Alert archive / Iowa / Frost Advisories in 2012
Frost Advisory 2, NWS Des Moines, IA
NWS Des Moines, IA issued this frost advisory at Apr 7, 2012, 3:41 PM CDT for 17 counties in Iowa. It took effect at Apr 8, 2012, 4:00 AM CDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Apr 7, 2012, 3:41 PM CDT (20:41 UTC)
- In effect from
- Apr 8, 2012, 4:00 AM CDT
- Expired
- Apr 8, 2012, 3:51 AM CDT
- In force
- Issued by
- NWS Des Moines, IA
Counties Adair County, IA, Adams County, IA, Audubon County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Crawford County, IA, Emmet County, IA, Greene County, IA, Guthrie County, IA, Humboldt County, IA, Kossuth County, IA, Palo Alto County, IA, Pocahontas County, IA, Sac County, IA, Taylor County, IA, Webster County, IA
The radar
The Des Moines radar (KDMX), 90 km from the middle of the area, began a volume at 20:40 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
Omaha, NE (KOAX), launched 12:00Z, 8.7 hours before the alert went out and 168 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
- 502 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 137 m²/s²
- 0-3 km storm-relative helicity
- 232 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
344 WWUS73 KDMX 072041 NPWDMX URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE DES MOINES IA 341 PM CDT SAT APR 7 2012 .LIGHT WINDS...CLEAR SKIES AND A DRY AIRMASS WILL ALLOW TEMPERATURES TO DROP NEAR THE FREEZING MARK OVERNIGHT. THIS IS FORECAST TO PRODUCE AREAS OF FROST DURING THE EARLY MORNING HOURS OF SUNDAY. IAZ004-005-015-023-024-033>035-044>046-057-058-070-071-081-092- 080400- /O.NEW.KDMX.FR.Y.0002.120408T0900Z-120408T1300Z/ EMMET-KOSSUTH-PALO ALTO-POCAHONTAS-HUMBOLDT-SAC-CALHOUN-WEBSTER- CRAWFORD-CARROLL-GREENE-AUDUBON-GUTHRIE-CASS-ADAIR-ADAMS-TAYLOR- INCLUDING THE CITIES OF...ESTHERVILLE...ALGONA...EMMETSBURG... POCAHONTAS...HUMBOLDT...SAC CITY...ROCKWELL CITY...FORT DODGE... DENISON...CARROLL...JEFFERSON...AUDUBON...GUTHRIE CENTER... ATLANTIC...GREENFIELD...CORNING...BEDFORD 341 PM CDT SAT APR 7 2012 ...FROST ADVISORY IN EFFECT FROM 4 AM TO 8 AM CDT SUNDAY... THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FROST ADVISORY...WHICH IS IN EFFECT FROM 4 AM TO 8 AM CDT SUNDAY. * TEMPERATURE...READINGS ARE FORECAST TO DROP FROM 32 TO 35 DEGREES DURING THE EARLY MORNING HOURS. THE COLDEST READINGS WILL BE IN RIVER VALLEYS SUCH AS THE NISHNABOTNA VALLEYS AND OTHER LOW LYING AREAS. * IMPACTS...SENSITIVE VEGETATION MAY BE IMPACTED BY THE FROST... PLEASE TAKE PRECAUTIONS TO PROTECT ANY OUTDOOR PLANTS THAT MAY BE AFFECTED. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR PLANTS MAY BE KILLED IF LEFT UNCOVERED. && $$ CC
2 follow-up statements
691 WWUS73 KDMX 080145 NPWDMX URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE DES MOINES IA 845 PM CDT SAT APR 7 2012 .LIGHT WINDS...CLEAR SKIES AND A DRY AIR MASS WILL ALLOW TEMPERATURES TO DROP NEAR FREEZING OVERNIGHT. THIS IS FORECAST TO PRODUCE AREAS OF FROST DURING THE EARLY MORNING HOURS OF SUNDAY. IAZ004-005-015-023-024-033>035-044>046-057-058-070-071-081-092- 080945- /O.CON.KDMX.FR.Y.0002.120408T0900Z-120408T1300Z/ EMMET-KOSSUTH-PALO ALTO-POCAHONTAS-HUMBOLDT-SAC-CALHOUN-WEBSTER- CRAWFORD-CARROLL-GREENE-AUDUBON-GUTHRIE-CASS-ADAIR-ADAMS-TAYLOR- INCLUDING THE CITIES OF...ESTHERVILLE...ALGONA...EMMETSBURG... POCAHONTAS...HUMBOLDT...SAC CITY...ROCKWELL CITY...FORT DODGE... DENISON...CARROLL...JEFFERSON...AUDUBON...GUTHRIE CENTER... ATLANTIC...GREENFIELD...CORNING...BEDFORD 845 PM CDT SAT APR 7 2012 ...FROST ADVISORY REMAINS IN EFFECT FROM 4 AM TO 8 AM CDT SUNDAY... * TEMPERATURE...READINGS ARE FORECAST TO DROP INTO THE LOWER 30S OVERNIGHT WITH THE COLDEST READINGS WILL BE IN RIVER VALLEYS SUCH AS THE NISHNABOTNA VALLEYS AND OTHER LOW LYING AREAS. * IMPACTS...SENSITIVE VEGETATION MAY BE IMPACTED BY THE FROST... PLEASE TAKE PRECAUTIONS TO PROTECT ANY OUTDOOR PLANTS THAT MAY BE AFFECTED. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR PLANTS MAY BE KILLED IF LEFT UNCOVERED. && $$
660 WWUS73 KDMX 080851 NPWDMX URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE DES MOINES IA 351 AM CDT SUN APR 8 2012 .THE AIR MASS IN PLACE OVER IOWA IS SO DRY THAT FROST FAILED TO DEVELOP OVERNIGHT. DUE TO THE LACK OF WIDESPREAD FROST DEVELOPMENT THE ADVISORY WILL BE CANCELLED. HOWEVER...PATCHY FROST IS STILL A POSSIBILITY. IAZ004-005-015-023-024-033>035-044>046-057-058-070-071-081-092- 081000- /O.CAN.KDMX.FR.Y.0002.120408T0900Z-120408T1300Z/ EMMET-KOSSUTH-PALO ALTO-POCAHONTAS-HUMBOLDT-SAC-CALHOUN-WEBSTER- CRAWFORD-CARROLL-GREENE-AUDUBON-GUTHRIE-CASS-ADAIR-ADAMS-TAYLOR- INCLUDING THE CITIES OF...ESTHERVILLE...ALGONA...EMMETSBURG... POCAHONTAS...HUMBOLDT...SAC CITY...ROCKWELL CITY...FORT DODGE... DENISON...CARROLL...JEFFERSON...AUDUBON...GUTHRIE CENTER... ATLANTIC...GREENFIELD...CORNING...BEDFORD 351 AM CDT SUN APR 8 2012 ...FROST ADVISORY IS CANCELLED... THE NATIONAL WEATHER SERVICE IN DES MOINES HAS CANCELLED THE FROST ADVISORY. VERY DRY AIR IN PLACE OVER CENTRAL IOWA KEPT WIDESPREAD FROST FROM DEVELOPING. AS A RESULT THE ADVISORY WILL BE CANCELLED. $$ FAB
Nearby
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.