Alert archive / Minnesota / Flash Flood Warnings in 2022

Flash Flood Warning 7, NWS Twin Cities, MN

August 17, 2022Isanti County, Minnesota

NWS Twin Cities, MN issued this flash flood warning at Aug 17, 2022, 6:46 PM CDT for Isanti County, Minnesota. It was in force for 3 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: Aug 17, 2022, 6:46 PM CDT (23:46 UTC)
Expired: Aug 17, 2022, 9:45 PM CDT
In force: 3 hr
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Flood severity: None

County Isanti County, MN

The radar

The Minneapolis radar (KMPX), 86 km from the middle of the area, began a volume at 23:47 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 17, 8:14 PM CDT	HEAVY RAIN 5	1 E Cambridge, MN	TRAINED SPOTTER MEASURED 5 INCHES OF RAINFALL IN DOWNTOWN CAMBRIDGE, 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 12:00Z, 11.8 hours before the alert went out and 87 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: 22 J/kg
Mixed-layer CIN: -112 J/kg
Mixed-layer LCL: 1129 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

076 
WGUS53 KMPX 172346
FFWMPX
MNC059-180245-
/O.NEW.KMPX.FF.W.0007.220817T2346Z-220818T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Twin Cities/Chanhassen MN
646 PM CDT Wed Aug 17 2022

The National Weather Service in the Twin Cities has issued a

* Flash Flood Warning for...
  Central Isanti County in east central Minnesota...

* Until 945 PM CDT.

* At 646 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Cambridge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4560 9320 4560 9319 4560 9317 4558 9316
      4555 9316 4553 9320 4557 9324

FLASH FLOOD...RADAR INDICATED

$$

TDH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 4:25 PM CDT	Special Weather Statement	MPX	Ramsey	95 min
Aug 17, 4:55 PM CDT	Special Weather Statement	MPX	Washington	95 min
Aug 17, 4:58 PM CDT	Special Weather Statement	MPX	Ramsey	92 min
Aug 17, 5:16 PM CDT	Special Weather Statement	MPX	Dakota	29 min
Aug 17, 5:37 PM CDT	Special Weather Statement	MPX	Isanti	23 min
Aug 17, 5:45 PM CDT	Special Weather Statement	MPX	Dakota	30 min
Aug 17, 6:03 PM CDT	Special Weather Statement	MPX	Isanti	27 min
Aug 17, 6:20 PM CDT	Special Weather Statement	MPX	Dakota	25 min
Aug 17, 6:29 PM CDT	Special Weather Statement	MPX	Isanti	91 min
Aug 17, 6:32 PM CDT	Special Weather Statement	MPX	Anoka	28 min

Nearby

Flash Flood Warnings in Minnesota, 2022 Every flash flood warning in 2022

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.