Alert archive / Minnesota / Flash Flood Warnings in 2011

Flash Flood Warning 9, NWS Twin Cities, MN

July 19, 2011Mille Lacs County, Morrison County, Minnesota

NWS Twin Cities, MN issued this flash flood warning at Jul 19, 2011, 9:01 AM CDT for Mille Lacs County, Morrison County, Minnesota. It was in force for 5 hr. 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 19, 2011, 9:01 AM CDT (14:01 UTC)
Expired
Jul 19, 2011, 2:00 PM CDT
In force
5 hr
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Flood severity
None

Counties Mille Lacs County, MN, Morrison County, MN

The radar

The Minneapolis radar (KMPX), 132 km from the middle of the area, began a volume at 14:04 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 12:00Z, 2.0 hours before the alert went out and 131 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 2011-07-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5144 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 2011-07-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 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
5144 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
830 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
109 m²/s²
Significant tornado parameter
0.9
Supercell composite
5.2

Open this sounding in Storm Lab

The text

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

862 
WGUS53 KMPX 191401
FFWMPX
MNC095-097-191900-
/O.NEW.KMPX.FF.W.0009.110719T1401Z-110719T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
901 AM CDT TUE JUL 19 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN MORRISON COUNTY IN CENTRAL MINNESOTA...
  MILLE LACS COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 200 PM CDT

* AT 855 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE      
  WARNED AREA. RAINFALL AMOUNTS OF 3.5 INCHES HAVE ALREADY OCCURRED  
  IN NORTHERN MORRISON COUNTY NEAR HARDING.  

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  LITTLE FALLS...BAYVIEW...BUCKMAN...GENOLA...HARDING...HILLMAN...   
  ISLE...LASTRUP...ONAMIA...PIERZ...VINELAND AND WAHKON.  

  SPECIFIC RIVERS AND CREEKS INCLUDE FLETCHER CREEK...PLATTE RIVER   
  THE SKUNK RIVER AND HILLMAN CREEK...IN NORTHERN AND EASTER         
  MORRISON COUNTY AND TIBBETTS BROOK AND THE RUM RIVER IN MILLE LACS 
  COUNTY.  

RAINFALL RATES OF 1.5 TO 2 INCHES AN HOUR WILL CONTINUE INTO MILLE 
LACS COUNTY THIS MORNING.  FLOODING IS LIKELY TO DEVELOP HERE 
THROUGH THE MORNING. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4625 9343 4600 9345 4598 9353 4574 9352
      4580 9376 4582 9377 4582 9384 4595 9437
      4616 9436 4616 9383 4618 9381 4624 9380

$$
DWE
--CTA_MARKER_NO--!

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 19, 6:20 AM CDTSpecial Weather StatementMPXTodd40 min
Jul 19, 6:48 AM CDTSevere Thunderstorm WarningMPXTodd57 min
Jul 19, 7:43 AM CDTSpecial Weather StatementMPXMorrison77 min
Jul 19, 7:46 AM CDTSpecial Weather StatementMPXTodd29 min
Jul 19, 8:19 AM CDTAreal Flood AdvisoryMPXMorrison3 hr
Jul 19, 8:26 AM CDTSpecial Weather StatementMPXKanabec, Mille Lacs79 min
Jul 19, 8:35 AM CDTSevere Thunderstorm WarningMPXMille Lacs, Morrison55 min
Jul 19, 8:53 AM CDTSevere Thunderstorm WarningMPXBenton, Mille Lacs, Morrison82 min
Jul 19, 9:30 AM CDTSevere Thunderstorm WarningMPXKanabec, Mille Lacs, Morrison42 min
Jul 19, 9:45 AM CDTSevere Thunderstorm WarningMPXBenton, Isanti, Kanabec, Mille Lacs, Sherburne60 min
Jul 19, 10:09 AM CDTSevere Thunderstorm WarningMPXAnoka, Sherburne36 min
Jul 19, 10:40 AM CDTSevere Thunderstorm WarningMPXAnoka, Hennepin, Ramsey80 min
Jul 19, 11:11 AM CDTAreal Flood AdvisoryMPXAnoka, Dakota, Ramsey, Washington3 hr
Jul 19, 11:25 AM CDTSevere Thunderstorm WarningMPXDakota, Hennepin, Ramsey, Washington65 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.