Alert archive / Missouri / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 201, NWS St. Louis, MO

December 4, 2017Knox County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Dec 4, 2017, 4:07 PM CST for Knox County, Missouri. It was in force for 38 min. 2 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: Dec 4, 2017, 4:07 PM CST (22:07 UTC)
Expired: Dec 4, 2017, 4:45 PM CST
In force: 38 min
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Knox County, MO

The radar

The Quad Cities radar (KDVN), 203 km from the middle of the area, began a volume at 22:09 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
Dec 4, 4:29 PM CST	HAIL 1	5 N Hurdland, MO	HAIL WAS OBSERVED ALONG WITH GUSTY WINDS WEST/SOUTHWEST OF BARING. TIME ESTIMATED FROM RADAR.
Dec 4, 4:29 PM CST	HAIL 1	5 N Hurdland, MO	HAIL WAS OBSERVED ALONG WITH GUSTY WINDS WEST/SOUTHWEST OF BARING. TIME 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
Dec 4, 2:34 PM CST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.1 hours before the alert went out and 298 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: 1245 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 424 m²/s²
0-3 km storm-relative helicity: 408 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

536 
WUUS53 KLSX 042207
SVRLSX
MOC103-042245-
/O.NEW.KLSX.SV.W.0201.171204T2207Z-171204T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
407 PM CST MON DEC 4 2017

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Knox County in northeastern Missouri...

* Until 445 PM CST.

* At 407 PM CST, a severe thunderstorm was located near Kirksville,
  moving northeast at 50 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Edina, Knox City, Greensburg, Colony, Hurdland and Baring. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4030 9195 4007 9195 4004 9235 4030 9235
TIME...MOT...LOC 2207Z 246DEG 44KT 4013 9253 

HAIL...1.00IN
WIND...60MPH
 
$$

CVKING

3 follow-up statements

762 
WWUS53 KLSX 042216
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
416 PM CST MON DEC 4 2017

MOC103-042245-
/O.CON.KLSX.SV.W.0201.000000T0000Z-171204T2245Z/
Knox MO-
416 PM CST MON DEC 4 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CST
FOR NORTHERN KNOX COUNTY...

At 416 PM CST, a severe thunderstorm was located over Brashear,
moving northeast at 50 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Trained weather spotters reported 60 mph wind gusts 4 
         miles west of South Gifford in Macon County. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

Locations impacted include...
Edina, Knox City, Greensburg, Colony, Hurdland and Baring. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4030 9195 4015 9195 4008 9234 4030 9235
TIME...MOT...LOC 2216Z 246DEG 44KT 4018 9240 

HAIL...1.00IN
WIND...60MPH
 
$$

CVKING

032 
WWUS53 KLSX 042237
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
437 PM CST MON DEC 4 2017

MOC103-042245-
/O.CON.KLSX.SV.W.0201.000000T0000Z-171204T2245Z/
Knox MO-
437 PM CST MON DEC 4 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CST
FOR NORTHERN KNOX COUNTY...

At 437 PM CST, a severe thunderstorm was located near Greensburg,
moving northeast at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Trained weather spotters have reported 1 inch diameter 
         hail and 60 mph wind gusts with this thunderstorm. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

Locations impacted include...
Edina, Colony and Baring. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4030 9195 4023 9195 4016 9223 4024 9231
      4030 9221
TIME...MOT...LOC 2237Z 246DEG 32KT 4024 9220 

HAIL...1.00IN
WIND...60MPH
 
$$

CVKING

792 
WWUS53 KLSX 042244
SVSLSX

Severe Weather Statement
National Weather Service St Louis MO
444 PM CST MON DEC 4 2017

MOC103-042254-
/O.EXP.KLSX.SV.W.0201.000000T0000Z-171204T2245Z/
Knox MO-
444 PM CST MON DEC 4 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN KNOX COUNTY WILL
EXPIRE AT 445 PM CST...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.

A severe thunderstorm watch remains in effect until 900 PM CST for
northeastern Missouri.

LAT...LON 4030 9195 4023 9195 4016 9223 4024 9231
      4030 9221
TIME...MOT...LOC 2244Z 246DEG 44KT 4027 9211 

$$

CVKING

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 4, 5:02 PM CST	Severe Thunderstorm Warning	LSX	Audrain, Monroe	43 min
Dec 4, 5:14 PM CST	Special Weather Statement	LSX	Lewis	31 min
Dec 4, 5:23 PM CST	Severe Thunderstorm Warning	LSX	Cole, Moniteau	41 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2017 Every severe thunderstorm warning in 2017

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.