Alert archive / Missouri / Flash Flood Warnings in 1998

Flash Flood Warning 13, NWS St. Louis, MO

June 29, 1998Boone County, Missouri

NWS St. Louis, MO issued this flash flood warning at Jun 29, 1998, 10:31 PM CDT for Boone County, Missouri. It was in force for 3 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
Jun 29, 1998, 10:31 PM CDT (03:31 UTC)
Expired
Jun 30, 1998, 1:30 AM CDT
In force
3 hr
Issued by
NWS St. Louis, MO
Area
Whole counties

County Boone County, MO

The radar

The St Louis radar (KLSX), 145 km from the middle of the area, began a volume at 03:31 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

Springfield, MO (KSGF), launched 00:00Z, 3.5 hours before the alert went out and 267 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 1998-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1641 joules per kilogram.LCLLFCEL10008507005003002001001 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, Springfield, MO at 00:00Z on 1998-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 square meters per square second.193958Sfc1 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
1641 J/kg
Mixed-layer CIN
-80 J/kg
Mixed-layer LCL
1639 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
89 m²/s²
Significant tornado parameter
0.1
Supercell composite
4.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KSTL 300332
FFWSTL
MOC019-027-073-300630-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1031 PM CDT MON JUN 29 1998

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BOONE COUNTY IN CENTRAL MISSOURI
  CALLAWAY COUNTY IN CENTRAL MISSOURI
  GASCONADE COUNTY IN EASTERN MISSOURI

* UNTIL 130 AM CDT

* AN AREA OF STRONG THUNDERSTORMS EXTEND FROM EASTERN BOONE COUNTY
  THROUGH NORTHERN CALLAWAY INTO FAR NORTHERN GASCONADE COUNTIES IN
  CENTRAL MISSOURI.

* THESE STORMS HAVE PRODUCE RAINFALL AMOUNTS OF 1 TO 2 INCHES OVER
  PARTS OF FAR NORTHERN BOONE COUNTY. THE THUNDERSTORM COMPLEX WILL
  CONTINUE TO MOVE SOUTHEAST AND PRODUCE HEAVY RAINFALL OVER
  BOONE...CALLAWAY AND GASCONADE COUNTIES. MOTORISTS ARE ADVISED TO
  AVOID FLOWING WATER ACROSS ROADWAYS.

  BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
  DANGERS OF FLOODING. IT IS VERY DIFFICULT AT NnIGHT TO TELL HOW
  DEEP THE WATER MAY BE. MOTORISTS SHOULD NEVER DRIVE THROUGH WATER
  OF UNKNOWN DEPTH.

  RP


&

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 7:17 PM CDTTornado WarningLSXKnox48 min
Jun 29, 7:31 PM CDTSevere Thunderstorm WarningLSXMonroe49 min
Jun 29, 7:39 PM CDTTornado WarningLSXShelby46 min
Jun 29, 7:52 PM CDTTornado WarningLSXMonroe33 min
Jun 29, 8:06 PM CDTTornado WarningLSXAudrain49 min
Jun 29, 8:33 PM CDTSevere Thunderstorm WarningLSXMonroe47 min
Jun 29, 8:42 PM CDTTornado WarningLSXMontgomery48 min
Jun 29, 9:08 PM CDTTornado WarningLSXWarren47 min
Jun 29, 9:15 PM CDTFlash Flood WarningLSXMontgomery, Warren4 hr
Jun 29, 9:15 PM CDTFlash Flood WarningLSXAudrain, Monroe, Shelby4 hr
Jun 29, 10:01 PM CDTSevere Thunderstorm WarningLSXFranklin, Jefferson44 min
Jun 29, 10:31 PM CDTFlash Flood WarningLSXCallaway, Gasconade3 hr

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.