Alert archive / Nebraska / Tornado Watches in 2007
Tornado Watch 74
The Storm Prediction Center issued this tornado watch at Mar 24, 2007, 6:15 PM CDT for 4 counties in Kansas; 16 counties in Nebraska. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 24, 2007, 6:15 PM CDT (23:15 UTC)
- Expired
- Mar 25, 2007, 12:03 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
Counties Cheyenne County, KS, Decatur County, KS, Norton County, KS, Rawlins County, KS, Arthur County, NE, Chase County, NE, Custer County, NE, Dawson County, NE, Dundy County, NE, Frontier County, NE, Furnas County, NE, Gosper County, NE, Hayes County, NE, Hitchcock County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Red Willow County, NE
The radar
The North Platte radar (KLNX), 130 km from the middle of the area, began a volume at 23:17 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
- 30%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 24, 6:22 PM CDT | Tornado Warning | LBF | Hayes | 23 min |
| Mar 24, 6:24 PM CDT | Tornado Warning | LBF | Keith | 36 min |
| Mar 24, 6:44 PM CDT | Tornado Warning | LBF | Hayes | 46 min |
| Mar 24, 7:06 PM CDT | Severe Thunderstorm Warning | GLD | Red Willow | 24 min |
| Mar 24, 7:19 PM CDT | Severe Thunderstorm Warning | LBF | Frontier | 56 min |
| Mar 24, 7:30 PM CDT | Tornado Warning | LBF | Frontier | 45 min |
| Mar 24, 7:33 PM CDT | Severe Thunderstorm Warning | GID | Dawson | 57 min |
| Mar 24, 7:57 PM CDT | Severe Thunderstorm Warning | LBF | Lincoln | 31 min |
| Mar 24, 8:28 PM CDT | Severe Thunderstorm Warning | LBF | Custer | 62 min |
| Mar 24, 9:29 PM CDT | Severe Thunderstorm Warning | LBF | Custer, Garfield, Loup | 46 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.3 hours before the alert went out and 50 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
- 1024 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 79 m²/s²
- 0-3 km storm-relative helicity
- 116 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 242316
SEL4
SPC WW 242316
KSZ000-NEZ000-250500-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 74
NWS STORM PREDICTION CENTER NORMAN OK
515 PM MDT SAT MAR 24 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
NORTHWEST KANSAS
SOUTHWEST NEBRASKA
EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 515 PM UNTIL
1100 PM MDT.
TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 20 MILES WEST OF IMPERIAL
NEBRASKA TO 45 MILES SOUTH OF BROKEN BOW NEBRASKA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU4).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.
DISCUSSION...CLUSTER OF THUNDERSTORMS HAS DEVELOPED IN LEFT EXIT
REGION OF STRONG UPPER JET...IN REGION OF STRONG AMBIENT VORTICITY.
CLEARING SKIES ARE ALLOWING SOME LATE AFTERNOON
HEATING/DESTABILIZATION AND MAY HELP TO PROMOTE A FEW INTENSE
CONVECTIVE CORES. LOW-TOPPED SUPERCELLS WILL BE POSSIBLE WITH A
RISK OF HAIL AND ISOLATED TORNADOES.
AVIATION...TORNADOES AND 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 400.
MEAN STORM MOTION VECTOR 23030.
...HARTSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 23, 7:29 PM CDT | Mesoscale Discussion | SPC | Cheyenne | 2 hr |
| Mar 23, 8:09 PM CDT | Severe Thunderstorm Watch | SPC | Barton, Ellsworth, Harvey, Kingman, Lincoln, McPherson and 4 more | 4 hr |
| Mar 23, 8:19 PM CDT | Mesoscale Discussion | SPC | Barber, Barton, Clark, Comanche, Edwards, Finney and 14 more | 116 min |
| Mar 23, 11:04 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Ellis, Gove, Graham, Logan and 10 more | 2 hr |
| Mar 24, 2:14 AM CDT | Mesoscale Discussion | SPC | Jewell, Republic, Smith, Washington | 91 min |
| Mar 24, 5:42 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Graham, Norton, Phillips, Rawlins and 5 more | 93 min |
Nearby
Tornado Watches in Nebraska, 2007Tornado Watches in Kansas, 2007Every tornado watch in 2007
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.