Alert archive / Missouri / Flash Flood Warnings in 1998

Flash Flood Warning 36, NWS St. Louis, MO

July 30, 1998Franklin County, Missouri

NWS St. Louis, MO issued this flash flood warning at Jul 30, 1998, 10:19 AM CDT for Franklin County, Missouri. It was in force for 8 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 30, 1998, 10:19 AM CDT (15:19 UTC)
Expired
Jul 30, 1998, 6:20 PM CDT
In force
8 hr
Issued by
NWS St. Louis, MO
Area
Whole counties

County Franklin County, MO

The radar

The St Louis radar (KLSX), 47 km from the middle of the area, began a volume at 15:20 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

Lincoln, IL (KILX), launched 12:00Z, 3.3 hours before the alert went out and 288 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, Lincoln, IL at 12:00Z on 1998-07-30Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 1998-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -38 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
1493 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
-38 m²/s²
0-3 km storm-relative helicity
82 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.

000 
TTAA00 KSTL 301520
FFWSTL
MOC071-302320-

BULLETIN - EAS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1019 AM CDT THU JUL 30 1998

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLOOD WARNING FOR...
  FRANKLIN COUNTY IN EAST CENTRAL MISSOURI

* UNTIL 620 PM CDT

* ...FLASH FLOOD WARNING CHANGED TO FLOOD WARNING FOR FRANKLIN CO...

* AT 1015 AM THE BULK OF THE HEAVY THUNDERSTORMS WERE JUST EXITING
  FRANKLIN COUNTY. RAIN WILL TAPER OFF QUICKLY THIS MORNING TO
  SCATTERED SHOWERS...BUT RUNOFF FROM VERY HEAVY RAINFALL WILL
  CONTINUE FOR THE NEXT SEVERAL HOURS INTO TRIBUTARIES...CREEKS...
  LOW LYING AREAS...AND RIVERS THROUGHOUT THE COUNTY

  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER ATTEMPT TO
  CROSS BRIDGES...DIPS...OR LOW-WATER CROSSINGS IF WATER COVERS THE
  ROAD. DO NOT DRIVE AROUND BARRICADES. IF YOUR VEHICLE STALLS
  ABANDON IT IMMEDIATELY AND SEEK HIGHER GROUND. RAPIDLY RISING
  WATER MAY SWEEP THE VEHICLE AND ITS OCCUPANTS AWAY.

  PEDIGO/GLASS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 6:19 AM CDTFlash Flood WarningLSXFranklin4 hr
Jul 30, 10:00 AM CDTFlash Flood WarningLSXSaint Louis, City of Saint Louis3 hr
Jul 30, 10:00 AM CDTFlash Flood WarningLSXJefferson3 hr
Jul 30, 4:17 PM CDTSevere Thunderstorm WarningLSXReynolds48 min

Nearby

Flash Flood Warnings in Missouri, 1998Every flash flood warning in 1998

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.