Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 25, NWS St. Louis, MO

March 2, 2012Franklin County, Gasconade County, Osage County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Mar 2, 2012, 4:37 AM CST for Franklin County, Gasconade County, Osage County, Missouri. It was in force for 38 min. 4 reports 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: Mar 2, 2012, 4:37 AM CST (10:37 UTC)
Expired: Mar 2, 2012, 5:15 AM CST
In force: 38 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.75 in
Wind: 50.0 mph

Counties Franklin County, MO, Gasconade County, MO, Osage County, MO

The radar

The St Louis radar (KLSX), 85 km from the middle of the area, began a volume at 10:40 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
Mar 2, 4:47 AM CST	HAIL 0.7	5 Se Linn, MO	DECK COVERED IN HAIL.
Mar 2, 5:02 AM CST	HAIL 1	5 Ne Drake, MO
Mar 2, 5:10 AM CST	HAIL 1	3 S New Haven, MO
Mar 2, 5:11 AM CST	HAIL 0.7	8 S New Haven, MO

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
Mar 2, 2:07 AM CST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 10.6 hours before the alert went out and 256 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3164 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 241 m²/s²
0-3 km storm-relative helicity: 396 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

315 
WUUS53 KLSX 021037
SVRLSX
MOC071-073-151-021115-
/O.NEW.KLSX.SV.W.0025.120302T1037Z-120302T1115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
437 AM CST FRI MAR 2 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  GASCONADE COUNTY IN EAST CENTRAL MISSOURI...
  SOUTHERN OSAGE COUNTY IN CENTRAL MISSOURI...

* UNTIL 515 AM CST

* AT 432 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR RICH FOUNTAIN...OR 9 MILES SOUTH OF LINN...
  AND MOVING NORTHEAST AT 60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  OWENSVILLE...NEW HAVEN...BLAND...MOUNT STERLING...DRAKE...
  ROSEBUD...GERALD...BEAUFORT...CANAAN...BAY...SWISS...LESLIE...NOSER
  MILL AND LYON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 3844 9204 3862 9122 3860 9114 3832 9102
      3823 9165 3828 9165 3828 9195
TIME...MOT...LOC 1037Z 251DEG 51KT 3838 9178
WIND...HAIL <50MPH 1.75IN

$$

KANOFSKY

1 follow-up statement

936 
WWUS53 KLSX 021052
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
452 AM CST FRI MAR 2 2012

MOC151-021102-
/O.CAN.KLSX.SV.W.0025.000000T0000Z-120302T1115Z/
OSAGE MO-
452 AM CST FRI MAR 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN OSAGE COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 3853 9164 3862 9122 3860 9114 3832 9102
      3823 9165
TIME...MOT...LOC 1052Z 251DEG 51KT 3845 9152

$$

MOC071-073-021115-
/O.CON.KLSX.SV.W.0025.000000T0000Z-120302T1115Z/
FRANKLIN MO-GASCONADE MO-
452 AM CST FRI MAR 2 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR GASCONADE AND
WESTERN FRANKLIN COUNTIES UNTIL 515 AM CST...

AT 449 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL.  THIS
STORM WAS LOCATED NEAR MOUNT STERLING...OR 7 MILES NORTHWEST OF
OWENSVILLE...MOVING EAST AT 60 MPH.

LOCATIONS IMPACTED INCLUDE...
  NEW HAVEN...DRAKE...ROSEBUD...GERALD...BEAUFORT...BAY...SWISS...
  LESLIE...NOSER MILL AND LYON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 3853 9164 3862 9122 3860 9114 3832 9102
      3823 9165
TIME...MOT...LOC 1052Z 251DEG 51KT 3845 9152
WIND...HAIL <50MPH 1.75IN

$$

KANOFSKY

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 2, 3:34 AM CST	Severe Thunderstorm Warning	LSX	Callaway, Cole, Moniteau, Osage	41 min
Mar 2, 3:59 AM CST	Severe Thunderstorm Warning	LSX	Cole, Osage	46 min
Mar 2, 4:08 AM CST	Severe Thunderstorm Warning	LSX	Callaway, Cole, Franklin, Gasconade, Montgomery, Osage and 1 more	37 min
Mar 2, 4:41 AM CST	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Lincoln, Montgomery, Warren	49 min
Mar 2, 5:10 AM CST	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Warren	39 min
Mar 2, 5:13 AM CST	Severe Thunderstorm Warning	LSX	Franklin, Saint Charles, Saint Louis, Warren	47 min
Mar 2, 5:56 AM CST	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Saint Louis, City of Saint Louis	49 min
Mar 2, 5:59 AM CST	Severe Thunderstorm Warning	LSX	Callaway	28 min
Mar 2, 6:36 AM CST	Severe Thunderstorm Warning	LSX	Lincoln, Montgomery, Pike	39 min
Mar 2, 7:07 AM CST	Severe Thunderstorm Warning	LSX	Lincoln, Pike	30 min
Mar 2, 1:59 PM CST	Wind Advisory	LSX	Crawford, Franklin, Gasconade, Iron, Jefferson, Lincoln and 10 more	4 hr

Nearby

Severe Thunderstorm Warnings in Missouri, 2012 Every 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.