Alert archive / Nebraska / Severe Thunderstorm Watches in 2006
Severe Thunderstorm Watch 708
The Storm Prediction Center issued this severe thunderstorm watch at Aug 10, 2006, 10:30 PM CDT for 4 counties in Iowa; 27 counties in Nebraska; Union County, South Dakota. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 10, 2006, 10:30 PM CDT (03:30 UTC)
- Expired
- Aug 11, 2006, 4:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 32 counties
Monona County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Antelope County, NE, Blaine County, NE, Boone County, NE, Burt County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Garfield County, NE, Greeley County, NE, Howard County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Sherman County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, Union County, SD
The radar
The Sioux Falls radar (KFSD), 153 km from the middle of the area, began a volume at 03:32 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 5%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 12:01 AM CDT | Severe Thunderstorm Warning | OAX | Antelope, Knox | 59 min |
| Aug 11, 12:25 AM CDT | Severe Thunderstorm Warning | OAX | Cedar | 50 min |
| Aug 11, 1:00 AM CDT | Severe Thunderstorm Warning | OAX | Antelope | 45 min |
| Aug 11, 1:22 AM CDT | Severe Thunderstorm Warning | OAX | Pierce | 38 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 3.5 hours before the alert went out and 163 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
- 1714 J/kg
- Mixed-layer CIN
- -127 J/kg
- Mixed-layer LCL
- 1205 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- -21 m²/s²
- 0-3 km storm-relative helicity
- 6 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -1.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 110332
SEL8
SPC WW 110332
IAZ000-NEZ000-SDZ000-110900-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 708
NWS STORM PREDICTION CENTER NORMAN OK
1030 PM CDT THU AUG 10 2006
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN IOWA
NORTHERN AND CENTRAL NEBRASKA
FAR SOUTHEASTERN SOUTH DAKOTA
EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1030 PM
UNTIL 400 AM CDT.
HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50
STATUTE MILES EITHER SIDE OF A LINE FROM 30 MILES NORTHEAST OF
SIOUX CITY IOWA TO 30 MILES WEST NORTHWEST OF BROKEN BOW
NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW 707...
DISCUSSION...MCS WITH EMBEDDED SUSTAINED STORMS/WEAK SUPERCELLS
EXPECTED TO CONTINUE MAINLY SSE INTO REGION OF MODERATE TO STRONG
INSTABILITY OVER NEB DURING THE NEXT FEW HOURS. WHILE CIN WILL
INCREASE WITH TIME/INCREASING SWD EXTENT...GIVEN SYSTEM SUPPORT WITH
MODERATE NNW FLOW ALOFT/CONTINUED COLD POOL DEVELOPMENT...POTENTIAL
MAY PERSIST FOR ADDITIONAL WIND DAMAGE/HAIL.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION
VECTOR 33020.
...CORFIDISPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 7:07 PM CDT | Severe Thunderstorm Watch | SPC | Lyon | 6 hr |
| Aug 11, 2:07 AM CDT | Mesoscale Discussion | SPC | Monona, Plymouth, Woodbury | 53 min |
| Aug 10, 9:29 PM CDT | Mesoscale Discussion | SPC | Antelope, Blaine, Boone, Boyd, Brown, Cedar and 25 more | 91 min |
| Aug 11, 2:18 PM CDT | Mesoscale Discussion | SPC | Box Butte, Cherry, Dawes, Sheridan | 117 min |
| Aug 11, 2:46 PM CDT | Severe Thunderstorm Watch | SPC | Cherry, Sheridan | 8 hr |
| Aug 11, 5:20 PM CDT | Mesoscale Discussion | SPC | Boyd, Keya Paha | 85 min |
Nearby
Severe Thunderstorm Watches in Nebraska, 2006Severe Thunderstorm Watches in Iowa, 2006Severe Thunderstorm Watches in South Dakota, 2006Every severe thunderstorm watch in 2006
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.