Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 18, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 17, 1987, 7:37 PM CDT for Becker County, Minnesota. It was in force for 68 min. 1 report 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 17, 1987, 7:37 PM CDT (00:37 UTC)
- Expired
- Jul 17, 1987, 8:45 PM CDT
- In force
- 68 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
County Becker County, MN
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 17, 7:45 PM CDT | Thunderstorm Wind 0 | Becker, 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, 0.6 hours before the alert went out and 254 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
- 7 J/kg
- Mixed-layer CIN
- -214 J/kg
- Mixed-layer LCL
- 1101 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 145 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFAR 180037 SVRFAR MNC005-180145- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FARGO ND 737 PM CDT FRI JUL 17 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 845 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF NORTHWEST MINNESOTA...BECKER AT 730 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES NORTHEAST OF DETROIT LAKES MINNESOTA MOVING TOWARD THE NORTHEAST AT 30 MILES AN HOUR. RADAR INDICATED POSSIBLE LARGE HAIL WITH THIS THUNDERSTORM. THIS SLOW MOVING THUNDERSTORM MAY CAUSE FLOODING OF SMALL STREAMS AND UNDERPASSES. INTENSE LIGHTNING IS REPORTED WITH THIS STORM. IF OUTDOORS... STAY AWAY FROMl HIGH OBJECTS. MOVE INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING TELEPHONES AND ELECTRICAL EQUIPMENT. ANDERSEN
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 17, 4:38 PM CDT, 2 hours 59 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE FARGO ND 430 PM CDT FRI JUL 17 1987 ...THUNDERSTORMS FIRE-UP OVER NORTHWEST MINNESOTA... AT 426 PM CDT SEVERAL THUNDERSTORMS WITH VERY HEAVY RAIN HAD DEVELOPED QUITE RAPIDLY OVER PARTS OF NORTHWEST MINNESOTA. THE STORMS WERE 10 MILES NORTHWEST OF DETROIT LAKES AND IN A CLUSTER AROUND ITASCA STATE PARK. THESE STORMS WERE MOVING NORTHEAST AT 35 MILES AN HOUR AND SHOULD MOVE INTO THE BEMIDJI AREA BY 515 PM. THESE STORMS HAVE THE POTENTIAL TO PRODUCE HAIL..GUSTY WIND AND DANGEROUS LIGHTNING..IN ADDITION TO THE VERY HEAVY RAIN. PERSONS IN THE PATH OF THESE STORMS SHOULD BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS AND BE PREPARED TO GO TO A PLACE OF SAFETY. OTHER SHOWERS AND THUNDERSHOWERS WERE OVER THE EXTREME NORTHEAST CORNER OF NORTH DAKOTA AND OVER THE NORTH ONE-THIRD OF MINNESOTA. MOVEMENT WAS NORTHEAST AT ABOUT 35 MILES AN HOUR. BENNETT
Special weather statement, Jul 17, 5:43 PM CDT, 1 hour 54 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE FARGO ND 535 PM CDT FRI JUL 17 1987 AT 529 PM CDT AN INTENSE THUNDERSTORM WAS LOCATED ABOUT THREE MILES WEST OF ITASCA STATE PARK IN CLEARWATER COUNTY OF NORTHWEST MINNESOTA. THIS STORM WAS MOVING EAST AT ABOUT 30 MILES AN HOUR AND SHOULD MOVE JUST TO THE SOUTHEAST OF BEMIDJI BY 630 PM. OTHER THUNDERSTORMS..SOME WITH VERY HEAVY RAIN WERE FROM ABOUT 30 MILES NORTHWEST OF DETROIT LAKES TO GRAND RAPIDS..BOTH IN MINNESOTA. OTHER SHOWERS WERE OVER THE NORTH END OF THE RED RIVER VALLEY. MOVEMENT WAS EAST AT 30 MILES AN HOUR. NO REPORTS OF SEVERE WEATHER HAD BEEN RECEIVED SINCE 426 PM. BENNETT
Special weather statement, Jul 17, 6:50 PM CDT, 47 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE FARGO ND 638 PM CDT FRI JUL 17 1987 AT 629 PM CDT A CLUSTER OF INTENSE THUNDERSTORMS WAS OVER THE SOUTHEAST CORNER OF MAHNOMEN COUNTY OF NORTHWEST MINNESOTA.. ABOUT 30 MILES NORTH OF DETROIT LAKES. THESE STORMS WERE MOVING NORTHEAST AT 30 MILES AN HOUR AND SHOULD MOVE INTO THE SOUTHWEST CORNER OF CLEARWATER COUNTY BY 715 PM. REPORTS OF VERY HEAVY RAIN HAVE BEEN ASSOCIATED WITH THE STORMS OVER THIS GENERAL AREA SINCE 530 PM. NO SEVERE WEATHER HAD BEEN REPORTED. OTHER SHOWERS AND THUNDERSTORMS WITH VERY HEAVY RAIN EXTENDED FROM 30 MILES NORTH OF DETROIT LAKES TO THE NORTH OF HIBBING IN MINNESOTA. MOVEMENT WAS NORTHEAST AT 30 MILES AN HOUR. PEOPLE LIVING IN THE LOWER ELEVATIONS OF MAHNOMEN..NORTH BECKER AND SOUTH CLEARWATER COUNTIES OF NORTHWEST MINNESOTA SHOULD BE ALERT FOR STANDING WATER CAUSED BY VERY HEAVY RAIN..DO NOT ATTEMPT TO CROSS THROUGH STAN)DING WATER IN AREAS UNFAMILIAR TO YOU. ANYONE LIVING NEAR SMALL STREAMS SHOULD KEEP ALERT FOR RISING WATERS AND BE PREPARED TO MOVE TO HIGHER GROUND. BENNETT
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 7:44 PM CDT | Severe Thunderstorm Warning | FGF | Beltrami, Clearwater | 76 min |
| Jul 18, 4:50 PM CDT | Tornado Warning | FGF | Beltrami | 30 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 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.