Alert archive / Minnesota / Flash Flood Warnings in 2020

Flash Flood Warning 5, NWS Twin Cities, MN

June 29, 20204 counties in Minnesota

NWS Twin Cities, MN issued this flash flood warning at Jun 29, 2020, 7:23 AM CDT for 4 counties in Minnesota. It was in force for 5 hr. 6 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: Jun 29, 2020, 7:23 AM CDT (12:23 UTC)
Expired: Jun 29, 2020, 12:30 PM CDT
In force: 5 hr
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Flood severity: None

Counties Blue Earth County, MN, Brown County, MN, Le Sueur County, MN, Nicollet County, MN

The radar

The Minneapolis radar (KMPX), 92 km from the middle of the area, began a volume at 12:27 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
Jun 29, 8:00 AM CDT	HEAVY RAIN 4.55	1 Wnw St. Peter, MN	COCORAHS STATION MN-NC-11 SAINT PETER 0.6 NW.
Jun 29, 8:15 AM CDT	FLASH FLOOD	1 Wnw Kasota, MN	MUD SLIDE SOUTH OF ST PETER ON HWY 169.
Jun 29, 8:30 AM CDT	FLASH FLOOD	4 Nw Lake Crystal, MN	WATER OVER ROAD AT 206TH AND 494TH. REPORT OF A MUD SLIDE NEAR HIGHWAY 68 AND COUNTY ROAD 42, JUST SOUTH OF JUDSON.
Jun 29, 8:35 AM CDT	HEAVY RAIN 3.08	3 Ne Mankato, MN	COCORAHS STATION MN-BU-35 MANKATO 2.2 NNE.
Jun 29, 9:18 AM CDT	FLASH FLOOD	3 Se Nicollet, MN	WATER RUSHING OVER 490TH ST AT HWY14.
Jun 29, 11:30 AM CDT	HEAVY RAIN 3.78	5 Sse Searles, MN	MESONET STATION DW7572 HANSKA.

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 12:00Z, 0.4 hours before the alert went out and 90 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: 47 J/kg
Mixed-layer CIN: -327 J/kg
Mixed-layer LCL: 2186 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 300 m²/s²
0-3 km storm-relative helicity: 406 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

259 
WGUS53 KMPX 291223
FFWMPX
MNC013-015-079-103-291530-
/O.NEW.KMPX.FF.W.0005.200629T1223Z-200629T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Twin Cities/Chanhassen MN
723 AM CDT Mon Jun 29 2020

The National Weather Service in the Twin Cities has issued a

* Flash Flood Warning for...
  Northern Blue Earth County in south central Minnesota...
  Southeastern Brown County in south central Minnesota...
  Southwestern Le Sueur County in south central Minnesota...
  Southeastern Nicollet County in south central Minnesota...

* Until 1030 AM CDT.

* At 723 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 3 and 5 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Additional rainfall amounts of 1 to 3 inches are possible.

* Some locations that will experience flash flooding include...
  Mankato, North Mankato, St. Peter, Lake Crystal, Nicollet, Kasota, 
  Courtland, Hanska, Cleveland, Judson, Oshawa, Skyline, Mankato 
  Airport and Searles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4412 9456 4418 9458 4425 9444 4436 9387
      4435 9379 4423 9378 4414 9400 4410 9437
      4411 9437 4411 9451

FLASH FLOOD...RADAR INDICATED

$$

JRB

2 follow-up statements

728 
WGUS73 KMPX 291425
FFSMPX

Flash Flood Statement
National Weather Service Twin Cities/Chanhassen MN
925 AM CDT Mon Jun 29 2020

MNC013-015-079-103-291530-
/O.CON.KMPX.FF.W.0005.000000T0000Z-200629T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Blue Earth MN-Brown MN-Le Sueur MN-Nicollet MN-
925 AM CDT Mon Jun 29 2020

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 AM CDT THIS 
MORNING FOR NORTHERN BLUE EARTH, SOUTHEASTERN BROWN, SOUTHWESTERN LE 
SUEUR AND SOUTHEASTERN NICOLLET COUNTIES...

At 925 AM CDT, local law enforcement reported thunderstorms 
producing heavy rain across the warned area. Between 4 and 6 inches 
of rain have fallen. Flash flooding is ongoing or expected to begin 
shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Law enforcement.

IMPACT...Flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other
         drainage and low lying areas.

Additional rainfall amounts of 1 to 2 inches are possible.

Some locations that will experience flash flooding include...
  Mankato, North Mankato, St. Peter, Lake Crystal, Nicollet, Kasota, 
  Courtland, Hanska, Cleveland, Judson, Oshawa, Skyline, Mankato 
  Airport and Searles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4412 9456 4418 9458 4425 9444 4436 9387
      4435 9379 4423 9378 4414 9400 4410 9437
      4411 9437 4411 9451

FLASH FLOOD...OBSERVED

$$

JRB

575 
WGUS53 KMPX 291503
FFWMPX
MNC013-015-079-103-291730-
/O.EXT.KMPX.FF.W.0005.000000T0000Z-200629T1730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Twin Cities/Chanhassen MN
1003 AM CDT Mon Jun 29 2020

The National Weather Service in the Twin Cities has extended the

* Flash Flood Warning for...
  Northern Blue Earth County in south central Minnesota...
  Southeastern Brown County in south central Minnesota...
  Southwestern Le Sueur County in south central Minnesota...
  Southeastern Nicollet County in south central Minnesota...

* Until 1230 PM CDT.

* At 1003 AM CDT, local law enforcement reported water over roadways 
  and mud slides on roads within river valleys. Between 5 and 8 
  inches of rain have fallen. Flash flooding is already occurring.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Law enforcement.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Additional rainfall amounts of 1 to 2 inches are possible.

* Some locations that will experience flash flooding include...
  Mankato, North Mankato, St. Peter, Lake Crystal, Nicollet, Kasota, 
  Courtland, Hanska, Cleveland, Judson, Oshawa, Skyline, Mankato 
  Airport and Searles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4412 9456 4418 9458 4425 9444 4436 9387
      4435 9379 4423 9378 4414 9400 4410 9437
      4411 9437 4411 9451

FLASH FLOOD...OBSERVED

$$

Dye

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 7:06 PM CDT	Tornado Warning	MPX	Goodhue	24 min
Jun 28, 7:14 PM CDT	Special Weather Statement	MPX	Dakota	31 min
Jun 28, 7:25 PM CDT	Special Weather Statement	MPX	Washington	35 min
Jun 28, 7:46 PM CDT	Special Weather Statement	MPX	Dakota	29 min
Jun 28, 10:27 PM CDT	Special Weather Statement	MPX	Washington	2 hr
Jun 28, 10:52 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Nicollet	23 min
Jun 28, 11:15 PM CDT	Special Weather Statement	MPX	Nicollet	45 min
Jun 28, 11:30 PM CDT	Severe Thunderstorm Warning	MPX	Nicollet, Sibley	30 min
Jun 29, 12:01 AM CDT	Special Weather Statement	MPX	Sibley	29 min
Jun 29, 12:21 AM CDT	Tornado Warning	MPX	Sibley	39 min
Jun 29, 12:46 AM CDT	Special Weather Statement	MPX	Renville, Sibley	59 min
Jun 29, 1:19 AM CDT	Flash Flood Warning	MPX	McLeod, Renville, Sibley	3 hr
Jun 29, 1:31 AM CDT	Flash Flood Watch	MPX	Anoka, Blue Earth, Brown, Carver, Chisago, Dakota and 19 more	10 hr
Jun 29, 1:45 AM CDT	Special Weather Statement	MPX	Chippewa	60 min
Jun 29, 2:42 AM CDT	Special Weather Statement	MPX	Carver, Scott	48 min
Jun 29, 3:03 AM CDT	Special Weather Statement	MPX	Dakota, Le Sueur, Rice	57 min
Jun 29, 4:27 AM CDT	Heat Advisory	MPX	Anoka, Carver, Chippewa, Dakota, Hennepin, Lac qui Parle and 6 more	8 hr
Jun 29, 4:29 AM CDT	Special Weather Statement	MPX	Le Sueur, Nicollet, Scott, Sibley	46 min
Jun 29, 4:33 AM CDT	Special Weather Statement	MPX	Dakota, Goodhue, Rice, Washington	57 min
Jun 29, 5:49 AM CDT	Special Weather Statement	MPX	Pope, Swift	56 min
Jun 29, 6:46 AM CDT	Special Weather Statement	MPX	Chippewa, Kandiyohi	59 min
Jun 29, 7:18 AM CDT	Special Weather Statement	MPX	Le Sueur	57 min
Jun 29, 8:17 AM CDT	Special Weather Statement	MPX	Wright	43 min
Jun 29, 8:33 AM CDT	Flash Flood Warning	MPX	Le Sueur, Rice	3 hr
Jun 29, 8:34 AM CDT	Special Weather Statement	MPX	Le Sueur, Rice	26 min
Jun 29, 9:18 AM CDT	Special Weather Statement	MPX	Nicollet, Sibley	57 min
Jun 29, 11:40 AM CDT	Areal Flood Warning	MPX	Le Sueur, Rice	4 hr
Jun 29, 3:57 PM CDT	Special Weather Statement	MPX	Mille Lacs	63 min
Jun 29, 4:27 PM CDT	Special Weather Statement	MPX	Todd	33 min
Jun 29, 5:02 PM CDT	Special Weather Statement	MPX	Morrison, Todd	58 min
Jun 29, 6:04 PM CDT	Special Weather Statement	MPX	Morrison	71 min
Jun 29, 6:42 PM CDT	Flash Flood Warning	MPX	Morrison	5 hr

Nearby

Flash Flood Warnings in Minnesota, 2020 Every flash flood warning in 2020

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.