Alert archive / Iowa / Frost Advisories in 2021
Frost Advisory 2, NWS Quad Cities, IA
NWS Quad Cities, IA issued this frost advisory at Apr 14, 2021, 2:45 PM CDT for 8 counties in Iowa; 5 counties in Illinois; Clark County, Scotland County, Missouri. 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, 2:45 PM CDT (19:45 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 Quad Cities, IA
Counties Des Moines County, IA, Henry County, IA, Jefferson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Van Buren County, IA, Washington County, IA, Hancock County, IL, Henderson County, IL, McDonough County, IL, Mercer County, IL, Warren County, IL, Clark County, MO, Scotland County, MO
The radar
The Quad Cities radar (KDVN), 109 km from the middle of the area, began a volume at 19:43 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, 7.8 hours before the alert went out and 115 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
- 1502 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
371 WWUS73 KDVN 141945 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 245 PM CDT Wed Apr 14 2021 IAZ076>078-087>089-098-099-ILZ024>026-034-035-MOZ009-010-150345- /O.NEW.KDVN.FR.Y.0002.210415T0600Z-210415T1300Z/ Keokuk-Washington-Louisa-Jefferson-Henry IA-Des Moines-Van Buren- Lee-Mercer-Henderson-Warren-Hancock-McDonough-Scotland-Clark- Including the cities of Sigourney, Washington, Wapello, Fairfield, Mount Pleasant, Burlington, Keosauqua, Fort Madison, Aledo, Oquawka, Monmouth, Carthage, Macomb, Memphis, and Kahoka 245 PM CDT Wed Apr 14 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 8 AM CDT THURSDAY... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Portions of northeast Missouri, southeast Iowa and northwest and 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. && $$ www.weather.gov/dvn
4 follow-up statements
575 WWUS73 KDVN 150146 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 846 PM CDT Wed Apr 14 2021 IAZ076>078-087>089-098-099-ILZ024>026-034-035-MOZ009-010-151000- /O.CON.KDVN.FR.Y.0002.210415T0600Z-210415T1300Z/ Keokuk-Washington-Louisa-Jefferson-Henry IA-Des Moines-Van Buren- Lee-Mercer-Henderson-Warren-Hancock-McDonough-Scotland-Clark- Including the cities of Sigourney, Washington, Wapello, Fairfield, Mount Pleasant, Burlington, Keosauqua, Fort Madison, Aledo, Oquawka, Monmouth, Carthage, Macomb, Memphis, and Kahoka 846 PM CDT Wed Apr 14 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 8 AM CDT THURSDAY... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Portions of northeast Missouri, southeast Iowa and northwest and west central Illinois. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
110 WWUS73 KDVN 150813 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 313 AM CDT Thu Apr 15 2021 IAZ076>078-087>089-098-099-ILZ024>026-034-035-MOZ009-010-151300- /O.CON.KDVN.FR.Y.0002.000000T0000Z-210415T1300Z/ Keokuk-Washington-Louisa-Jefferson-Henry IA-Des Moines-Van Buren- Lee-Mercer-Henderson-Warren-Hancock-McDonough-Scotland-Clark- Including the cities of Sigourney, Washington, Wapello, Fairfield, Mount Pleasant, Burlington, Keosauqua, Fort Madison, Aledo, Oquawka, Monmouth, Carthage, Macomb, Memphis, and Kahoka 313 AM CDT Thu Apr 15 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Portions of northeast Missouri, southeast Iowa and northwest and 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. && $$ www.weather.gov/dvn
217 WWUS73 KDVN 150815 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 315 AM CDT Thu Apr 15 2021 IAZ076>078-087>089-098-099-ILZ024>026-034-035-MOZ009-010-151300- /O.CON.KDVN.FR.Y.0002.000000T0000Z-210415T1300Z/ Keokuk-Washington-Louisa-Jefferson-Henry IA-Des Moines-Van Buren- Lee-Mercer-Henderson-Warren-Hancock-McDonough-Scotland-Clark- Including the cities of Sigourney, Washington, Wapello, Fairfield, Mount Pleasant, Burlington, Keosauqua, Fort Madison, Aledo, Oquawka, Monmouth, Carthage, Macomb, Memphis, and Kahoka 315 AM CDT Thu Apr 15 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Portions of northeast Missouri, southeast Iowa and northwest and west central Illinois. * WHEN...Through 8 AM CDT this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ www.weather.gov/dvn
145 WWUS73 KDVN 151310 NPWDVN URGENT - WEATHER MESSAGE National Weather Service Quad Cities IA IL 810 AM CDT Thu Apr 15 2021 IAZ076>078-087>089-098-099-ILZ024>026-034-035-MOZ009-010-151415- /O.EXP.KDVN.FR.Y.0002.000000T0000Z-210415T1300Z/ Keokuk-Washington-Louisa-Jefferson-Henry IA-Des Moines-Van Buren- Lee-Mercer-Henderson-Warren-Hancock-McDonough-Scotland-Clark- Including the cities of Sigourney, Washington, Wapello, Fairfield, Mount Pleasant, Burlington, Keosauqua, Fort Madison, Aledo, Oquawka, Monmouth, Carthage, Macomb, Memphis, and Kahoka 810 AM CDT Thu Apr 15 2021 ...FROST ADVISORY HAS EXPIRED... Temperatures have warmed and the threat for frost has diminished. $$ www.weather.gov/dvn
Nearby
Frost Advisories in Iowa, 2021Frost Advisories in Illinois, 2021Frost Advisories in Missouri, 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.