Alert archive / Minnesota / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 21, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at May 21, 2007, 6:15 PM CDT for Polk County, Minnesota. It was in force for 60 min. 3 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
- May 21, 2007, 6:15 PM CDT (23:15 UTC)
- Expired
- May 21, 2007, 7:15 PM CDT
- In force
- 60 min
- Issued by
- NWS Grand Forks, ND
- Area
- Counties, with a storm outline in the text
County Polk County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 108 km from the middle of the area, began a volume at 23:16 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 |
|---|---|---|---|
| May 21, 6:20 PM CDT | HAIL 1 | 4 Ne Winger, MN | |
| May 21, 6:55 PM CDT | HAIL 0.75 | Mcintosh, MN | |
| May 21, 6:55 PM CDT | HAIL 1 | Fosston, MN |
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 12:00Z, 11.3 hours before the alert went out and 222 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 690 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 173 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS53 KFGF 212315 SVRFGF MNC119-220015- /O.NEW.KFGF.SV.W.0021.070521T2315Z-070522T0015Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 615 PM CDT MON MAY 21 2007 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEASTERN POLK COUNTY IN NORTHWEST MINNESOTA... * UNTIL 715 PM CDT * AT 607 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THE STORM WAS LOCATED 3 MILES SOUTHEAST OF WINGER...OR 43 MILES SOUTH OF THIEF RIVER FALLS...MOVING TO THE NORTHEAST AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... MCINTOSH AT 630 PM CDT... FOSSTON AT 640 PM CDT... REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. LAT...LON 4751 9607 4751 9584 4765 9559 4772 9588 $$ JK
4 follow-up statements
000 WWUS53 KFGF 212338 SVSFGF SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 637 PM CDT MON MAY 21 2007 MNC119-220015- /O.CON.KFGF.SV.W.0021.000000T0000Z-070522T0015Z/ POLK MN- 637 PM CDT MON MAY 21 2007 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR SOUTHEASTERN POLK COUNTY... AT 628 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THE STORM WAS LOCATED 5 MILES SOUTHWEST OF FOSSTON...OR 42 MILES SOUTH OF THIEF RIVER FALLS...MOVING TO THE NORTHEAST AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... FOSSTON BY 645 PM CDT... OLGA AND 9 MILES SOUTH OF GULLY BY 715 PM CDT... REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT MONDAY EVENING FOR NORTHEAST NORTH DAKOTA. LAT...LON 4751 9595 4751 9564 4781 9558 4779 9581 $$ JK
000 WWUS53 KFGF 212349 SVSFGF SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 649 PM CDT MON MAY 21 2007 MNC119-220015- /O.CON.KFGF.SV.W.0021.000000T0000Z-070522T0015Z/ POLK MN- 649 PM CDT MON MAY 21 2007 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR SOUTHEASTERN POLK COUNTY... AT 641 PM CDT...LAW ENFORCEMENT REPORTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THE STORM WAS LOCATED 2 MILES SOUTHWEST OF FOSSTON...OR 42 MILES WEST OF BEMIDJI...MOVING TO THE NORTHEAST AT 10 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... OLGA BY 710 PM CDT... QUARTER INCH HAIL WAS REPORTED AT 6:20 PM 4 MILES NORTHEAST OF WINGER. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT MONDAY EVENING FOR NORTHEAST NORTH DAKOTA. LAT...LON 4751 9595 4751 9558 4781 9558 4764 9607 $$ JK
000 WWUS53 KFGF 220001 SVSFGF SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 700 PM CDT MON MAY 21 2007 MNC119-220015- /O.CON.KFGF.SV.W.0021.000000T0000Z-070522T0015Z/ POLK MN- 700 PM CDT MON MAY 21 2007 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR SOUTHEASTERN POLK COUNTY... AT 700 PM CDT...LAW ENFORCEMENT REPORTED A SEVERE THUNDERSTORM PRODUCING QUARTER SIZE HAIL IN FOSSTON AT 655 PM. THE STORM WAS LOCATED OVER MCINTOSH...OR 36 MILES SOUTHEAST OF THIEF RIVER FALLS...MOVING TO THE NORTHEAST AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE ABOUT... 6 MILES WEST OF OLGA BY 715 PM CDT... A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT MONDAY EVENING FOR NORTHEAST NORTH DAKOTA. LAT...LON 4751 9595 4751 9558 4781 9558 4764 9607 $$ JK
000 WWUS53 KFGF 220012 SVSFGF SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 711 PM CDT MON MAY 21 2007 MNC119-220021- /O.EXP.KFGF.SV.W.0021.000000T0000Z-070522T0015Z/ POLK MN- 711 PM CDT MON MAY 21 2007 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN POLK COUNTY WILL EXPIRE AT 715 PM CDT... DOPPLER RADAR INDICATED THE STORM WAS NO LONGER SEVERE AND SO THE WARNING WILL BE ALLOWED TO EXPIRE AT 715 PM CDT. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT MONDAY EVENING FOR NORTHEAST NORTH DAKOTA. LAT...LON 4751 9595 4751 9558 4781 9558 4764 9607 $$ JK
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 5:08 PM CDT | Severe Thunderstorm Warning | FGF | Clearwater, Mahnomen | 42 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2007Every severe thunderstorm warning in 2007
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.