Alert archive / Missouri / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 79, NWS St. Louis, MO

March 23, 2012Pike County, Ralls County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Mar 23, 2012, 4:30 PM CDT for Pike County, Ralls County, Missouri. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Mar 23, 2012, 4:30 PM CDT (21:30 UTC)
Expired
Mar 23, 2012, 5:00 PM CDT
In force
30 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Pike County, MO, Ralls County, MO

The radar

The St Louis radar (KLSX), 106 km from the middle of the area, began a volume at 21:33 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.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.5 hours before the alert went out and 254 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-pSkew-T log-p diagram, Davenport, at 12:00Z on 2012-03-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2012-03-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -46 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
997 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
-46 m²/s²
0-3 km storm-relative helicity
59 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.

109 
WUUS53 KLSX 232130
SVRLSX
MOC163-173-232200-
/O.NEW.KLSX.SV.W.0079.120323T2130Z-120323T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
430 PM CDT FRI MAR 23 2012

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN PIKE COUNTY IN NORTHEAST MISSOURI...
  CENTRAL RALLS COUNTY IN NORTHEAST MISSOURI...

* UNTIL 500 PM CDT

* AT 429 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR SPENCERBURG...OR 9 MILES NORTHEAST OF
  VANDALIA...AND MOVING NORTH AT 5 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF CENTRAL RALLS AND NORTHWESTERN PIKE COUNTIES.

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 3950 9152 3954 9133 3937 9131 3935 9149
TIME...MOT...LOC 2130Z 170DEG 4KT 3942 9142
WIND...HAIL <50MPH 1.00IN

$$

CARNEY
1 follow-up statement
472 
WWUS53 KLSX 232151
SVSLSX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
451 PM CDT FRI MAR 23 2012

MOC163-173-232201-
/O.EXP.KLSX.SV.W.0079.000000T0000Z-120323T2200Z/
PIKE MO-RALLS MO-
451 PM CDT FRI MAR 23 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL RALLS AND NORTHWESTERN
PIKE COUNTIES IN NORTHEAST MISSOURI WILL EXPIRE AT 500 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER SMALL HAIL...GUSTY WINDS...DANGEROUS LIGHTNING...AND HEAVY 
RAIN ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 3950 9152 3954 9133 3937 9131 3935 9149
TIME...MOT...LOC 2151Z 170DEG 4KT 3944 9143

$$

CARNEY

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 23, 4:42 AM CDTSevere Thunderstorm WarningLSXSaint Francois, Washington33 min
Mar 23, 4:14 PM CDTSevere Thunderstorm WarningLSXLewis31 min
Mar 23, 5:01 PM CDTAreal Flood AdvisoryLSXLewis4 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.