Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 97, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 20, 2011, 7:24 AM CDT for Kittson County, Marshall County, Roseau County, Minnesota. It was in force for 51 min. 10 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
- Jul 20, 2011, 7:24 AM CDT (12:24 UTC)
- Expired
- Jul 20, 2011, 8:15 AM CDT
- In force
- 51 min
- Issued by
- NWS Grand Forks, ND
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Kittson County, MN, Marshall County, MN, Roseau County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 124 km from the middle of the area, began a volume at 12:26 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 20, 7:27 AM CDT | TSTM WND GST 78.1 | 8 Ene Stephen, MN | MEASURED WIND GUST AT THE STEPHEN NDAWN. |
| Jul 20, 7:30 AM CDT | TSTM WND DMG | 4 Ene Stephen, MN | GRAIN BIN TIPPED OVER. |
| Jul 20, 7:30 AM CDT | TSTM WND DMG | Florian, MN | LARGE TREE DOWN |
| Jul 20, 7:30 AM CDT | TSTM WND DMG | Karlstad, MN | COUNTY HIGHWAY DEPARTMENT BUILDING SEVERELY DAMAGED. EQUIPMENT IN BUILDING ALSO DAMAGED. TIME APPROXIMATE. |
| Jul 20, 7:30 AM CDT | TORNADO | Karlstad, MN | TORNADO REPORTED BY PUBLIC. VERIFIED AND RELAYED BY THE KARLSTAD FIRE DEPARTMENT. TORNADO TRAVELED DOWN HIGHWAY 11 CAUSING DAMAGE IN KARLSTAD. TIME APPROXIMATE. |
| Jul 20, 7:38 AM CDT | TSTM WND GST 60 | Karlstad, MN | |
| Jul 20, 7:40 AM CDT | TSTM WND DMG | Karlstad, MN | 6 INCH DIAMETER TREE SECTIONS BROKEN OFF 3 TO 4 FEET UP ON TRUNKS. |
| Jul 20, 7:48 AM CDT | TSTM WND GST 65 | Greenbush, MN | 6 TO 8 INCH DIAMETER TREES FELLED |
| Jul 20, 8:00 AM CDT | TSTM WND DMG | Greenbush, MN | TREES BLOWN DOWN ON CARS IN TOWN. EMPTY GRAIN BIN ROLLED. |
| Jul 20, 8:07 AM CDT | TSTM WND DMG | Greenbush, MN | EXTENSIVE TREE AND HOUSE DAMAGE IN GREENBUSH. TIME APPROXIMATE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 20, 5:25 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
International Fa, MN (KINL), launched 12:00Z, 0.4 hours before the alert went out and 234 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
- 3428 J/kg
- Mixed-layer CIN
- -134 J/kg
- Mixed-layer LCL
- 477 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 188 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.5
The text
As transmitted, in the capitals the NWS used until 2016.
577 WUUS53 KFGF 201224 SVRFGF MNC069-089-135-201315- /O.NEW.KFGF.SV.W.0097.110720T1224Z-110720T1315Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 724 AM CDT WED JUL 20 2011 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN KITTSON COUNTY IN NORTHWEST MINNESOTA... WESTERN MARSHALL COUNTY IN NORTHWEST MINNESOTA... SOUTHWESTERN ROSEAU COUNTY IN NORTHWEST MINNESOTA... * UNTIL 815 AM CDT * AT 721 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THE STORM WAS LOCATED 4 MILES NORTHWEST OF ARGYLE...OR 25 MILES EAST OF GRAFTON...MOVING TO THE EAST AT 45 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... RADIUM...FLORIAN AND ENGLUND AROUND 735 AM CDT. OLD MILL STATE PARK AND HALMA AROUND 740 AM CDT. KARLSTAD AND STRANDQUIST AROUND 745 AM CDT. VIKING AROUND 750 AM CDT. THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM INCLUDE ROSEWOOD AND GREENBUSH. THIS THUNDERSTORM IS PRODUCING FREQUENT LIGHTNING. PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. && LAT...LON 4872 9611 4817 9601 4818 9702 4862 9710 TIME...MOT...LOC 1224Z 267DEG 38KT 4839 9681 WIND...HAIL 60MPH 1.00IN $$ GROCHOCINSKI
2 follow-up statements
836 WWUS53 KFGF 201242 SVSFGF SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 742 AM CDT WED JUL 20 2011 MNC069-089-135-201315- /O.CON.KFGF.SV.W.0097.000000T0000Z-110720T1315Z/ KITTSON MN-ROSEAU MN-MARSHALL MN- 742 AM CDT WED JUL 20 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL MARSHALL...SOUTHWESTERN ROSEAU AND SOUTHEASTERN KITTSON COUNTIES IN NORTHWEST MINNESOTA UNTIL 815 AM CDT... AT 739 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THE STORM WAS LOCATED NEAR OLD MILL STATE PARK...OR 26 MILES NORTHWEST OF THIEF RIVER FALLS...MOVING TO THE EAST AT 45 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... VIKING AROUND 750 AM CDT. ROSEWOOD AND NEWFOLDEN AROUND 755 AM CDT. HOLT AROUND 800 AM CDT. GREENBUSH...STRATHCONA AND MIDDLE RIVER AROUND 805 AM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. && LAT...LON 4864 9695 4872 9611 4817 9601 4818 9678 TIME...MOT...LOC 1242Z 267DEG 38KT 4839 9652 $$ GROCHOCINSKI
254 WWUS53 KFGF 201252 SVSFGF SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 752 AM CDT WED JUL 20 2011 MNC069-089-135-201315- /O.CON.KFGF.SV.W.0097.000000T0000Z-110720T1315Z/ KITTSON MN-ROSEAU MN-MARSHALL MN- 752 AM CDT WED JUL 20 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL MARSHALL...SOUTHWESTERN ROSEAU AND SOUTHEASTERN KITTSON COUNTIES IN NORTHWEST MINNESOTA UNTIL 815 AM CDT... AT 749 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THE STORM WAS LOCATED 4 MILES NORTHWEST OF NEWFOLDEN...OR 21 MILES NORTHWEST OF THIEF RIVER FALLS...MOVING TO THE EAST AT 45 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... HOLT AROUND 800 AM CDT. GREENBUSH...STRATHCONA AND MIDDLE RIVER AROUND 805 AM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. && LAT...LON 4865 9680 4872 9611 4817 9601 4818 9652 TIME...MOT...LOC 1253Z 267DEG 38KT 4838 9634 $$ GROCHOCINSKI
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 6:40 AM CDT | Severe Thunderstorm Warning | FGF | Marshall, Polk | 50 min |
| Jul 20, 7:41 AM CDT | Severe Thunderstorm Warning | FGF | Kittson, Roseau | 34 min |
| Jul 20, 7:59 AM CDT | Severe Thunderstorm Warning | FGF | Beltrami, Kittson, Lake of the Woods, Marshall, Roseau | 61 min |
| Jul 20, 8:08 AM CDT | Severe Thunderstorm Warning | FGF | Kittson, Marshall | 67 min |
| Jul 20, 8:27 AM CDT | Tornado Warning | FGF | Roseau | 48 min |
| Jul 20, 8:58 AM CDT | Severe Thunderstorm Warning | FGF | Lake of the Woods, Roseau | 47 min |
| Jul 20, 8:59 AM CDT | Areal Flood Advisory | FGF | Beltrami, Kittson, Lake of the Woods, Marshall, Roseau | 6 hr |
| Jul 20, 9:16 AM CDT | Severe Thunderstorm Warning | FGF | Lake of the Woods, Roseau | 44 min |
| Jul 20, 10:49 AM CDT | River Flood Watch | FGF | Polk | 47 hr |
| Jul 20, 10:49 AM CDT | River Flood Watch | FGF | Marshall, Polk | 47 hr |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2011Every severe thunderstorm 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.