Alert archive / Minnesota / Flash Flood Warnings in 2009

Flash Flood Warning 5, NWS Twin Cities, MN

August 8, 20094 counties in Minnesota

NWS Twin Cities, MN issued this flash flood warning at Aug 8, 2009, 1:48 AM CDT for 4 counties in Minnesota. It was in force for 4 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: Aug 8, 2009, 1:48 AM CDT (06:48 UTC)
Expired: Aug 8, 2009, 5:30 AM CDT
In force: 4 hr
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Flood severity: None

Counties Carver County, MN, Dakota County, MN, Scott County, MN, Washington County, MN

The radar

The Minneapolis radar (KMPX), 34 km from the middle of the area, began a volume at 06:52 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

Time	Report	Where	Remark
Aug 8, 2:00 AM CDT	FLASH FLOOD	1 N Apple Valley, MN	STREET FLOODING
Aug 8, 2:00 AM CDT	FLASH FLOOD	3 Ese Burnsville, MN	STREET FLOODING
Aug 8, 2:10 AM CDT	FLASH FLOOD	Shakopee, MN	COUNTY DISPATCH REPORTED CARS STALLED OUT IN HIGH WATER AT SEVERAL LOCATIONS ACROSS SHAKOPEE.

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, 6.8 hours before the alert went out and 36 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 517 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 183 m²/s²
0-3 km storm-relative helicity: 341 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KMPX 080648
FFWMPX
MNC019-037-139-163-081030-
/O.NEW.KMPX.FF.W.0005.090808T0648Z-090808T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
148 AM CDT SAT AUG 8 2009

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DAKOTA COUNTY IN EAST CENTRAL MINNESOTA
  SCOTT COUNTY IN EAST CENTRAL MINNESOTA
  SOUTHEASTERN CARVER COUNTY IN EAST CENTRAL MINNESOTA
  SOUTHWESTERN WASHINGTON COUNTY IN EAST CENTRAL MINNESOTA

* UNTIL 530 AM CDT

* AT 144 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
  WARNED AREA...AND ESTIMATED THAT 2 INCHES OF RAIN HAS FALLEN DURING
  THE PAST 2 HOURS.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...APPLE
  VALLEY...BURNSVILLE...CARVER...COATES...CREDIT RIVER...FARMINGTON...
  HAMPTON...HASTINGS...JORDAN..LAKEVILLE...MARYSTOWN...MIESVILLE AND 
  NEW TRIER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 2 TO 3 INCHES ARE POSSIBLE IN
THE WARNED AREA OVER THE NEXT 2 HOURS.

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.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.

&&

LAT...LON 4460 9377 4482 9378 4482 9341 4479 9337
      4479 9332 4482 9325 4481 9280 4474 9280
      4470 9273 4463 9275 4463 9280 4456 9280

$$

MPG

1 follow-up statement

000 
WGUS73 KMPX 080741
FFSMPX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
241 AM CDT SAT AUG 8 2009

MNC019-037-139-163-081030-
/O.CON.KMPX.FF.W.0005.000000T0000Z-090808T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON MN-CARVER MN-DAKOTA MN-SCOTT MN-
241 AM CDT SAT AUG 8 2009

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SCOTT...DAKOTA...
SOUTHEASTERN CARVER AND SOUTHWESTERN WASHINGTON COUNTIES UNTIL 530 AM
CDT...

AT 234 AM CDT...NATIONAL WEATHER SERVICE RADAR CONTINUED TO INDICATE 
THUNDERSTORMS WITH VERY HEAVY RAINFALL...TRAINING ACROSS THE AREA.  
ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE THROUGH 
530 AM. 

NUMEROUS REPORTS OF STREET FLOODING HAVE BEEN RECEIVED FROM MUCH OF 
CARVER...NORTHERN SCOTT...AND NORTHERN DAKOTA COUNTIES.   

SLOW MOVING THUNDERSTORMS ARE PRODUCING VERY HEAVY RAINFALL IN THE
WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH
FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING 
INCLUDE...APPLE VALLEY...BURNSVILLE...CARVER...COATES...CREDIT 
RIVER...FARMINGTON...HAMPTON...HASTINGS...JORDAN...LAKEVILLE...
MIESVILLE...NEW TRIER...PRIOR 
LAKE...ROSEMOUNT...SAVAGE...SHAKOPEE...AND VERMILLION.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 4460 9377 4482 9378 4482 9341 4479 9337
      4479 9332 4482 9325 4481 9280 4474 9280
      4470 9273 4463 9275 4463 9280 4456 9280

$$
JPR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 10:39 PM CDT	Special Weather Statement	MPX	Sibley	51 min
Aug 7, 11:04 PM CDT	Special Weather Statement	MPX	Renville	26 min
Aug 8, 12:24 AM CDT	Areal Flood Advisory	MPX	Anoka, Carver, Dakota, Hennepin, McLeod, Ramsey and 3 more	3 hr
Aug 8, 12:28 AM CDT	Areal Flood Advisory	MPX	Anoka, Carver, Dakota, Hennepin, McLeod, Ramsey and 3 more	3 hr
Aug 8, 1:01 AM CDT	Flash Flood Warning	MPX	Carver, Dakota, Hennepin, Ramsey, Washington	4 hr
Aug 8, 4:06 AM CDT	Flash Flood Watch	MPX	Anoka, Carver, Chippewa, Dakota, Goodhue, Hennepin and 14 more	19 hr
Aug 8, 4:11 AM CDT	Severe Thunderstorm Warning	MPX	Meeker, Sherburne, Stearns, Wright	38 min
Aug 8, 4:19 AM CDT	Heat Advisory	MPX	Blue Earth, Brown, Carver, Dakota, Faribault, Freeborn and 14 more	14 hr
Aug 8, 5:02 AM CDT	Areal Flood Advisory	MPX	Benton, Mille Lacs, Sherburne, Stearns, Wright	3 hr
Aug 8, 5:29 AM CDT	Special Weather Statement	MPX	Benton	61 min
Aug 8, 8:06 AM CDT	Severe Thunderstorm Warning	MPX	Renville	39 min
Aug 8, 9:32 AM CDT	Special Weather Statement	MPX	Hennepin, Ramsey	43 min
Aug 8, 9:43 AM CDT	Flash Flood Warning	MPX	Anoka, Hennepin, Wright	3 hr
Aug 8, 3:46 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Redwood	28 min

Nearby

Flash Flood Warnings in Minnesota, 2009 Every flash flood warning in 2009

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.