Alert archive / North Dakota / Flash Flood Warnings in 2011

Flash Flood Warning 12, NWS Grand Forks, ND

July 23, 2011Eddy County, Nelson County, North Dakota

NWS Grand Forks, ND issued this flash flood warning at Jul 23, 2011, 1:20 AM CDT for Eddy County, Nelson County, North Dakota. It was in force for 6 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 23, 2011, 1:20 AM CDT (06:20 UTC)
Expired
Jul 23, 2011, 7:11 AM CDT
In force
6 hr
Issued by
NWS Grand Forks, ND
Area
Storm-based polygon
Flood severity
None

Counties Eddy County, ND, Nelson County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 94 km from the middle of the area, began a volume at 06:20 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

TimeReportWhereRemark
Jul 23, 3:30 AM CDTFLASH FLOOD4 Se New Rockford, NDWATER OVER COUNTY ROAD 4 SE OF NEW ROCKFORD ALONG ROCKY RUN CREEK...TIME APPROXIMATE.

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

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 6.3 hours before the alert went out and 197 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-pSkew-T log-p diagram, Bismarck Municip, ND at 00:00Z on 2011-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1986 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 00:00Z on 2011-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 97 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1986 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
1048 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
97 m²/s²
0-3 km storm-relative helicity
219 m²/s²
Significant tornado parameter
1.4
Supercell composite
7.2

Open this sounding in Storm Lab

The text

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

696 
WGUS53 KFGF 230621
FFWFGF
NDC027-063-231500-
/O.NEW.KFGF.FF.W.0012.110723T0621Z-110723T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
120 AM CDT SAT JUL 23 2011

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN NELSON COUNTY IN NORTHEAST NORTH DAKOTA...
  EDDY COUNTY IN NORTHEAST NORTH DAKOTA...

* UNTIL 1000 AM CDT

* AT 120 AM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED   
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.
DOPPLER RADAR ESTIMATES OF 3 TO 4 INCHES HAVE FALLEN IN SOUTHERN 
EDDY COUNTY...WITH ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES 
POSSIBLE.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  MCVILLE...NEW ROCKFORD...PEKIN AND TOLNA.

THE FOLLOWING STREAMS ARE INCLUDED IN THE WARNING...SHEYENNE RIVER...
COLVIN CREEK...MCVILLE COULEE...JAMES RIVER...ROCKY RUN...* WEST
STUMP LAKE * AND SILVER CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4795 9806 4772 9812 4768 9855 4762 9852
      4761 9862 4760 9925 4779 9928 4786 9836

$$
DK
2 follow-up statements
817 
WGUS73 KFGF 230924
FFSFGF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
420 AM CDT SAT JUL 23 2011

NDC027-063-231500-
/O.CON.KFGF.FF.W.0012.000000T0000Z-110723T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
EDDY ND-NELSON ND-
420 AM CDT SAT JUL 23 2011

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1000 AM CDT FOR
SOUTHWESTERN NELSON AND EDDY COUNTIES...

AT 420 AM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS
WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. DOPPLER RADAR 
RAINFALL AMOUNTS OF 3 TO 4 INCHES HAVE OCCURRED FROM JUST SOUTH OF 
NEW ROCKFORD TO NORTH OF MCVILLE. EXPECT ADDITIONAL RAINFALL AMOUNTS 
OF UP TO ONE INCH FROM SHOWERS AND THUNDERSTORMS.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
MCVILLE...NEW ROCKFORD...PEKIN AND TOLNA.

THE FOLLOWING STREAMS ARE INCLUDED IN THE WARNING...SHEYENNE RIVER...
COLVIN CREEK...MCVILLE COULEE...JAMES RIVER...ROCKY RUN...* WEST
STUMP LAKE * AND SILVER CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4795 9806 4772 9812 4768 9855 4762 9852
      4761 9862 4760 9925 4779 9928 4786 9836

$$
DK
038 
WGUS73 KFGF 231211
FFSFGF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
707 AM CDT SAT JUL 23 2011

NDC027-063-231222-
/O.CAN.KFGF.FF.W.0012.000000T0000Z-110723T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
EDDY ND-NELSON ND-
707 AM CDT SAT JUL 23 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHWESTERN NELSON
AND EDDY COUNTIES...

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

FLASH FLOODING WAS REPORTED 4 MILES SOUTHEAST OF NEW ROCKFORD ALONG 
ROCKY RUN CREEK AROUND 330 AM. THE WATER HAS RECEDED AND IS NO 
LONGER OVER THE ROAD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4795 9806 4772 9812 4768 9855 4762 9852
      4761 9862 4760 9925 4779 9928 4786 9836

$$
DK

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 12:41 AM CDTAreal Flood AdvisoryFGFEddy, Nelson6 hr
Jul 23, 1:29 AM CDTSevere Thunderstorm WarningFGFBarnes, Griggs61 min
Jul 23, 1:35 AM CDTSevere Thunderstorm WarningFGFBarnes, Griggs55 min
Jul 23, 1:51 AM CDTSevere Thunderstorm WarningFGFRansom, Sargent54 min
Jul 23, 2:22 AM CDTSevere Thunderstorm WarningFGFBarnes, Cass, Steele, Traill53 min
Jul 23, 2:39 AM CDTSevere Thunderstorm WarningFGFRansom, Richland, Sargent51 min
Jul 23, 3:01 AM CDTSevere Thunderstorm WarningFGFGrand Forks, Steele, Traill59 min
Jul 23, 3:12 AM CDTSevere Thunderstorm WarningFGFCass, Ransom, Richland, Steele, Traill63 min
Jul 23, 3:23 AM CDTSevere Thunderstorm WarningFGFRichland52 min

Nearby

Flash Flood Warnings in North Dakota, 2011Every 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.