Alert archive / Missouri / Frost Advisories in 2021
Frost Advisory 1, NWS St. Louis, MO
NWS St. Louis, MO issued this frost advisory at Apr 2, 2021, 2:44 PM CDT for 7 counties in Missouri; Randolph County, Illinois. It took effect at Apr 3, 2021, 2:00 AM CDT. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Apr 2, 2021, 2:44 PM CDT (19:44 UTC)
- In effect from
- Apr 3, 2021, 2:00 AM CDT
- Expired
- Apr 3, 2021, 8:20 AM CDT
- In force
- 6 hr
- Issued by
- NWS St. Louis, MO
Counties Randolph County, IL, Crawford County, MO, Iron County, MO, Madison County, MO, Reynolds County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 105 km from the middle of the area, began a volume at 19:46 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
Springfield, MO (KSGF), launched 12:00Z, 7.7 hours before the alert went out and 300 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
- 2603 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 128 m²/s²
- 0-3 km storm-relative helicity
- 181 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
441 WWUS73 KLSX 021944 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 244 PM CDT Fri Apr 2 2021 ILZ079-MOZ072>075-084-085-099-030745- /O.NEW.KLSX.FR.Y.0001.210403T0700Z-210403T1400Z/ Crawford MO-Iron MO-Madison MO-Randolph IL-Reynolds MO- Saint Francois MO-Sainte Genevieve MO-Washington MO- Including the cities of Chester, Farmington, and Sparta 244 PM CDT Fri Apr 2 2021 ...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM CDT SATURDAY... * WHAT...Temperatures as low as 34 will result in frost formation, particularly in wind protected areas. * WHERE...In Missouri, Crawford MO, Washington MO, Saint Francois MO, Sainte Genevieve MO, Iron MO, Madison MO and Reynolds MO Counties. In Illinois, Randolph IL County. * WHEN...From 2 AM to 9 AM CDT Saturday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ 19
2 follow-up statements
047 WWUS73 KLSX 030830 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 330 AM CDT Sat Apr 3 2021 ILZ079-MOZ072>075-084-085-099-031400- /O.CON.KLSX.FR.Y.0001.000000T0000Z-210403T1400Z/ Crawford MO-Iron MO-Madison MO-Randolph IL-Reynolds MO- Saint Francois MO-Sainte Genevieve MO-Washington MO- Including the cities of Chester, Farmington, and Sparta 330 AM CDT Sat Apr 3 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation, particularly in wind protected areas. * WHERE...In Missouri, Crawford MO, Washington MO, Saint Francois MO, Sainte Genevieve MO, Iron MO, Madison MO and Reynolds MO Counties. In Illinois, Randolph IL County. * WHEN...Until 9 AM CDT this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ GKS
788 WWUS73 KLSX 031320 NPWLSX URGENT - WEATHER MESSAGE National Weather Service Saint Louis MO 820 AM CDT Sat Apr 3 2021 ILZ079-MOZ072>075-084-085-099-031430- /O.CAN.KLSX.FR.Y.0001.000000T0000Z-210403T1400Z/ Crawford MO-Iron MO-Madison MO-Randolph IL-Reynolds MO- Saint Francois MO-Sainte Genevieve MO-Washington MO- Including the cities of Chester, Farmington, and Sparta 820 AM CDT Sat Apr 3 2021 ...FROST ADVISORY IS CANCELLED... Temperatures have warmed up into the low 40s across the advisory area. $$ Gosselin
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.