.KLSX.FZ.W.0007.000000T0000Z-180420T1400Z/ Fayette IL-Marion IL- Including the cities of Centralia, Salem, and Vandalia 911 AM CDT Fri Apr 20 2018 ...FREEZE WARNING HAS EXPIRED... Temperatures have risen above the freezing mark this morning. $$ ILZ064-069-074-079-098>102-MOZ041-047>052-059>065-072>075-084-085- 099-201515- /O.EXP.KLSX.FR.Y.0002.000000T0000Z-180420T1400Z/ Bond IL-Boone MO-Calhoun IL-Callaway MO-Clinton IL-Cole MO- Crawford MO-Franklin MO-Gasconade MO-Iron MO-Jefferson MO- Jersey IL-Lincoln MO-Madison IL-Madison MO-Moniteau MO-Monroe IL- Montgomery MO-Osage MO-Randolph IL-Reynolds MO-Saint Charles MO- Saint Clair IL-Saint Francois MO-Saint Louis City MO- Saint Louis MO-Sainte Genevieve MO-Warren MO-Washington IL- Washington MO- Including the cities of Alton, Belleville, Cahokia, Chester, Columbia, Edwardsville, Farmington, Fulton, Jefferson City, Saint Charles, Saint Louis, Sparta, Sullivan, Union, and Washington 911 AM CDT Fri Apr 20 2018 ...FROST ADVISORY HAS EXPIRED... Temperatures have risen well above the freezing mark this morning and frost has melted or evaporated. $$ GKS
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 2:46 AM CDT | Freeze Warning | LSX | Fayette, Marion | 30 hr |
Nearby
Frost Advisories in Missouri, 2018Frost Advisories in Illinois, 2018Every frost advisory 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.