Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 14, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 16, 1987, 10:58 PM CDT for Pennington County, Polk County, Red Lake County, Minnesota; Grand Forks County, North Dakota. It was in force for 62 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 16, 1987, 10:58 PM CDT (03:58 UTC)
- Expired
- Jul 17, 1987, 12:00 AM CDT
- In force
- 62 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
Counties Pennington County, MN, Polk County, MN, Red Lake County, MN, Grand Forks County, ND
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 16, 11:00 PM CDT | Hail 2.75 | Polk, MN | |
| Jul 16, 11:00 PM CDT | Hail 2.75 | Polk, MN |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
International Fa, MN (KINL), launched 00:00Z, 4.0 hours before the alert went out and 248 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
- 1601 J/kg
- Mixed-layer CIN
- -143 J/kg
- Mixed-layer LCL
- 1339 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 275 m²/s²
- 0-3 km storm-relative helicity
- 548 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 6.5
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What 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.
In the hours before
Special weather statement, Jul 16, 9:48 PM CDT, 1 hour 10 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE FARGO ND 945 PM CDT THU JUL 16 1987 ...THUNDERSTORMS DEVELOPING RADIDLY OVER NORTHEAST NORTH DAKOTA... AT 945 PM A STRONG THUNDERSTORM WAS LOCATED JUST SOUTHWEST OF GRAND FORKS NORTH DAKOTA MOVING TOWARD THE NORTHEAST AT 30 MILES AN HOUR. THIS THUNDERSTORM SHOULD PASS OVER GRAND FORKS NORTH DAKOTA AND CONTINUE ON NORTHEAST AND WILL BE IN THE THIEF RIVER FALLS AREA BY 1030 PM. THIS TH[UNDERSTORM COULD PRODUCE BRIEF HEAVY RAIN..SMALL HAIL AND GUSTY SURFACE WINDS. OTHER THUNDERSTORMS WERE LOCATED OVER CENTRAL AND EAST CENTRAL NORTH DAKOTA..ALSO MOVING NORTHEAST AT 30 MILES AN HOUR. ANDERSEN
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 16, 10:02 PM CDT | Severe Thunderstorm Warning | FGF | Marshall, Polk | 58 min |
| Jul 17, 3:40 AM CDT | Severe Thunderstorm Warning | FGF | Beltrami | 30 min |
| Jul 17, 4:10 AM CDT | Severe Thunderstorm Warning | FGF | Koochiching | 50 min |
| Jul 17, 2:50 AM CDT | Severe Thunderstorm Warning | FGF | Cass, Steele, Traill | 55 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 1987Severe Thunderstorm Warnings in North Dakota, 1987Every severe thunderstorm warning in 1987
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.