Alert archive / Missouri / Frost Advisories in 2009

Frost Advisory 3, NWS Kansas City, MO

April 10, 200916 counties in Missouri; 5 counties in Kansas

NWS Kansas City, MO issued this frost advisory at Apr 10, 2009, 3:43 AM CDT for 16 counties in Missouri; 5 counties in Kansas. It took effect at Apr 11, 2009, 3:00 AM CDT. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued: Apr 10, 2009, 3:43 AM CDT (08:43 UTC)
In effect from: Apr 11, 2009, 3:00 AM CDT
Expired: Apr 11, 2009, 8:00 AM CDT
In force: 5 hr
Issued by: NWS Kansas City, MO

All 21 counties

Johnson County, KS, Leavenworth County, KS, Linn County, KS, Miami County, KS, Wyandotte County, KS, Bates County, MO, Carroll County, MO, Cass County, MO, Chariton County, MO, Clay County, MO, Cooper County, MO, Henry County, MO, Howard County, MO, Jackson County, MO, Johnson County, MO, Lafayette County, MO, Pettis County, MO, Platte County, MO, Randolph County, MO, Ray County, MO, Saline County, MO

The radar

The Pleasant Hill radar (KEAX), 33 km from the middle of the area, began a volume at 08:44 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 00:00Z, 8.7 hours before the alert went out and 230 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 124 J/kg
Mixed-layer CIN: -201 J/kg
Mixed-layer LCL: 561 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 440 m²/s²
0-3 km storm-relative helicity: 474 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this frost advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Kansas City, MO wrote its last area forecast discussion before this frost advisory went out at Apr 10, 3:22 AM CDT, 21 minutes earlier.

Area forecast discussion, Apr 10, 3:22 AM CDT, 21 minutes before

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The office that day

Everything else NWS Kansas City, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 10, 7:43 AM CDT	River Flood Warning	EAX	Carroll	33 hr
Apr 10, 6:28 PM CDT	River Flood Warning	EAX	Johnson, Pettis	4 hr

Nearby

Frost Advisories in Missouri, 2009 Frost Advisories in Kansas, 2009 Every frost advisory in 2009

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.