Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 245, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 9, 2020, 4:38 PM CDT for 7 counties in Minnesota. It was in force for 52 min. 2 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
- Aug 9, 2020, 4:38 PM CDT (21:38 UTC)
- Expired
- Aug 9, 2020, 5:30 PM CDT
- In force
- 52 min
- Issued by
- NWS Grand Forks, ND
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Becker County, MN, Beltrami County, MN, Clearwater County, MN, Hubbard County, MN, Mahnomen County, MN, Norman County, MN, Polk County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 174 km from the middle of the area, began a volume at 21:38 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 9, 4:50 PM CDT | HAIL 1 | Becida, MN | LASTED ABOUT 10 MINTUES. MAINLY PEA TO NICKEL SIZE, BUT A FEW STONES WHERE THE SIZE OF A QUARTER. |
| Aug 9, 5:30 PM CDT | TSTM WND DMG | 7 S Bemidji, MN | A COUPLE LARGER BRANCHES BROUGHT DOWN BY THE WIND. THESE WHERE ABOUT 3-4 INCHES IN DIAMETER. |
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 2 storm reports to this severe thunderstorm warning; the first came 12 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 9, 12:18 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
International Fa, MN (KINL), launched 12:00Z, 9.6 hours before the alert went out and 177 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
- 2237 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 53 m²/s²
- 0-3 km storm-relative helicity
- 97 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
448
WUUS53 KFGF 092138
SVRFGF
MNC005-007-029-057-087-107-119-092230-
/O.NEW.KFGF.SV.W.0245.200809T2138Z-200809T2230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Forks ND
438 PM CDT Sun Aug 9 2020
The National Weather Service in Grand Forks has issued a
* Severe Thunderstorm Warning for...
Hubbard County in north central Minnesota...
Northeastern Norman County in northwestern Minnesota...
Southeastern Polk County in northwestern Minnesota...
Southeastern Beltrami County in north central Minnesota...
Mahnomen County in northwestern Minnesota...
Northeastern Becker County in northwestern Minnesota...
Clearwater County in northwestern Minnesota...
* Until 530 PM CDT.
* At 435 PM CDT, severe thunderstorms were located along a line
extending from near Nebish to near Plantagenet Lake to Itasca State
Park, moving southeast at 50 mph.
HAZARD...70 mph wind gusts and penny size hail.
SOURCE...Trained weather spotters report mature trees blown down 4
miles south of Solway.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Severe thunderstorms will be near...
Plantagenet Lake and Bemidji around 440 PM CDT.
Nary and Rosby around 445 PM CDT.
Tenstrike, Guthrie and Lake George around 450 PM CDT.
Camp Wilderness, Emmaville and Hines around 455 PM CDT.
Akeley around 510 PM CDT.
Other locations impacted by these severe thunderstorms include Camp
Thunderbird East and Camp Thunderbird West. There will be an
additional thunderstorm capable of winds up to 70 mph moving through
the area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4741 9467 4697 9466 4726 9618 4763 9608
4785 9494 4775 9442 4741 9442
TIME...MOT...LOC 2135Z 294DEG 44KT 4779 9490 4743 9498 4719 9530
HAIL...0.75IN
WIND...70MPH
$$
TG3 follow-up statements
419
WWUS53 KFGF 092155
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
455 PM CDT Sun Aug 9 2020
MNC005-007-029-057-087-107-119-092230-
/O.CON.KFGF.SV.W.0245.000000T0000Z-200809T2230Z/
Hubbard MN-Norman MN-Polk MN-Beltrami MN-Mahnomen MN-Becker MN-
Clearwater MN-
455 PM CDT Sun Aug 9 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR HUBBARD...NORTHEASTERN NORMAN...SOUTHEASTERN POLK...SOUTHEASTERN
BELTRAMI...MAHNOMEN...NORTHEASTERN BECKER AND CLEARWATER COUNTIES...
At 454 PM CDT, severe thunderstorms were located along a line
extending from near Hines to near Rosby to near Lake George, moving
east at 45 mph. There are additional storms that will move through
this area capable of severe wind gusts.
HAZARD...70 mph wind gusts and penny size hail.
SOURCE...Trained weather spotters reported trees blown over.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
These severe storms will be near...
Tenstrike around 455 PM CDT.
Blackduck and Hines around 500 PM CDT.
Kabekona around 505 PM CDT.
Laporte around 510 PM CDT.
Benedict around 515 PM CDT.
Other locations impacted by these severe thunderstorms include Camp
Thunderbird East and Camp Thunderbird West.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4741 9467 4697 9466 4726 9618 4763 9608
4785 9494 4775 9442 4741 9442
TIME...MOT...LOC 2154Z 287DEG 38KT 4777 9465 4741 9474 4717 9506
HAIL...0.75IN
WIND...70MPH
$$
TG127
WWUS53 KFGF 092216
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
516 PM CDT Sun Aug 9 2020
MNC107-092226-
/O.CAN.KFGF.SV.W.0245.000000T0000Z-200809T2230Z/
Norman MN-
516 PM CDT Sun Aug 9 2020
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NORMAN COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
north central and northwestern Minnesota.
LAT...LON 4741 9467 4697 9466 4711 9541 4765 9596
4785 9494 4775 9442 4741 9442
TIME...MOT...LOC 2216Z 281DEG 42KT 4746 9510 4708 9513
$$
MNC005-007-029-057-087-119-092230-
/O.CON.KFGF.SV.W.0245.000000T0000Z-200809T2230Z/
Hubbard MN-Polk MN-Beltrami MN-Mahnomen MN-Becker MN-Clearwater MN-
516 PM CDT Sun Aug 9 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR HUBBARD...SOUTHEASTERN POLK...SOUTHEASTERN BELTRAMI...
NORTHEASTERN MAHNOMEN...NORTHEASTERN BECKER AND CLEARWATER
COUNTIES...
At 516 PM CDT, severe thunderstorms were located along a line
extending from near Solway to near Two Inlets, moving east at 50 mph.
HAZARD...70 mph wind gusts and penny size hail.
SOURCE...Trained weather spotters.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
These severe storms will be near...
Wilton around 520 PM CDT.
Emmaville, Plantagenet Lake and Camp Wilderness around 525 PM CDT.
Lavinia and Lake Bemidji State Park around 530 PM CDT.
Rosby and Nary around 535 PM CDT.
Akeley around 540 PM CDT.
Other locations impacted by these severe thunderstorms include Camp
Thunderbird East and Camp Thunderbird West.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4741 9467 4697 9466 4711 9541 4765 9596
4785 9494 4775 9442 4741 9442
TIME...MOT...LOC 2216Z 281DEG 42KT 4746 9510 4708 9513
HAIL...0.75IN
WIND...70MPH
$$
TG836
WWUS53 KFGF 092226
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
526 PM CDT Sun Aug 9 2020
MNC005-007-029-057-087-119-092235-
/O.EXP.KFGF.SV.W.0245.000000T0000Z-200809T2230Z/
Hubbard MN-Polk MN-Beltrami MN-Mahnomen MN-Becker MN-Clearwater MN-
526 PM CDT Sun Aug 9 2020
...THE SEVERE THUNDERSTORM WARNING FOR HUBBARD...SOUTHEASTERN POLK...
SOUTHEASTERN BELTRAMI...NORTHEASTERN MAHNOMEN...NORTHEASTERN BECKER
AND CLEARWATER COUNTIES WILL EXPIRE AT 530 PM CDT...
The storms which prompted the warning have weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
north central and northwestern Minnesota.
LAT...LON 4741 9467 4697 9466 4711 9541 4765 9596
4785 9494 4775 9442 4741 9442
TIME...MOT...LOC 2225Z 294DEG 44KT 4742 9496 4704 9499
$$
TGWhat forecasters said that day
The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Aug 9, 4:06 PM CDT, 32 minutes earlier.
Area forecast discussion, Aug 9, 4:06 PM CDT, 32 minutes before
Area Forecast Discussion National Weather Service Grand Forks ND 406 PM CDT Sun Aug 9 2020 .SHORT TERM...(This evening through Monday night) Issued at 354 PM CDT Sun Aug 9 2020 Ongoing severe weather, so discussion is brief. Cold frontal system now moving across northwest MN and southeastern ND with stronger deep layer shear across northwest MN and deeper instabilities in far southeast ND into west central MN. System is progressive and expected to exit the FA through 7pm CDT. Expect northwesterly winds behind the front with a steadily clearing and drying airmass settling over the area tonight through Monday. Overnight lows should settle into the 50s, with Monday daytime highs reaching into the middle to upper 70s, under fair skies and gusty westerly blayer winds. .LONG TERM...(Tuesday through Sunday) Issued at 354 PM CDT Sun Aug 9 2020 Zonal flow sets up early in the workweek with a shortwave ridge moving across Sask Monday night, keeping the first half of the work week dry with afternoon highs in the 80s. Humidity values will be the driest on Tuesday before weak return flow sets up going into Wednesday. An upper level pattern shift will help SW flow aloft set up going into the latter part of the week as an upper low begins to wobble over nrn Alberta, bringing a more unsettled pattern to the area Wed-Sat. While afternoon highs generally stay in the 80s for the latter half of the week into the weekend, dewpoints will rise into the upper 60s to low 70s, bringing a return of humid weather to the region as PWAT values climb to around 1.25 to 1.50 inches by week's end. Can expect isolated to scattered storms through the Wed-Sat period. Sunday should see drying and clearing conditions. && .AVIATION...(For the 18Z TAFS through 18Z Monday afternoon) Issued at 1253 PM CDT Sun Aug 9 2020 Strong to severe thunderstorms are expected to continue along a cold frontal boundary extending from the Lake of the Woods down through the Fargo-Moorhead area to near Aberdeen. This system should track eastward out the FA through early evening eastern with KBJI and KFAR still seeing some impacts. Else, expect VFR conditions west of the frontal boundary, through early evening, then widespread VFR conditions overnight into MOnday... with winds turning from the west-northwest. && .FGF WATCHES/WARNINGS/ADVISORIES... ND...Severe Thunderstorm Watch 423 until 7pm CDT. MN...Severe Thunderstorm Watch 423 until 7pm CDT. SHORT TERM...Gust LONG TERM...JR/Gust AVIATION...Gust
Hazardous weather outlook, Aug 9, 4:26 AM CDT, 12 hours 12 minutes before
Hazardous Weather Outlook National Weather Service Grand Forks ND 426 AM CDT Sun Aug 9 2020 MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024- 026>030-038-039-049-052>054-100930- 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-Eddy-Nelson-Grand Forks- Griggs-Steele-Traill-Barnes-Cass-Ransom-Sargent-Richland- Western Walsh- 426 AM CDT Sun Aug 9 2020 This hazardous weather outlook is for portions of eastern North Dakota, west central and northwest Minnesota. .DAY ONE...Today and Tonight Multiple rounds of thunderstorms will be possible today. The first round will impact during the early morning hours mainly south of the I-29/Highway 10 corridor. Hail up to 1 inch and wind gusts to 60 mph will be possible. These storms will move eastward out of the area by mid-day. Additional thunderstorms will move in from western North Dakota during the late morning and into the afternoon as a cold front moves into the region. Depending on how the morning activity plays out, there is the possibility of hail up to 1 inch, wind gusts to 75 mph, and even a brief tornado spin up as a complex of thunderstorms moves across the area during the afternoon and evening. .DAYS TWO THROUGH SEVEN...Monday through Saturday Additional thunderstorm chances will be possible during the middle to later part of the work week. .SPOTTER INFORMATION STATEMENT... Spotter activation may be required.
In the hours before
Local storm report, Aug 9, 2:48 PM CDT, 1 hour 50 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
248 PM CDT SUN AUG 9 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0237 PM TSTM WND GST 11 S ROSEAU 48.69N 95.76W
08/09/2020 M66 MPH Roseau MN MESONET
PEAK WIND MEASURED AT AN NDAWN STATION AT 3 METER HEIGHT.
&&
GGUSTLocal storm report, Aug 9, 2:57 PM CDT, 1 hour 41 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
257 PM CDT SUN AUG 9 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0228 PM FUNNEL CLOUD 4 NW BLANCHARD 47.39N 97.28W
08/09/2020 Traill ND TRAINED SPOTTER
TWO FUNNELS VIEWED FROM TWO STORMS NORTHWEST OF
BLANCHARD. BOTH WERE LESS THAN A QUARTER OF THE WAY DOWN.
ORIGINAL REPORT VIA 911 CALL CENTER. PHOTO POSTED TO
SOCIAL MEDIA.
&&
GGUSTLocal storm report, Aug 9, 3:04 PM CDT, 1 hour 34 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
304 PM CDT SUN AUG 9 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0257 PM FUNNEL CLOUD 6 WNW HALSTAD 47.38N 96.94W
08/09/2020 Traill ND TRAINED SPOTTER
PERSISTENT WALL CLOUDS WITH SMALL FUNNEL LOWERING. VIEWED
TO NORTH FROM HIGHWAY 200. PHOTO AND REPORT POSTED VIA
SOCIAL MEDIA.
&&
GGUSTLocal storm report, Aug 9, 3:47 PM CDT, 51 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
347 PM CDT SUN AUG 9 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0300 PM TSTM WND GST 9 NNE MAVIE 48.27N 95.90W
08/09/2020 M59 MPH Marshall MN MESONET
PEAK WIND MEASURED AT THE AGASSIZ RAWS STATION.
&&
GGUSTSpecial weather statement, Aug 9, 4:24 PM CDT, 14 minutes before
Special Weather Statement
National Weather Service Grand Forks ND
424 PM CDT Sun Aug 9 2020
NDZ052-092200-
Sargent ND-
424 PM CDT Sun Aug 9 2020
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN SARGENT COUNTY UNTIL
500 PM CDT...
At 424 PM CDT, Doppler radar was tracking a strong thunderstorm near
Cogswell, or 59 miles west of Wahpeton, moving east at 15 mph.
Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.
This strong thunderstorm will be near...
Cogswell around 430 PM CDT.
Brampton around 435 PM CDT.
Forman around 455 PM CDT.
Rutland and Havana around 500 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
southeastern North Dakota.
LAT...LON 4595 9801 4616 9801 4617 9800 4620 9800
4618 9744 4595 9756
TIME...MOT...LOC 2124Z 274DEG 14KT 4606 9782
DJRLocal storm report, Aug 9, 4:36 PM CDT, 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
436 PM CDT SUN AUG 9 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0427 PM TSTM WND DMG 5 S SOLWAY 47.45N 95.13W
08/09/2020 Beltrami MN EMERGENCY MNGR
MATURE TREES BLOWN DOWN.
&&
GGUSTThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 4:36 AM CDT | Special Weather Statement | FGF | Grant, Wilkin | 54 min |
| Aug 9, 4:55 AM CDT | Special Weather Statement | FGF | Otter Tail | 65 min |
| Aug 9, 5:49 AM CDT | Special Weather Statement | FGF | Becker, Wadena | 56 min |
| Aug 9, 7:10 AM CDT | Special Weather Statement | FGF | Norman | 65 min |
| Aug 9, 8:41 AM CDT | Special Weather Statement | FGF | Lake of the Woods | 64 min |
| Aug 9, 12:21 PM CDT | Severe Thunderstorm Warning | FGF | Kittson, Marshall | 54 min |
| Aug 9, 1:08 PM CDT | Severe Thunderstorm Warning | FGF | Kittson, Roseau | 67 min |
| Aug 9, 1:39 PM CDT | Severe Thunderstorm Warning | FGF | Marshall, Polk | 66 min |
| Aug 9, 2:01 PM CDT | Tornado Warning | FGF | Marshall, Pennington, Polk | 44 min |
| Aug 9, 2:05 PM CDT | Severe Thunderstorm Warning | FGF | Marshall, Pennington, Polk, Red Lake | 55 min |
| Aug 9, 2:10 PM CDT | Severe Thunderstorm Warning | FGF | Norman, Polk, Red Lake | 65 min |
| Aug 9, 2:20 PM CDT | Tornado Warning | FGF | Beltrami, Marshall | 40 min |
| Aug 9, 2:42 PM CDT | Tornado Warning | FGF | Beltrami, Clearwater, Marshall, Pennington, Polk, Red Lake | 48 min |
| Aug 9, 2:49 PM CDT | Severe Thunderstorm Warning | FGF | Beltrami, Lake of the Woods, Marshall, Roseau | 56 min |
| Aug 9, 2:52 PM CDT | Severe Thunderstorm Warning | FGF | Clay, Norman | 53 min |
| Aug 9, 2:57 PM CDT | Tornado Warning | FGF | Beltrami, Marshall | 33 min |
| Aug 9, 3:06 PM CDT | Tornado Warning | FGF | Lake of the Woods, Roseau | 24 min |
| Aug 9, 3:12 PM CDT | Severe Thunderstorm Warning | FGF | Polk, Red Lake | 63 min |
| Aug 9, 3:18 PM CDT | Severe Thunderstorm Warning | FGF | Beltrami, Clearwater, Lake of the Woods, Marshall, Pennington, Polk and 2 more | 57 min |
| Aug 9, 3:20 PM CDT | Severe Thunderstorm Warning | FGF | Clay | 22 min |
| Aug 9, 3:35 PM CDT | Tornado Warning | FGF | Clay, Norman | 18 min |
| Aug 9, 3:41 PM CDT | Severe Thunderstorm Warning | FGF | Beltrami, Clearwater, Hubbard, Mahnomen, Norman, Polk and 1 more | 64 min |
| Aug 9, 3:47 PM CDT | Tornado Warning | FGF | Lake of the Woods | 28 min |
| Aug 9, 3:53 PM CDT | Severe Thunderstorm Warning | FGF | Becker, Clay, Clearwater, Hubbard, Mahnomen, Norman | 48 min |
| Aug 9, 5:28 PM CDT | Special Weather Statement | FGF | Hubbard | 32 min |
| Aug 9, 5:31 PM CDT | Severe Thunderstorm Warning | FGF | Hubbard | 29 min |
| Aug 9, 5:33 PM CDT | Special Weather Statement | FGF | Clearwater | 57 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2020Every severe thunderstorm warning in 2020
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.