Alert archive / Missouri / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 196
The Storm Prediction Center issued this severe thunderstorm watch at Apr 27, 2012, 7:18 PM CDT for 6 counties in Kansas; 7 counties in Missouri. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Apr 27, 2012, 7:18 PM CDT (00:18 UTC)
- Expired
- Apr 27, 2012, 8:53 PM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 50 kt
Counties Atchison County, KS, Doniphan County, KS, Johnson County, KS, Leavenworth County, KS, Miami County, KS, Wyandotte County, KS, Bates County, MO, Buchanan County, MO, Cass County, MO, Clay County, MO, Clinton County, MO, Jackson County, MO, Platte County, MO
The radar
The Pleasant Hill radar (KEAX), 74 km from the middle of the area, began a volume at 00:21 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
- 10%
- 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
- 10%
- Six or more combined severe hail and wind reports
- 50%
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, 0.3 hours before the alert went out and 261 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
- 1176 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 596 m²/s²
- 0-3 km storm-relative helicity
- 669 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
212
WWUS20 KWNS 280021
SEL6
SPC WW 280021
KSZ000-MOZ000-280400-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 196
NWS STORM PREDICTION CENTER NORMAN OK
720 PM CDT FRI APR 27 2012
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHEAST KANSAS
WEST CENTRAL AND NORTHWEST MISSOURI
EFFECTIVE THIS FRIDAY EVENING FROM 720 PM UNTIL 1100 PM CDT.
HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 60
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 35
STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES NORTH
NORTHWEST OF SAINT JOSEPH MISSOURI TO 50 MILES SOUTH SOUTHEAST OF
OLATHE KANSAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).
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 194...WW 195...
DISCUSSION...ELEVATED SUSTAINED STORMS/SUPERCELLS POSING A RISK FOR
SVR HAIL WILL AFFECT THE LAWRENCE/KANSAS CITY/ST JOSEPH AREAS THIS
EVE AS NARROWING...ELEVATED TONGUE OF HIGH THETA-E AIR PIVOTS NE
ACROSS REGION ON SRN FRINGE OF EJECTING UPR IMPULSE IN SRN NEB.
DEAMPLIFICATION OF UPR DISTURBANCE...AND PERSISTENT WAA ATOP
SFC-BASED COOL DOME...SUGGEST THAT STORMS MAY PERSIST OVER WW AREA
INTO MID EVE.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 23035.
...CORFIDISPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 27, 7:00 PM CDT | Mesoscale Discussion | SPC | Atchison, Brown, Doniphan, Jefferson, Johnson, Leavenworth and 1 more | 30 min |
| Apr 28, 1:17 PM CDT | Mesoscale Discussion | SPC | Franklin, Gasconade, Jefferson, Lincoln, Montgomery, Osage and 7 more | 88 min |
| Apr 28, 1:48 PM CDT | Severe Thunderstorm Watch | SPC | Crawford, Franklin, Gasconade, Jefferson, Lincoln, Montgomery and 6 more | 7 hr |
| Apr 28, 2:56 PM CDT | Mesoscale Discussion | SPC | Saint Charles, Saint Louis, City of Saint Louis | 64 min |
| Apr 28, 5:15 PM CDT | Tornado Watch | SPC | Jefferson, Perry, Sainte Genevieve, Saint Francois, Washington | 5 hr |
| Apr 28, 5:59 PM CDT | Mesoscale Discussion | SPC | Franklin, Gasconade, Jefferson, Lincoln, Montgomery, Pike and 4 more | 2 hr |
| Apr 28, 6:12 PM CDT | Mesoscale Discussion | SPC | Jefferson | 2 hr |
Nearby
Severe Thunderstorm Watches in Missouri, 2012Severe Thunderstorm Watches in Kansas, 2012Every severe thunderstorm 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.