Alert archive / Colorado / Tornado Warnings in 2015
Tornado Warning 2, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Apr 17, 2015, 5:57 PM MDT for Logan County, Colorado. It was in force for 18 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
- Apr 17, 2015, 5:57 PM MDT (23:57 UTC)
- Expired
- Apr 17, 2015, 6:15 PM MDT
- In force
- 18 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
County Logan County, CO
The radar
The Goodland radar (KGLD), 171 km from the middle of the area, began a volume at 23:55 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 17, 4:37 PM MDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Denver, CO (KDEN), launched 12:00Z, 12.0 hours before the alert went out and 92 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
- 603 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 205 m²/s²
- 0-3 km storm-relative helicity
- 227 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
092
WFUS55 KBOU 172357
TORBOU
COC075-180015-
/O.NEW.KBOU.TO.W.0002.150417T2357Z-150418T0015Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
557 PM MDT FRI APR 17 2015
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* TORNADO WARNING FOR...
EAST CENTRAL LOGAN COUNTY IN NORTHEASTERN COLORADO...
* UNTIL 615 PM MDT
* AT 557 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
TORNADO WAS LOCATED NEAR FLEMING...OR 21 MILES EAST OF STERLING...
MOVING NORTHWEST AT 10 MPH.
HAZARD...TORNADO.
SOURCE...RADAR INDICATED ROTATION.
IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS AND VEHICLES.
* LOCATIONS IMPACTED INCLUDE...
FLEMING AND ST PETERSBURG.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE IN A MOBILE
HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.
&&
LAT...LON 4055 10283 4072 10296 4077 10282 4061 10269
TIME...MOT...LOC 2357Z 147DEG 10KT 4067 10281
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
RPK2 follow-up statements
408
WWUS55 KBOU 180003
SVSBOU
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
603 PM MDT FRI APR 17 2015
COC075-180015-
/O.CON.KBOU.TO.W.0002.000000T0000Z-150418T0015Z/
LOGAN CO-
603 PM MDT FRI APR 17 2015
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM MDT FOR EAST
CENTRAL LOGAN COUNTY...
AT 603 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED OVER FLEMING...OR 20 MILES EAST OF STERLING...MOVING
NORTHWEST AT 10 MPH.
HAZARD...TORNADO.
SOURCE...RADAR INDICATED ROTATION.
IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS AND VEHICLES.
LOCATIONS IMPACTED INCLUDE...
FLEMING AND ST PETERSBURG.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A
VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND
PROTECT YOURSELF FROM FLYING DEBRIS.
&&
LAT...LON 4055 10283 4072 10296 4077 10282 4061 10269
TIME...MOT...LOC 0003Z 147DEG 10KT 4068 10282
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
RPK069
WWUS55 KBOU 180013
SVSBOU
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
613 PM MDT FRI APR 17 2015
COC075-180023-
/O.EXP.KBOU.TO.W.0002.000000T0000Z-150418T0015Z/
LOGAN CO-
613 PM MDT FRI APR 17 2015
...THE TORNADO WARNING FOR EAST CENTRAL LOGAN COUNTY WILL EXPIRE AT
615 PM MDT...
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER APPEARS CAPABLE OF PRODUCING A TORNADO.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE. HOWEVER SMALL HAIL
AND GUSTY WINDS ARE STILL POSSIBLE WITH THIS THUNDERSTORM.
A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT MDT FOR NORTHEASTERN
COLORADO.
LAT...LON 4055 10283 4072 10296 4077 10282 4061 10269
TIME...MOT...LOC 0009Z 147DEG 10KT 4068 10282
$$
RPKThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 17, 4:27 PM MDT | Tornado Warning | BOU | Washington | 18 min |
| Apr 17, 4:52 PM MDT | Special Weather Statement | BOU | Morgan | 23 min |
| Apr 17, 5:31 PM MDT | Special Weather Statement | BOU | Morgan | 29 min |
Nearby
Tornado Warnings in Colorado, 2015Every tornado warning in 2015Tornadoes in 2015
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.