Alert archive / Missouri / Flash Flood Warnings in 2015

Flash Flood Warning 6, NWS St. Louis, MO

April 8, 2015Jefferson County, Missouri

NWS St. Louis, MO issued this flash flood warning at Apr 8, 2015, 9:09 PM CDT for Jefferson County, Missouri. It was in force for 6 hr. 3 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: Apr 8, 2015, 9:09 PM CDT (02:09 UTC)
Expired: Apr 9, 2015, 3:00 AM CDT
In force: 6 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

County Jefferson County, MO

The radar

The St Louis radar (KLSX), 33 km from the middle of the area, began a volume at 02:12 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
Apr 8, 9:37 PM CDT	FLASH FLOOD	3 S Fenton, MO	ESTIMATED 3 FT OF STANDING WATER NORTHWEST OF THE INTERSECTION OF 21 AND 141.
Apr 8, 9:48 PM CDT	FLASH FLOOD	3 S Fenton, MO	REPORTS OF A WATER RESCUE NEAR SALNE RD AND ROMAINE CREEK RD. THIS IS NORTHWEST OF THE INTERSECECTION OF 141 AND 21.
Apr 8, 10:40 PM CDT	FLASH FLOOD	2 Ese Murphy, MO	SUGAR CREEK OUT OF ITS BANKS. 1-2 FEET OF FLOWING WATER OVER ROMAINE CREEK RD. RELAYED BY KTVI.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.2 hours before the alert went out and 253 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: 1216 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 955 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 324 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.5

Open this sounding in Storm Lab

The text

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

138 
WGUS53 KLSX 090209
FFWLSX
MOC099-090800-
/O.NEW.KLSX.FF.W.0006.150409T0209Z-150409T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
909 PM CDT WED APR 8 2015

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN JEFFERSON COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 300 AM CDT

* AT 909 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE 
  WARNED AREA. RADAR ESTIMATES THAT UP TO 2 INCHES OF RAIN HAS 
  FALLEN ACROSS NORTHERN SECTIONS OF JEFFERSON COUNTY SINCE 730 PM. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  ANTONIA...ARNOLD...BARNHART...BYRNES MILL...CEDAR HILL...
  HERCULANEUM...HIGH RIDGE...MURPHY...PEVELY...DITTMER AND HOUSE
  SPRINGS.

THIS WARNING INCLUDES GOV. DUNKLIN'S GRAVE HISTORIC SITE...MASTODON
HISTORIC SITE AND SANDY CREEK COVERED BRIDGE HISTORIC SITE.

THIS WARNING ALSO INCLUDES...
INTERSTATE 55 IN MISSOURI FROM EXIT 178 TO EXIT 191.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT ONLY TAKES A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 3848 9073 3845 9068 3846 9066 3849 9065
      3847 9062 3850 9059 3850 9041 3848 9042
      3846 9042 3846 9036 3845 9035 3837 9036
      3834 9038 3825 9037 3822 9077

$$

GLASS

2 follow-up statements

019 
WGUS73 KLSX 090425
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1125 PM CDT WED APR 8 2015

MOC099-090800-
/O.CON.KLSX.FF.W.0006.000000T0000Z-150409T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JEFFERSON MO-
1125 PM CDT WED APR 8 2015

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHERN JEFFERSON
COUNTY UNTIL 300 AM CDT...

AT 1120 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED 
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. 
LOCAL LAW ENFORCEMENT REPORTS THAT SUGAR CREEK AND ROMAINE CREEK 
ARE FLOODING ROMAINE CREEK ROAD AND SALINE ROAD. THE EMERGENCY 
MANAGER RELAYED THE LAW ENFORCEMENT REPORT. LOCAL MEDIA HAS ALSO 
BEEN ON SCENE WITH VIDEO OF WATER RUNNING OVER THE ROAD.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...
ANTONIA...ARNOLD...BARNHART...BYRNES MILL...CEDAR HILL...
HERCULANEUM...HIGH RIDGE...MURPHY...PEVELY...DITTMER AND HOUSE 
SPRINGS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT 
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT 
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

A FLASH FLOOD WARNING MEANS THAT FLASH FLOODING IS IMMINENT OR
OCCURRING. IF YOU ARE IN THE WARNING AREA...MOVE TO HIGHER GROUND
IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE
IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO
CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY SO THAT THEY
MAY TAKE APPROPRIATE ACTION TO CLOSE FLOODED ROADWAYS. THEY WILL
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN ST LOUIS.

&&

LAT...LON 3848 9073 3845 9068 3846 9066 3849 9065
      3847 9062 3850 9059 3850 9041 3848 9042
      3846 9042 3846 9036 3845 9035 3837 9036
      3834 9038 3825 9037 3822 9077

$$

MILLER

291 
WGUS73 KLSX 090800
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
300 AM CDT THU APR 9 2015

MOC099-090812-
/O.EXP.KLSX.FF.W.0006.000000T0000Z-150409T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JEFFERSON MO-
300 AM CDT THU APR 9 2015

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHERN JEFFERSON
COUNTY WILL BE ALLOWED TO EXPIRE AT 300 AM CDT...

A CHECK WITH THE JEFFERSON COUNTY SHERRIFF'S OFFICE INDICATES THAT 
THE FLOOD WATERS HAVE RECEEDED ANY ROADS CLOSED DUE TO FLOODING FROM 
EARLIER THIS EVENING ARE NOW OPEN.

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 3848 9073 3845 9068 3846 9066 3849 9065
      3847 9062 3850 9059 3850 9041 3848 9042
      3846 9042 3846 9036 3845 9035 3837 9036
      3834 9038 3825 9037 3822 9077

$$

MILLER

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 8, 8:02 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson	31 min
Apr 8, 9:04 PM CDT	Areal Flood Warning	LSX	Sainte Genevieve, Saint Francois	6 hr
Apr 9, 6:10 AM CDT	Areal Flood Advisory	LSX	Franklin, Jefferson, Lincoln, Saint Charles, Saint Louis, Warren and 1 more	4 hr
Apr 9, 11:45 AM CDT	River Flood Warning	LSX	Saint Charles	25 hr
Apr 9, 3:20 PM CDT	Severe Thunderstorm Warning	LSX	Boone	40 min
Apr 9, 3:54 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Monroe	42 min
Apr 9, 4:13 PM CDT	Tornado Warning	LSX	Audrain	32 min
Apr 9, 4:16 PM CDT	Severe Thunderstorm Warning	LSX	Lewis	29 min
Apr 9, 4:31 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Monroe, Pike, Ralls	29 min
Apr 9, 5:07 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Lincoln, Montgomery, Warren	38 min
Apr 9, 5:19 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Lincoln, Pike, Ralls	41 min
Apr 9, 5:42 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Warren	25 min
Apr 9, 5:49 PM CDT	Tornado Warning	LSX	Lincoln, Saint Charles	26 min
Apr 9, 6:04 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln	41 min
Apr 9, 6:12 PM CDT	River Flood Warning	LSX	Jefferson, Saint Louis	3 days
Apr 9, 6:17 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Jefferson, Saint Francois, Washington	58 min
Apr 9, 6:55 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	35 min

Nearby

Flash Flood Warnings in Missouri, 2015 Every flash flood warning in 2015

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.