Alert archive / Missouri / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 145, NWS St. Louis, MO

July 23, 20174 counties in Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 23, 2017, 1:37 AM CDT for 4 counties in Missouri. It was in force for 38 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
Jul 23, 2017, 1:37 AM CDT (06:37 UTC)
Expired
Jul 23, 2017, 2:15 AM CDT
In force
38 min
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Callaway County, MO, Gasconade County, MO, Montgomery County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 79 km from the middle of the area, began a volume at 06:38 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 23, 12:38 AM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 6.6 hours before the alert went out and 284 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, Springfield, MO at 00:00Z on 2017-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2714 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 2017-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -13 square meters per square second.1939Sfc1 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
2714 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
1672 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-13 m²/s²
0-3 km storm-relative helicity
55 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

535 
WUUS53 KLSX 230637
SVRLSX
MOC027-073-139-219-230715-
/O.NEW.KLSX.SV.W.0145.170723T0637Z-170723T0715Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service St Louis MO
137 AM CDT SUN JUL 23 2017

The National Weather Service in St Louis has issued a

* Severe Thunderstorm Warning for...
  Southern Montgomery County in east central Missouri...
  Northeastern Callaway County in central Missouri...
  Northwestern Warren County in east central Missouri...
  Northern Gasconade County in east central Missouri...

* Until 215 AM CDT.

* At 136 AM CDT, a severe thunderstorm was located 7 miles south of
  Williamsburg, moving east at 20 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...
  Montgomery City, Hermann, New Florence, Jonesburg, Big Spring,
  Williamsburg, Mineola, Gasconade, High Hill, Rhineland, Morrison,
  McKittrick, Portland, Danville, Americus, Reform and Steedman.

This includes Interstate 70 in Missouri between exits 161 and 183.
 
This also includes  Deutschheim Historic Site and Graham Cave State
Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3898 9177 3898 9125 3870 9133 3870 9137
      3863 9137 3867 9164 3870 9164 3871 9173
      3869 9175 3870 9182
TIME...MOT...LOC 0636Z 273DEG 16KT 3881 9170 

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

Carney

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 22, 9:42 PM CDTSpecial Weather StatementLSXSaint Louis48 min
Jul 22, 10:33 PM CDTSpecial Weather StatementLSXCity of Saint Louis42 min
Jul 22, 11:34 PM CDTSpecial Weather StatementLSXCity of Saint Louis41 min
Jul 23, 12:21 AM CDTSevere Thunderstorm WarningLSXBoone, Cole, Moniteau54 min
Jul 23, 12:54 AM CDTSevere Thunderstorm WarningLSXCallaway51 min
Jul 23, 1:08 AM CDTSevere Thunderstorm WarningLSXAudrain, Boone, Callaway, Monroe, Shelby52 min
Jul 23, 1:46 AM CDTSevere Thunderstorm WarningLSXFranklin, Saint Charles, Warren44 min
Jul 23, 1:49 AM CDTSevere Thunderstorm WarningLSXAudrain, Callaway, Monroe, Montgomery, Pike, Ralls41 min
Jul 23, 2:17 AM CDTSevere Thunderstorm WarningLSXLincoln, Pike, Saint Charles, Warren43 min
Jul 23, 2:38 AM CDTSevere Thunderstorm WarningLSXSaint Louis, City of Saint Louis52 min
Jul 23, 2:48 AM CDTSevere Thunderstorm WarningLSXLincoln, Pike, Saint Charles, Saint Louis42 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2017Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.