Alert archive / Minnesota / Flash Flood Warnings in 2016

Flash Flood Warning 33, NWS Twin Cities, MN

September 21, 2016Anoka County, Hennepin County, Minnesota

NWS Twin Cities, MN issued this flash flood warning at Sep 21, 2016, 11:11 PM CDT for Anoka County, Hennepin County, Minnesota. It was in force for 5 hr. 1 report 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
Sep 21, 2016, 11:11 PM CDT (04:11 UTC)
Expired
Sep 22, 2016, 4:00 AM CDT
In force
5 hr
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Emergency
Flash flood emergency
Flood severity
None

Counties Anoka County, MN, Hennepin County, MN

The radar

The Minneapolis radar (KMPX), 35 km from the middle of the area, began a volume at 04:12 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
Sep 22, 12:23 AM CDTHEAVY RAIN 9.862 W Maple Grove, MNRAINFALL TOTAL SINCE THIS MORNING.

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, 4.2 hours before the alert went out and 37 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 2016-09-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 144 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 2016-09-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 428 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
144 J/kg
Mixed-layer CIN
-361 J/kg
Mixed-layer LCL
641 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
428 m²/s²
0-3 km storm-relative helicity
596 m²/s²
Significant tornado parameter
0.0
Supercell composite
11.6

Open this sounding in Storm Lab

The text

As transmitted.

764 
WGUS53 KMPX 220411
FFWMPX
MNC003-053-220900-
/O.NEW.KMPX.FF.W.0033.160922T0411Z-160922T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1111 PM CDT WED SEP 21 2016

...FLASH FLOOD EMERGENCY FOR MAPLE GROVE...BROOKLYN PARK...AND
JUST NORTH OF FRIDLEY...

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 400 AM CDT

* AT 1106 PM CDT...EMERGENCY MANAGEMENT OFFICIALS REPORTED
  WIDESPREAD...SIGNIFICANT FLOODING OCCURRING ACROSS THE WARNED
  AREA. 6 TO 9 INCHES OF RAIN HAVE ALREADY FALLEN AND 2 TO 3 MORE
  INCHES ARE LIKELY AS ADDITIONAL THUNDERSTORMS PUSH ACROSS THE
  AREA. WIDESPREAD...SIGNIFICANT FLOODING IS OCCURRING! 

  THIS IS A FLASH FLOOD EMERGENCY FOR PORTIONS OF NORTHERN HENNEPIN
  AND FAR SOUTHERN ANOKA COUNTIES...INCLUDING THE CITIES OF MAPLE
  GROVE...BROOKLYN PARK...AND JUST NORTH OF FRIDLEY. THIS IS A
  PARTICULARLY DANGEROUS SITUATION. SEEK HIGHER GROUND NOW! 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  BROOKLYN PARK...MAPLE GROVE...COON RAPIDS...BLAINE...
  BROOKLYN CENTER...FRIDLEY...MOUNDS VIEW...SPRING LAKE PARK...
  CORCORAN...OSSEO AND CRYSTAL AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. THIS IS AN EXTREMELY DANGEROUS AND
LIFE-THREATENING SITUATION. DO NOT ATTEMPT TO TRAVEL UNLESS YOU ARE
FLEEING AN AREA SUBJECT TO FLOODING OR UNDER AN EVACUATION ORDER.

&&

LAT...LON 4512 9321 4512 9323 4510 9322 4509 9323
      4508 9323 4507 9360 4511 9361 4515 9319

$$

BORGHOFF
1 follow-up statement
224 
WGUS73 KMPX 220854
FFSMPX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
354 AM CDT THU SEP 22 2016

MNC003-053-220903-
/O.EXP.KMPX.FF.W.0033.000000T0000Z-160922T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HENNEPIN MN-ANOKA MN-
354 AM CDT THU SEP 22 2016

...THE FLASH FLOOD WARNING FOR NORTHEASTERN HENNEPIN AND SOUTH
CENTRAL ANOKA COUNTIES WILL EXPIRE AT 400 AM CDT...

FLOOD WATERS ARE RECEDING...AND ADDITIONAL FLOODING IS NO LONGER
EXPECTED. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 4512 9321 4512 9323 4510 9322 4509 9323
      4508 9323 4507 9360 4511 9361 4515 9319

$$

FRANKS

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 21, 7:00 PM CDTSevere Thunderstorm WarningMPXHennepin, Wright30 min
Sep 21, 8:10 PM CDTSevere Thunderstorm WarningMPXHennepin, Ramsey50 min
Sep 21, 8:24 PM CDTFlash Flood WarningMPXHennepin, Ramsey3 hr
Sep 21, 10:07 PM CDTFlash Flood WarningMPXBlue Earth, Goodhue, Rice, Steele, Waseca7 hr
Sep 21, 11:21 PM CDTSevere Thunderstorm WarningMPXFreeborn39 min
Sep 22, 12:23 AM CDTFlash Flood WarningMPXBlue Earth, Faribault, Freeborn, Steele, Waseca4 hr
Sep 22, 2:21 AM CDTSpecial Weather StatementMPXLe Sueur, Rice3 hr
Sep 22, 2:29 AM CDTSpecial Weather StatementMPXBlue Earth3 hr
Sep 22, 3:59 AM CDTFlash Flood WatchMPXBlue Earth, Brown, Dakota, Faribault, Freeborn, Goodhue and 9 more7 hr
Sep 22, 4:48 AM CDTAreal Flood WarningMPXBlue Earth, Faribault, Freeborn, Steele, Waseca24 hr
Sep 22, 4:57 AM CDTAreal Flood WarningMPXBlue Earth, Goodhue, Le Sueur, Rice, Steele, Waseca24 hr
Sep 22, 4:57 AM CDTRiver Flood WarningMPXGoodhue70 hr
Sep 22, 6:51 AM CDTSpecial Weather StatementMPXWatonwan3 hr
Sep 22, 10:57 AM CDTRiver Flood WarningMPXGoodhue43 hr

Nearby

Flash Flood Warnings in Minnesota, 2016Every flash flood warning in 2016

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.