Alert archive / Missouri / Special Weather Statements in 2017

Special Weather Statement, NWS St. Louis, MO

July 13, 2017Madison County, Missouri

NWS St. Louis, MO issued this special weather statement at Jul 13, 2017, 8:21 PM CDT for Madison County, Missouri. It was in force for 39 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 13, 2017, 8:21 PM CDT (01:21 UTC)
Expired
Jul 13, 2017, 9:00 PM CDT
In force
39 min
Issued by
NWS St. Louis, MO

County Madison County, MO

The radar

The St Louis radar (KLSX), 126 km from the middle of the area, began a volume at 01:22 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

Little Rock, AR (KBYH), launched 00:00Z, 1.4 hours before the alert went out and 311 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, Little Rock, AR at 00:00Z on 2017-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1476 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, Little Rock, AR at 00:00Z on 2017-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -10 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
1476 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
1327 m above ground
0-6 km bulk shear
3 kt
0-1 km storm-relative helicity
-10 m²/s²
0-3 km storm-relative helicity
26 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

635 
WWUS83 KLSX 140121
SPSLSX

Special Weather Statement
National Weather Service St Louis MO
821 PM CDT THU JUL 13 2017
 
MOZ074-075-085-140200-
Madison MO-St. Francois MO-Ste. Genevieve MO-
821 PM CDT THU JUL 13 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL STE. GENEVIEVE...
NORTHERN MADISON AND SOUTHEASTERN ST. FRANCOIS COUNTIES IN
SOUTHEASTERN MISSOURI UNTIL 900 PM CDT...

At 820 PM CDT, Doppler radar was tracking a strong thunderstorm near
Knob Lick, moving southeast at 15 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Fredericktown, Junction City, Cobalt, Marquand, Womac, Roselle, Knob
Lick, Mine La Motte, Libertyville and Catherine Place.

LAT...LON 3760 9054 3761 9052 3774 9037 3771 9008
      3764 9015 3755 9014 3741 9014
TIME...MOT...LOC 0120Z 296DEG 14KT 3763 9034 

$$

Tilly

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 8:11 PM CDTSpecial Weather StatementLSXMoniteau49 min
Jul 13, 8:50 PM CDTFlash Flood WarningLSXMadison, Sainte Genevieve, Saint Francois6 hr
Jul 13, 11:16 PM CDTFlash Flood WarningLSXIron, Madison, Reynolds6 hr

Nearby

Special Weather Statements in Missouri, 2017Every special weather statement 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.