Alert archive / Missouri / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 89, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 15, 2012, 5:37 PM CDT for Callaway County, Montgomery County, Missouri. It was in force for 23 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Apr 15, 2012, 5:37 PM CDT (22:37 UTC)
- Expired
- Apr 15, 2012, 6:00 PM CDT
- In force
- 23 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Callaway County, MO, Montgomery County, MO
The radar
The St Louis radar (KLSX), 98 km from the middle of the area, began a volume at 22:39 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 15, 5:45 PM CDT | TSTM WND GST 50 | Steedman, MO | TRAINED SPOTTER IN STEEDMAN ESTIMATES WIND SPEEDS OF 50 MPH. REPORT ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 15, 4:42 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 10.6 hours before the alert went out and 278 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
- 31 J/kg
- Mixed-layer CIN
- -142 J/kg
- Mixed-layer LCL
- 855 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 319 m²/s²
- 0-3 km storm-relative helicity
- 381 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
199
WUUS53 KLSX 152237
SVRLSX
MOC027-139-152300-
/O.NEW.KLSX.SV.W.0089.120415T2237Z-120415T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
537 PM CDT SUN APR 15 2012
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CALLAWAY COUNTY IN CENTRAL MISSOURI...
MONTGOMERY COUNTY IN EAST CENTRAL MISSOURI...
* UNTIL 600 PM CDT
* AT 535 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 8 MILES NORTHWEST
OF CHAMOIS...AND MOVING NORTHEAST AT 80 MPH.
HAZARD...60 MPH WIND GUSTS.
SOURCE...RADAR INDICATED.
IMPACT...MINOR TREE DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER
BROKEN.
* LOCATIONS IMPACTED INCLUDE...
WILLIAMSBURG...SHAMROCK AND REFORM.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.
&&
LAT...LON 3906 9177 3906 9144 3868 9180 3866 9187
3864 9189 3872 9205
TIME...MOT...LOC 2238Z 213DEG 69KT 3877 9187
HAIL...<.75IN
WIND...60 MPH
$$
TRUETT2 follow-up statements
437
WWUS53 KLSX 152252
SVSLSX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
552 PM CDT SUN APR 15 2012
MOC027-139-152300-
/O.CON.KLSX.SV.W.0089.000000T0000Z-120415T2300Z/
CALLAWAY MO-MONTGOMERY MO-
552 PM CDT SUN APR 15 2012
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR MONTGOMERY AND
EASTERN CALLAWAY COUNTIES UNTIL 600 PM CDT...
AT 548 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 8 MILES NORTH OF
CHAMOIS...AND MOVING NORTHEAST AT 80 MPH.
HAZARD...60 MPH WIND GUSTS.
SOURCE...RADAR INDICATED...WITH SOME WEAKENING NOTED.
IMPACT...MINOR TREE DAMAGE...WITH LIMBS UP TO ONE INCH IN DIAMETER
BROKEN.
LOCATIONS IMPACTED INCLUDE...
WILLIAMSBURG AND SHAMROCK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT
IMMEDIATELY LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE
TO A PLACE OF SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT
OR SMALL INTERIOR ROOM.
&&
LAT...LON 3906 9177 3906 9144 3868 9180 3887 9193
TIME...MOT...LOC 2252Z 213DEG 69KT 3886 9171
HAIL...<.75IN
WIND...60 MPH
$$
TRUETT357 WWUS53 KLSX 152300 SVSLSX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 600 PM CDT SUN APR 15 2012 MOC027-139-152310- /O.EXP.KLSX.SV.W.0089.000000T0000Z-120415T2300Z/ CALLAWAY MO-MONTGOMERY MO- 600 PM CDT SUN APR 15 2012 ...THE SEVERE THUNDERSTORM WARNING FOR MONTGOMERY AND EASTERN CALLAWAY COUNTIES HAS EXPIRED... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY. ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO WATCH REMAINS IN EFFECT UNTIL 12 MIDNIGHT. LAT...LON 3906 9177 3906 9144 3868 9180 3887 9193 TIME...MOT...LOC 2252Z 213DEG 69KT 3886 9171 $$ TRUETT
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 14, 9:00 PM CDT | River Flood Warning | LSX | Franklin | 3 days |
| Apr 15, 3:50 AM CDT | Wind Advisory | LSX | Audrain, Boone, Callaway, Cole, Crawford, Franklin and 18 more | 17 hr |
| Apr 15, 4:24 PM CDT | Severe Thunderstorm Warning | LSX | Boone, Cole, Moniteau | 36 min |
| Apr 15, 6:47 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 28 min |
Nearby
Severe Thunderstorm Warnings in Missouri, 2012Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.