Alert archive / North Dakota / Flash Flood Warnings in 2011

Flash Flood Warning 8, NWS Grand Forks, ND

July 19, 2011Cass County, North Dakota

NWS Grand Forks, ND issued this flash flood warning at Jul 19, 2011, 5:31 AM CDT for Cass County, North Dakota. It was in force for 5 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: Jul 19, 2011, 5:31 AM CDT (10:31 UTC)
Expired: Jul 19, 2011, 10:16 AM CDT
In force: 5 hr
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Flood severity: None

County Cass County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 70 km from the middle of the area, began a volume at 10:31 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 19, 7:00 AM CDT	FLASH FLOOD	5 Ene Casselton, ND	WATER WAS FLOWING OVER SEVERAL SECTIONS OF COUNTY AND TOWNSHIP ROADS IN SOUTHERN AND CENTRAL HARMONY TOWNSHIP. NUMEROUS FARM ACCESS ROADS AND FIELDS WERE FLOODED.

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

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 10.5 hours before the alert went out and 245 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: 6467 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 882 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 318 m²/s²
Significant tornado parameter: 10.1
Supercell composite: 42.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

905 
WGUS53 KFGF 191032
FFWFGF
NDC017-191600-
/O.NEW.KFGF.FF.W.0008.110719T1032Z-110719T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
531 AM CDT TUE JUL 19 2011

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL CASS COUNTY IN SOUTHEAST NORTH DAKOTA...

* UNTIL 1100 AM CDT

* RAINFALL ESTIMATES OF 2 TO 5 INCHES OCCURRED IN A SHORT DURATION   
  ACROSS CENTRAL CASS COUNTY. 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...CASSELTON...
  HARWOOD...MAPLETON...ABSARAKA...AMENIA...ARGUSVILLE AND PROSPER.

THE FOLLOWING STREAMS ARE INCLUDED IN THE WARNING...RED RIVER OF THE
NORTH...SWAN CREEK...SHEYENNE RIVER...BUFFALO CREEK...RUSH RIVER AND
MAPLE RIVER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND DONT DROWN. AVOID DRIVING ON FLOODED ROADS. MOST FLOOD
RELATED DEATHS OCCUR IN AUTOMOBILES.

&&

LAT...LON 4685 9752 4701 9751 4708 9684 4690 9682
      4690 9687 4682 9687

$$

TG

1 follow-up statement

702 
WGUS73 KFGF 191516
FFSFGF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1016 AM CDT TUE JUL 19 2011

NDC017-191531-
/O.CAN.KFGF.FF.W.0008.000000T0000Z-110719T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CASS ND-
1016 AM CDT TUE JUL 19 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL CASS COUNTY
IN SOUTHEAST NORTH DAKOTA...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND DONT DROWN. AVOID DRIVING ON FLOODED ROADS. MOST FLOOD
RELATED DEATHS OCCUR IN AUTOMOBILES.

&&

LAT...LON 4685 9752 4701 9751 4708 9684 4690 9682
      4690 9687 4682 9687

$$

VG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 2:25 AM CDT	Severe Thunderstorm Warning	FGF	Cass	65 min
Jul 19, 2:57 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Traill	63 min
Jul 19, 3:29 AM CDT	Severe Thunderstorm Warning	FGF	Cass	61 min
Jul 19, 3:52 AM CDT	Tornado Warning	FGF	Cass	38 min
Jul 19, 4:17 AM CDT	Areal Flood Advisory	FGF	Cass	6 hr
Jul 19, 5:14 AM CDT	Flash Flood Warning	FGF	Cass	5 hr
Jul 19, 5:45 AM CDT	Flash Flood Warning	FGF	Cass	5 hr
Jul 19, 8:52 AM CDT	River Flood Warning	FGF	Cass	6 days
Jul 19, 8:52 AM CDT	River Flood Warning	FGF	Cass	6 days
Jul 19, 8:52 AM CDT	River Flood Warning	FGF	Cass	50 hr

Nearby

Flash Flood Warnings in North Dakota, 2011 Every flash flood warning in 2011

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.