Alert archive / Missouri / Freeze Watches in 2012

Freeze Watch 1, NWS St. Louis, MO

April 9, 201228 counties in Missouri; 17 counties in Illinois

NWS St. Louis, MO issued this freeze watch at Apr 9, 2012, 3:10 PM CDT for 28 counties in Missouri; 17 counties in Illinois. It took effect at Apr 11, 2012, 3:00 AM CDT. It was in force for .

The area

The counties it named.

The facts

Issued: Apr 9, 2012, 3:10 PM CDT (20:10 UTC)
In effect from: Apr 11, 2012, 3:00 AM CDT
Expired: Apr 10, 2012, 2:45 AM CDT
In force
Issued by: NWS St. Louis, MO

All 45 counties

Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Madison County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shelby County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 19 km from the middle of the area, began a volume at 20:16 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 12:00Z, 8.2 hours before the alert went out and 242 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2520 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: -111 m²/s²
0-3 km storm-relative helicity: 13 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

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

NWS St. Louis, MO wrote its last area forecast discussion before this freeze watch went out at Apr 9, 2:55 PM CDT, 15 minutes earlier.

Area forecast discussion, Apr 9, 2:55 PM CDT, 15 minutes before

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Hazardous weather outlook, Apr 9, 3:37 AM CDT, 11 hours 33 minutes before

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Nearby

Freeze Watches in Missouri, 2012 Freeze Watches in Illinois, 2012 Every freeze watch in 2012

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.