Alert archive / Minnesota / Flash Flood Warnings in 2011

Flash Flood Warning 3, NWS Twin Cities, MN

July 10, 2011Carver County, Hennepin County, Ramsey County, Minnesota

NWS Twin Cities, MN issued this flash flood warning at Jul 10, 2011, 6:08 AM CDT for Carver County, Hennepin County, Ramsey County, Minnesota. It was in force for 89 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 10, 2011, 6:08 AM CDT (11:08 UTC)
Expired
Jul 10, 2011, 7:37 AM CDT
In force
89 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Flood severity
None

Counties Carver County, MN, Hennepin County, MN, Ramsey County, MN

The radar

The Minneapolis radar (KMPX), 17 km from the middle of the area, began a volume at 11:08 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

Minneapolis, MN (KMPX), launched 00:00Z, 11.1 hours before the alert went out and 19 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 2011-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1607 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 2011-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 120 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
1607 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
1076 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
120 m²/s²
0-3 km storm-relative helicity
121 m²/s²
Significant tornado parameter
0.9
Supercell composite
7.3

Open this sounding in Storm Lab

The text

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

045 
WGUS53 KMPX 101108
FFWMPX
MNC019-053-123-101400-
/O.NEW.KMPX.FF.W.0003.110710T1108Z-110710T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
608 AM CDT SUN JUL 10 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 900 AM CDT

* AT 603 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAINFALL TRACKING ACROSS THE
  WARNED AREA. RAINFALL AMOUNTS OF NEAR 1 TO 1.5 INCHES IN AN HOUR 
  ARE LIKELY. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  TO OCCUR IN URBAN AREAS. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING 
  INCLUDE...MINNEAPOLIS...ST PAUL...ARDEN HILLS...BLOOMINGTON...CARVER...
  CHANHASSEN...CHASKA...COLOGNE...DEEPHAVEN...EDEN PRAIRIE...EDINA...
  EXCELSIOR....GOLDEN VALLEY...HOPKINS...LITTLE CANADA...MAPLEWOOD...MAYER
  MINNETONKA...MOUNDS VIEW...NEW BRIGHTON...NORTH OAKS...RICHFIELD...
  ROBBINSDALE...ROSEVILLE...SHOREVIEW...SHOREWOOD...ST BONIFACIUS AND
  ST LOUIS PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

LAT...LON 4471 9384 4488 9394 4496 9344 4506 9329
      4504 9328 4504 9323 4511 9321 4511 9301
      4493 9299 4491 9305 4492 9313 4486 9321
      4481 9334 4480 9354 4475 9362

$$
1 follow-up statement
290 
WGUS73 KMPX 101237
FFSMPX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
737 AM CDT SUN JUL 10 2011

MNC019-053-123-101247-
/O.CAN.KMPX.FF.W.0003.000000T0000Z-110710T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CARVER MN-HENNEPIN MN-RAMSEY MN-
737 AM CDT SUN JUL 10 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR RAMSEY...SOUTHERN
HENNEPIN AND CENTRAL CARVER COUNTIES IS CANCELLED...

FLOOD PRODUCING RAINS HAVE ENDED IN THE WARNED AREA AND ADDITIONAL 
SCATTERED SHOWERS AND THUNDERSTORMS APPEAR TO BE DEVELOPING OVER AREAS
TO THE NORTH...OVER EAST CENTRAL MINNESOTA. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF FLOODING WAS OBSERVED PLEASE RELAY YOUR REPORT TO LOCAL LAW
ENFORCEMENT OR TO THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES.

&&

LAT...LON 4471 9384 4488 9394 4496 9344 4506 9329
      4504 9328 4504 9323 4511 9321 4511 9301
      4493 9299 4491 9305 4492 9313 4486 9321
      4481 9334 4480 9354 4475 9362

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 10, 3:15 AM CDTSpecial Weather StatementMPXWatonwan60 min
Jul 10, 4:06 AM CDTSpecial Weather StatementMPXScott39 min
Jul 10, 4:22 AM CDTSevere Thunderstorm WarningMPXCarver, Dakota, Scott, Sibley68 min
Jul 10, 4:56 AM CDTAreal Flood AdvisoryMPXCarver, Dakota, Le Sueur, Rice, Scott, Sibley3 hr
Jul 10, 5:27 AM CDTSpecial Weather StatementMPXGoodhue63 min
Jul 10, 5:32 AM CDTSevere Thunderstorm WarningMPXDakota, Goodhue, Washington58 min
Jul 10, 6:34 PM CDTSpecial Weather StatementMPXDouglas, Kandiyohi, Pope, Stearns, Stevens, Swift and 1 more86 min
Jul 10, 6:44 PM CDTSevere Thunderstorm WarningMPXDouglas, Pope, Stevens61 min

Nearby

Flash Flood Warnings in Minnesota, 2011Every flash flood warning in 2011

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.