Alert archive / North Dakota / Flash Flood Warnings in 2016

Flash Flood Warning 7, NWS Grand Forks, ND

August 3, 2016Grand Forks County, North Dakota; Polk County, Minnesota

NWS Grand Forks, ND issued this flash flood warning at Aug 3, 2016, 11:01 PM CDT for Grand Forks County, North Dakota; Polk County, Minnesota. It was in force for 2 hr. 2 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 3, 2016, 11:01 PM CDT (04:01 UTC)
Expired: Aug 4, 2016, 1:30 AM CDT
In force: 2 hr
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Flood severity: None

Counties Polk County, MN, Grand Forks County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 46 km from the middle of the area, began a volume at 04:03 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 3, 11:40 PM CDT	FLASH FLOOD	Grand Forks, ND	AREAS OF UNIVERSITY AND DEMERS AVENUES...AND NEARBY PORTIONS OF WASHINGTON STREET WERE FLOODED AND IMPASSABLE. UNDERPASS FLOODED AND BLOCKED TO TRAFFIC. OUTLYING AREAS ON 42ND STREET WERE ALSO FLOODED.
Aug 3, 11:45 PM CDT	FLASH FLOOD	2 Ene East Grand Forks, MN	FIELD AND FARM ACCESS ROADS FLOODED NEAR CR17 AND HIGHWAY 2.

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, 4.0 hours before the alert went out and 285 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: 258 J/kg
Mixed-layer CIN: -171 J/kg
Mixed-layer LCL: 1753 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

424 
WGUS53 KFGF 040401
FFWFGF
MNC119-NDC035-040630-
/O.NEW.KFGF.FF.W.0007.160804T0401Z-160804T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1101 PM CDT WED AUG 3 2016

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN POLK COUNTY IN NORTHWESTERN MINNESOTA...
  EAST CENTRAL GRAND FORKS COUNTY IN NORTHEASTERN NORTH DAKOTA...

* UNTIL 130 AM CDT

* AT 1058 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN OVER THE GRAND FORKS METROPOLITAN AREA. STORMS ARE
  BEGINNING TO TRAIN OVER THE CITY AND OTHER NEARBY COMMUNITIES.
  ADDITIONAL HEAVY TRAINFALL IS EXPECTED AND FLASH FLOODING IS
  EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  GRAND FORKS...EAST GRAND FORKS...CROOKSTON...FISHER...MERRIFIELD...
  MALLORY AND BYGLAND.

ALSO INCLUDES INTERSTATE 29 BETWEEN MILE MARKERS 132 AND 147.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS.  DON'T
DRIVE THROUGH FLOODEDUNDERPASSES. MOST FLOOD DEATHS OCCUR IN
VEHICLES.

&&

LAT...LON 4782 9725 4801 9726 4803 9670 4774 9657

$$

GUST

1 follow-up statement

081 
WGUS73 KFGF 040613
FFSFGF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
113 AM CDT THU AUG 4 2016

MNC119-NDC035-040622-
/O.CAN.KFGF.FF.W.0007.000000T0000Z-160804T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
POLK MN-GRAND FORKS ND-
113 AM CDT THU AUG 4 2016

...THE FLASH FLOOD WARNING FOR NORTHWESTERN POLK AND EAST CENTRAL
GRAND FORKS COUNTIES IS CANCELLED...

THE HEAVY RAIN HAS ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 4782 9725 4801 9726 4803 9670 4774 9657

$$

VG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 7:04 PM CDT	Flash Flood Warning	FGF	Towner	3 hr
Aug 3, 7:15 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Pembina, Ramsey, Walsh	60 min
Aug 3, 7:29 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Cavalier, Ramsey, Towner, Walsh	46 min
Aug 3, 7:38 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey	52 min
Aug 3, 7:55 PM CDT	Severe Thunderstorm Warning	FGF	Pembina, Walsh	65 min
Aug 3, 8:14 PM CDT	Severe Thunderstorm Warning	FGF	Ramsey	61 min
Aug 3, 8:19 PM CDT	Tornado Warning	FGF	Ramsey	41 min
Aug 3, 8:24 PM CDT	Tornado Warning	FGF	Benson, Eddy	51 min
Aug 3, 9:13 PM CDT	Tornado Warning	FGF	Eddy, Nelson	47 min
Aug 3, 9:54 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Griggs, Nelson, Steele	20 min
Aug 3, 10:12 PM CDT	Severe Thunderstorm Warning	FGF	Griggs, Steele	48 min
Aug 3, 10:22 PM CDT	Special Weather Statement	FGF	Grand Forks	53 min
Aug 3, 10:29 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	61 min
Aug 3, 11:16 PM CDT	Special Weather Statement	FGF	Ransom	44 min
Aug 3, 11:52 PM CDT	Severe Thunderstorm Warning	FGF	Ransom, Richland, Sargent	38 min
Aug 4, 12:20 AM CDT	Severe Thunderstorm Warning	FGF	Cass	40 min
Aug 3, 9:32 PM CDT	Special Weather Statement	FGF	Marshall	58 min
Aug 3, 11:31 PM CDT	Special Weather Statement	FGF	Beltrami, Clearwater	59 min
Aug 4, 12:47 AM CDT	Special Weather Statement	FGF	Clearwater	43 min
Aug 4, 1:04 AM CDT	Special Weather Statement	FGF	Grant, Wilkin	41 min
Aug 4, 1:11 AM CDT	Special Weather Statement	FGF	Becker	49 min
Aug 4, 2:22 AM CDT	Severe Thunderstorm Warning	FGF	Hubbard, Wadena	23 min

Nearby

Flash Flood Warnings in North Dakota, 2016 Flash Flood Warnings in Minnesota, 2016 Every flash flood warning in 2016

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.