Alert archive / Minnesota / Flash Flood Warnings in 2016

Flash Flood Warning 10, NWS Grand Forks, ND

August 28, 2016Mahnomen County, Norman County, Polk County, Minnesota

NWS Grand Forks, ND issued this flash flood warning at Aug 28, 2016, 10:37 PM CDT for Mahnomen County, Norman County, Polk County, Minnesota. It was in force for 10 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 28, 2016, 10:37 PM CDT (03:37 UTC)
Expired: Aug 29, 2016, 9:00 AM CDT
In force: 10 hr
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Flood severity: None

Counties Mahnomen County, MN, Norman County, MN, Polk County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 82 km from the middle of the area, began a volume at 03:38 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 28, 11:00 PM CDT	FLASH FLOOD	Fertile, MN	OVER 5 INCHES OF RAIN FELL IN LESS THAN TWO HOURS ACROSS SOUTHERN GARFIELD AMD LIBERTY TOWNSHIPS... WITH AREA FIELDS AND FARM ACCESS ROADS FLOODED. CITY STREETS WERE FLOODED AS WELL.
Aug 28, 11:20 PM CDT	FLASH FLOOD	Flaming, MN	FROM 4 TO 8 INCHES OF RAIN FELL IN ABOUT 2 HOURS ACROSS EASTERN SPRING CREEK AND SUNDAL TOWNSHIPS... RESULTING IN FLOODED FIELDS AND FARM ACCESS ROADS.

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, 3.6 hours before the alert went out and 246 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: 36 J/kg
Mixed-layer CIN: -153 J/kg
Mixed-layer LCL: 1127 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 235 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

275 
WGUS53 KFGF 290337
FFWFGF
MNC087-107-119-291400-
/O.NEW.KFGF.FF.W.0010.160829T0337Z-160829T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1037 PM CDT SUN AUG 28 2016

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL POLK COUNTY IN NORTHWESTERN MINNESOTA...
  NORTHWESTERN MAHNOMEN COUNTY IN NORTHWESTERN MINNESOTA...
  NORTHEASTERN NORMAN COUNTY IN NORTHWESTERN MINNESOTA...

* UNTIL 900 AM CDT MONDAY

* AT 1031 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ALONG A LINE EXTENDING FROM HAROLD TO NEAR FERTILE TO
  BEJOU. THE STORM IS NEARLY STATIONARY. RADAR INDICATED UP TO FOUR
  AND A HALF INCHES OF RAIN HAVE ALREADY FALLEN.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  FERTILE..MELVIN AND RINDAL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 4739 9604 4741 9641 4765 9663 4776 9644
      4764 9621 4753 9586

$$

JH

2 follow-up statements

290 
WGUS73 KFGF 291000
FFSFGF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
500 AM CDT MON AUG 29 2016

MNC087-107-119-291400-
/O.CON.KFGF.FF.W.0010.000000T0000Z-160829T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
POLK MN-MAHNOMEN MN-NORMAN MN-
500 AM CDT MON AUG 29 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 AM CDT FOR
SOUTH CENTRAL POLK...NORTHWESTERN MAHNOMEN AND NORTHEASTERN NORMAN
COUNTIES...

AT 454 AM CDT...THUNDERSTORMS EARLIER IN THE NIGHT PRODUCED HEAVY
RAINFALL IN THE WARNED AREA. WATER LEVELS ARE LIKELY STILL RUNNING
HIGH IN SOME AREAS. SOME LOCATIONS THAT MAY BE EXPERIENCING FLOODING
INCLUDE... FERTILE...WINGER...MAPLE BAY...BELTRAMI...RINDAL...
GREENVIEW AND HAROLD. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 4739 9604 4741 9641 4765 9663 4776 9644
      4764 9621 4753 9586

$$

KNUTSVIG

795 
WGUS73 KFGF 291356
FFSFGF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
856 AM CDT MON AUG 29 2016

MNC087-107-119-291403-
/O.EXP.KFGF.FF.W.0010.000000T0000Z-160829T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
POLK MN-MAHNOMEN MN-NORMAN MN-
856 AM CDT MON AUG 29 2016

...THE FLASH FLOOD WARNING FOR SOUTH CENTRAL POLK...NORTHWESTERN
MAHNOMEN AND NORTHEASTERN NORMAN COUNTIES WILL EXPIRE AT 900 AM
CDT...

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

LAT...LON 4739 9604 4741 9641 4765 9663 4776 9644
      4764 9621 4753 9586

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 7:48 PM CDT	Special Weather Statement	FGF	Polk, Red Lake	42 min
Aug 28, 7:49 PM CDT	Special Weather Statement	FGF	Lake of the Woods	56 min
Aug 28, 8:03 PM CDT	Tornado Warning Tornado observed	FGF	Polk, Red Lake	27 min
Aug 28, 8:27 PM CDT	Tornado Warning	FGF	Mahnomen, Polk, Red Lake	33 min
Aug 28, 8:50 PM CDT	Tornado Warning	FGF	Mahnomen, Norman, Polk	25 min
Aug 28, 9:05 PM CDT	Severe Thunderstorm Warning	FGF	Mahnomen, Norman, Polk	40 min
Aug 28, 9:12 PM CDT	Tornado Warning Tornado observedConsiderable damage threat	FGF	Norman, Polk	48 min
Aug 28, 9:41 PM CDT	Areal Flood Advisory	FGF	Norman, Polk	7 hr
Aug 28, 9:56 PM CDT	Tornado Warning Tornado observed	FGF	Norman	49 min
Aug 28, 10:41 PM CDT	Tornado Warning	FGF	Becker, Mahnomen, Norman	49 min
Aug 28, 11:31 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Clearwater, Mahnomen, Norman	59 min
Aug 29, 2:11 AM CDT	Special Weather Statement	FGF	Otter Tail, Wadena	64 min
Aug 29, 3:29 AM CDT	Special Weather Statement	FGF	Otter Tail	61 min
Aug 29, 4:36 AM CDT	Areal Flood Advisory	FGF	Beltrami, Clearwater, Hubbard	3 hr

Nearby

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.