Alert archive / Wisconsin / Flash Flood Warnings in 2015

Flash Flood Warning 3, NWS Twin Cities, MN

July 6, 2015Washington County, Minnesota; Pierce County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this flash flood warning at Jul 6, 2015, 3:13 AM CDT for Washington County, Minnesota; Pierce County, Saint Croix County, Wisconsin. It was in force for 2 hr. 4 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
Jul 6, 2015, 3:13 AM CDT (08:13 UTC)
Expired
Jul 6, 2015, 5:15 AM CDT
In force
2 hr
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Flood severity
None

Counties Washington County, MN, Pierce County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 54 km from the middle of the area, began a volume at 08:17 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
Jul 6, 4:30 AM CDTFLASH FLOOD3 Nw River Falls, WIREPORT OF A CUL-DE-SAC FLOODED OFF OF TOWNSVALLEY ROAD.
Jul 6, 4:50 AM CDTFLASH FLOODWoodbury, MNRESIDENT REPORTED RISING WATER APPROACHING THEIR HOME.
Jul 6, 5:00 AM CDTHEAVY RAIN 5.36River Falls, WI
Jul 6, 5:10 AM CDTHEAVY RAIN 3.42 Ene Grey Cloud Townsh, 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 00:00Z, 8.2 hours before the alert went out and 56 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 00:00Z on 2015-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1489 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, Minneapolis, MN at 00:00Z on 2015-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 115 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
1489 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
1240 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
115 m²/s²
0-3 km storm-relative helicity
253 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.0

Open this sounding in Storm Lab

The text

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

749 
WGUS53 KMPX 060813
FFWMPX
MNC163-WIC093-109-061015-
/O.NEW.KMPX.FF.W.0003.150706T0813Z-150706T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
313 AM CDT MON JUL 6 2015

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN WASHINGTON COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHWESTERN PIERCE COUNTY IN WEST CENTRAL WISCONSIN...
  SOUTHWESTERN ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN...

* UNTIL 515 AM CDT
    
* AT 310 AM CDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING 
  HEAVY RAIN ACROSS THE WARNED AREA. 2 TO 4 INCHES OF RAIN HAS 
  FALLEN...WITH ANOTHER ROUND OF HEAVY RAIN MOVING INTO THE AREA 
  THAT WILL LIKELY PRODUCE ANOTHER 1 TO 2 INCHES.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  RIVER FALLS...WOODBURY...COTTAGE GROVE...INVER GROVE HEIGHTS...
  OAKDALE...HASTINGS...SOUTH ST. PAUL...HUDSON...LAKE ELMO...ST. PAUL
  PARK...PRESCOTT AND AFTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4475 9285 4477 9288 4478 9294 4477 9297
      4478 9302 4481 9301 4488 9302 4489 9298
      4496 9297 4498 9257 4474 9257

$$

ADL

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 5, 7:30 PM CDTSevere Thunderstorm WarningMPXPope, Stevens45 min
Jul 5, 8:41 PM CDTSpecial Weather StatementMPXStevens2 hr
Jul 5, 8:54 PM CDTFlash Flood WatchMPXAnoka, Benton, Blue Earth, Brown, Carver, Chippewa and 29 more16 hr
Jul 5, 9:11 PM CDTSpecial Weather StatementMPXTodd64 min
Jul 5, 9:38 PM CDTSpecial Weather StatementMPXSwift67 min
Jul 5, 10:15 PM CDTSpecial Weather StatementMPXChippewa, Lac qui Parle75 min
Jul 5, 11:03 PM CDTSevere Thunderstorm WarningMPXBenton, Sherburne, Stearns42 min
Jul 5, 11:28 PM CDTFlash Flood WarningMPXBenton, Sherburne, Stearns3 hr
Jul 5, 11:48 PM CDTSpecial Weather StatementMPXChippewa, Yellow Medicine117 min
Jul 6, 2:14 AM CDTSpecial Weather StatementMPXRamsey, Washington2 hr
Jul 6, 2:40 AM CDTSpecial Weather StatementMPXBrown, Nicollet20 min
Jul 6, 5:31 AM CDTSpecial Weather StatementMPXEau Claire104 min
Jul 6, 5:35 AM CDTFlash Flood WarningMPXPierce, Saint Croix5 hr
Jul 6, 5:45 AM CDTFlash Flood WarningMPXChippewa, Dunn, Eau Claire3 hr
Jul 6, 8:50 AM CDTAreal Flood WarningMPXChippewa, Dunn, Eau Claire3 hr

Nearby

Flash Flood Warnings in Wisconsin, 2015Flash Flood Warnings in Minnesota, 2015Every 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.