Alert archive / Minnesota / Flash Flood Warnings in 2020
Flash Flood Warning 18, NWS Twin Cities, MN
NWS Twin Cities, MN issued this flash flood warning at Aug 22, 2020, 1:22 AM CDT for Blue Earth County, Brown County, Nicollet County, Minnesota. It was in force for 4 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
- Aug 22, 2020, 1:22 AM CDT (06:22 UTC)
- Expired
- Aug 22, 2020, 5:15 AM CDT
- In force
- 4 hr
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
- Flood severity
- None
Counties Blue Earth County, MN, Brown County, MN, Nicollet County, MN
The radar
The Minneapolis radar (KMPX), 83 km from the middle of the area, began a volume at 06:23 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 00:00Z, 6.4 hours before the alert went out and 82 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.
- Mixed-layer CAPE
- 2353 J/kg
- Mixed-layer CIN
- -98 J/kg
- Mixed-layer LCL
- 1265 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 276 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
144
WGUS53 KMPX 220622
FFWMPX
MNC013-015-103-221015-
/O.NEW.KMPX.FF.W.0018.200822T0622Z-200822T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Twin Cities/Chanhassen MN
122 AM CDT Sat Aug 22 2020
The National Weather Service in the Twin Cities has issued a
* Flash Flood Warning for...
Blue Earth County in south central Minnesota...
Northeastern Brown County in south central Minnesota...
Nicollet County in south central Minnesota...
* Until 515 AM CDT.
* At 122 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, New Ulm, North Mankato, Lake Crystal, Eagle Lake,
Nicollet, Madison Lake, St. Clair, Courtland, Good Thunder,
Lafayette, Pemberton, Garden City, Judson, Oshawa, Skyline,
Searles, and Klossner.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
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 4424 9377 4393 9377 4394 9408 4416 9437
4442 9479 4446 9479 4446 9437 4431 9408
4424 9402
FLASH FLOOD...RADAR INDICATED
$$1 follow-up statement
568
WGUS73 KMPX 220906
FFSMPX
Flash Flood Statement
National Weather Service Twin Cities/Chanhassen MN
406 AM CDT Sat Aug 22 2020
MNC013-015-103-221015-
/O.CON.KMPX.FF.W.0018.000000T0000Z-200822T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Blue Earth MN-Brown MN-Nicollet MN-
406 AM CDT Sat Aug 22 2020
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 AM CDT EARLY THIS
MORNING FOR BLUE EARTH, NORTHEASTERN BROWN AND NICOLLET COUNTIES...
At 406 AM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 3 and 6 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly. The
heaviest rain has been observed in central Blue Earth county, where
radar estimates show over 6 inches of rain have fallen near Good
Thunder.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Doppler radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
Additional rainfall amounts up to 1 inch are possible.
Some locations that will experience flash flooding include...
Mankato, New Ulm, North Mankato, Lake Crystal, Eagle Lake,
Nicollet, Madison Lake, St. Clair, Courtland, Good Thunder,
Lafayette, Pemberton, Garden City, Judson, Oshawa, Skyline,
Searles, and Klossner.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses
as well as other drainage areas and low lying spots.
&&
LAT...LON 4424 9377 4393 9377 4394 9408 4416 9437
4442 9479 4446 9479 4446 9437 4431 9408
4424 9402
FLASH FLOOD...RADAR INDICATED
$$
MPGThe office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 7:00 PM CDT | Special Weather Statement | MPX | Chippewa | 60 min |
| Aug 21, 7:20 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa, Kandiyohi, Pope, Swift | 55 min |
| Aug 21, 7:55 PM CDT | Special Weather Statement | MPX | Kandiyohi, Meeker, Stearns | 50 min |
| Aug 21, 8:00 PM CDT | Special Weather Statement | MPX | Renville | 60 min |
| Aug 21, 8:43 PM CDT | Special Weather Statement | MPX | McLeod | 47 min |
| Aug 21, 9:07 PM CDT | Special Weather Statement | MPX | Carver, Wright | 38 min |
| Aug 21, 9:37 PM CDT | Special Weather Statement | MPX | Anoka, Carver, Hennepin, Ramsey, Scott | 53 min |
| Aug 21, 10:12 PM CDT | Special Weather Statement | MPX | Le Sueur | 48 min |
| Aug 21, 10:27 PM CDT | Special Weather Statement | MPX | Renville | 33 min |
| Aug 21, 11:19 PM CDT | Special Weather Statement | MPX | Sibley | 41 min |
| Aug 22, 12:13 AM CDT | Special Weather Statement | MPX | Nicollet | 3 hr |
| Aug 22, 1:25 AM CDT | Special Weather Statement | MPX | Faribault, Freeborn, Steele, Waseca | 3 hr |
| Aug 22, 6:51 AM CDT | Special Weather Statement | MPX | Sherburne | 39 min |
| Aug 22, 8:47 AM CDT | Special Weather Statement | MPX | Morrison | 43 min |
| Aug 22, 9:26 AM CDT | Special Weather Statement | MPX | Kanabec, Mille Lacs | 64 min |
Nearby
Flash Flood Warnings in Minnesota, 2020Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.