Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 26, NWS Grand Forks, ND

May 28, 2002Norman County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at May 28, 2002, 3:35 PM CDT for Norman County, Minnesota. It was in force for 25 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 28, 2002, 3:35 PM CDT (20:35 UTC)
Expired
May 28, 2002, 4:00 PM CDT
In force
25 min
Issued by
NWS Grand Forks, ND
Area
Counties, with a storm outline in the text

County Norman County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 69 km from the middle of the area, began a volume at 20:36 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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 nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 8.6 hours before the alert went out and 281 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.

Skew-T log-pSkew-T log-p diagram, International Fa, MN at 12:00Z on 2002-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, International Fa, MN at 12:00Z on 2002-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2041 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS53 KFGF 282035
SVRFAR
MNC107-282100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
334 PM CDT TUE MAY 28 2002

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  SOUTHERN NORMAN COUNTY IN NORTHWEST MINNESOTA.

* UNTIL 400 PM CDT.

* AT 330 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 7 MILES WEST OF BORUP...OR ABOUT 23 MILES NORTH
  OF FARGO...MOVEMENT WAS TO THE EAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...

  ADA AT 340 PM...
  BORUP AT 345 PM AND
  SYRE AT 400 PM.

REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

LAT...LON 4729 9674 4717 9678 4716 9622 4729 9607


06

NNNN

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.

NWS Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at May 28, 2:50 PM CDT, 45 minutes earlier.

Area forecast discussion, May 28, 2:50 PM CDT, 45 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
250 PM CDT TUE MAY 28 2002

FORECAST CHALLENGE CONCERNS EARLY PCPN CHANCES AND TEMPERATURES.

MODELS IN REASONABLE AGREEMENT WITH OVERALL PATTERN THROUGH PERIOD.
IN THE EARLY GOING PREFERRED THE AVN SFC FEATURES HOWEVER AVN NOT
PICKING UP VERY WELL ON SECONDARY SHORT WAVE DROPPING THROUGH
SASKACHEWAN WHICH THE ETA COVERED SO WILL USE MIX FOR GRIDS.

SCATTERED CONVECTION CONTINUES AHEAD SW-NE BOUNDARY OVER EASTERN ND
INTO N CENTRAL MN. CU BAND HAS RECENTLY BEEN BACKBUILDING THROUGH SE
ND ALONG THIS BOUNDARY. AM ALSO SEEING DEVELOPING CU FIELD LIKELY AS
A RESULT OF OUTFLOW FROM CONVECTION FARTHER SOUTH FROM EXTREME SE ND
INTO WEST CENTRAL MN. POSSIBILITY EXISTS FOR THESE BOUNDARIES TO
INTERACT LATER THIS AFTERNOON AS THIS AREA HAS SEEN NEARLY FULL
SOLAR ALL DAY. ALTHOUGH DEEP MOISTURE LACKING WITH CURRENT
INSTABILITY AND EXPECTED CAPE AND APPROACHING SECONDARY WAVE OVER
SOUTHEAST SASK FEEL ADDITIONAL DEVELOPMENT POSSIBLE. AS A RESULT
WILL MAINTAIN CHC OF EVENING TSRA OVER ALL BUT FAR NW PTN.AFTER
EVENING CHANCES OF TSRA FROM VALLY EAST WITH PASSAGE OF MID LEVEL
WAVE SHORT WAVE RIDGE SHIFTS ACROSS FORECAST AREA. COLUMN SHOWING
GOOD DRYING FROM WEST TO EAST. 850MB THERMAL RIDGE REMAINS TO OUR
WEST SO WITH WARM ADVECTION CONTINUING EXPECT MILD MINIMUM
TEMPERATURES.

MORE POTENT WAVE TO AFFECT FORECAST AREA MAINLY DURING AFTERNOON
EVENING HOURS. NOSE OF UPPER JET REACHES MAINLY NORTHERN FA LATE IN
DAY. ASSOCIATED SURFACE BOUNDARY ALSO MORE WELL DEFINED. PRECIPITBLE
WATER IN EXCESS OF AN INCH AND WITH OTHER CONVECTIVE PARAMETERS WILL
SEE SIMILAR RESULTS AS TODAY. THERMAL RIDGE SHIFTS OVER FORECAST
AREA AND CLOUDS WILL HAVE A SIGNIFICANT AFFECT ON TEMPERATURES. WILL
STAY CONSISTENT AND LEAN TOWARDS WARMER FWC/ETA GUIDANCE.

TROUGH PUSHES EAST OVERNIGHT AND WILL MAINTAIN EVENING MENTION OF
TSRA. NO REAL COOLING SO MILD TEMPS AGAIN OVERNIGHT.

REMAINDER OF WORK WEEK LOOKS RELATIVELY RAINFREE AS COLUMN DRIES AND
SFC HIGH WORKS EAST. SLIGHT COOLING IN THE LOWER LEVELS SHOULD
RESULT IN TEMPERATURES MORE TOWARDS SEASONAL AVERAGES FRIDAY.

.EXTENDED...
UTILIZED 12Z AVN THRU 168HRS AS BASIS OF FCST. WEAK HIGH PRESSURE
WILL BE OVER EXITING AREA ON SATURDAY...AHEAD OF NEXT SYSTEM WHICH
APPEARS WILL ARRIVE A BIT FASTER THAN EARLIER THINKING IN FAST
WESTERLY FLOW. WILL INTRODUCE CHC SHRA ON SUNDAY AND CONTINUE IT
INTO MONDAY.  MRF AND AVN TIMING OFF SOMEWHAT...WITH MRF SHOWING
NEXT SYSTEM FAST ON HITS HEELS ON TUESDAY WHILE AVN SLOWER AND LESS
AMPLIFIED.  ATTM WILL LEAVE TUESDAY AS JUST MOSTLY CLOUDY.  85H
TEMPS SUGGEST NEAR NORMAL TEMPERATURES AND THIS COVERED WELL IN PREV
EXTENDED.

.FGF...NONE.

VOELKER/RIDDLE

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 28, 6:40 PM CDTSevere Thunderstorm WarningFGFOtter Tail, Wilkin40 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2002Every severe thunderstorm warning in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.