Alert archive / Minnesota / Flash Flood Warnings in 2016

Flash Flood Warning 31, NWS Twin Cities, MN

September 21, 2016Hennepin County, Ramsey County, Minnesota

NWS Twin Cities, MN issued this flash flood warning at Sep 21, 2016, 8:24 PM CDT for Hennepin County, Ramsey County, Minnesota. It was in force for 3 hr. 3 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
Sep 21, 2016, 8:24 PM CDT (01:24 UTC)
Expired
Sep 21, 2016, 11:30 PM CDT
In force
3 hr
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Flood severity
None

Counties Hennepin County, MN, Ramsey County, MN

The radar

The Minneapolis radar (KMPX), 31 km from the middle of the area, began a volume at 01:26 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 21, 9:30 PM CDTHEAVY RAIN 1.433 Sse Minneapolis, MN.
Sep 21, 9:30 PM CDTHEAVY RAIN 1.433 Sse Minneapolis, MN. THE DURATION OF THE HEAVY RAIN EVENT WAS 1 HOUR.
Sep 21, 10:23 PM CDTHEAVY RAIN 1.522 Wnw Mendota Heights, 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, 1.4 hours before the alert went out and 33 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°0°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.

705 
WGUS53 KMPX 220124
FFWMPX
MNC053-123-220430-
/O.NEW.KMPX.FF.W.0031.160922T0124Z-160922T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 1130 PM CDT

* AT 823 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. FLASH FLOODING IS EXPECTED TO
  BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  MINNEAPOLIS...ST. PAUL...PLYMOUTH...EDEN PRAIRIE...MINNETONKA...
  EDINA...ST. LOUIS PARK...MAPLEWOOD...RICHFIELD...ROSEVILLE...
  SHOREVIEW AND WHITE BEAR LAKE.

RAINFALL AMOUNTS OF 2 TO 3 ARE POSSIBLE IN THE WARNED AREA.

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 4489 9299 4489 9303 4492 9305 4492 9313
      4489 9316 4489 9352 4490 9353 4504 9354
      4503 9324 4507 9299

$$

BORGHOFF

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, 10:07 PM CDTFlash Flood WarningMPXBlue Earth, Goodhue, Rice, Steele, Waseca7 hr
Sep 21, 11:11 PM CDTFlash Flood Warning EmergencyMPXAnoka, Hennepin5 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.