Alert archive / Minnesota / Flash Flood Warnings in 2007

Flash Flood Warning 15, NWS Twin Cities, MN

August 13, 2007Hennepin County, Minnesota

NWS Twin Cities, MN issued this flash flood warning at Aug 13, 2007, 10:46 PM CDT for Hennepin County, Minnesota. It was in force for 119 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 13, 2007, 10:46 PM CDT (03:46 UTC)
Expired
Aug 14, 2007, 12:45 AM CDT
In force
119 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Hennepin County, MN

The radar

The Minneapolis radar (KMPX), 19 km from the middle of the area, began a volume at 03:48 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 13, 11:26 PM CDTHEAVY RAIN 4Eden Prairie, MN3-4 INCHES OF STANDING WATER REPORTED AT ANDERSON LAKES PKWY.
Aug 13, 11:40 PM CDTHEAVY RAIN 24Bloomington, MN2 FEET OF STANDING WATER AT 91ST/92ND AND OLIVER AVE.
Aug 13, 11:46 PM CDTHEAVY RAIN 0Bloomington, MNAT INTERSECTION OF 494 AND PORTLAND AVE CARS STRANDED UNDER BRIDGE.

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, 3.8 hours before the alert went out and 20 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 2007-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2096 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 00:00Z on 2007-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 263 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
2096 J/kg
Mixed-layer CIN
-245 J/kg
Mixed-layer LCL
1133 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
263 m²/s²
0-3 km storm-relative helicity
409 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.0

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KMPX 140347
FFWMPX
MNC053-140545-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1046 PM CDT MON AUG 13 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 1245 AM CDT

* AT 1046 PM CDT...RADAR DETECTED THUNDERSTORMS PRODUCING VERY HEAVY
  RAIN ACROSS MUCH OF THE WARNED AREA. THE STORMS PRODUCING THE
  HEAVIEST RAIN WERE EXTENDING FROM 22 MILES NORTHWEST OF MINNEAPOLIS
  TO 27 MILES WEST OF MINNEAPOLIS. THESE STORMS WERE MOVING TO THE   
  SOUTHEAST AT 45 MPH. AS MUCH AS 2 INCHES OF RAIN IN LESS THAN AN   
  HOUR WILL BE POSSIBLE WITH THIS LINE OF STORMS.

* SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...BROOKLYN PARK...
  GOLDEN VALLEY...HOPKINS...MAPLE GROVE...MINNEAPOLIS...PLYMOUTH AND
  RICHFIELD.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IMMINENT.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT DRIVE YOUR VEHICLE
INTO AREAS WHERE THE WATER COVERS THE ROAD. JUST ONE FOOT OF RUSHING
WATER CAN SWEEP MOST VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

LAT...LON 4525 9351 4518 9363 4511 9372 4497 9377
      4491 9372 4489 9354 4483 9334 4486 9320
      4512 9331

$$
1 follow-up statement
000 
WGUS73 KMPX 140540
FFSMPX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1240 AM CDT TUE AUG 14 2007

MNC053-140546-
HENNEPIN MN-
1240 AM CDT TUE AUG 14 2007

...THE FLASH FLOOD WARNING FOR HENNEPIN COUNTY WILL BE ALLOWED TO
EXPIRE AT 1245 AM CDT. WHILE WATER LEVELS WERE RECEDING IN THE WARNED
AREA...MOTORISTS SHOULD REMAIN ALERT FOR STANDING WATER ON AREA 
ROADWAYS...INCLUDING AT THE  INTERSECTION OF 494 AND PORTLAND IN
BLOOMINGTON.


PLEASE REPORT ANY SEVERE WEATHER TO YOUR LOCAL LAW ENFORCEMENT OFFICE
AND TELL THEM TO RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE.

LAT...LON 4525 9351 4518 9363 4511 9372 4497 9377
      4491 9372 4489 9354 4483 9334 4486 9320
      4512 9331

$$

LS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 13, 7:44 PM CDTSevere Thunderstorm WarningMPXBenton, Mille Lacs61 min
Aug 13, 7:57 PM CDTSevere Thunderstorm WarningMPXMorrison18 min
Aug 13, 8:08 PM CDTSevere Thunderstorm WarningMPXKanabec52 min
Aug 13, 8:17 PM CDTSevere Thunderstorm WarningMPXIsanti, Sherburne58 min
Aug 13, 8:43 PM CDTSevere Thunderstorm WarningMPXAnoka, Chisago62 min
Aug 13, 8:47 PM CDTSevere Thunderstorm WarningMPXStearns, Todd58 min
Aug 13, 8:52 PM CDTTornado WarningMPXAnoka, Sherburne23 min
Aug 13, 9:15 PM CDTSevere Thunderstorm WarningMPXHennepin, Ramsey, Washington60 min
Aug 13, 9:45 PM CDTSevere Thunderstorm WarningMPXMeeker, Stearns, Wright60 min
Aug 13, 10:42 PM CDTSevere Thunderstorm WarningMPXHennepin, Wright63 min
Aug 13, 11:30 PM CDTSevere Thunderstorm WarningMPXWashington60 min
Aug 13, 11:37 PM CDTSevere Thunderstorm WarningMPXDakota, Goodhue53 min
Aug 13, 11:48 PM CDTFlash Flood WarningMPXDakota, Scott117 min
Aug 13, 11:51 PM CDTSevere Thunderstorm WarningMPXScott29 min
Aug 14, 12:26 AM CDTFlash Flood WarningMPXGoodhue2 hr
Aug 14, 12:29 AM CDTSevere Thunderstorm WarningMPXGoodhue48 min

Nearby

Flash Flood Warnings in Minnesota, 2007Every flash flood warning in 2007

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.