Alert archive / South Dakota / Flash Flood Watches in 2011
Flash Flood Watch 5, NWS Aberdeen, SD
NWS Aberdeen, SD issued this flash flood watch at Jul 4, 2011, 4:20 AM CDT for 8 counties in South Dakota. It took effect at Jul 4, 2011, 7:00 PM CDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Jul 4, 2011, 4:20 AM CDT (09:20 UTC)
- In effect from
- Jul 4, 2011, 7:00 PM CDT
- Expired
- Jul 5, 2011, 3:55 AM CDT
- In force
- 9 hr
- Issued by
- NWS Aberdeen, SD
- Flood severity
- None
Counties Buffalo County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Lyman County, SD, Stanley County, SD, Sully County, SD
The radar
The Aberdeen radar (KABR), 172 km from the middle of the area, began a volume at 09:26 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
Aberdeen, SD (KABR), launched 00:00Z, 9.3 hours before the alert went out and 134 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
- 672 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 1514 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 41 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Aberdeen, SD wrote its last area forecast discussion before this flash flood watch went out at Jul 3, 9:07 PM CDT, 7 hours 13 minutes earlier.
Area forecast discussion, Jul 3, 9:07 PM CDT, 7 hours 13 minutes before
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Flash Flood Watches in South Dakota, 2011Every flash flood watch in 2011
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.