Alert archive / Minnesota / Flash Flood Warnings in 2014

Flash Flood Warning 18, NWS Twin Cities, MN

August 17, 2014Dakota County, Goodhue County, Minnesota

NWS Twin Cities, MN issued this flash flood warning at Aug 17, 2014, 6:53 PM CDT for Dakota County, Goodhue County, Minnesota. It was in force for 4 hr. 2 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
Aug 17, 2014, 6:53 PM CDT (23:53 UTC)
Expired
Aug 17, 2014, 11:00 PM CDT
In force
4 hr
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Flood severity
None

Counties Dakota County, MN, Goodhue County, MN

The radar

The Minneapolis radar (KMPX), 68 km from the middle of the area, began a volume at 23:56 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

TimeReportWhereRemark
Aug 17, 7:11 PM CDTFLASH FLOOD2 Ssw Miesville, MNMIESVILLE TRAIL WASHED OUT. REPORT GATHERED VIA TWITTER.
Aug 17, 8:12 PM CDTHEAVY RAIN 5Hampton, MN

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

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.9 hours before the alert went out and 71 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, Minneapolis, MN at 12:00Z on 2014-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 426 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, Minneapolis, MN at 12:00Z on 2014-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 61 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
426 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
545 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
61 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.

423 
WGUS53 KMPX 172353
FFWMPX
MNC037-049-180400-
/O.NEW.KMPX.FF.W.0018.140817T2353Z-140818T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
653 PM CDT SUN AUG 17 2014

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN GOODHUE COUNTY IN SOUTHEAST MINNESOTA...
  SOUTHERN DAKOTA COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 1100 PM CDT

* AT 647 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE   
  WARNED AREA. SINCE 3 PM...DOPPLER RADAR HAS INDICATED THAT 3 TO 
  5 INCHES OF RAIN HAS FALLEN FROM HAMPTON TOWARD WELCH. MORE HEAVY
  RAIN CONTINUES TO APPROACH THE WARNED AREA...WITH ANOTHER 1 TO 2 
  INCHES OF RAIN LIKELY THROUGH 8 PM.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...RED
  WING AND CANNON FALLS ALONG WITH RAVINES ALONG THE CANNON RIVER 
  FROM CANNON FALLS TO RED WING.

DAKOTA COUNTY HAS CLOSED ORLANDO AVENUE AND HAS ADVISED THE PARTS OF 
IT ARE BEGINNING TO WASH OUT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...NEVER DRIVE ACROSS FLOODED ROADWAYS...TURN AROUND...DON'T
DROWN.

&&

LAT...LON 4454 9315 4468 9295 4464 9261 4462 9263
      4461 9260 4459 9258 4445 9265

$$
2 follow-up statements
025 
WGUS73 KMPX 180209
FFSMPX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
909 PM CDT SUN AUG 17 2014

MNC037-049-180400-
/O.CON.KMPX.FF.W.0018.000000T0000Z-140818T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DAKOTA MN-GOODHUE MN-
909 PM CDT SUN AUG 17 2014

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHWESTERN GOODHUE AND
SOUTHERN DAKOTA COUNTIES UNTIL 1100 PM CDT...

AT 901 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED THAT 
FLOODING WAS OCCURRING SOUTH OF MIESVILLE...OR NORTHEAST OF CANNON 
FALLS. SOME INTERSECTIONS REMAIN UNDER WATER. GOODHUE COUNTY ROAD 20 
REMAINS CLOSED.

RAINFALL AMOUNTS OF OVER 6 INCHES HAVE BEEN REPORTED IN THE AREA.  
THE RAINFALL HAS MOSTLY SUBSIDED WITH ONLY MINOR ADDITIONAL 
AMOUNTS EXPECTED TONIGHT. HOWEVER...SOME ROADS IN THE AREA REMAIN 
FLOODED AT THIS TIME FROM THE EARLIER HEAVY RAIN AND THE WARNING 
WILL REMAIN IN EFFECT UNTIL THE FLOOD WATERS RECEDE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

LAT...LON 4454 9315 4468 9295 4464 9261 4462 9263
      4461 9260 4459 9258 4445 9265

$$

SPD
594 
WGUS73 KMPX 180358
FFSMPX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1058 PM CDT SUN AUG 17 2014

MNC037-049-180411-
/O.EXP.KMPX.FF.W.0018.000000T0000Z-140818T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DAKOTA MN-GOODHUE MN-
1058 PM CDT SUN AUG 17 2014

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHWESTERN
GOODHUE AND SOUTHERN DAKOTA COUNTIES WILL BE ALLOWED TO EXPIRE AT
1100 PM CDT...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN WERE BEGINNING TO RECEDE...ENDING THE FLOOD THREAT. A 
FEW ROADS WILL REMAIN CLOSED OVERNIGHT...SO DO NOT DRIVE AROUND 
BARRICADES. IF FLOODING HAS BEEN OBSERVED...PLEASE REPORT IT TO YOUR 
LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 4454 9315 4468 9295 4464 9261 4462 9263
      4461 9260 4459 9258 4445 9265

$$

JRB

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 17, 7:26 AM CDTSpecial Weather StatementMPXPope64 min
Aug 17, 9:27 AM CDTSpecial Weather StatementMPXChippewa3 hr
Aug 17, 5:01 PM CDTSpecial Weather StatementMPXHennepin59 min
Aug 17, 6:23 PM CDTSpecial Weather StatementMPXDakota112 min

Nearby

Flash Flood Warnings in Minnesota, 2014Every flash flood warning in 2014

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.