Alert archive / North Dakota / Flash Flood Warnings in 2010
Flash Flood Warning 29, NWS Grand Forks, ND
NWS Grand Forks, ND issued this flash flood warning at Aug 12, 2010, 9:31 PM CDT for Ransom County, North Dakota. It was in force for 12 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
- Aug 12, 2010, 9:31 PM CDT (02:31 UTC)
- Expired
- Aug 13, 2010, 10:00 AM CDT
- In force
- 12 hr
- Issued by
- NWS Grand Forks, ND
- Area
- Storm-based polygon
- Flood severity
- None
County Ransom County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 114 km from the middle of the area, began a volume at 02:32 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 12, 9:45 PM CDT | FLASH FLOOD | 4 N Fort Ransom, ND | EM REPORTS TRUCK STUCK IN WASHED OUT COUNTY ROAD... LAW ENFORCEMENT NEEDED TO RESCUE...LOCATION IS ESTIMATED. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this flash flood warning; the first came 14 minutes after it went out.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 2.5 hours before the alert went out and 190 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.
- Mixed-layer CAPE
- 5023 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 1129 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 2.4
- Supercell composite
- 14.8
The text
As transmitted, in the capitals the NWS used until 2016.
917 WGUS53 KFGF 130231 FFWFGF NDC073-131500- /O.NEW.KFGF.FF.W.0029.100813T0231Z-100813T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 931 PM CDT THU AUG 12 2010 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * FLASH FLOOD WARNING FOR... RANSOM COUNTY IN SOUTHEAST NORTH DAKOTA... * UNTIL 1000 AM CDT FRIDAY * AT 925 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS NORTHWEST RANSOM COUNTY MOVING EAST ACROSS THE COUNTY. RADAR ESTIMATED TWO TO THREE INCHES OF RAIN FELL OVER NORTHWEST RANSOM COUNTY. THE RAIN WILL ALSO FALL IN AN AREA WHERE HEAVY RAIN FELL THIS MORNING AND EARLY AFTERNOON. THUNDERSTORMS WILL CONTINUE TO MOVE ACROSS RANSOM COUNTY THIS EVENING. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... ENDERLIN...LISBON...ANSELM...ELLIOTT...ENGLEVALE...FORT RANSOM AND SHELDON. THE FOLLOWING STREAMS ARE INCLUDED IN THE WARNING...SHEYENNE RIVER... MAPLE RIVER...SOUTH BRANCH MAPLE RIVER AND BEAR CREEK. PRECAUTIONARY/PREPAREDNESS ACTIONS... BE ESPECIALLY CAUTIOUS AT NIGHT WHEN THE DANGERS OF FLASH FLOODING ARE HARD TO RECOGNIZE. && LAT...LON 4663 9729 4638 9731 4632 9802 4662 9803 $$ HOPPES
2 follow-up statements
441 WGUS73 KFGF 130542 FFSFGF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 1242 AM CDT FRI AUG 13 2010 NDC073-131500- /O.CON.KFGF.FF.W.0029.000000T0000Z-100813T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ RANSOM ND- 1242 AM CDT FRI AUG 13 2010 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1000 AM CDT FOR RANSOM COUNTY... WEATHER SERVICE DOPPLER RADAR INDICATED HEAVY RAIN FELL ACROSS RANSOM COUNTY THURSDAY. THE RAIN HAS SINCE MOVED OUT OF THE AREA. HOWEVER ADDITIONAL RAIN WILL BE POSSIBLE FRIDAY MORNING. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...ENDERLIN...LISBON...ANSELM...ENGLEVALE...FORT RANSOM...VENLO AND SHELDON. THE FOLLOWING STREAMS ARE INCLUDED IN THE WARNING...SHEYENNE RIVER... MAPLE RIVER...SOUTH BRANCH MAPLE RIVER AND BEAR CREEK. PRECAUTIONARY/PREPAREDNESS ACTIONS... BE ESPECIALLY CAUTIOUS AT NIGHT WHEN THE DANGERS OF FLASH FLOODING ARE HARD TO RECOGNIZE. && LAT...LON 4663 9729 4638 9731 4632 9802 4662 9803 $$ HOPPES
789 WGUS73 KFGF 131457 FFSFGF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 956 AM CDT FRI AUG 13 2010 NDC073-131511- /O.EXP.KFGF.FF.W.0029.000000T0000Z-100813T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ RANSOM ND- 956 AM CDT FRI AUG 13 2010 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 1000 AM CDT FOR RANSOM COUNTY... 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... REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT OFFICIALS. && LAT...LON 4663 9729 4638 9731 4632 9802 4662 9803 $$ JK
What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Forks, ND wrote its last area forecast discussion before this flash flood warning went out at Aug 12, 9:05 PM CDT, 26 minutes earlier.
Area forecast discussion, Aug 12, 9:05 PM CDT, 26 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND FORKS ND 905 PM CDT THU AUG 12 2010 .DISCUSSION...FORECAST CHALLENGE CONCERNS CONTINUED SEVERE STORM AND HEAVY RAIN THREAT. SURFACE LOW REMAINS ALONG ND/SD BORDER N OF ABR. ASSOCIATED WARM FRONT WHICH WAS HUGGING ND/SD BORDER AREA HAS SAGGED SOUTH INTO NE SD AND THEN INTO S MN. A COUPLE OF SEVERE/POTENTIALLY TORNADIC STORMS CONTINUE NORTH OF BOUNDARY ACROSS RANSOM AND RICHLAND COUNTY. ELSEWHERE BAND OF MODERATE TO LOCALLY HEAVY RAINFALL WITH ELEVATED STORMS ON NOSE OF LOW LEVEL JET CONTINUE ACROSS EAST CENTRAL ND. THIS BAND BEGINNING TO SAG SOUTH AND EAST AND INCREASE IN FORWARD SPEED AS LOW LEVEL JET INTENSIFIES ACROSS NE SD AND SHORTWAVE SHIFTS EAST. WITH PRECIPITABLE H20 VALUES REMAINING AROUND 1/5 INCH WILL NEED TO MAINTAIN WATCH FOR ANY FURTHER FLOOD HEADLINES. ONGOING CONVECTION FARTHER WEST HOWEVER WITH LOW LEVEL JET SHIFTING EAST ACROSS MN NOT SURE HOW LONG HIGH PLAINS CONVECTION WILL HOLD TOGETHER. DEWPOINTS UPSTREAM REMAIN IN THE 60S SO ANOTHER MILD NIGHT. && .AVIATION...STRONG TO SEVERE THUNDERSTORMS WILL CONTINUE TO PUSH ESE ACROSS SE ND...NW AND WEST CENTRAL MN. && .FGF WATCHES/WARNINGS/ADVISORIES... ND...NONE. MN...NONE. && VOELKER
Hazardous weather outlook, Aug 12, 6:22 AM CDT, 15 hours 9 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND FORKS ND 622 AM CDT THU AUG 12 2010 MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024- 026>030-038-039-049-052>054-131130- WEST POLK-NORMAN-CLAY-KITTSON-ROSEAU-LAKE OF THE WOODS- WEST MARSHALL-EAST MARSHALL-NORTH BELTRAMI-PENNINGTON-RED LAKE- EAST POLK-NORTH CLEARWATER-SOUTH BELTRAMI-MAHNOMEN- SOUTH CLEARWATER-HUBBARD-WEST BECKER-EAST BECKER-WILKIN- WEST OTTER TAIL-EAST OTTER TAIL-WADENA-GRANT-TOWNER-CAVALIER- PEMBINA-BENSON-RAMSEY-EASTERN WALSH COUNTY-EDDY-NELSON- GRAND FORKS-GRIGGS-STEELE-TRAILL-BARNES-CASS-RANSOM-SARGENT- RICHLAND-WESTERN WALSH COUNTY- 622 AM CDT THU AUG 12 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN NORTH DAKOTA...WEST CENTRAL AND NORTHWEST MINNESOTA. .DAY ONE...TODAY AND TONIGHT STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED LATE TODAY...AND BECOME MORE WIDESPREAD TONIGHT. MORNING SHOWERS AND THUNDERSTORMS WILL DIMINISH...WITH MIXED CLOUDS AND SUNSHINE THIS AFTERNOON. DEPENDING ON SUNSHINE...TEMPERATURES SHOULD WARM WELL INTO THE 80S. IF THIS DOES OCCUR...THESE TEMPERATURES COMBINED WITH HIGH MOISTURE VALUES WILL CAUSE HIGH INSTABILITY VALUES BY LATE TODAY AND THIS EVENING. THIS WILL SET THE STAGE FOR SCATTERED STRONG TO SEVERE THUNDERSTORM DEVELOPMENT. ACTIVITY SHOULD INCREASE IN COVERAGE OVERNIGHT AS A LOW LEVEL JET RESIDES NEAR THE AREA. HEAVY RAINFALL...HAIL AND STRONG DAMAGING WINDS ARE ALL POSSIBLE. THERE IS ALSO THE THREAT FOR TORNADOES MAINLY NEAR THE NORTH DAKOTA...SOUTH DAKOTA...AND MINNESOTA BORDER REGION. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY SCATTERED STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE FRIDAY...MAINLY OVER WEST CENTRAL MINNESOTA. THE WEEKEND WILL BE MUCH COOLER WITH SCATTERED SHOWERS AND ISOLATED NON-SEVERE THUNDERSTORMS...MAINLY FOR AREAS ALONG THE CANADIAN BORDER. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED. DTR
In the hours before
Special weather statement, Aug 12, 6:02 PM CDT, 3 hours 29 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 602 PM CDT THU AUG 12 2010 NDZ028-029-038-130000- BARNES ND-GRIGGS ND-STEELE ND- 602 PM CDT THU AUG 12 2010 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN BARNES...STEELE AND EASTERN GRIGGS COUNTIES UNTIL 700 PM CDT... AT 559 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING AN AREA OF THUNDERSTORMS 12 MILES SOUTH OF COOPERSTOWN...OR 25 MILES NORTH OF VALLEY CITY...MOVING TO THE NORTH AT 20 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THE STORM...ALONG WITH HEAVY RAIN. THE STORM WILL BE NEAR... HOPE AROUND 615 PM CDT. BLABON AROUND 635 PM CDT. COOPERSTOWN AROUND 640 PM CDT. SHERBROOKE AROUND 645 PM CDT. BE PREPARED TO TAKE SHELTER IF THE STORMS INTENSIFY AND BECOME SEVERE...OR A WARNING IS ISSUED BY THE NATIONAL WEATHER SERVICE. TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. JK
Special weather statement, Aug 12, 6:22 PM CDT, 3 hours 9 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 622 PM CDT THU AUG 12 2010 MNZ040-130015- GRANT MN- 622 PM CDT THU AUG 12 2010 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN GRANT COUNTY UNTIL 715 PM CDT... AT 617 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING THUNDERSTORMS ALONG A LINE EXTENDING FROM 8 MILES NORTH OF HOFFMAN TO 16 MILES SOUTH OF CHARLESVILLE...MOVING TO THE EAST AT 15 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THE STORMS...ALONG WITH HEAVY RAIN AND FREQUENT LIGHTNING. THE STORMS WILL BE NEAR... HOFFMAN AROUND 715 PM CDT. BE PREPARED TO TAKE SHELTER IF THE STORMS INTENSIFY AND BECOME SEVERE...OR A WARNING IS ISSUED BY THE NATIONAL WEATHER SERVICE. TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. JK
Special weather statement, Aug 12, 7:06 PM CDT, 2 hours 25 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 706 PM CDT THU AUG 12 2010 NDZ049-052-053-130100- RANSOM ND-RICHLAND ND-SARGENT ND- 706 PM CDT THU AUG 12 2010 ...SIGNIFICANT WEATHER ADVISORY FOR EASTERN SARGENT...WESTERN RICHLAND AND EXTREME SOUTHEASTERN RANSOM COUNTIES UNTIL 800 PM CDT... AT 703 PM CDT...THE PUBLIC REPORTED A THUNDERSTORM 10 MILES EAST OF FORMAN...OR 24 MILES NORTHEAST OF BRITTON...MOVING TO THE NORTHEAST AT 20 MPH. HAIL UP TO THE SIZE OF PENNIES HAS BEEN REPORTED WITH THIS STORM...ALONG WITH FREQUENT LIGHTNING. THE STORM WILL BE NEAR... CAYUGA AROUND 715 PM CDT. GENESEO AROUND 725 PM CDT. HAMLIN AROUND 740 PM CDT. WYNDMERE AND BARNEY AROUND 800 PM CDT. BE PREPARED TO TAKE SHELTER IF THE STORMS INTENSIFY AND BECOME SEVERE...OR A WARNING IS ISSUED BY THE NATIONAL WEATHER SERVICE. JK
Local storm report, Aug 12, 8:43 PM CDT, 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
843 PM CDT THU AUG 12 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0834 PM TORNADO 1 S GENESEO 46.06N 97.28W
08/12/2010 SARGENT ND PUBLIC
&&
JHLocal storm report, Aug 12, 9:07 PM CDT, 24 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
907 PM CDT THU AUG 12 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0900 PM TSTM WND GST WEST FARGO 46.87N 96.90W
08/12/2010 E60 MPH CASS ND TRAINED SPOTTER
ALSO DIME SIZE HAIL
&&
JHLocal storm report, Aug 12, 9:18 PM CDT, 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
918 PM CDT THU AUG 12 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0906 PM TSTM WND GST FARGO 46.88N 96.82W
08/12/2010 M67.00 MPH CASS ND TRAINED SPOTTER
IN SOUTH FARGO
&&
JHThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 7:37 PM CDT | Tornado Warning | FGF | Sargent | 53 min |
| Aug 12, 7:49 PM CDT | Tornado Warning | FGF | Ransom | 56 min |
| Aug 12, 8:30 PM CDT | Tornado Warning | FGF | Richland, Sargent | 45 min |
| Aug 12, 8:44 PM CDT | Tornado Warning | FGF | Ransom | 61 min |
| Aug 12, 8:50 PM CDT | Severe Thunderstorm Warning | FGF | Cass, Traill | 55 min |
| Aug 12, 9:47 PM CDT | Severe Thunderstorm Warning | FGF | Ransom, Richland, Sargent | 58 min |
| Aug 12, 10:34 PM CDT | Severe Thunderstorm Warning | FGF | Cass, Richland | 56 min |
| Aug 13, 1:25 AM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass, Griggs, Steele | 65 min |
Nearby
Flash Flood Warnings in North Dakota, 2010Every flash flood warning in 2010
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.