Alert archive / North Dakota / Flash Flood Warnings in 2020

Flash Flood Warning 3, NWS Grand Forks, ND

July 4, 2020Grand Forks County, Walsh County, North Dakota

NWS Grand Forks, ND issued this flash flood warning at Jul 4, 2020, 6:08 AM CDT for Grand Forks County, Walsh County, North Dakota. It was in force for 8 hr. 10 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: Jul 4, 2020, 6:08 AM CDT (11:08 UTC)
Expired: Jul 4, 2020, 2:00 PM CDT
In force: 8 hr
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Flood severity: None

Counties Grand Forks County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 81 km from the middle of the area, began a volume at 11:11 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
Jul 4, 9:00 AM CDT	FLASH FLOOD	Manvel, ND	STREETS AND RURAL ROADS FLOODED IN AND AROUND MANVEL. FIELDS, FARMSTEAD AND HOEMSTEAD ACCESS ROADS FLOODED IN NORTHERN FERRY AND TURTLE RIVER TOWNSHIPS. WATER LAPPING AGAINS GARAGE DOORS AND HOUSE FOUNDATIONS AT SOME LOCATIONS.
Jul 4, 9:30 AM CDT	FLASH FLOOD	4 E Ardoch, ND	FIELDS AND FARM ACCESS ROADS FLOODED ACROSS PORTIONS OF ARDOCH AND WALSHVILLE TOWNSHIPS.
Jul 4, 9:30 AM CDT	FLASH FLOOD	4 E Ardoch, ND	FIELDS AND FARM ACCESS ROADS FLOODED ACROSS PORTIONS OF ARDOCH AND WALSHVILLE TOWNSHIPS.
Jul 4, 9:30 AM CDT	HEAVY RAIN 3.5	1 S Manvel, ND	REPORTS OF STREET FLOODING
Jul 4, 9:30 AM CDT	HEAVY RAIN 3.5	Manvel, ND	REPORTS OF STREET FLOODING AROUND TOWN
Jul 4, 9:30 AM CDT	HEAVY RAIN 3.5	Manvel, ND	REPORTS OF STREET FLOODING AROUND TOWN.
Jul 4, 9:30 AM CDT	HEAVY RAIN 4.5	4 E Ardoch, ND	SOME ADDITIONAL RAIN AFTER.
Jul 4, 9:30 AM CDT	HEAVY RAIN 4.5	4 E Ardoch, ND	SOME ADDITIONAL RAIN AFTER.
Jul 4, 10:00 AM CDT	HEAVY RAIN 3.1	6 E Ardoch, ND	MEASURED WITH A 4 INCH DIAMETER RAIN GAUGE.
Jul 4, 10:00 AM CDT	HEAVY RAIN 3.1	6 E Ardoch, ND	MEASURED WITH A 4 INCH DIAMETER RAIN GAUGE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 11.1 hours before the alert went out and 293 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: 1345 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1926 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: -33 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

850 
WGUS53 KFGF 041108
FFWFGF
NDC035-099-041900-
/O.NEW.KFGF.FF.W.0003.200704T1108Z-200704T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Grand Forks ND
608 AM CDT Sat Jul 4 2020

The National Weather Service in Grand Forks has issued a

* Flash Flood Warning for...
  Northeastern Grand Forks County in northeastern North Dakota...
  Southeastern Walsh County in northeastern North Dakota...

* Until 200 PM CDT Saturday.

* At 608 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 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.

* Some locations that will experience flash flooding include...
  Grafton, Minto, Manvel, Forest River, Warsaw, Oakwood, Ardoch, 
  Voss, Johnstown and Poland.

This includes the following highways...
	Interstate 29 between mile markers 149 and 181.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Safety message - Turn around, don't drown. Don't travel through 
flooded areas. 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.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, country roads, farmland, and other low lying 
spots.

Please report flooding to your local law enforcement agency when you 
can do so safely.

&&

LAT...LON 4827 9754 4843 9753 4850 9720 4849 9714
      4848 9716 4848 9714 4839 9716 4831 9713
      4831 9712 4822 9715 4822 9714 4814 9715
      4814 9712 4806 9709 4800 9717 4798 9727
      4802 9737 4816 9748

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-3 INCHES IN 4 HOURS 

$$

CJ

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 4, 2:26 AM CDT	Severe Thunderstorm Warning	FGF	Pembina	39 min
Jul 4, 3:57 AM CDT	Special Weather Statement	FGF	Pembina	63 min
Jul 4, 4:18 AM CDT	Special Weather Statement	FGF	Grand Forks	57 min
Jul 4, 4:55 AM CDT	Areal Flood Advisory	FGF	Grand Forks, Pembina, Walsh	14 hr
Jul 4, 6:15 AM CDT	Flash Flood Warning	FGF	Pembina, Walsh	8 hr
Jul 4, 8:47 AM CDT	Special Weather Statement	FGF	Grand Forks	58 min
Jul 4, 9:13 AM CDT	River Flood Warning	FGF	Grand Forks, Walsh	4 days
Jul 4, 9:13 AM CDT	River Flood Warning	FGF	Pembina, Walsh	6 days
Jul 4, 9:13 AM CDT	River Flood Warning	FGF	Pembina	7 days
Jul 4, 4:06 PM CDT	Special Weather Statement	FGF	Cass	54 min
Jul 4, 4:14 PM CDT	Special Weather Statement	FGF	Ransom	61 min
Jul 4, 4:52 PM CDT	Special Weather Statement	FGF	Ransom	53 min
Jul 4, 5:08 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Ransom, Richland	19 min
Jul 4, 5:47 PM CDT	Special Weather Statement	FGF	Ransom	58 min

Nearby

Flash Flood Warnings in North Dakota, 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.