Alert archive / Missouri / Winter Storm Watches in 2010
Winter Storm Watch 4, NWS St. Louis, MO
NWS St. Louis, MO issued this winter storm watch at Feb 20, 2010, 4:09 AM CST for 5 counties in Missouri; Adams County, Brown County, Illinois. It took effect at Feb 21, 2010, 12:00 AM CST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Feb 20, 2010, 4:09 AM CST (10:09 UTC)
- In effect from
- Feb 21, 2010, 12:00 AM CST
- Expired
- Feb 20, 2010, 3:51 PM CST
- In force
- Issued by
- NWS St. Louis, MO
Counties Adams County, IL, Brown County, IL, Knox County, MO, Lewis County, MO, Marion County, MO, Monroe County, MO, Shelby County, MO
The radar
The St Louis radar (KLSX), 157 km from the middle of the area, began a volume at 10:07 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
Topeka, KS (KTOP), launched 00:00Z, 10.2 hours before the alert went out and 357 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
- 588 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter storm 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 winter storm watch went out at Feb 20, 3:34 AM CST, 35 minutes earlier.
Area forecast discussion, Feb 20, 3:34 AM CST, 35 minutes before
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Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 20, 3:51 PM CST | Winter Storm Warning | LSX | Knox, Lewis, Marion, Shelby | 32 hr |
| Feb 20, 3:51 PM CST | Winter Weather Advisory | LSX | Monroe, Pike, Ralls | 32 hr |
Nearby
Winter Storm Watches in Missouri, 2010Winter Storm Watches in Illinois, 2010Every winter storm watch in 2010
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.